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Physics

Alijah Brady

What landform is created when magma squeezes between rock layers to form a hardened slab of rock?

a. volcanic neck

b. dike

c. lava plateau

d. sill

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Physics

Elaine Burton

A 200 N wagon is to be pulled up a 30 degree incline at constant speed. how large a force parallel to the incline is needed if friction is negligible?

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Physics

Guest

The temperature of 1 m^3 of water is decreased by 10°C. If this thermal energy is used to lift the water vertically against gravity, what is the change in height of the center of mass?

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Physics

Nathaniel Mccullough

If the net torque is zero, what does this imply about the clockwise and counterclockwise torques.

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Physics

Davin Cowan

Which of the following is an example in which kinetic energy is converted to potential energy?

O A. A rock falls down a cliff.

OB. A match burns.

OC. A spring is stretched.

OD. A light bulb glows brightly.

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Physics

Ricky Bradford

What THREE properties determine the speed at which a sound wave travels in a medium?

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Physics

Johanna Fitzgerald

As a skydiver falls, the air is forced to move around him. What energy transformation does this cause? A. Potential energy from the skydiver becomes potential energy in the atmosphere. B. Kinetic energy from the skydiver becomes heat energy in the atmosphere. C. Kinetic energy from the atmosphere becomes potential energy for the skydiver. D. Heat energy from the atmosphere becomes kinetic energy for the skydiver.

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Physics

Gauge Cohen

On your way to the dance through there is some slow driving person in front of you so you slam on the gas going 30 mi/hr to 60 mi/he. Luckily your date brought a stop watch and told you the whole thing took place in 10s. What is your acceleration and how far did you and your extremely well equipped date go?

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Physics

King

The sources of the heat inside Earth

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Physics

Cuddle Pig

A microwave is rated at 750 watts. How long will it take the microwave to do 5700 J of work on a cup of water? Assume 100% efficiency.

A)

0.13s

B)

2s

C)

7.6s

D)

4,275,000 s

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Physics

Janessa Brown

A block hangs at rest from the ceiling by a piece of rope. Consider the forces acting on the block. Is gravity present or absent?

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Physics

Rhett Levine

A nurse counts 66 heartbeats in one minute. What is the period of the hearts oscillation? In minutes

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Physics

Jamar

A room is 16 ft x 12 ft x 12 ft. would air enter or leave the room if the temperature changed from 27°c to - 3°c while the pressure remained constant? Determine the volume of the air which moved in or out of the room.

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Physics

Tori

Suppose that at room temperature, a certain aluminum bar is 1.0000 m long. The bar gets longer when its temperature is raised. The length l of the bar obeys the following relation: l=1.0000+2.4*10-5T, where T is the number of degrees Celsius above room temperature. What is the change of the bar's length if the temperature is raised to 11.3 ∘C above room temperature?

Express your answer in meters to two significant figures.

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Physics

Nora Stephens

Describe the energy transformations that take place in a battery-operated fan.

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