141 Fall 2019 #4

Please read carefully and answer properly

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* 1. In order to receive credit, we need your name

First Name

Last Name

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Below, you let a box on skis go on a super slippery ski slope from the position shown. The dotted line indicates the height from which the box was released.

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* 2. Which path is closest to the one the box will take?

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* 3. A woman exerts a constant horizontal force on a large box. As a result, the box moves across a horizontal floor at a constant speed “v_o”.

The constant horizontal force applied by the woman:

has the same magnitude as the weight of the box.

is greater than the weight of the box.

has the same magnitude as the total force which resists the motion of the box.

is greater than the total force which resists the motion of the box.

is greater than either the weight of the box or the total force which resists its motion.

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* 4. If the woman in the previous question doubles the constant horizontal force that she exerts on the box to push it on the same horizontal floor, the box then moves:

with a constant speed that is double the speed “vo” in the previous question.

with a constant speed that is greater than the speed “vo” in the previous question, but not necessarily twice as great.

for a while with a speed that is constant and greater than the speed “vo” in the previous question, then with a speed that increases thereafter.

for a while with an increasing speed, then with a constant speed thereafter.

with a continuously increasing speed.

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In the figure below, student "a" has a mass of 95 kg and student "b" has a mass of 77 kg. They sit in identical office chairs facing each other.

Student "a" places his bare feet on the knees of student "b", as shown. Student "a" then suddenly pushes outward with his feet, causing both chairs to move.

In the figure below, student "a" has a mass of 95 kg and student "b" has a mass of 77 kg. They sit in identical office chairs facing each other. <br><br>Student "a" places his bare feet on the knees of student "b", as shown. Student "a" then suddenly pushes outward with his feet, causing both chairs to move.

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* 5. During the push and while the students are still touching each other:

neither student exerts a force on the other.

student "a" exerts a force on student "b", but "b" does not exert any force on "a".

each student exerts a force on the other, but "b" exerts the larger force.

each student exerts a force on the other, but "a" exerts the larger force.

each student exerts the same amount of force on the other.

none of these choices are correct

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* 6. An elevator is being lifted up an elevator shaft at a constant speed by a steel cable as shown in the figure below. Which best describes the relationship between the tension on the cable and the force of gravity on the elevator?

1. The tension is greater than the force of gravity

2. The tension is less than the force of gravity

3. The tension and the force of gravity are the same

4 Without knowing the mass, we can't answer this question.

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* 1. In order to receive credit, we need your name

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Below, you let a box on skis go on a super slippery ski slope from the position shown. The dotted line indicates the height from which the box was released.

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* 2. Which path is closest to the one the box will take?

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* 3. A woman exerts a constant horizontal force on a large box. As a result, the box moves across a horizontal floor at a constant speed “vo”. The constant horizontal force applied by the woman:

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* 4. If the woman in the previous question doubles the constant horizontal force that she exerts on the box to push it on the same horizontal floor, the box then moves:

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* 5. During the push and while the students are still touching each other:

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* 6. An elevator is being lifted up an elevator shaft at a constant speed by a steel cable as shown in the figure below. Which best describes the relationship between the tension on the cable and the force of gravity on the elevator?

* 3. A woman exerts a constant horizontal force on a large box. As a result, the box moves across a horizontal floor at a constant speed “v_o”.

The constant horizontal force applied by the woman: