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

Find the product. If the result is negative, enter "-". If the result is positive, leave the box empty. 7 (-a^2) ^2 (-b^3)

A sound wave has a frequency of 684 Hz in air and a wavelength of 0.53 m. What is the temperature of the air? Assume the velocity of sound at 0◦C is 327 m/s. Answer in units of ◦C.

You find it takes 200 J of heat to take 4 kg of an unknown substance from 200 K to 240 K. It does not change phases during this interval. If you added 300 J of heat to the substance instead of 200 J, what would be its final temperature?

To find the correct units for the speed of a car we must ... A) Multiply the distance the car travels by the time it takes to travel. B) Add the distance the car travels and the time it takes to travel.

Which reaction fuels the burning of the sun

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

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?

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?

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

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.