A high diver steps off a diving platform that is 10 meters above the water. If no air resistance is present, during the fall there will be a decrease in the diver's
Which of the following is a best example of work being done on an object?
What is the kinetic energy of a 2 kg toy car that is moving with a velocity of 5 m/s
A hydraulic lift used at an automotive repair shop raises a 1000 kg car two meters off the ground. What is the potential energy given to the car.
A rock climber weighs 550 N and is carrying a backpack that weights 50 N. How much total work has been done after she climbs 12 m.
Fireworks displays are common on the 4th of July. Energy changes occur during the flight of a firework. Which of the following represents a correct energy change?
A skateboarder travels from location 1 to location 4 as shown below.
At which location does the skateboarder have the most kinetic energy and the least potential energy?
Three different boxes are lifted to different heights.
Box X weighs 115 N and is lifted tp 15 m.
Box Y weighs 210 N and is lifted to 10 m.
Boz Z weighs 305 N and is lifted to 5 m.
Which of the following statements best describes the boxes' change in mechanical energy?
Windmills are used to covert wind energy into a more useful form. In most cases, there are three steps in this process. The energy is in a different form at each step. Which of the following flowcharts shows the most likely order of the energy change?
The diagram shows two bowling balls of equal mass. Ball A is resting near the edge of a shelf. Ball B is resting on the ground below.
Which of the following statements best describes the diagram above?
Which statement best explains how iron can become a magnet?
Two parallel copper wires are each carrying the same electrical current in the same direction. Which statement explains how they respond to each other?
The diagram below shows an object made from a battery, a nail, and some wire.
What will happen if you touch a metal paperclip to the nail?
Which of the following electromagnets would have the greatest magnetic fi eld?
The diagram below shows a bar magnet within a coil of conducting wire. The magnet is moved back and forth. The magnet never has contact with the wire.
As the magnet is moved, the wire will
The diagram below shows current flow through a wire.
Which of the following represents the magnetic field resulting from the current?
The diagram pictured shows a loop of wire being rotated at a constant rate about an axis in a uniform magnetic fi eld.
As the speed of rotation of the wire loop is increased, the maximum voltage induced in the loop
What is the main advantage of using alternating current (AC) over direct current (DC) when transmitting electricity?
The primary coil of a transformer has 400 turns; the secondary coil has 1,000 turns. An alternating current is sent through the primary coil. The voltage in the primary coil has an amplitude of 17 V. Which statement best describes the voltage amplitude in the secondary coil?
The diagram shows a wire loop rotating between magnetic poles. During 360 degrees of rotation from the position shown, the induced voltage changes in
