A 1500-W heater is connected to a 120-V line for 2.0 hours. How much heat energy is produced?

Answers

Answer 1
A joule is equal to one watt per second and so we must find out how many seconds are in two hours. A shortcut you can use is remove the zeros and multiplying the remaining numbers before adding the the zeros back to the total of your result 6 x 6 x 2 = 72 and thus 60 x 60 x 2 = 7200 72 x 15 = 1080 and thus 7200 x 1500 = 10800000 joules one mega joule equals one million joules So we can simplify things and say 10.8 MJ

Related Questions

A mass oscillates on the end of a spring, both on earth and on the moon. where is the period the greatest?

Answers

Draw a diagram to illustrate the problem as shown below.
m =  mass of the object
x =  displacement
k =  spring constant
g =  acceleration due to gravity.

The driving force of mg (weight) is opposed by the spring restoring force
of -kx.
The equation of motion is
mg - kx = m x''
or
x'' + (k/m) = g

For oscillatory motion, the homogeneous solution of the ODE yields
ω² = 2π/T = k/m
where
T = period of oscillation
ω = circular frequency

The period is T = 2π√(m/k)

Answer:
Th period is independent of g, therefore the period will be the same on earth and the moon.


Final answer:

The period of oscillation of a mass on a spring is the same on both Earth and the Moon, as it is independent of gravity.

Explanation:

The question asks where the period of oscillation of a mass on a spring is the greatest, either on Earth or on the Moon. The period of a spring-mass system, according to the formula T = 2π√(m/k), where T is the period, m is the mass, k is the spring constant, and π (pi) is approximately 3.14159, is independent of gravity. Hence, the gravitational differences between the Earth and the Moon do not affect the period directly. However, external forces like gravity can influence the amplitude of the oscillation, not the period itself. Therefore, the period of oscillation will be the same on both the Earth and the Moon, assuming no other factors are changed.

A charge Q generates an electric field of strength E at a distance d away. Determine the electric field strength at d and 2d, respectively:

Answers

Final answer:

The electric field strength at a distance 2d from a charge Q is one-fourth the electric field strength at a distance d, due to the inverse square nature of the electric field with respect to distance.

Explanation:

The question pertains to the concept of the electric field created by point charges in physics. To determine the electric field strength E at a distance d and at a distance 2d from a charge Q, we use Coulomb's law, which relates the electric field E to the charge Q and the distance r from the charge as E = kQ/r², where k is Coulomb's constant (approximately 8.99 × 10⁹ Nm²/C²).

For the charge Q generating a field strength E at a distance d, the electric field at distance d is simply E. However, at a distance 2d, since the distance from the charge is doubled, the electric field strength is reduced by a factor of four (since it's inversely proportional to the square of the distance). Therefore, the electric field strength at 2d is E/4.

Example Calculation: If the original distance is 2.00 × 10⁻² m and charge is 5.00 × 10⁻¹ C, the electric field at distance d can be calculated using the formula provided. If E is known initially at distance d, to find the field at 2d, simply divide that E by 4.

Final answer:

The electric field strength at a distance 2d from a charge Q is one-fourth the electric field strength at a distance d, according to the equation E = kQ/r², where E is electric field strength, k is Coulomb's constant, Q is the charge, and r is the distance.

Explanation:

The question deals with determining the electric field strength at distances d and 2d from a charge Q. The electric field strength created by a point charge is given by the equation E = kQ/r², where k is Coulomb's constant, Q is the charge, and r is the distance from the charge.

At a distance d, the electric field strength is E. To find the electric field strength at 2d, we simply plug in the new distance into the equation, which results in E = kQ/(2d)². Because 2d is simply twice the original distance, the denominator becomes four times as large, resulting in an electric field strength at 2d that is ¼ of what it was at d. Therefore, the electric field strength at 2d will be E/4.

Is grass abiotic or biotic

Answers

Grass would be biotic. Its a living thing.
biotic Hope this helps:)

If a road does not have a bicycle lane, where must a bicyclist ride their bicycle?

Answers

A bicyclist can ride their bicycle still on the road. Bicycle riders be able to take the public ways which has the similar rights and accountability as motorists and are subject to the same guidelines and protocols. The law says that individuals who ride bikes should ride as nearby to the right side of the road as likely excluding under the following conditions: when passing, preparing for a left go, evading risks, if the lane is too constricted to share, or if oncoming a place where a right turn is approved. In a road which has a bike lane the bicyclists roving slower than road traffic must custom the bike way excluding when creating a left turn, passing, evading hazardous settings, or impending a place where a right turn is approved. 

Mikes car can accelerate from 0 mph to 40mph in 5 seconds what is the acceeration of his car in miles per hour per second

Answers

40/5=8. His speed increases 8mph/second :)

Your friend just challenged you to a race through an obstacle course. You know in order to beat him, you must run 30 meters within 60 seconds in a southern direction. What does your average velocity need to be to win the race?

Answers

.5 meters per seconds.

Answer:

velocity = 0.5 m/s Towards South

Explanation:

As we know that velocity is the ratio of displacement and time

so here it is given that object displaced by total displacement of d = 30 m

also we know that time taken is 60 seconds

now we know the formula as

[tex]v = \frac{displacement}{time}[/tex]

now plug in the values in it

[tex]v = \frac{30}{60}[/tex]

[tex]v = 0.5 m/s[/tex] Towards South

So the average velocity must be 0.5 m/s Towards South

where do the three rays in a ray diagram start

Answers

at a single point on the object
Final answer:

In a ray diagram, the three rays usually originate from the same point on the object. Following predefined ray-tracing rules, these rays pass through or reflect off a lens or mirror, converging or diverging to form an image. The point where these rays intersect represents the location of the image.

Explanation:

In a ray diagram, the three rays typically start from the same point on the object. This point on the object is the source from which the rays emanate. As the rays travel towards the lens or mirror involved, they will follow particular paths based on a set of simple ray-tracing rules. For example, one ray might pass through the focal point on its way to the lens and exit the lens parallel to the optical axis. These rays will then converge or diverge to form an image, depending on the lens or mirror set-up.

It is important to note that although three rays are often drawn for clarity and verification, only two are necessary to locate a point in the image. The point at which these rays intersect on the other side of the lens or mirror is where the image of the point from which they originated is located. Following these ray-tracing rules correctly will provide an accurate representation of how light behaves in the given optical system, illustrating the fundamental principles of geometric optics.

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A scientific _______ is a unifying explanation for a set of observations that has been verified by multiple testing. hypothesis belief law theory

Answers

Theory is the answer. Hope this helps.
A scientific THEORY is a unifying explanation for a set of observations that has been verified by multiple testing. hypothesis belief law theory

The elements required for a fire to start are

Answers

Heat, Fuel, and Oxidizing agent
The elements required for a fire to start are oxidizing agent, heat, and fuel.
The oxidizing agent is usually oxygen - when there is a lot of air, of oxygen, a fire can broke out more easily if the conditions are right - if there is no oxygen, the fire won't start - we put out a fire by depriving it of oxygen. Next, you need some heat and fuel to start a fire, which can all be seen in this triangle. 

Which of the answer choices correctly describes covalent bonds?

A) An attraction between oppositely charged ions
B) A force that holds atoms or ions together in a fixed structure or unit
C) A sharing of four pairs (eight valence electrons) between two atoms
D) A sharing of an electrons pair between two atoms

Answers

the answer to your question should be the letter d
D is the correct answer

The number of hours of daylight at any place on earth depends on

Answers

the position that place, and the position of earth.

When jump starting a vehicle, once the stalled vehicle is successfully started, remove the cables in the same order in which they were connected?

Answers

The statement “When you jump start a vehicle, if the stalled vehicle started, then you remove the cables in the same order in which they were connected”, is false.

 




Go through these steps before you even connect the cables:

1.     Both batteries should have the same polarity and same voltage.

2.     Never let the vehicles touch each other and your cars should be near enough to connect the cables.

3.     Turn off the lights, accessories, and ignition switch in both cars. Put the vehicles in neutral mode and make sure the parking brake is set. Also wear safety glasses.

4.     Never smoke. An explosion is possible if sparks and ear a battery.

5.     Don’t try to it the battery if the weak battery is frozen because it can explode.

6.     Be sure to be able to identify the positive and negative terminals of both batteries. You need to have enough room to clamp to the cable terminals.

A ray diagram shows that an object is placed between the focal point and the vertex of a convex mirror. What are the characteristics of the image produced by the object? inverted, smaller than object, real upright, smaller than object, virtual inverted, larger than object, real upright, larger than object, virtual

Answers

The correct answer is: smaller than object, virtual and upright.

When the object is placed between the focal point and the vertex of a convex mirror, then the image formed will be located behind the convex mirror. It will be virtual image and an upright image but reduced in size (i.e., smaller than the object)

Answer:

B on EDGE2k21

Explanation:

trust me bih

Baseball player swings and hits a pop fly straight up in the air to the catcher. the height of the baseball in meters t seconds after it is hit is given by the quadratic function h left parenthesis t right parenthesis equals negative 4.9 t squared plus 34.3 t plus 1h(t)=â4.9t2+34.3t+1. how long does it take for the baseball to reach its maximumâ height? what is the maximum height obtained by theâ baseball?

Answers

The height at time t is given by
h(t) = -4.91t² + 34.3t + 1

When the ball reaches maximum height, its derivative, h'(t) = 0.
That is,
-2(4.91)t+34.3 = 0
-9.82t + 34.3 = 0
t = 3.4929 s

Note that h''(t) = -9.82 (negative) which confirms that h will be maximum.

The maximum height is
hmax = -4.91(3.4929)² + 34.3(3.4929) + 1
          = 60.903 m

Answer:
The ball attains maximum height in 3.5 s (nearest tenth).
The ball attains a maximum height of 60.9 m (nearest tenth)

A 5.0 cm object is 6.0 cm from a convex lens, which has a focal length of 7.0 cm.
What is the distance of the image from the lens?

cm
What is the height of the image?

cm

Answers

Answer : The distance of the image from the lens is, -42 cm

The height of the image is, 35 cm

Solution :

First we have to calculate the image distance.

Formula used :

[tex]\frac{1}{f}=\frac{1}{p}+\frac{1}{q}[/tex]

where,

f = focal length = 7 cm

p = object distance = 6 cm

q = image distance = ?

Now put all the given values in the above formula, we get the distance of the image from the lens.

[tex]\frac{1}{7cm}=\frac{1}{6cm}+\frac{1}{q}[/tex]

[tex]q=-42cm[/tex]

Therefore, the distance of the image from the lens is, 42 cm and the negative sign indicates that the image is virtual.

Now we have to calculate the height of the image.

Formula used :

[tex]\frac{h}{h'}=\frac{p}{q}[/tex]

where,

h = height of object = 5 cm

h' = height of image = ?

Now put all the given values in this formula, we get the height of the image.

[tex]\frac{5cm}{h'}=\frac{6cm}{-42cm}=-35cm[/tex]

Therefore, the height of the image is, 35 cm and the negative sign indicates that the image is inverted.

A. The distance of the image from the lens is –42 cm.

B. The height of the image is 35 cm

Data obtained from the question Height of object (Hₒ) = 5 cmObject distance (u) = 6 cmFocal length (f) = 7 cmImage distance (v) =? Height of image (Hᵢ) =?

A. How to determine the image distance

The image distance is defined as the distance of the image from the lens. Thus, it can be obtained as follow:

Object distance (u) = 6 cmFocal length (f) = 7 cmImage distance (v) =?

1/v = 1/u – 1/f (convex lens

v = (uf) / (u –f)

v = (6 × 7) / (6 – 7)

v = 42 / – 1

v = –42 cm

B. How to determine the height of the image.

The height of the image is the height of the image as displayed by the lens. It can be obtained as follow:

Height of object (Hₒ) = 5 cmObject distance (u) = 6 cmFocal length (f) = 7 cmImage distance (v) = –42 cmHeight of image (Hᵢ) =?

v / u = Hᵢ / Hₒ

–42 / 6 = Hᵢ / 5

–7 = Hᵢ / 5

Cross multiply

Hᵢ = –7 × 5

Hᵢ = –35 cm

NOTE: The negative sign indicates that the image is a virtual image.

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A meteoroid is traveling east through the atmosphere at 18.3 km/s while descending at a rate of 11.5 km/s. what is its speed, in km/s?

Answers

Use the Pythagorean theorem to find the magnitude of the resultant, southeast vector. A squared plus B squared equals C squared, right? 

so, (south)^2 + (east)^2 = (southeast)^2 

(11.5)^2 + (18.3)^2 = (resultant)^2 

Resultant = 21.6 km/s
Final answer:

The speed of the meteoroid is calculated by using the Pythagorean theorem and considering its horizontal and vertical speeds as vectors. Plugging in the given values, the meteoroid's speed is approx 21.72 km/s.

Explanation:

To calculate the speed of the meteoroid, we can use the concept of vectors and Pythagorean theorem. The meteoroid has a horizontal speed (eastward movement) and a vertical speed (downward movement). The total speed is the magnitude of the resultant vector. This can be calculated using Pythagorean theorem as follows:

The Pythagorean theorem states that in a right-angled triangle, the square of the hypotenuse is equal to the sum of the squares of the other two sides.

Speed = sqrt[(Horizontal speed)^2 + (Vertical speed)^2]

Plugging in the given values:

Speed = sqrt[(18.3 km/s)^2 + (11.5 km/s)^2]

After calculating, we found that the speed is approx 21.72 km/s.

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A force of 110 N is applied horizontally to the handles of a lawnmower to move it at a speed of 0.80 m/s across a lawn. Find the power used to mow the lawn.

Answers

Final answer:

The power used to mow the lawn, with a force of 110 N applied to move the lawnmower at 0.80 m/s, is calculated using the formula P = F × v and results in 88 Watts.

Explanation:

To calculate the power used to mow the lawn, we use the formula for power, which is the rate of doing work. Power (P) is equal to the work done (W) divided by the time taken (t), or P = W/t. In this case, work done can also be described as the force applied (F) times the distance moved (d) in the direction of the force, but since the problem doesn't provide the distance and only provides the speed at which the lawnmower is moving, we can use another formula for power: P = F × v where v is velocity.

Given that the force (F) is 110 N and the velocity (v) is 0.80 m/s, we can find the power with P = 110 N × 0.80 m/s giving us:

P = 88 Watts.

This is the power used by the person to mow the lawn while applying a constant horizontal force to move the lawnmower at a constant speed.

A 12 n cart is moving on a horizontal surface with a coefficient of kinetic friction of 0.20. what force of friction must be overcome to keep the object moving at a constant velocity?

Answers

We must remember that the total net force equation at constant velocity is:

F – Ff = 0

of

F - µN = 0

Using Newton's 2nd Law of Motion:

F = m a 

Where,

F = net force acting on the body 
m = mass of the body 
a = acceleration of the body 

Since the cart is moving at a constant velocity, then acceleration is zero, hence the working equation simplifies to 

F = net Force = 0 

Therefore, 

F - µN = 0 

where 

µ = coefficient of friction = 0.20 
N = normal force acting on the cart = 12 N 

Therefore, 

F - 0.20(12) = 0 

F = 2.4 N 

Give an example in which a small force exerts a large torque. give another example in which a large force exerts a small torque.

Answers

Since the torque involves the product of force times lever arm, a small force can exert a greater torque than a larger force if the small force has a large enough lever arm.

With a large force exerts a small torque is a gate, hinged in its vertical line (axis). When pushed from a point near to the hinge, a very large amount is needed to open the gate.

Answer:

Explanation:

Torque is defined as the product of force and the perpendicular distance.

If we take a screw driver of small length then we need to apply a large force to open or tighten the screw.

If a screw driver of long arm, then we need to apply small force to open or tighten the screw.

describe an electromagnet and how it is used

Answers

An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. The magnetic field disappears when the current is turned off. Electromagnets usually consist of insulated wire wound into a coil. A current through the wire creates a magnetic field which is concentrated in the hole in the center of the coil. The wire turns are often wound around a magnetic core made from a ferromagnetic or ferrimagnetic material such as iron; the magnetic core concentrates the magnetic flux and makes a more powerful magnet.

The main advantage of an electromagnet over a permanent magnet is that the magnetic field can be quickly changed by controlling the amount of electric current in the winding. However, unlike a permanent magnet that needs no power, an electromagnet requires a continuous supply of current to maintain the magnetic field.

Electromagnets are widely used as components of other electrical devices, such as motors, generators, relays, loudspeakers, hard disks, MRI machines, scientific instruments, and magnetic separation equipment. Electromagnets are also employed in industry for picking up and moving heavy iron objects such as scrap iron and steel.[2]

Electromagnets are temporary magnets powered by electric current with versatile applications in different fields.

**An electromagnet** is a piece of wire that generates a magnetic field when an electric current passes through it. Unlike permanent magnets, **electromagnets** can be turned on and off by controlling the flow of electricity. They are widely used in various applications such as electric motors, generators, MRI machines, and even in scrapyard cranes.

Two spaceships that have different masses but rocket engines of identical force are at rest in space. if they fire their rockets at the same time, which ship will speed up faster

Answers

The ship that will speed up faster if they fire their rockets at the same time is; The one with the lower mass

Rocket Propulsion

We are told that;

There are two spaceships

Each spaceship has different masses

Each spaceship has rocket engines of identical force.

We know that formula for force is;

F = ma

Thus, if force is constant, the higher the mass, the lesser the acceleration and also the lesser the speed. Thus, the lower the mass the faster the speed.

This means the spaceship that will speed up faster will be the one with lesser mass.

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A gasoline engine operates at a temperature of 270°c and exhausts at 180°c. calculate the maximum efficiency of this engine. (note that the celsius scale is used.)

Answers

Given:
Th = 270 °C = 270+273 = 543 K, hot temperature
Tc = 180 °C = 180+273 = 453 K, cold temperature

According to the Carnot theorem, the maximum efficiency achievable by a heat engine between a hot and cold temperature is
η = 1 - Tc/Th
   = 1 - 453/543
   = 0.166 = 17% (approx)

Answer:  17%  (nearest integer)

16.6 is the answer. Not 17.0 do not round.



A child has legs that are each 0.500 m long. What is her maximum walking speed?

A. 2.21 m/s
B. 2.19 m/s
C. 2.6 m/s
D. 5.58 m/s

Answers

If a child has legs of length 0.500m long, to calculate the maximum walking speed, use this formula:
s=√gl
s=walking speed, g=acceleration due to gravity that is 9.8m/s2 and l is the length of legs which is 0.500m
so,
s=√(9.8)(0.500)
s=√4.9
s=2.21m/s 
so  A is the correct option, her maximum walking speed is 2.21 m/s.

Unit 3 quiz / question 10 of 10 question 10 you are operating a pwc. what is most likely to create a blind spot that blocks other boats from seeing you?

Answers

When operating a pwc, passing too closely behind another vessels, most likely will create a blind spot that blocks other boats from seeing you. Headlights can also create a blind spots and prevent others from seeing you. So one has to keep a respectable distance. 
PWC is a personal water craft, also known as water scooter and comically called boater-cycle.

Explain why the mean and standard deviation are not appropriate for particle size distributions

Answers

The mean is the average of the sample data, while standard deviation is the average of the differences of each data to the mean. This could only be valid if there is a normal distribution. This distribution pertains to a bell-shaped frequency graph. However, in particle size distribution, the frequency of the sizes is rarely concentrated on the medium or middle size. It may be skewed to the left or skewed to the right. So, the mean and standard deviation is not a good measure for this type of distribution.

The mean and standard deviation are not appropriate for particle size distributions due to non-normal distributions, irregular particle shapes, discrete measurement methods, and differences in weighting methods that aren't captured by standard parametric statistics like mean and deviation.

The mean and standard deviation are not always appropriate for describing particle size distributions because particle sizes are often not normally distributed. In the case of particle size distribution, there can be significant skewness or a high level of kurtosis, leading to a distribution that significantly deviates from normality. Additionally, particles may be irregularly shaped, which affects how their size is represented and measured. When particle size is based on sieves, the analysis becomes discrete rather than continuous, which can limit the utility of standard deviation. Furthermore, different weighting methods, like number weighted distribution or intensity weighted distribution, significantly affect the representation of particle size, which the mean and standard deviation do not properly account for.

Moreover, in dynamic light scattering (DLS) methods, the assumption is made that particles are spherical and the distribution is monomodal, which might not hold true for all particle systems. Since the mass of a particle is proportional to the cube of its radius, if particles are crushed to become smaller, a sample with the same number of particles represents a significantly different mass, affecting the representativeness of mean and standard deviation.

Particle shape also influences the determination of size as particles often deviate from sphericity. The equivalent spherical diameter (ESD) used in dynamic measurements may vary, reflecting a limitation for standard mean and deviation metrics. Due to these complexities, particle size distributions are often better described using median particle sizes (such as D50) and span, a dimensionless number that provides insight into the width of size distribution.

A steel cylinder with a moveable piston on top is filled with helium (He) gas. The force that the piston exerts on the gas is constant, but the volume inside the cylinder doubles, pushing the piston up. Which of the following answers correctly states the cause for the change described in the scenario? The temperature increased. The density of the helium atoms decreased. The pressure decreased. The helium atoms increased in size.

Answers

Assuming that Helium behaves as an ideal gas, that means that the Helium molecules have no intermolecular forces. They move freely without depending on one another's energy. We can use the ideal gas equation:

PV = nRT, where

P = pressure
V = volume
n=number of moles of gas
R = gas constant equal to 8.314 J/mol-K
T = absolute temperature

If pressure is kept constant, and we assume that the system is closed such that no moles are added or escaped, then the equation becomes

P/nR = T/V = k, where the k denotes constant. Therefore,

T = kV

So, when the volume doubles, the only reason for this is the increase also of temperature. This is because temperature is directly proportional to the volume of the gas. The answer is: The temperature increased. 

An object floats on water with 80% of its volume below the surface. the same object when placed in another liquid floats on that liquid with 72% of its volume below the surface. determine the density of the unknown fluid.

Answers

0.9g/cm cubed, this is my full answer however i have to write at least 20 characters so this is filler :)

a ball is tossed int the air and rises to a height of 12m. How long is the ball in the air?

Answers

1.5 seconds that its in the air
it'll be 1.5 seconds in the air. Or less

The main purpose of a service panel in a house is to A. keep the meter working correctly. B. connect the service drop to the house. C. provide automatic circuit protection and prevent fires. D. keep electrical hazards localized.

Answers

I think the best answer would be the last option. The main purpose of a service panel in a house is to keep electrical hazards localized. Service panels are used to identify circuit loads and isolate these loads so when  you want to check the equipment you can easily identify the line. Also, it would serve as the isolation point to avoid any electrical hazards.

keep electrical hazards localized

If air resistance can be neglected, how does the acceleration of a ball that has been tossed straight upward compare with its acceleration if simply dropped?

Answers

They are the same. If this is all happening on Earth, then the ball's acceleration is 9.8 m/s^2 in either case. That's the acceleration of gravity around here.

If air resistance can be neglected, the acceleration will be the same for both the thrown ball and dropped ball which is 9.8 m/s² as only gravity is working on it.

What is air resistance?

Air resistance can be defined as a force that is caused by air. The air strikes the front of an object, leading to decelerating its motion. The lesser the face area of a body, the lesser air striking the body, and the lesser the overall air resistance.

Air resistance opposes motion that occurs between air and another object. The object can exploit as it passes through the air because of air resistance. Gravity and air resistance are the only two forces of nature that shift on anything on Earth.

Air resistance force exerts in the opposite direction to an object moving in the air. Air resistance is a frictional force so the faster the body’s motion, the more will be air resistance.

In the absence of air resistance, only force due to gravity will act on an object and the gravitational acceleration will be the same for both upward and downward directions.

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