Help! I have a test tomorrow, the answers to these are not in the book and I jus

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Help! I have a test tomorrow, the answers to these are not in the book and I just want to make sure I’m getting the right answers. Help! I have a test tomorrow, the answers to these are not in the book and I just want to make sure I’m getting the right answers. (a) Velocity and acceleration (b) Velocity and the sum of the forces (c) Acceleration and the sum of the forces (d) Acceleration and force (e) Both b and c are correct. 6. You have probably observed that magnets FI attract objects made of certain metals, such as steel. You tie a steel paperclip to a table- top with string and bring a strong magnet above it so that the paperclip is positioned as shown in Figure Q3.6. Which answer correctly compares the magnitude of the force exerted by the magnet on the paper- clip to the magnitude of the force exerted by the paperclip on the magnet? (a) Fmagnetp elip on magnet (b) Fmagnetonclip Felip on magnet (c) Fmagnetonclip lip on magnet 0?Choose all answers FIGURE Q3.7 (a) vy

Explanation / Answer

Q6.

magnetic force is reciprocal in nature and using newton’s third law,

force of magnet on clip = force of clip on magnet

hence option C is correct.

Q7.

part I.

for the object to move at constant speed, net force=0

hence force required=2 N in downward direction

so option a is correct.

part II.

for the object to accelerate downwards, net force is to be in downward direction

hence force in downward direction > force in upward direction

so option C is correct.

part III.

for the object to accelerate upwards, net force is to be in upward direction

hence force in upward direction > force in downward direction

as that is the case already, hence F=0 is the required solution

so option E is correct.

part IV.

in order to move down, it has not provided enough information regarding acceleration or velocity.

hence option f is correct.

Q18.

as net force on the spaceship in forward direction is 0 (as it is moving in constant speed),

hence minimum force needed would be any force larger than zero.

hence option C is correct.

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