Question 31 A 5.0 kg block and a 4.0 kg block are connected by a 0.6 kg rod. The

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Question 31

A 5.0 kg block and a 4.0 kg block are connected by a 0.6 kg rod. The links between the blocks and the rod are denoted by A and B. A force F is applied to the upper block. In the figure shown, the blocks and rod assembly move downward at constant velocity. The applied force F is closest to:

Question 31 options:

94 N

92 N

88 N

96 N

90 N

Question 32

A 5.0 kg block and a 4.0 kg block are connected by a 0.6 kg rod. The links between the blocks and the rod are denoted by A and B. A force F is applied to the upper block. In the figure shown, the applied force F equals 150 N. The force in link B is closest to:

Question 32 options:

58 N

56 N

62 N

54 N

60 N

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Question 33

Bumpers on cars are not of much use in a collision. To see why, calculate the average force a bumper would have to exert if it brought a 1200 kg car (a so-called "compact" model) to a rest in 15 cm when the car had an initial speed of 2 m/s (about 4.5 mph). Bumpers are built with springs which compress to provide a stopping force without (hopefully) denting the metal.

Question 33 options:

1.6 × 104 N

6.5 × 105 N

3.2 × 104 N

1.8 × 104 N

5.4 × 104 N

Question 34 (1 point)

Joe and Bill are playing tug-o-war. Joe is pulling with a force of 200 N. Bill is simply hanging on, but skidding towards Joe at a constant velocity. What is the force of friction between Bill's feet and the ground?

Question 34 options:

400 N

Less than 200 N

200 N

Greater than 200 N, but less than 400 N

Question 35

A small car and an SUV are at a stoplight. The car has a mass equal to half that of the SUV, and the SUV's engine can produce a maximum force equal to twice that of the car. When the light turns green, both drivers floor it at the same time. Which vehicle pulls ahead of the other vehicle after a few seconds?

Question 35 options:

The SUV

The car

It is a tie.

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Question 36

A person gives a shopping cart an initial push along a horizontal floor to get it moving, and then lets go. The cart travels forward along the floor, gradually slowing as it moves. Consider the horizontal force(s) on the cart while it is moving forward and slowing. Which of the following statements is correct?

Question 36 options:

Both a forward and a backward force are acting on the cart, but the forward force is larger.

Only a forward force is acting which diminishes with time.

Both a forward and a backward force are acting on the cart, but the backward force is larger.

Only a backward force is acting, no forward force.

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Question 37 (1 point)

Two blocks, A and B, are being pulled to the right along a horizontal surface by a horizontal 100 N pull, as shown in Figure 4.5. Both of them are moving together at a constant velocity of 2.0 m/s to the right, and both weigh the same. Which of the figures below shows a correct free-body diagram of the horizontal forces acting on lower block, B?

Question 37 options:

None of these diagrams is correct.

Question 38

A piano mover raises a 100 kg piano at a constant rate using a frictionless pulley system, as shown in the figure. With roughly what force is the mover pulling down on the rope?

Question 38 options:

2000 N

250 N

500 N

1000 N

Depends on the velocity!

Question 39 (1 point)

The figure shows two forces of equal magnitude acting on an object. If the common magnitude of the forces is 2.3 N and the angle between them is 40°, what third force will cause the object to be in equilibrium?

Question 39 options:

1.8 N pointing to the right

4.3 N pointing to the right

2.2 N pointing to the right

3.5 N pointing to the right

Question 40

Figure 5.5

Three forces A, B, and C act on a body as shown. A fourth force F is required to keep the body in equilibrium. In the figure, the y-component of force F is closest to:

Question 40 options:

+24 N

+28 N

-32 N

-28 N

+32 N

Question 41

A 6.0 kg box is held at rest by two ropes that form 30° angles with the vertical. An external force F acts vertically downward on the box. The force exerted by each of the two ropes is denoted by T. A force diagram, showing the four forces that act on the box in equilibrium, is shown in Figure 5.6. The magnitude of force F is 410 N. The magnitude of force T is closest to:

Question 41 options:

271 N

188 N

235 N

376 N

470 N

94 N

92 N

88 N

96 N

90 N

Explanation / Answer

here ,

let the value of force F is F

Now, for the assembly to move with constant velocity

the net force acting on the system must be zero

balancing the forces in y - direction

F - 4 * g - 5 * g - 0.6 *g = 0

F = 9.6 * g

F = 9.6 * 10

F = 96 N

the force F is closest to 96 N

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