A mass is attached to one end of a string. The other end of the string is attach

Question

A mass is attached to one end of a string. The other end of the string is attached to a rigid support. The mass is released at A and swings in a vertical are to points B, C, and D, as shown in Figure 8-6. Neglect air resistance and use g = 10 m/s^2. Refer to Figure 8-6. At what point does the mass have the most kinetic energy? A) A B) B C) C D) D E) none of the given points As compared to Jack, Jill does twice the work in half the time. Jill's power output is A) four times Jack's power output. B) the same as Jack's power output. C) one-half as much as Jack's power output. D) twice Jack's power output. E) one-fourth as much as Jack's power output. Object A is moving twice as fast as object B, and has half the mass that of object B. Which object has larger kinetic energy: A) Object A B) Kinetic energy is independent of mass. C) Object B D) Both have same kinetic energy. E) Cannot be determined because speed and mass are not known. Object A is moving twice as fast as object B, and has half the mass that of object B. Both objects encounter the same constant braking force, and are brought to rest. Which object travels the greater distance before stopping? A) Object A B) Object B C) Both travel the same distance. D) Cannot be determined from the information given.

Explanation / Answer

5)

at the bottom , kinetic energy will be maximum

the correct option is C) C

6)

as power = work done/time taken

the correct option is D)

7)

as the kinetic energy = 0.50 * m * v^2

the correct option is

A) object A

8)

again , the kinetic energy of A is more

the correct option is A) object A

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