A car whose weight is 20,000 N (meaning that its mass is about 2000 kg) is travelling at constant speed of 25 m/s up an incline that makes an angle of 4o with respect to the horizontal. Consider the car alone to be the system.   A.What work does the gravitational interaction between the car and the Earth do on the car each second? B.What does the momentum requirement imply about the total external force acting on the car? C. Is the car's internal energy increasing or decreasing?   Defend your response in each case.

A 1500kg sport car is moving westbound at 20m/s on a level road when it collided with a 4000kg truck driving east on the same road at 15m/s. The two vehicles remain locked together after the collision.b) what is the total kinetic energy of the two vehicles just after collision

Activity 2 – Kinetic Energy Solve the following problems with complete solutions. 1. Calculate the speed of an 8.0 × 10* kg airliner with a kinetic energy of 1.1 × 10° J. 2. What is the speed of a 0.145 kg baseball if its kinetic energy is 109 J? 3. Two bullets have masses of 3.0 g and 6.0 g, respectively. Both are fired with a speed of 40.0 m/s. Which bullet has more kinetic energy? What is the ratio of their kinetic energies?

Jane and Jake are looking at what happens to body 1 of mass m and body 2 of mass 2m, initially at rest, when equal forces are applied separately to the two bodies. Jake says that equal forces applied for equal times do equal amounts of work on the two bodies. Jane says that the two forces do equal amounts of work only if the two bodies move equal distances in the direction of the forces. Which one, if either, is correct? O Jake, because the speed of body 1 is half the speed of body 2, but m¡v1= m2V2- O Jane, because work does not depend on mass, only on force times distance. O Jake, because all bodies travel equal distances when equal forces are applied for equal times. O Jane, because it takes the same time for all bodies to travel equal distances when equal forces are involved. O Neither, because we can't compare the amounts of work done on bodies of different mass.

4. Two identical masses are suspended by strings wrapped around identical frictionless pulleys, except that a heavy metal ring has been added to one of the pulleys. The masses are released from rest and allowed to fall to the ground. How does the final kinetic energy of the falling mass compare between the two systems? Clearly explain your line of reasoning using physics concepts and equations. m m

A 5.0kg block of wood is at the top of a table when a 5.0g bullet moving horizontally at 190m/s hits it. The bullet sticks with the wood. The wood is slides 2.5m along the table and stops. a) Find the speed of the block just after the impact b) Find the friction force between the wood and table show complete step by step soln and include the drawing

A 65 kg person rides a 20 kg bicycle at a speed of 11 m/s. The cyclist runs into a parked car and comes to a fast stop. The bike collapses 0.95 m during the crash.  a) Determine the kinetic energy of the cyclist/bike before the crash.  b) Find the average force exerted on the cyclist/bike by the parked car.

A diver of mass 68 kg stands on a diving board 5.0 m above a pool. At the moment of the jump, the diving board transfers its 3400 J of energy to the diver, who leaves the board at an angle of 35°. a. What is the (total) speed of the diver just as they leave the diving board? b. What is the maximum height (relative to the surface of the water) of the diver? c. How long does it take for the diver to reach the surface of the water?

An arrow of mass 0.0348 kilograms is placed on a bow, and the string is drawn back 0.533 meters with an average force of 143 newtons. a. With what speed does the arrow leave the bow?  b. If the arrow is shot straight up, how high does it rise? Solve using the law of conservation of energy, not a constant acceleration equation.

A particle of mass m = 1.50 kg moves along one dimension and is subject to a single force, whose potential energy function is given by U(x) = x4 – 2x2 + 4 (where U is measured in Joules and x is measured in meters). At the moment when the particle is located at position x = 1.50 m, its speed is v = 2.50 m/s. %3D