Work is being done in which of these situations? all motions are at a constant velocity

For water vapor to turn back i to a liquid what do you do to it's temperature

If a space station has velocity of 0 m/s in a mass of 15,000 kg what is its momentum

Two carts with masses of 4.32 kg and 2.66 kg move toward each other on a frictionless track with speeds of 4.86 m/s and 3.93 m/s respectively. The carts stick together after colliding head-on. Find the final speed.

A relaxed rubber band is stretched back, then released. It flies through the air and comes to rest on the ground. Which of the following correctly describes the sequence of energy transformations that occur in this scenario?

A square, single-turn coil 0.132 m on a side is placed with its plane perpendicular to a constant magnetic field. An emf of 27.1 mV is induced in the winding while the area of the coil decreases at a rate of 0.0785 m2 / s.

One of the main reasons steel is used more widely than iron is because it's lighter softer stronger than iron

What is the frequency of a wave with a velocity of 21.2 m/s and a wavelength of 8.3m?

Positive ions have blank protons than electrons

What is the weight, in n, of an object with a mass of 200 kg at a location where g = 9.6 m/s2. round the final answer to the nearest whole number?

A 1.7 kg book is lying on a 0.77 m - high table. You pick it up and place it on a bookshelf 2.0 m above the floor. how much work does gravity do on the book?