If we're interested in knowing the rate at which light energy is received by a unit of area on a particular surface, we're really trying to figure out the
A. incandescence.
B. luminous flux.
C. illuminance of a surface.
D. luminous intensity.

Answer:

The correct answer is option C

Explanation:

We have the equation of motion, [tex]v^2=u^2+2as[/tex], where v is the final velocity, u is the initial velocity, a is the acceleration and s is the displacement.

Here initial velocity = 15 m/s

  Displacement = 10 m

  Acceleration = acceleration due to gravity = 9.8 m/s²

Substituting to get final velocity,

  [tex]v^2=u^2+2as\\ \\ \\v^2=15^2+2*9.8*10\\ \\ v=20.52m/s[/tex]

So the correct answer is option C

In Physics, the magnitude of the velocity of a coin thrown downward from a building can be calculated using the equation of motion. Here, the initial velocity of the coin is added to the effect of gravity. The final downward speed after falling 10.0 m is approximately 20.5 m/s.

The subject here is Physics, more specifically, mechanics relating to motion under gravity. It's important to know that when an object is dropped, it accelerates due to gravity. The standard rate due to Earth's gravity is 9.8 m/s^2. However, in this case, the coin is thrown downward (i.e., in the direction of gravity), which means we must add this initial speed to gravity's influence.

The magnitude of velocity is calculated using this equation: final velocity = initial velocity + acceleration due to gravity * time. But you have an issue here. You don't have the time. Instead, you have the distance fallen. We need to use the second equation of motion: final velocity^2 = initial velocity^2 + 2*acceleration*distance. Substituting the given values: final velocity^2 = (15 m/s)^2 + 2*9.8 m/s^2 * 10.0 m = 225 m^2/s^2 + 196 m^2/s^2. The square root of the sum gives us the final velocity which is approximately 20.5 m/s, as velocity is a scalar quantity, we take the magnitude, so we get 20.5 m/s

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Answer: molecule

Explanation:

Covalent bond is the type of bond formed when there is sharing of electrons between two similar or different atoms.

1. Proton is the subatomic particle of an atom which is present in the nucleus of atom and bears positive charge.

2. Ions are formed when there is a loss or gain of electrons in an atom.

3. An atom is smallest unit of a matter or substance.It consist of three subatomic particles : electrons, protons, neutrons.

4. Molecules of element is a pure substance which is formed by bonding of atoms of similar elements. Example: [tex]H_2[/tex] .Molecule of compound is a pure substance which is formed by bonding of atoms of different elements combined together in a fixed ratio by mass.  Example: [tex]H_2O[/tex]

Photons of different kinds of light carry different amounts of energy

einstein's photoelectric equation (and nobel prize citation)

Answer:

Photons of different kinds of light carry different amounts of energy.

Explanation:

As per Einstein's Theory of photoelectric effect we know that

[tex]h\nu = \phi + KE[/tex]

here we know that

[tex]\phi [/tex]= work function of the metal

KE = kinetic energy of ejected electron

[tex]\nu[/tex] = frequency of incident photon.

Now we know that photons of different frequency will have different amount of energy due to which the electrons get ejected out of the surface.

So if the photons have small energy or lesser energy then in that case the electron cannot ejected out

So threshold frequency is the minimum frequency at which electrons ejected out.

This is because heat energy is released when the solute dissolves in solution. Increasing temperature introduces more heat into the system. ... This increase in kinetic energy allows greater movement in the gas particles resulting in the intermolecular bonds between the gas solute and solvent being broken.

Answer:D

Explanation:

(a) Tangential acceleration: [tex]9.5 m/s^2[/tex]

The tangential acceleration is given by:

[tex]a_t = \frac{v-u}{t}[/tex]

where

v = 23 m/s is the final velocity of the car

u = 4 m/s is the initial velocity of the car

t = 2 s is the time taken for the car to accelerate from u to v

Substituting the numbers into the formula, we find

[tex]a_t = \frac{23 m/s-4 m/s}{2 s}=9.5 m/s^2[/tex]

(b) Radial acceleration: [tex]0.49 m/s^2[/tex]

The radial acceleration is equivalent to the centripetal acceleration, which is given by:

[tex]a_r = \frac{v^2}{r}[/tex]

where

v = 16 m/s is the tangential speed

r = 527 m is the radius of the circular orbit

Substituting numbers, we find

[tex]a_r = \frac{(16 m/s)^2}{527 m}=0.49 m/s^2[/tex]

Answer:

[tex]48 \Omega[/tex]

Explanation:

The resistance of the resistor can be calculated by using Ohm's law:

[tex]V=RI[/tex]

where

V is potential difference across the resistor

I is the current through the resistor

R is the resistance

In this problem, we have

[tex]V=12 V[/tex]

[tex]I=0.25 A[/tex]

So we can re-arrange Ohm's law to calculate the value of the resistance of the resistor:

[tex]R=\frac{V}{I}=\frac{12 V}{0.25 A}=48 \Omega[/tex]

3.

a)

r = distance of each mass in each hand from center = 0.6 m

m = mass of each mass in each hand = 2 kg

v = linear speed = 1.1 m/s

L = combined angular momentum of the masses = ?

Combined angular momentum of the masses is given as

L = 2 m v r

L = 2 (2) (1.1) (0.6)

L = 2.64 kg m²/s

b)

v' = linear speed when she pulls her arms = ?

r' = distance of each mass from center after she pulls her arms = 0.15 m

Using conservation of momentum , angular momentum remains same, hence

L = 2 m v' r'

2.64 = 2 (2) (0.15) v'

v' = 4.4 m/s

If force = mass x acceleration, and you're walking down the street one day and you see a 20kg rock that is accelerating at 20 m/s², then you can say to yourself:

"Self !  That rock has 20 kg of mass and it's accelerating at 20 m/s², and since force = mass x acceleration, the net force acting on the rock must be (20kg) x (20 m/s²) which is 400 Newtons.  How strange that 400 N is not one of choices under the question!"

Use the formula for energy stored between the plates of a capacitor:

[tex]E = \frac{1}{2}QU=\frac{1}{2}7.6\cdot 10^{-11}C\cdot 5.8V= 2.2\cdot 10^{-10}J[/tex]

where Q is he charge (given) and U is the electric potential (aka voltage), given.

The stored energy is 2.2 10^{-10} Joules.

Final answer:

The speed of a wave with a wavelength of 10 mm and a frequency of 5.0 Hz is calculated by the formula v = f λ. Multiplying the frequency (5.0 Hz) by the wavelength (10 mm or 0.01 m) results in a wave speed of 0.05 m/s.

Explanation:

The speed of a wave can be found by multiplying its frequency (f) by its wavelength (λ). This relationship is given by the equation v = f λ, where v is the speed of the wave, f is the frequency, and λ is the wavelength.

Using the given details for the student's question, with a wavelength of 10 mm (which is 0.01 meters) and a frequency of 5.0 Hz, the speed v of the wave is calculated as follows:

v = f × λ

v = 5.0 Hz × 0.01 m

v = 0.05 m/s

Therefore, the speed of the wave is 0.05 meters per second (m/s).

The tendency of a moving object to continue moving in a straight line or a stationary object to remain in place is called inertia.

According to law of inertia, an object maintains its state of rest or motion unless acted upon by an external force. an object can not move on its own unless force is applied on it to move it. also an object can not come to stop on its own unless acted upon by an external force to stop it.This is also known as newton's first law.

Answer:

The answer is A, a solar eclipse.

Explanation:

Answer:

B) 200 Newtons

Explanation:

We have two forces acting on the object:

- Fgrav = 600 N: this is the force of gravity, which is equal to the weight of the object, which pushes downward

- Fair = 400 N: this is the force due to the air resistance, which is against the direction of motion of the object, so for an object in free fall, its direction is upward

Therefore, we have two forces acting in opposite directions: therefore, the net force is equal to the difference between the two forces:

[tex]F_{net}=F_{grav}-F_{air}=600 N-400 N=200 N[/tex]

the answer is C because 10^-3=1/1000 times 2.5=0.0025

The number that represents the standard form given, 2.5x10⁻³, is 0.0025. That is 0.0025 the same as 2.5x10⁻³. Option C is correct.

Standard form can refer to different concepts depending on the context.

Standard Form of a Number:

In mathematics, the standard form of a number refers to a specific way of representing a number using digits and place value. In standard form, also known as scientific notation, a number is expressed as a product of a coefficient (a decimal number greater than or equal to 1 and less than 10) and a power of 10.

For example:

- The number 3,450,000 in standard form is written as 3.45 × 10^6.

- The number 0.0000625 in standard form is written as 6.25 × 10^-5.

Learn more about standard form here:

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Given that,

Initial velocity , Vi = 0

Final velocity , Vf = 40 m/s

Acceleration due to gravity , a = 9.81 m/s²

Distance can be calculated as,

2as = Vf² - Vi²

2 * 9.81 *s = 40² - 0²

s = 81.55 m

For half height, that is, s = 40.77m

Vf= ??

2as = Vf² - Vi²

2 * 9.81 * 40.77 = Vf² - 0²

Vf² = 800

Vf = 28.28 m/s

Therefore, speed of roller coaster when height is half of its starting point will be 28 m/s.  

Answer : The correct option is, X : radius  and  Y : tangential speed

Explanation :

Centripetal force : It is defined as a force which acts on the object to keep the object moving along a circular path.

Formula for centripetal force :

[tex]F_c=\frac{m\times V^2}{r}[/tex]

where,

[tex]F_c[/tex] = centripetal force

m = mass

r = radius

V = tangential speed

The quantity belong in cell X is radius and in the cell Y is tangential speed

Hence, the correct option is, X : radius  and  Y : tangential speed

An action-reaction pair shows the direct relationship two objects have directly on each other.  Therefore, the correct answer is C. The Moons gravity pulls on you, and your gravity pulls on the Moon because it is moon gravity-person person gravity-moon.

Choice A would be made correct if it was you pull on a drawer and the drawer pushes on you OR the table pushes on the ground and the ground pushes on the table.

Choice B would be made correct if it was a computer sits on a table and the table pushes up on the computer.

Choice D would be made correct if it was an eraser sits on a shelf and the shelf pushes up on the eraser OR the wall pushes on the shelf and the shelf pushes against the wall.

Hope this helps!!

B. Energy to be stored

Question 1:

d = distance the bowling ball has fallen = ?

g = acceleration due to gravity acting on the ball by earth = 9.8 m/s²

t = time of fall for the ball = 3.0 s

distance the ball has fallen is given as

d = (0.5) g t²

inserting the above values in the equation above

d = (0.5) (9.8 m/s²) (3.0 s)²

d = (0.5) (9.8 m/s²) (9.0 s²)

d = (4.9 m/s²) (9.0 s²)

d = 44.1 m

Question 2 :

m = mass of the lunch box pushed = 3 kg

a = acceleration of the lunch box = 2 m/s²

F = net force acting on the lunch box

as per newton's second law , net force is given as

F = ma

F = 3 x 2

F = 6 N

Question 3 :

m = mass of rock = 10 kg

g = acceleration due to gravity = 9.8 m/s²

W = weight of the rock

weight of rock is given as

W = mg

W = 10 x 9.8

W = 98 N

The actual answer is B) Chlorine

According to the Bohr Model diagram, the atom has seventeen electrons. This makes it Chlorine.

Sorry if i'm late!!

Answer:

B)

Explanation:

Usatestprep

is this a true of false cuz if so this it true

Work = (force) x (distance)

Work = (21 Newtons) x (9 meters) = 189 Joules

Power = (work done) / (time to do the work)

Power = (189 Joules) / (3 sec)

Power = (63 watts/sec)

Power = 63 watts  (D)

T = half life period of decay for atoms of element A = 20,000 years

N₀ = initial number of atoms of element A = 10,000 atoms

N = final number of atoms after time "t" = 2500 atoms

t = time of decay = ?

λ = decay constant = ?

decay constant is given as

λ = 0.693/T

λ = 0.693/20,000

λ = 0.00003465 years⁻¹

atoms after decay for time "t" is given as

N = N₀ [tex]e^{-\lambda t}[/tex]

inserting the values

2500 = (10000) [tex]e^{-(0.00003465) t}[/tex]

t = 40,000 years

so correct choice is

B) 40,000 years

Answer:

B) 40,000 years

Explanation:

You would have only 2500 of A left after 40,000 years. This represents 2 half-lives. After 20,000, ther would be 5,000 of A left and after another 20,000, it would be reduced to 2,500.

Electrons are transferred from one atom to another describes ionic bonding.

Option D

Explanation:

Ionic bonding requires at least one acceptor and one donor. ''Ionic bond'' is the movement of ''valence electrons'' between atoms. It gives two oppositely charged ions after taking place. The metal loses electrons and form a positive cation, and non metals gains electrons to become negative cations. Thus electron donor is a metal, and electron acceptor is usually a non metal. Thus, it is evident that in ionic bonding electrons are transferred between atoms.

v=vo-at<=>0=20-4a<=>4a=20=>a=5 m/s^2

Answer:

C.490N

Explanation:

The plane experiences an acceleration of 1.83 m/s². Using the formula for acceleration, the displacement of the plane during this time is found to be 1363.92 m north.

To determine the displacement of a plane with uniform acceleration, we must first figure out the rate of acceleration. Acceleration is defined as the change in velocity divided by the time it takes for this change to occur. In this case the change in velocity (final velocity - initial velocity) is 88 m/s - 66 m/s = 22 m/s. This acceleration occurs over a period of 12 seconds, so the rate of acceleration is 22 m/s / 12 s = 1.83 m/s².

Now, with the rate of acceleration determined, the displacement of the plane can be calculated using the equation for acceleration d = vi*t + 0.5*a*t², where 'd' is displacement, 'vi' is initial velocity, 'a' is acceleration, and 't' is the time. After substituting the given values we get the answer as 66m/s * 12s + 0.5 * 1.83 m/s² * (12s)² = 1363.92 m. So the displacement of the plane during this period is 1363.92 m north.

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Final answer:

In the U.S., a more appropriate distance for business conversations is maintaining an arm's length of space between each other when talking face to face.

Explanation:

In the U.S., a more appropriate distance for business conversations is maintaining an arm's length of space between each other when talking face to face. This means standing approximately 3-4 feet away from the person you are conversing with.

Standing 2 feet away from coworkers may be considered too close and can make them uncomfortable. It's important to pay attention to cues from coworkers, and if they seem uncomfortable, it's best to adjust your distance accordingly. Remember that personal space preferences can vary among individuals, but generally, maintaining an arm's length of space is a good guideline to follow in the U.S.

KE depends on velocity. It is easier to answer this question in terms of the earth.

The closer the object (earth/comet) is to the sun, the faster it moves. that means that the fastest moving point would be as the comet/earth passes through point C.

The slowest speed would be the furthest away from the sun which is point A.

Answer: The faster the planet moves the greater the Kinetic Energy.

The Slower the planet moves, the less the KE.

Point A is where it is slowest with the lowest amount of energy.

Discussion

The formula for KE is KE = 1/2mv^2. The mass of the comet or earth is a constant. It doesn't change no matter which point the comet passes through. If v goes down KE will go down. If v goes up, KE goes up.

You posted the same picture yesterday, and learned that ‘C’ is the point of the MOST kinetic energy because it’s closest to the sun and moving fastest. Then I suggested that you review Kepler’s 2nd law.

From that answer OR from Kepler, it should be clear that the LEAST kinetic energy is at ‘A’ .

The correct answer is A.

Quizlet is always my trusty sidekick!

I hope this helps!

Cheers, July.