A car travelling 95 km/h is 210 behind a truck travelling 75 km/h. how long will it take the care to reach the truck

Answer:

It is larger than the second star.

It is younger than the second star.

Explanation:

The star's actual brightness depends on two factors: size and surface temperature. If we take two stars of the same size, hotter star would look brighter. If we take two stars with the same surface temperature, bigger star would like brighter.

In the given scenario, two options can be correct. The first star might be larger than the second one or it can be younger as younger stars are hotter.

Answer:

Mutt have to apply twice the larger force than applied by Jeff

Explanation:

Since Mutt and Jeff want to reach the destination at same time

As given that wagon carried by Mutt is twice heavy than wagon of Jeff

Now to reach the destination both of the wagon must be pulled with same acceleration so that both wagon can cover equal distance in equal interval of time

Now we know that

[tex]F = ma[/tex]

since mass of wagon carried by Mutt is twice heavy than wagon of Jeff so here the force applied by Mutt must be twice larger than the force applied by Jeff.

Answer:

Mutt must use twice as much force to push his cart.

Explanation:

yw.

Final answer:

The swimmer's speed in still water is determined by dividing the river width (200 m) by the total swimming time (400 s), which gives a speed of 0.5 m/s.

Explanation:

The question involves calculating the speed at which a swimmer can swim in still water. The swimmer crosses a 200 m wide river and is swept downstream 480 m, reaching the opposite bank in 6 minutes and 40 seconds. To determine the speed in still water, we'll need to consider two components of the swimmer's velocity: one perpendicular to the river's flow (the swimmer's own speed in still water) and one parallel to the flow (the river's current).

Let v be the speed of the swimmer in still water (m/s) and u be the speed of the river current (m/s). The swimmer's downstream displacement due to the current is 480 m, which is equivalent to u × t, where t is the total swimming time. The total time taken is 400 seconds (6 min 40 s).

The perpendicular component of the swimmer's motion relative to the river banks is 200 m, which should be equal to v × t. From this, we can solve for v by dividing the river width by the total swimming time:

v = 200 m / 400 s = 0.5 m/s

Thus, the swimmer's speed in still water is 0.5 m/s.

Answer:

A. Each is independent of the other.

Hope this helps!

Explanation:

The vertical velocity of a projectile is unaffected by the horizontal velocity; these two components of motion are independent of each other.

The correct answer is D.

Answer:

FURNACE & BOILER

Explanation:

The terms "furnace" and "boiler" relate to one another because they are both forms of central heating. A boiler uses hot water to heat a home, and a furnace uses warm air.

The woman is 282.84 kilometers far from her starting point. The distance is calculated from the given values that women travel.

Given:

The distance covered in the north direction = 300 km

The distance covered in the west direction = 200 km

The distance covered in the south direction = 500 km

The net displacement between the south and north points are:

Distance from the South direction - Distance from the North direction

D = 500 - 300

D = 200 km

From Pythagoras's theorem, the distance from the starting point is:

Distance = √[(200 km)² + (200 km)²]

Distance = √(40000 km² + 40000 km²)

Distance =  282.84 kilometers

Hence, the woman is 282.84 kilometers far from her starting point.

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Final answer:

Roller coasters utilize physics principles like the conversion between potential and kinetic energy, and the manipulation of forces, to create sensations of falling and being thrown around. Apparent weightlessness and centrifugal forces are key in generating these feelings, providing riders with thrilling experiences through rapid descents and high-speed turns.

Explanation:

How Roller Coasters Create Sensations of Falling and Being Thrown Around

Roller coasters are engineered marvels that utilize basic physics principles to create thrilling experiences for riders. The sensations of falling and being thrown around are primarily caused by the manipulation of forces and energy. When a roller coaster car climbs up a hill, it is building potential energy, which is then converted into kinetic energy as it descends. This transition between potential and kinetic energy is what propels the car along the track at high speeds, over hills, and through loops.

Apparent weightlessness is experienced when the car rapidly descends, creating a feeling of free fall. This is similar to the sensation you might feel on a ride like the Supreme Scream, where riders are dropped from a height, causing their guts to feel like they're floating. This feeling is a result of the decreasing force of gravity acting on the riders as they accelerate downwards.

In other attractions, such as the vertical barrel ride, riders experience being pinned to the wall due to centrifugal force. While this force is fictitious in an inertial frame of reference (Earth), it is very real to those in the rotating frame of the ride. The real forces at play include the normal force exerted by the wall on the riders, which counters the gravitational force, creating the sensation of being pressed against the wall.

Roller coasters and similar rides cleverly utilize these principles to create the exhilarating experiences riders love, combining changes in speed, direction, and altitude to manipulate the forces acting on the body.

To find the mass of the lead sphere, calculate its volume using the given diameter and the formula for the volume of a sphere. Then, use the density of lead to find the mass of the sphere.

To find the mass of the spherical ball of lead, we need to first find the volume of the sphere using the given diameter. The formula for the volume of a sphere is V = (4/3)πr^3, where r is the radius. Since the diameter is given as 7.5 cm, the radius is half of the diameter, which is 3.75 cm or 0.0375 m. We can now calculate the volume of the sphere:

V = (4/3)π(0.0375)^3 = 0.0223 m^3

Next, we can use the density of lead, which is given as 11.34 g/cm^3, to find the mass of the sphere. The density is the mass per unit volume, so we can set up the equation:

Mass = Density × Volume = 11.34 g/cm³ × 0.0223 m³ = 0.253 g

Therefore, the mass of the sphere of lead is 0.253 g.

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The gravitational potential energy is:

PE = (125 n) * (9.81 m/s^2) * (301 m)

PE = 37,253 J

If the rock were to fall from the top of the hill, it would gain kinetic energy as it falls and its potential energy would be converted to kinetic energy. The total energy of the rock would remain constant, as energy is conserved.

What is gravitational potential energy?

The energy of an object that is sitting on top of a hill is called gravitational potential energy. Gravitational potential energy is the energy an object possesses due to its position in a gravitational field. It is defined as the work required to move an object from a reference position to its current position against the force of gravity.

The formula for gravitational potential energy is:

PE = m * g * h

where PE is the gravitational potential energy, m is the mass of the object, g is the acceleration due to gravity (9.81 m/s^2 on Earth), and h is the height of the object above the reference position. The unit of gravitational potential energy is typically the joule (J).

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A.) It opens the circuit so that electric charges do not flow to the timer.

Explanation:

A circuit is said to be "closed" if all its points are connected, so that the  current can flow without interruption, while it is said to be "open" if the circuit is interrupted somewhere so that the current cannot flow through it.

In the movie, the character cuts the wire: this way, he opens the circuit, because the charges (the electons) that carry the current cannot flow through it anymore. Therefore, the correct choice is

A.) It opens the circuit so that electric charges do not flow to the timer.

Answer:

A.) It opens the circuit so that electric charges do not flow to the timer.

Explanation:

If 500 thousand BTUs of energy are available to raise the temperature of a water boiler from 20°F to 100°F, then the amount of water that can be added to the boiler is 750 gallons.

The subject of this question is physics, specifically the application of thermodynamics in heating water. Given that 1 BTU is the amount of energy needed to heat one pound of water by one degree Fahrenheit, first we need to convert the weight of water from gallons to pounds (since 1 gallon of water weighs about 8.34 pounds). Then, if we are to increase the temperature of the water from 20°F to 100°F, that's a 80°F difference. Hence, the energy required to heat one pound of water from 20°F to 100°F is 80 BTU.

So, if there are 500 thousand BTUs available, the amount of water (in pounds) that can be heated will be 500,000 BTUs divided by 80 BTU per pound, equating to 6250 pounds. Converting this weight back to gallons (since 1 pound of water is approximately 0.12 gallons), the amount of water that can be added to the boiler is 750 gallons.

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Using 500,000 BTUs of energy, you can raise the temperature of approximately 781.25 gallons of water from 20°F to 100°F, given the specific heat capacity of water and its density. This calculation is based on the energy required to heat each pound of water and converting that to gallons.

To determine how many gallons of water can be heated from 20°F to 100°F using 500,000 BTUs of energy, we need to use the specific heat capacity of water. The specific heat capacity of water is 1 BTU per pound per degree Fahrenheit.

First, calculate the total temperature change:

ΔT = 100°F - 20°F = 80°F

Next, we use the formula:

Energy = mass * specific heat capacity * ΔT

Rearrange to solve for mass (in pounds):

mass = Energy / (specific heat capacity * ΔT)

Insert the known values:

mass = 500,000 BTU / (1 BTU/lb/°F * 80°F) = 6,250 pounds

Since the density of water is approximately 8 pounds per gallon, convert the mass of water to gallons:

gallons = mass / density = 6,250 pounds / 8 pounds/gallon = 781.25 gallons

So, you can add approximately 781.25 gallons of water to the boiler.

Answer:

ΔV=V1-V2 = 27692307.69volts

Explanation:

Hello! Let's solve this!

The formula to calculate the power difference is

ΔV=V1-V2

V = k * (q / r)

k is a constant that equals [tex]k=9*10^{9}N*m^{2}/C^{2}[/tex]

The data we have are:

[tex]k=9*10^{9}N*m^{2}/C^{2}[/tex]

r = 0.0013m

[tex]q1=40*10^{-6}C\

F=15*10^{-6}  N[/tex]

From the following formula we can calculate how much q2 is

F = k * (q1 * q2 / r2)

q2 = (F * r2) / (k * q1)

q2 = (15*10^{-6}  N[/tex] * 0.00132) / (9*10^{9}N*m^{2}/C^{2}[/tex]  *40*10^{-6}C\)

[tex]q2=7.0417x^{-17}C[/tex]

Now we calculate with q1 and q2, V1 and V2 respectively.

V1 = (9*10^{9}N*m^{2}/C^{2}[/tex]  * 40*10^{-6}C\) /0.0013m

V1 = 27692307.69 volts

V2 = (9*10^{9}N*m^{2}/C^{2}[/tex]  * 7.0417x^{-17}C[/tex]) /0.0013m

[tex]V2=4.875*10^{-4}volts[/tex]

Then we solve the potential difference:

V1-V2 = 27692307.69 volts-4.875*10^{-4}volts[/tex]

ΔV=V1-V2 = 27692307.69volts

Answer:

C. 4.9 × 10-4 V

Explanation:

ΔV = E d  

E = force/charge = 15 µN / 40 µC = 0.375 N/C

ΔV = 0.375 N/C * 0.0013 m = C. 4.9 × 10-4 V

A car is traveling with constant velocity. this means that its position changes with time at constant rate at same direction.

The rate at which a body's displacement changes in relation to time is known as its velocity. Velocity is a vector quantity with both magnitude and direction. SI unit of velocity is meter/second.

Velocity informs us about the rate of change of your position, or how quickly your position changes per unit time. Velocity is described in physics as displacement divided by time, where displacement is the difference between your final and initial positions. Furthermore, an object is considered to be moving with constant velocity if it travels the same distance every second. This means that both the amount and direction of the velocity (or speed) stay constant.

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Final answer:

To catch up with the first car at the exit 3.0 km away, the second car, starting from rest, must maintain an acceleration of approximately 0.3524 m/s².

Explanation:

To solve for the acceleration that the second car must maintain to meet the first car at the next exit 3.0 km away, we can use the equations of motion for uniformly accelerated motion.

Since the first car is traveling at a constant speed of 23 m/s and the distance to the next exit is 3.0 km (which is 3000 meters), we can determine the time it will take for the first car to reach the exit. The time (t) can be found using the equation:

Distance = Speed × Time

So, for the first car, Time = Distance/Speed = 3000 m / 23 m/s = 130.43 seconds.

The second car starts from rest (initial velocity = 0) and must cover the same 3000 meters in the same time, but under constant acceleration. We can use the equation for displacement under constant acceleration:

Displacement = Initial Velocity × Time + (1/2) × Acceleration × Time²

Since the initial velocity (u) is 0 m/s for the second car, the equation simplifies to:

3000 m = (1/2) × Acceleration (a) × (130.43 s)²

Now we can solve for the acceleration (a):

Acceleration = (2 × 3000 m) / (130.43 s)²

Acceleration = 6000 m / 17022.1849 s²

Acceleration = 0.3524 m/s²

Therefore, the second car must maintain an acceleration of approximately 0.3524 m/s² to meet the first car at the exit.

The lowest possible frequency that can form in a musical instrument is called the fundamental frequency. Hence option A is correct.

Wave is is a disturbance in a medium that carries energy as well as momentum . wave is characterized by amplitude, wavelength and phase.

Amplitude is the greatest distance that the particles are vibrating. especially a sound or radio wave, moves up and down.

Amplitude is a measure of loudness of a sound wave. More amplitude means more loud is the sound wave.

Wavelength is the distance between two points on the wave which are in same phase.

Phase is the position of a wave at a point at time t on a waveform.

There are two types of the wave longitudinal wave and transverse wave.

Longitudinal wave : in which, vibration of the medium (particle) is parallel to propagation of the wave. Sound wave is a longitudinal wave.

Transverse wave : in which, vibration of the medium (particle) is perpendicular to propagation of the wave. Light wave is a Transverse wave.

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Final answer:

A light-year, which is the distance light travels in a year at a speed of 3.00 x 10^8 m/s, is approximately 9.46 x 10^15 meters or about 10 trillion kilometers. This measure is essential in astronomy for gauging the distances between celestial bodies.

Explanation:

How Far Is a Light-Year?

A light year is the distance that light, traveling at a speed of 3.00 × 108 m/s in a vacuum, covers in one year. To find the distance light travels in a year, you multiply its speed by the number of seconds in a year (31,536,000 seconds).

So, the calculation would be 3.00 × 108 m/s × 31,536,000 s/year = 9.46 × 1015 meters/year. Thus, a light-year is approximately 9.46 × 1015 meters or about 10 trillion kilometers.

This distance is used in astronomy to measure the vast distances between celestial bodies in the universe. Since light travels at this constant speed in a vacuum, it enables scientists to estimate how far away stars and galaxies are based on how long their light takes to reach us.

It actually decreases because I just took a lesson review questions and first I put Increase but it said that was wrong and then I put decrease and it said that was the right answer so it decreases

Answer: Hi!

You know that the boat has a velocity of 18m/s with respect to the water, and the water has a velocity of 2.5m/s.

Both velocities are in the same direction.

Now, if you are standing in the shore, you have a velocity of 0m/h, then you will see the boat moving with his velocity with respect to the water plus the velocity of the water:

this is V = 18 m/s + 2.5m/s = 20.5m/s

Where the addition is direct because both vectors are in the same direction.

Answer: d. all of the above

Methane is a powerful greenhouse gas that contributes to the phenomena of global warming. One mole of methane is 10 times more powerful than one mole of CO₂. It is a dominant greenhouse gas. In Artic region the methane is released from the sea bed and the permafrost soil.  The methane is released as natural gas reserve from these sources as a outcome of the process of methanogeneisis. It involves the partial or uncomplete degradation of dead remains of animals and plants and rapid heating and thawing conditions.

The gas releases in the atmosphere because of all the four options.

Answer: 200 w in apex

Answer:

Cylinder is the most important working part of the engine it is arranged adjacently in the engine.

So, we need to tell how many cylinders are there in order to maintain a proper balance.

So, Some engines have 6 some have 4 cylinders.

So., always 6 and always 4 that is option B and D are discarded.

Therefore, The option A is correct that is an even number.

One of the advantages of solar energy is that it is nonpolluting. :)

Answer: 7.35 Joules

Explanation:

i got it right in my exam