A boy throws a football horizontally from a window that is 2.8 m above the ground. If he throws the ball with a speed of 12 m/s, how far from the window does the ball land? A. 11.2 m B. 0.23 m C. 9.1 m D. 4.3 m

Two reason friction occurs between surfaces

As a pendulum swings back and forth, its total energy is 16 J. What is its kinetic energy at 3/4 its maximum height?

How do most canyons form? A. Wind deposits sand to form large features called sand dunes. B. Rivers gradually build up eroded sediment over millions of years. C. Volcanoes repeatedly erupt and build up thick layers of lava. D.

The radio waves of a particular AM radio station vibrate 680,000 times per second. What is the wavelength of the wave?

The equation for density is mass divided by volume. the mass of a substance is changed so that it is made of fewer particles. If its volume is unchanged, how will its density change?

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