Question 1

Two blocks, A and B, are being pulled to the right along a horizontal surface by a horizontal 100 N pull, as shown in the figure. 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?

Accepted Answer

A)   
B)   
C)   
D)   
E)   None of these diagrams is correct. B

Question 2

Two blocks, A and B, are being pulled to the right along a horizontal surface by a horizontal 100 N pull, as shown in the figure. 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 upper block, A?

Accepted Answer

A)   
B)   
C)   
D)   
E)    E

Question 3

-In the figure, a certain type of string will break if the tension in the string exceeds 300 N. A number of 8-kg weights are hung one below the other from a hook in the ceiling using this string. The number of weights that causes the string to break and the string segment that will break are as follows:

Accepted Answer

A)   When the 4th weight is added, the top string segment will break.
B)   Each segment has a tension of 78.4000015 N, and there is no limit to the number of weights that can be suspended.
C)   When the 4th weight is added, the bottom string segment will break.
D)   When the 4th weight is added, all string segments will break.
E)   When the 38th weight is added, all string segments will break. A

Question 4

Consider what happens when you jump up in the air. Which of the following is the most accurate statement?

Accepted Answer

A)   It is the upward force exerted by the ground that pushes you up, but this force can never exceed your weight.
B)   You are able to spring up because the earth exerts a force upward on you which is stronger than the downward force you exert on the earth.
C)   Since the ground is stationary, it cannot exert the upward force necessary to propel you into the air. Instead, it is the internal forces of your muscles acting on your body itself which propels the body into the air.
D)   When you push down on the earth with a force greater than your weight, the earth will push back with the same magnitude force and thus propel you into the air.

Question 5

A leaky faucet drips 40 times in 30.0 s. What is the frequency of the dripping?

Accepted Answer

A)   1.3 Hz
B)   0.75 Hz
C)   1.6 Hz
D)   0.63 Hz

Question 6

At their closest approach, Venus and Earth are 4.20 × 1010 m apart. The mass of Venus is 4.87 × 1024 kg, the mass of Earth is 5.97 × 1024 kg, and G = 6.67 × 10-11 N · m2/kg/2. What is the force exerted by Venus on Earth at that point?

Accepted Answer

A)   1.10 × 1018 N
B)   4.62 × 1028 N
C)   5.43 × 1026 N
D)   6.30 × 1020 N
E)   1.72 × 1019 N

Question 7

On its own, a tow truck has a maximum acceleration of 3.0 m/s-2. What would be the maximum acceleration when the truck was towing a bus of twice its own mass?

Accepted Answer

A)   2.5 m/s-2
B)   2.0 m/s-2
C)   1.5 m/s-2
D)   1.0 m/s-2

Question 8

A 0.25 kg harmonic oscillator has a total oscillation energy of 4.0 J. If the oscillation amplitude is 20.0 cm, what is the oscillation frequency?

Accepted Answer

A)   4.5 Hz
B)   1.4 Hz
C)   2.3 Hz
D)   3.1 Hz

Question 9

The figure shows an object's acceleration-versus-force graph. What is the object's mass in grams?

Accepted Answer

A)   2.5
B)   1.6
C)   630
D)   400,000

Question 10

An object accelerates at 4.1 m/s2 under the action of two rubber bands. What will be the object's acceleration if it is pulled by four rubber bands?

Accepted Answer

A)   8.2 m/s2 
B)   16 m/s2 
C)   4.1 m/s2 
D)   2.1 m/s2

Question 11

The figure shows two forces acting on an object. They have magnitudes F1 = 6.3 N and
F2 = 2.1 N. What third force will cause the object to be in equilibrium?

Accepted Answer

A)   6.6 N at 162° counterclockwise from 1 = 6.3 N and F2 = 2.1 N. What third force will cause the object to be in equilibrium?    
A)   6.6 N at 162° counterclockwise from   
B)   6.6 N at 108° counterclockwise from   
C)   4.2 N at 162° counterclockwise from   
D)   4.2 N at 108° counterclockwise from  " class="answers-bank-image d-inline" rel="preload" >
B)   6.6 N at 108° counterclockwise from 1 = 6.3 N and F2 = 2.1 N. What third force will cause the object to be in equilibrium?    
A)   6.6 N at 162° counterclockwise from   
B)   6.6 N at 108° counterclockwise from   
C)   4.2 N at 162° counterclockwise from   
D)   4.2 N at 108° counterclockwise from  " class="answers-bank-image d-inline" rel="preload" >
C)   4.2 N at 162° counterclockwise from 1 = 6.3 N and F2 = 2.1 N. What third force will cause the object to be in equilibrium?    
A)   6.6 N at 162° counterclockwise from   
B)   6.6 N at 108° counterclockwise from   
C)   4.2 N at 162° counterclockwise from   
D)   4.2 N at 108° counterclockwise from  " class="answers-bank-image d-inline" rel="preload" >
D)   4.2 N at 108° counterclockwise from 1 = 6.3 N and F2 = 2.1 N. What third force will cause the object to be in equilibrium?    
A)   6.6 N at 162° counterclockwise from   
B)   6.6 N at 108° counterclockwise from   
C)   4.2 N at 162° counterclockwise from   
D)   4.2 N at 108° counterclockwise from  " class="answers-bank-image d-inline" rel="preload" >

Question 12

Consider the following figure. Assume the strings and pulleys have negligible masses and the coefficient of kinetic friction between the 2.0 kg block and the table is 0.25. What is the acceleration of the 2.0 kg block?

Accepted Answer

A)   2.5 m/s2
B)   1.7 m/s2
C)   3.2 m/s2
D)   4.0 m/s2

Question 13

The speed for a "low" circular orbit about the Earth is about

Accepted Answer

A)   1.7 × 104 km/s.
B)   7.6 km/s.
C)   2.1 km/s.
D)   2.5 × 104 km/s.
E)   17. km/s.

Question 14

Two cyclists, who weigh the same and have identical bicycles, ride up the same mountain, both starting at the same time. Joe rides straight up the mountain, and Bob rides up the longer road that has a lower grade. Joe gets to the top before Bob. Which statement is true?

Accepted Answer

A)   Ignoring friction and wind resistance, the amount of work done by Joe is equal to the amount of work done by Bob, but the average power exerted by Joe is greater than that of Bob.
B)   Ignoring friction and wind resistance, the amount of work done by Joe is greater than the amount of work done by Bob, and the average power exerted by Joe is greater than that of Bob.
C)   Ignoring friction and wind resistance, Bob and Joe exerted the same amount of work, and the average power of each cyclist was also the same.
D)   Ignoring friction and wind resistance, the average power exerted by Bob and Joe was the same, but Joe exerted more work in getting there.

Question 15

The length of a pendulum changes by thermal expansion. If the length increases by 0.1%, what would be the change in the period?

Accepted Answer

A)   increase by  1.001 \sqrt{1.001} 1.001c-2.7,0,-7.17,-2.7,-13.5,-8c-5.8,-5.3,-9.5,-10,-9.5,-14c0,-2,0.3,-3.3,1,-4c1.3,-2.7,23.83,-20.7,67.5,-54c44.2,-33.3,65.8,-50.3,66.5,-51c1.3,-1.3,3,-2,5,-2c4.7,0,8.7,3.3,12,10s173,378,173,378c0.7,0,35.3,-71,104,-213c68.7,-142,137.5,-285,206.5,-429c69,-144,104.5,-217.7,106.5,-221l0 -0c5.3,-9.3,12,-14,20,-14H400000v40H845.2724s-225.272,467,-225.272,467s-235,486,-235,486c-2.7,4.7,-9,7,-19,7c-6,0,-10,-1,-12,-3s-194,-422,-194,-422s-65,47,-65,47zM834 80h400000v40h-400000z"/>​ 
B)   increase by 0.1%
C)   decrease by 0.1%
D)   decrease by 0.99

Question 16

A dog is standing in the tail bed of a pickup truck. The tail bed is coated with ice, causing the force of friction between the dog and the truck to be zero. The truck is initially at rest, and then accelerates to the right, moving along a flat road. As seen from a stationary observer (watching the truck move to the right), the dog

Accepted Answer

A)   does not move left or right, but simply slides toward the back of the truck.
B)   moves to the right, but not as quickly as the truck is moving to the right, causing it to slide toward the back of the truck.
C)   moves to the right at the same rate as the truck, so it doesn't slide.
D)   moves to the left, as the truck moves to the right, causing the dog to slide toward the back of the truck.

Exam 2: Force and Newtons Laws of Motion, Oscillations, Gravitation, Work and Energy

Consider what happens when you jump up in the air. Which of the following is the most accurate statement?

A leaky faucet drips 40 times in 30.0 s. What is the frequency of the dripping?

At their closest approach, Venus and Earth are 4.20 × 10¹⁰ m apart. The mass of Venus is 4.87 × 10²⁴ kg, the mass of Earth is 5.97 × 10²⁴ kg, and G = 6.67 × 10^-11N · m²/kg/². What is the force exerted by Venus on Earth at that point?

On its own, a tow truck has a maximum acceleration of 3.0 m/s^-2. What would be the maximum acceleration when the truck was towing a bus of twice its own mass?

A 0.25 kg harmonic oscillator has a total oscillation energy of 4.0 J. If the oscillation amplitude is 20.0 cm, what is the oscillation frequency?

The figure shows an object's acceleration-versus-force graph. What is the object's mass in grams?

An object accelerates at 4.1 m/s²under the action of two rubber bands. What will be the object's acceleration if it is pulled by four rubber bands?

The figure shows two forces acting on an object. They have magnitudes F₁ = 6.3 N and F₂ = 2.1 N. What third force will cause the object to be in equilibrium?

Consider the following figure. Assume the strings and pulleys have negligible masses and the coefficient of kinetic friction between the 2.0 kg block and the table is 0.25. What is the acceleration of the 2.0 kg block?

The speed for a "low" circular orbit about the Earth is about

Two cyclists, who weigh the same and have identical bicycles, ride up the same mountain, both starting at the same time. Joe rides straight up the mountain, and Bob rides up the longer road that has a lower grade. Joe gets to the top before Bob. Which statement is true?

The length of a pendulum changes by thermal expansion. If the length increases by 0.1%, what would be the change in the period?

Exam 2: Force and Newtons Laws of Motion, Oscillations, Gravitation, Work and Energy

Consider what happens when you jump up in the air. Which of the following is the most accurate statement?

A leaky faucet drips 40 times in 30.0 s. What is the frequency of the dripping?

At their closest approach, Venus and Earth are 4.20 × 1010 m apart. The mass of Venus is 4.87 × 1024 kg, the mass of Earth is 5.97 × 1024 kg, and G = 6.67 × 10-11 N · m2/kg/2. What is the force exerted by Venus on Earth at that point?

On its own, a tow truck has a maximum acceleration of 3.0 m/s-2. What would be the maximum acceleration when the truck was towing a bus of twice its own mass?

A 0.25 kg harmonic oscillator has a total oscillation energy of 4.0 J. If the oscillation amplitude is 20.0 cm, what is the oscillation frequency?

The figure shows an object's acceleration-versus-force graph. What is the object's mass in grams?

An object accelerates at 4.1 m/s2 under the action of two rubber bands. What will be the object's acceleration if it is pulled by four rubber bands?

The figure shows two forces acting on an object. They have magnitudes F1 = 6.3 N and F2 = 2.1 N. What third force will cause the object to be in equilibrium?

Consider the following figure. Assume the strings and pulleys have negligible masses and the coefficient of kinetic friction between the 2.0 kg block and the table is 0.25. What is the acceleration of the 2.0 kg block?

The speed for a "low" circular orbit about the Earth is about

Two cyclists, who weigh the same and have identical bicycles, ride up the same mountain, both starting at the same time. Joe rides straight up the mountain, and Bob rides up the longer road that has a lower grade. Joe gets to the top before Bob. Which statement is true?

The length of a pendulum changes by thermal expansion. If the length increases by 0.1%, what would be the change in the period?

At their closest approach, Venus and Earth are 4.20 × 10¹⁰ m apart. The mass of Venus is 4.87 × 10²⁴ kg, the mass of Earth is 5.97 × 10²⁴ kg, and G = 6.67 × 10^-11N · m²/kg/². What is the force exerted by Venus on Earth at that point?

On its own, a tow truck has a maximum acceleration of 3.0 m/s^-2. What would be the maximum acceleration when the truck was towing a bus of twice its own mass?

An object accelerates at 4.1 m/s²under the action of two rubber bands. What will be the object's acceleration if it is pulled by four rubber bands?

The figure shows two forces acting on an object. They have magnitudes F₁ = 6.3 N and F₂ = 2.1 N. What third force will cause the object to be in equilibrium?