Friction between solids can be most accurately defined as the force that opposes the sliding motion of two surfaces that are touching each other.

True or false

A boat floats up and down with a time period of 2 seconds as the wave passes under it. What is the frequency?

A Universe Question! An astronomer see a star that is very far away but still very bright. What can she conclude about the star? A) The star must be very large. B) The star must be very small. C) The star must be moving away from Earth.

What speed would a fly with a mass of 0.55g need in order to have a kinetic energy of 7.6 •10^4 j?

Use your knowledge of the climate zones of the United States and Canada to interpret the map above. Look at the map key. What is the correct heading for zone four (4) ? a. Tropical b. High-latitude c. Dry d. Midlatitude

Which of the following is a consequence of using fossil fuels as an energy source? A. decreased carbon dioxide levels B. increased biodiversity C. increased acid rain D. decreased ecosystem disruption

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