• Given only the constant net force on an object and the object's net displacement, which of the following quantities can be calculated? (A) the net change in the object's velocity (B) the net change in the object's mechanical energy (C) the average acceleration (D) the net change in the object's kinetic energy (E) the net change in the object's potential energy

⦁ Give an example of a situation in the real world where kinetic energy would need to be calculated (besides a roller coaster ride).

Two balls are connected by a spring: m1 , X 1 k, l m2 , X2 Calculate the force (positive, in Newtons) on ball 1 (subscripts 1) with these numbers: • X1 = 0.3 m • X2 = 3.6 m • e = 0.9 m • k = 6700 N/m %3D

Using the work-energy theorem to investigate a traffic scene A car hit a pedestrian and immediately the driver slammed on the brakes to stop the car. During the subsequent trial, the driver's lawyer claimed his client was obeying the posted 35-mi/hr speed limit. You have been called in as the state's expert witness. Your investigation of the accident found that the skid marks made while the brakes were applied until the car stopped were Ax = 94 m long. You also measured the coefficient of kinetic friction between the car's tires and the road (using a drag sled) to be μk = 0.36. (a) Use the work-energy theorem to show that the car's minimum speed vo when the driver slammed on the brakes is given by vo = √2 μg Ax (b) Use the result of part (a) to determine if the car was speeding when the pedestrian was hit. [answer: The car's speed was at least 57 mi/hr when the brakes were applied.] (c) If the car's mass is 1470 kg, how much heat energy was produced while the car was skidding? [answer:…

Vx vx (m/s) 2 A 0 A -2 200evin Bə BCDE F t The diagram is the velocity-versus-time graph for a 3.10 kg object moving along the x-axis. Determine the work (in J)done on the object during the time interval AB. Submit Answer Tries 0/10 Determine the work (in J)done on the object during the time interval BC. Submit Answer Tries 0/10 Determine the work (in J)done on the object during the time interval CD. Submit Answer Tries 0/10 Determine the work (in J)done on the object during the time interval DE. Submit Answer Tries 0/10 Determine the work (in J)done on the object during the time interval EF. Submit Answer Tries 0/10 T

Please explain clearly thank you

Common speech often uses the term "work" to refer to situations where, according to the physics definition of work, there is no actual work done. Find an example of this and explain why the non-physics public considers this work and what a proper physics response would be to this error. You must use ordinary language in an attempt to clarify what is happening do not rely on trigonometry or scalar dot products in you answer . Some examples you could consider include a person pushing on a wall and the wall not moving, a person doing a "bench seatisometric exercise where they squat against a wall, the moon being pulled by gravity as it orbits the earth, etc.

The following graphs give information about a force being applied to move an object. 1. Which force does the most amount of work? 2. Which force does the least amount of work? 5.0 5.0 4.0 4.0 3.0 F1 (N) F3 3.0 2.0 (N) 1.0 1.0 2 3 4 5 6 7 8 1 2 3 4 5 6 7 89 x (m) x (m) 5.0 5.0 4.0 4.0 3.0 F4 3.0 F2 (N) (N) 2.0 2.0 1.0 1.0 2 3 4 5 6 7 8 9 5 6 7 8 9 4 x (m) x (m)

The force on a body is not constant, but it varies as a function of the displacement of the body along the x axis, according to the graph below. (a) How much work is done by the force as the body moves from x=0 to x=3m? (b) What is the work done by the force on the body during to motion from x=3m to x=10m? (c) In which phase(s) during the motion is the force like a force exerted by a spring? please show your work, including diagrams, algebraic equations, and enough written explanations that somebody who is not familiar with the problem could understand what you are doing.

Based on your measurements of vertical position vs time you should have noticed that the maximum height of the ball decreases with each subsequent bounce. A basic analysis of kinetic energy and gravitational potential energy conservation would imply that each bounce should result in the ball returning to the same height from which it was initially dropped. Explain why the height of each subsequence bounce decreases, and why this does not violate the overall conservation of energy.