1 The figure shows a to ball on the end of a string that air resistance is (0 )
ID: 1731040 • Letter: 1
Question
1 The figure shows a to ball on the end of a string that air resistance is (0 ) (3)(4) (5) free-body diagram that (4 ?) 3 represents the resultant E) 5 acting on the ball is:A) 1 B)2 D) 4 2. A body slides across a rough, horizontal surface with a steadily decreasing spee comes to rest. Which of the following statements is true? L. The net work done was positive. I1. The net work done was negative. 11. The net work done was zero. IV. The gravitational potential energy increa V. The gravitational potential energy decreased V. The gravitational potential energy remained constant. DX. The kinetic energy A) L IV, and IX 3. Which of the following statements about an astronaut experiencing "weightlessnes constant. B) II, IV,VIII C) III, v, VII D) II, VI, VIII E) I, vI the space lab in stable earth orbit is CORRECT rth's gravity on his/her body mass is cancelled out by the centrip force that acts on them. The astronaut can still use gravity to pour water out of container into a plastic cup The centripetal force that keps hin/her in orbit round the earth is actually the pu e earth's gravity on his/her body. The astronaut is "weightless" because the force of gravity does not extend more than milles above the earth's surface. wo equal lowing masses travel in opposite directions with equal speeds and collide. does NOT depen Which of d on whether the collision is elastic, inelastic, or totally e force the objects exert on each other during the collision otal kinetic energy of the masses after collision peed of each particle after collision. ocity of the center of mass of the system after collision. ocity of each particle after collision. earth's surface. Which one of the following net force acting on the rock at the top of its path is true? aight up from the net n rce is equal to the weight of the rock. ce is instantaneously equal to zero. thrown str nin g the e net force changes from up to down. n of th e is greater than the welght of the rock. e is less than the weight of the rmExplanation / Answer
1. for the given figure, in the position shown
net force on the ball is radially infowars for a constant speed
hence option 4) is the correct direciton of net force on the ball at the instant shown in the figure
2. when the body comes to rest due to sliding on a rough horizontal surface
net work done on the body is -ve
gravitational PE remains constant
KE decreases
hence option II, VI, VIII
option B)
3. in stable earth orbits astroauts feel weightlessness
option d) states that the gravitational force on the astrobnaut in this case is the centripital force keeping the astronaut in the orbit around the earth inweightless condition is true
4. when two masses approach each other and collide (identical mass and speed)
the velocity of center of mass of the system remains constant
hence option d.
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