25. You lift a book from the floor to a bookshelf 1.0 m above the ground. How much power is used if the

upward force is 15.0 N and you do the work in 2.0?

A small car and a large truck are driving down a highway, which statement would support the premise that the truck has more momentum? A) A large truck has a much larger mass. B) A car has a smaller engine than a truck.

A race car completes the final lap of a race on a 2-kilometer circular track. At the start of the lap, it crosses the line at 60 meters/second. It completes the lap 28.57 seconds later, crossing the line at 85 meters/second.

According to Einstein's special theory of relativity, the speed of light in a vacuum would be 3.0 108 m/s in which frames of reference? A. All frames of reference, regardless of acceleration B. Frames of reference that are accelerating C.

A copper block with a mass of 300 grams is cooled to 77 K by being immersed in liquid nitrogen. The block is then placed in a Styrofoam cup containing some water that is initially at + 50.0°C.

What occurs when swimmer pushes through the water to swim

Consider the moment when the spring is at its maximum compression. At that moment, the kinetic energy, the gravitational potential energy, and the elastic potential energy are, respectively, a - zero, at a maximum, and at a maximum b - at a maximum,

Ari, a young patient who is regularly treated by a psychiatrist, feels compelled to carry out repetitive tasks the same way very frequently. If Ari does not conduct these tasks with extreme precision, he can feel extremely nervous and uncomfortable.

A friend says, "Stars produce energy by a fusion chain reaction of helium into hydrogen." Evaluate the validity of this statement. A) It is an valid statement. Stars produce energy by a fusion chain reaction of hydrogen into helium.

If the mass of a material is 42 grams and the volume of the material is 15 cm^3, what would the density of the material be? answer: Unit:

35. An object of mass m moving at speed v0 strikes an object of mass 2m which had been at rest. The first object bounces backward along its initial path at speed v0.