A student lifts her 10.0 kg school bag from the floor, bringing it to a height of 1.4 m.  How much work was done? how much energy was gained?

1. Which of the following is NOT an example of potential energy? a. A running woman b. An incredibly compressed spring G. A tightly stretched rubber band d. An apple dangling off a branch 2. A ball drops from a height h. What more do we need to calculate initial potential energy? a. Elasticity of the Ball b. Mass c. Final Velocity d. Horizontal Displacement

You take a 13kg bag of lead pellets and drop it from 2m above the ground.a. How much gravitational potential energy does the bag have when held 2m above the ground?b. The bag is dropped. Just before it hits the ground, how much kinetic energy does it have?c. How fast is the bag moving just before it hits the ground?d. When it hits the ground, the kinetic energy will be transformed mostly into thermal energy. If 40%of this energy goes into the lead pellets as heat, what will be the increase in temperature of thelead? Assume led has a specific heat capacity of 160J/kg·K.

2. A ball is dropped from the top of a building. You choose the top of the building as a reference point while your friend chooses the bottom as the reference point. Explain whether the energy calculated using the two different reference points are same or different. a. The ball PE at any point b. Change in PE as a result of the fall KE at any point C.

1.) A 15 kg mass is dropped from rest a distance of 18 m above the ground. Make certain you show all your work: a. Draw a picture. b. Indicate on your drawing where KE = 0 and where PE = 0 c. Using Conservation of Energy determine the final speed of the object just before it strikes the ground. d. Next, again showing all your work, use 1-dimensional Kinematics to solve the same problem. e. Which method, in your opinion is easier?

A CHEB hours, 58 minutes, 34 seconds. mpletion Status: QUESTION 12 Two objects interact with each other and with no other objects. Initially object A has a speed of 5 m/s and object B has a speed of 10 m/s. In the course of their motion they return to their initial positions. Then A has a speed of 4 m/s and B has a speed of 7 m/s. We can conclude: O A. mechanical energy was decreased by conservative forces OB. mechanical energy was increased by conservative forces OC. mechanical energy was decreased by nonconservative forces O D. mechanical energy was increased by nonconservative forces O E. the potential energy increased from the beginning to the end of the trip RENG RANG B one level to a higher level after passing through an intermediate valley. The track is in a distance d. The block's initial speed is vo = 5.4 m/s, the height differen

2. Consider the concepts of kinetic energy (KE) and gravitational potential energy (GPE) as you complete these questions. A ball is held 1.4 meters above the floor. Use the terms KE of GPE as your answers. A. When the ball is held motionless above the floor, the ball possesses only B. If the ball is dropped, its energy decreases as it falls. C. If the ball is dropped, its energy increases as it falls. D. In fact, in the absence of air resistance, the amount of impact with the floor. energy. energy when the ball is held motionless above the floor equals the amount of energy at

2. A ball is dropped from the top of a building. You choose the top of the building as a reference point while your friend chooses the bottom as the reference point. Explain whetherthe energy calculated using the two different reference points are same or different. a. The ball PE at any point b. Change in PE as a result of the fall C. KE at any point

I'm trying to understand the different types of energies.  I understand the definitions, but when I apply them to situations, it doesn't make much sense to me. I have the following: A. Entrophy - measure of the amt of disorder, or randomness in a system B. Kinetic Energy - Energy in Motion C. Heat - kinetic energy contained in the random motion of atoms & molecules D. Chemical Energy - type of potential energy which arises from the arrangement of atoms and be release in chemical reactions E. Conservation of Energy: Kinetic to Potential Energy - its not possible to destroy or create energy F. Conservation of Energy: Potential to Kinetic G. Potential Energy - Energy an object has because of its location or structure   When I try to apply to the following, I come up with this: A: A Glass falls off the shelf & breaks B. An orange falling from a tree C. During exercise you get extremely hot. D Animals consume food (organic molecules) to make ATP to walk, breathe, etc. E. A large…

6. An elevator is lifting two people at constant velocity from the first to the twentieth floor of their apartment building. The elevator has a mass of 1000kh, while each of the two people has a mass of 120kg. The elevator lifts them 90 m in 30 s (each is 4.5 m tall) A. How much energy goes into lifting the elevator when empty? B. How much energy goes into lifting the two people? C. What is the power required to lift the elevator with the two on boards?