Truck A has a mass of 5000 kg and a velocity of + 5m/s. Explain why we say truck B has a velocity of - 5m/s.

What are the first four resonant frequencies of a 10-cm long tube with (a) Both ends open? (b) Both ends closed? (c) One end open and one end closed?

What machine will work best to raise a bucket from the well

If a car maintains a constant velocity of 25 m/s what it the car's acceleration

Which statements describe the motion of a planet according to Kepler's second law? Check all that apply. The speed of a planet varies as it moves in its orbit. The speed of a planet is constant as it moves in its orbit.

What is the change in electric potential energy in moving an electron from a location 3 * 10-10 m from a proton to a location 7 * 10-10 m from the proton? The result should be in joules, with an appropriate sign.

Why is flammability a chemical property?

Luke pulls a sled using a force of 65 N for a distance of 25 m across level ground. The rope Luke pulls forms an angle of 25° with the ground. About how much work does Luke do on the sled? 250 J 690 J 1,500 J 1,600 J

Intramolecular and intermolecular forces hold together which of the following? A. atoms within a molecule B. molecules within an object C. charged particles within a salt crystal D. the atoms within compounds E. all of the above

Why is it that a football does not stay in motion at a constant speed when thrown, as the First Law of Motion suggests that it would? 1) Air resistance and acceleration 2) Gravity and mass 3) Distance, mass and gravity 4) Air resistance and gravity

A student pulls a box across a horizontal floor at a constant speed of 4.0 meters per second by exerting a constant horizontal force of 45 newtons. approximately how much work does the student do against friction in moving the box 5.