A mover hoists a 200 kg piano from the ground to a height of 10 m using a single pulley. What was the change in the pianos energy? a. 20j b. 200j c. 2000j d. 20000

What is the reason why feather falls at a slower rate than a Hammer on Earth not on the moon

A mechanic uses a mechanical lift to raise a car. The car weighs 11,000 N. The lift raises the car 2.5 m. How much work is required to accomplish this task? A. 22,500 J B. 27,500 J C. 2.27 x 10-4 J D. 4400 J

The human immune system fights infection by releasing 1. ATPs 2. Antibiotics 3. Antibodies 4. Antigens

How loud is a gunshot? A. 120 decimals, B. 150 decimals, C. 100 decimals, or D. Other Answer. If D, describe what answer it is.

Explain how you can tell the difference between the voices of two people if they are saying the same word.

A spring with a spring constant of 1200 N/m has a 55-g ball at its end. The energy of the system is 5.5J. What is the amplitude of vibration?

Force F1 acts on a particle and does work W1. Force F2 acts simultaneously on the particle and does work W2. The speed of the particle does not change. Which one of the following must be true? a. W1 is zero, and W2 is positiveb. W1 = - W2c.

The amplitude of a sound is the Group of answer choices frequency of the sound. magnitude of displacement of a sound pressure wave. psychological aspect of sound related to timbre. amount of sound energy falling on a unit area.

Air at 38°C and 97% relative humidity is to be cooled to 18°C and fed into a plant area at a rate of 510 m/min. a. Calculate the rate (kg/min) at which water condenses. b.

a 7.26kg bowling ball (16 pounds) is at rest at the end of the bowling lane. : how long did you push the ball in this situation