1. You wish to heat 20 kg of water from 40°C to 80°C. How many kcal of heat are necessary to do this? To how many kJ does this correspond?

A 5,400 W motor is used to do work. If the motor is used for 640 s, about how much work could it do? 8.4 J 4,800 J 6,000 J 3,500,000 J

What is the absolute value of the horizontal force that each athlete exerts against the ground?

Which statement best describes acceleration? Acceleration is the rate of change of force of an object. Acceleration is the rate of change of the direction of an object. Acceleration is the rate of change of velocity of an object.

The tides are ... a renewable energy source a constant energy source an unreliable energy source which is the right statement

An automobile tire is rated to last for 35,000 miles. to an order of magnitude, through how many revolutions will it turn?

A person with his ear to the ground, sees a huge stone strikethe concrete pavement. A moment later two sounds are heard from theimpact: one travels n the air and the other in the concrete, andthey are 2.2 s apart.

An athlete on a sled is moving with a speed of 3.0 m/s across a pond covered with ice. If the total mass of the sled-athlete system is 95.0 kg, what magnitude of the average force is required to bring the sled to rest in 15.0 s

What device is used for side mirrors on automobiles

In order for an object to accelerate, what must be applied?

The switch S is closed at t = 0 (assume that the battery voltage remains constant at 10V and the resistance of the inductor is negligible).