Time is relative, what does that mean?

Which of the following examples does not demonstrate a change in velocity

What is the acceleration of a car that goes from zero to 40 m/s in 20 seconds

When light travels from a medium it moves faster in (such as air) to a medium it moves slower in (such as glass) its velocity decreases. What else happens? a) The frequency increases but the wavelength remains the same.

A box weighing 100 newtons is pushed up an inclined plane that is 5 meters long. It takes a force of 75 newtons to push it to the top, which has a height of 3 meters. What is the efficiency?

As the bell rings, which energy transformation occurs? A. Mechanical energy is converted into sound energy. B. Chemical energy is converted into heat energy. C. Mechanical energy is converted into heat energy. D.

A refrigerator is a system. The energy input into the refrigerator system (in the form of electricity) is the same as the amount of energy output from the system. Which of the following best describes the energy output of the system?

A 1,120 kg car is travelling with a speed of 40 m/s. Find its energy.

3. Calculate the amount of current through a 45-watt light bulb that is connected to a 120-volt circuit in your home.

Are oranges called oranges because oranges are orange, or is orange called orange because oranges are orange?

An object at rest has no net force acting on it. a. True b. False