Bud, a very large man of mass 130 kg, stands on a pogo stick. How much work is done as Bud

compresses the spring of the pogo stick 0.50 m?

After finishing her physics homework, Jane pulls her 50.0 kg body out of the living room chair

and climbs up the 5.0 m high flight of stairs to her bedroom. How much work does Jane do in

ascending the stairs?

A warehouse employee is pushing a 30.0 kg desk across a floor at a constant speed of 0.50 m/s. How much work must the employee do on the desk to change the speed to 1.00 m/s?

A 5.000 kg crate is accelerated from 5.000 m/s to 10.00 m/s. What is the amount of work needed to accelerate the crate, to the nearest tenth of a joule?

How many ways can you find work? W=Fd and

$\Delta$ KE = W   Remember.. to the the change in something compute it for the initial senario and then the second and substract.

A student releases a ball from a height of 1.5 m above the floor.

Which of the following statements best describes the energy of the ball as it falls?

A skateboarder travels back and forth on a U-shaped track during a time trial at a competition. The graph shows the skateboarder's speed as a function of time during the trial.

Which labeled point on the graph identifies the time during the trial that the skateboarder most likely has equal amounts of kinetic energy and potential energy?

What is the impulse on a 45,000 kg airplane when it changes its velocity from 242 m/s to 258 m/s?

A student pushed a box 27.0 m across a smooth, horizontal floor using a constant force of 113 N. If the force was applied for 9.00 s, how much power was developed, to the nearest watt? Remember, 1 Watt = 1 J/s

A pendulum swings back and forth along the dashed path shown in the diagram. Its instantaneous velocity for the location shown is given in the diagram.

What is the pendulum's total mechanical energy at the given location with respect to the bottom of the swing?

During a classroom activity a suction-cup dart with mass of m was launched at a stationary cart that had a mass of 5m. Four students observed the event, and their descriptions are shown in the table.

Which student best described the momentum, kinetic energy, and velocity of the system before and after the collision?

A car traveling on a level road initially has 440 kJ of mechanical energy. After the brakes are applied for a few seconds, the car has only 110 kJ of mechanical energy. What best accounts for the missing mechanical energy?

The pressure of a gas is increasing within a sealed container of fixed volume. Four students are asked to explain what must be happening on a molecular level for this to occur. The student's explanations are shown in the table.

Which student best explains the increase in gas pressure?

A student pulled a 100 kg cart up a ramp using a force of 150 N. By the time the cart reached the top of the ramp, it had gained 980 Joules of potential energy. What happened to the work the student did by pulling the cart?

The law of conservation of energy states that the total energy of an isolated system is constant; energy can be transformed from one form to another, but can be neither created nor destroyed.

In any cyclic process the entropy will either increase or remain the same. Entropy: a state variable whose change is defined for a reversible process at T where Q is the heat absorbed. Entropy: a measure of the amount of energy which is unavailable to do work. So if I boil water and place it into a cup, the heat will move from the water to the cup until it reaches equilibrium. What Law is this?