7. A stereo is able to convert 20% of its electrical energy into sound. If 1000 J of sound energy is produced, calculate the electrical energy used [Show all work].

8. A vehicle is only 18% efficient. How was the other 82% of the energy lost?

What type of accidents are among the most common cause of serious work related injuries and deaths

How do you find the net force acting on an object? A. Find the largest force on the object. B. Find the reaction force. C. Assume there is no friction. D. Add all the force vectors.

Explain why it is easier to climb a mountain on a zigzag path rather than one straight up the side. Is your increase in gravitational potential energy the same in both cases? Is your energy consumption the same in both?

3) If the pressure of a sample of gas is doubled at constant temperature, what happens to the volume of the gas? A) The volume doubles. B) The volume is halved. C) The volume quadruples. D) The volume remains the same.

A juggler throws a beanbag into the air with a speed of 1.0 How long does it take for the beanbag to reach its maximum height? Round the answer to two significant digits. Answer using a coordinate system where upward is positive. Show Calculator

Which of the following objects would have the most inertia? A. A sphere with a radius of 5 cm and a mass of 34 grams. B. A sphere with a radius of 4 cm and a mass of 15 grams. C. A sphere with a radius of 8 cm and a mass of 27 grams. D.

A boy slides a book across the floor using a force of five and over a distance of 2M what is the kinetic energy of the book after he slides at assume there is no friction

Where would aliens be if they really do exist here on Earth?

If the mass of an object is 84g and the volume is 12cm3 what is the density

Describe one example of competiton of tropical dry forest