A mechanical device requires 420 J of work to do 230 J of work to lift a crate. What is the efficiency of the device? 190% 0.5% 183% 55%

During a solar eclipse, you have the opportunity to observe stars around the periphery of the sun with a telescope. Which of the following is an observation that you would expect to make? A. The starlight is decentralized. B.

Why is a cathode ray tube connected to a vacuum pump?

The specific heat capacity of silver is 0.06 cal/g°C. How much energy is needed to flow into a 5-gram sample to change its temperature from 10°C to 11°C?

A 7.06 kg block initially at rest is pulled to the right along a horizontal, frictionless surface by a constant, horizontal force of 12.1 N. Find the speed of the block after it has moved 3 m. Answer in units of m/s.

Which of these substances is a compound? a.) chlorine b.) nitrogen c.) uranium d.) ammonia

How do you find potienal energy

You are working on a curcuit that starting to get too much current. What could you do to slow down the electron flow? A) add more watts B) increase resistance C) increase voltage D) add more volts

A stone is thrown with an initial velocity of 20 meters per second straight upward from the edge of a cliff 100 meters above a canyon floor. The stone just misses the cliff'a edge on its way down.

A crowd in a stadium is heard by a man standing 823.2 m away. The man hears the noise 2.5 seconds after the noise occurs. How fast was the sound traveling? What's the answer?

Which is not support the theory of plate tectonics?