3. A crane lifts a 100-kg log at a height of 10 meters above the ground and gains a certain amount of potentialenergy. How much potential energy would it possess if it is lowered 5 meters below?A. The same potential energyC. Twice as much potential energyB. Half as much potential energyD. Four times as much potential energy10 meters4. A marble is positioned in A and is allowed to move down the track to B and is able to reach point C. Whichof the following statements is true?A. The marble has the greatest kinetic energy at point A.B. The marble has the greatest potential energy at point B.C. The potential energy of the marble at point A is twice the potentialenergy at point C.D. All statements are true.5. Student A lifts books weighing 10 kg onto a shelf in 5s. If student B lifts the same book at the same heightwith student A in 10s, which of the following is true?A. Student A and B have zero powerB. Student A has less power than student BC. Student A and B have the same powerD. Student A has greater power than student BStudent AStudent B

3. Given : m = 100 kg h1 = 10 m h2 = 5 m

Answered: 3. A crane lifts a 100-kg log at a…

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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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?
A certain force does −7 J of work in moving an object located at position A to position B. The same force then does −7 J of work in moving it back from position B to position A. No other forces did work. Was mechanical energy conserved? Was energy conserved? a. Total energy was conserved but not mechanical energy. b. Mechanical energy was conserved but not total energy. c. Both mechanical energy and total energy were conserved d. Neither mechanical energy nor total energy was conserved.
86. What is the kinetic energy of a 20kg object moving at 2 m/s? * O a. 10 J b. 20 J C. 40 J O d. 100 J
If you drop a 13.Okg ball from a height of 30m (neglect friction). How many Joules of Potential Energy does it have at the moment before dropping it? 3. a. b. How many Joules.of Kinetic Energy will it have when it is halfway through its fall? c. How fast is it going as it impacts the ground?
What is the best description of gravitational potential energy? a. The energy stored, dependent on the object's height from the ground. b. The strength from a moving object. c. The energy exerted through stretching or squashing an object. d. The strength stored between molecules, in chemical bonds.
1. A roller-coaster car with a mass of 1200 kg starts at rest from a point 20 m above the ground. At point B, it is 9 m above the ground. [Express your answers in kilojoules (kJ).] a. What is the initial potential energy of the car? b. What is the potential energy at point B? c. If the initial kinetic energy was zero and the work done against friction between the starting point and point B is 40 000 J (40 kJ), what is the kinetic energy of the car at point B 2. The time required for one complete cycle of a mass oscillating at the end of a spring is 0.80 s. What is the frequency of oscillation?
1. An apple hanging from a limb has potential energy because of its height. If it falls, what becomes of this energy just before it hits the ground? a. its total energy goes to zero b. its P.E. is transformed into kinetic energy c. its energy is transformed into the thermal energy of the apple and the ground d. its P.E. increases and just before it hits the ground it is doubled 2. An energy bar contains 105 kilocalories. How much work is the equivalent of this energy bar? a. 25.06 KJoules b. 439.95 kJoules c. 10.5 kJoules d. 0.14 Joules letter only
13. You learned in Science that Energy is conserved, that Potential Energy must balance Kinetic energy. Mathematically, that means: 1 mgh =-mv², where mgh is Potential %3D Energy 1 and -mv² is Kinetic energy. Reminder that m is 2 mass, g is the acceleration due to gravity, h is height and v is velocity. a) Balance this equation such that the sum of Potential and Kinetic Energy is zero (hint: gravity is negative). b) Solve this equation for v; again, you only need the Algebra you've learned! (hint: don't worry about the negative at the end!) Show your work! + tv MAR 18
3. A 1.8 kg book has been dropped from the top of the football stadium. Its speed is 4.8 m/s when it is 2.9 meters above the ground. What is its mechanical energy?
Which of the following statements are FALSE? A. Energy is a vector physical quantity. B. Energy is always required to do work. C. Total mechanical energy can never be zero. D. When law of conservation of mechanical energy is invoked, there can never be a waste energy in an ideal system. E. When law of conservation of mechanical energy is invoked, there can never be a waste energy in a real-world system. F. Kinetic energy can be negative. G. Potential energy can be negative. H. Work is equivalent to the negative change in kinetic energy. I. Work is equivalent to the negative change in potential energy. J. In a conservative system where only gravitational force acts, the total mechanical energy is constant at every point of the motion. K. In a non-conservative system where certain external forces may act, the total mechanical energy is not constant at every point of the motion. L. The entire universe may be considered as a closed system where the total energy is constant. choices O…
8. You were told that on top of the skyscraper that you are in, the gravitational potential energy at the top is 1 MegaJoule. If this was measured relative to an average person weighing 65 kg, how high is the skyscraper? a. 156.8 m b. 657.2 m c. 1568 m d. 6572 m 9. A load with m = 105 g is attached to a vertical spring that has been compressed by 15 cm. What is the force constant of the spring? a. 6.86 N/m b. 1.029 N c. 0.105 kg d. 7.72 x 102J
10. If the net work done on a particle is zero, which of the following statements must be true? A. The velocity is decreased B. The velocity is unchanged C. The speed is unchanged D. The velocity is zero 11. The work required to accelerate an object on a frictionless surface from a speed v to a speed 2v is A. equal to the work required to accel erate the object from v = 0 to v B. twice the work required to accelerate the object from v = 0 to v C. three times the work required to accelerate the object from v = 0 to V D. four times the work required to ac celerate the object from 2v to 3v E. not known without knowledge of the acceleration 12. A certain truck has twice the mass of a car. Both are moving at the same speed. If the kinetic energy of the truck is K, what is the kinetic energy of the car? A. K/4 B. K/2 C. 0.71K D. K E. 2K

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