Exam 2: The Laws of Physics Are Universal Newtonian Mechanics

Car 1 with mass $m$ rounds an unbanked curve of radius $R$ traveling at a constant speed $|\vec{v}|$ . Car 2 with mass $2 m$ rounds a curve of radius $2 R$ traveling at a constant speed $2|\vec{v}|$ . How does the magnitude $\left|\vec{F}_{2}\right|$ of the sideward static friction force acting on car 2 compare with the magnitude $\left|\vec{F}_{1}\right|$ of the sideward static friction force on car 1 ?

(Multiple Choice)

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Question 41

An object travels at a constant speed $|\vec{v}|$ exactly once around a circle of radius $r$ . The magnitude $An object travels at a constant speed |\vec{v}| exactly once around a circle of radius r . The magnitude of the object's average acceleration is:$ of the object's average acceleration is:

(Multiple Choice)

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Question 42

Which of the following pairs of forces are third-law partners? Answer $\mathrm{T}$ if the two forces described are third-law partners, $\mathrm{F}$ if they are not. -A thrust force from its propeller pulls a plane forward; a drag force pushes it backward.

(True/False)

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Question 43

A weight hangs from a string but is pulled to one side by a horizontal string, as shown. The tension force exerted by the angled string is

(Multiple Choice)

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Question 44

The speed of a satellite in a circular orbit of radius $R$ around the earth is $3.0 \mathrm{~km} / \mathrm{s}$ . The speed of another satellite in a different circular orbit around the earth is one-half this value. What is the radius of that satellite's orbit?

(Multiple Choice)

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Question 45

Suppose we throw a baseball with an initial speed of $12 \mathrm{~m} / \mathrm{s}$ in a direction $60^{\circ}$ upward from the horizontal. What is the baseball's speed at the peak of its trajectory? (Hint: You do not need to do a lot of calculating here.)

(Multiple Choice)

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Question 46

Putting wider tires on your car will clearly give you more traction.

(True/False)

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Question 47

A satellite orbits the earth once every $2.0 \mathrm{~h}$ . What is the orbital period of another satellite whose orbital radius is 4.0 times larger?

(Multiple Choice)

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Question 48

Suppose you throw a ball vertically into the air. At the exact instant that the ball reaches its highest position, select from the choices below the most accurate description of -The net external force on the ball.

(Multiple Choice)

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Question 49

Consider the glider described in problem N10T.4. Its phase rate is

(Multiple Choice)

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Question 50

If a car has an $x$ -acceleration of $a_{x}(t)=-b t+c$ , and its initial $x$ -velocity at time $t=0$ is $v_{x}(0)=v_{0}$ , which function below best describes $v_{x}(t)$ ?

(Multiple Choice)

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Question 51

The diagram below shows a top view of the moon's nearly circular orbit around the earth. The moon orbits the earth at a nearly constant speed. At the point shown, use the arrow choices shown to the right to indicate the direction of -The gravitational force on the moon due to the earth.

(Short Answer)

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Question 52

A crate is sliding down a $30^{\circ}$ incline, picking up speed as it slides. Ignore air friction. -(a) Which of the forces listed below that acts on the crate has the greatest magnitude?

(Multiple Choice)

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Question 53

The sun's mass is about 1000 times that of Jupiter, and the radius of Jupiter's orbit is about 1100 times the sun's radius. The center of mass of the sun/Jupiter system is inside the sun.

(True/False)

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Question 54

An elevator moves downward with an acceleration of $6.2 \mathrm{~m} / \mathrm{s}^{2}$ . A ball dropped from rest by a passenger will have what downward acceleration relative to the elevator?

(Multiple Choice)

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Question 55

Suppose a satellite orbits the earth so closely that it experiences some drag due to the earth's upper atmosphere. This will drain away some of the orbital energy of this system, converting it to thermal energy. If this happens fairly slowly, the satellite's orbit will remain nearly circular. What happens to the radius of this satellite's orbit as time passes in this case?

(Multiple Choice)

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Question 56

A spaceship with a mass of $20,000 \mathrm{~kg}$ is traveling in a straight line at a constant speed of $300 \mathrm{~km} / \mathrm{s}$ in deep space. Its rockets engines must be:

(Multiple Choice)

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Question 57

A car passes a dip in the road, going first down, then up. At the very bottom of the dip, when the car's instantaneous velocity is passing through horizontal, how does the magnitude of the normal force on the car compare to the magnitude of the car's weight?

(Multiple Choice)

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Question 58

Which of the following pairs of forces are third-law partners? Answer $\mathrm{T}$ if the two forces described are third-law partners, $\mathrm{F}$ if they are not. -A car exerts a forward force on a trailer; the trailer tugs backward on the car.

(True/False)

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Question 59

An object falling vertically at a speed of $20 \mathrm{~m} / \mathrm{s}$ lands in a snowbank and comes to rest $0.5 \mathrm{~s}$ later. The object's average acceleration during this interval is

(Multiple Choice)

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Question 60

Showing 41 - 60 of 147

An object travels at a constant speed $|\vec{v}|$ exactly once around a circle of radius $r$ . The magnitude $An object travels at a constant speed |\vec{v}| exactly once around a circle of radius r . The magnitude of the object's average acceleration is:$ of the object's average acceleration is:

Which of the following pairs of forces are third-law partners? Answer $\mathrm{T}$ if the two forces described are third-law partners, $\mathrm{F}$ if they are not. -A thrust force from its propeller pulls a plane forward; a drag force pushes it backward.

A weight hangs from a string but is pulled to one side by a horizontal string, as shown. The tension force exerted by the angled string is

The speed of a satellite in a circular orbit of radius $R$ around the earth is $3.0 \mathrm{~km} / \mathrm{s}$ . The speed of another satellite in a different circular orbit around the earth is one-half this value. What is the radius of that satellite's orbit?

Suppose we throw a baseball with an initial speed of $12 \mathrm{~m} / \mathrm{s}$ in a direction $60^{\circ}$ upward from the horizontal. What is the baseball's speed at the peak of its trajectory? (Hint: You do not need to do a lot of calculating here.)

Putting wider tires on your car will clearly give you more traction.

A satellite orbits the earth once every $2.0 \mathrm{~h}$ . What is the orbital period of another satellite whose orbital radius is 4.0 times larger?

Suppose you throw a ball vertically into the air. At the exact instant that the ball reaches its highest position, select from the choices below the most accurate description of -The net external force on the ball.

Consider the glider described in problem N10T.4. Its phase rate is

If a car has an $x$ -acceleration of $a_{x}(t)=-b t+c$ , and its initial $x$ -velocity at time $t=0$ is $v_{x}(0)=v_{0}$ , which function below best describes $v_{x}(t)$ ?

The diagram below shows a top view of the moon's nearly circular orbit around the earth. The moon orbits the earth at a nearly constant speed. At the point shown, use the arrow choices shown to the right to indicate the direction of -The gravitational force on the moon due to the earth.

A crate is sliding down a $30^{\circ}$ incline, picking up speed as it slides. Ignore air friction. -(a) Which of the forces listed below that acts on the crate has the greatest magnitude?

The sun's mass is about 1000 times that of Jupiter, and the radius of Jupiter's orbit is about 1100 times the sun's radius. The center of mass of the sun/Jupiter system is inside the sun.

An elevator moves downward with an acceleration of $6.2 \mathrm{~m} / \mathrm{s}^{2}$ . A ball dropped from rest by a passenger will have what downward acceleration relative to the elevator?

A spaceship with a mass of $20,000 \mathrm{~kg}$ is traveling in a straight line at a constant speed of $300 \mathrm{~km} / \mathrm{s}$ in deep space. Its rockets engines must be:

A car passes a dip in the road, going first down, then up. At the very bottom of the dip, when the car's instantaneous velocity is passing through horizontal, how does the magnitude of the normal force on the car compare to the magnitude of the car's weight?

Which of the following pairs of forces are third-law partners? Answer $\mathrm{T}$ if the two forces described are third-law partners, $\mathrm{F}$ if they are not. -A car exerts a forward force on a trailer; the trailer tugs backward on the car.

An object falling vertically at a speed of $20 \mathrm{~m} / \mathrm{s}$ lands in a snowbank and comes to rest $0.5 \mathrm{~s}$ later. The object's average acceleration during this interval is

Conservation Laws Constrain Interactions

The Laws of Physics Are Frame-Independent Relativity

Electricity and Magnetism Are Unified

Matter Behaves Like Waves Quantum Physics

Some Processes Are Irreversible Thermal Physics

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Exam 2: The Laws of Physics Are Universal Newtonian Mechanics

An object travels at a constant speed ∣v⃗∣|\vec{v}|∣v∣ exactly once around a circle of radius rrr . The magnitude of the object's average acceleration is:

Which of the following pairs of forces are third-law partners? Answer T\mathrm{T}T if the two forces described are third-law partners, F\mathrm{F}F if they are not. -A thrust force from its propeller pulls a plane forward; a drag force pushes it backward.

A weight hangs from a string but is pulled to one side by a horizontal string, as shown. The tension force exerted by the angled string is

The speed of a satellite in a circular orbit of radius RRR around the earth is 3.0 km/s3.0 \mathrm{~km} / \mathrm{s}3.0 km/s . The speed of another satellite in a different circular orbit around the earth is one-half this value. What is the radius of that satellite's orbit?

Suppose we throw a baseball with an initial speed of 12 m/s12 \mathrm{~m} / \mathrm{s}12 m/s in a direction 60∘60^{\circ}60∘ upward from the horizontal. What is the baseball's speed at the peak of its trajectory? (Hint: You do not need to do a lot of calculating here.)

Putting wider tires on your car will clearly give you more traction.

A satellite orbits the earth once every 2.0 h2.0 \mathrm{~h}2.0 h . What is the orbital period of another satellite whose orbital radius is 4.0 times larger?

Suppose you throw a ball vertically into the air. At the exact instant that the ball reaches its highest position, select from the choices below the most accurate description of -The net external force on the ball.

Consider the glider described in problem N10T.4. Its phase rate is

If a car has an xxx -acceleration of ax(t)=−bt+ca_{x}(t)=-b t+cax​(t)=−bt+c , and its initial xxx -velocity at time t=0t=0t=0 is vx(0)=v0v_{x}(0)=v_{0}vx​(0)=v0​ , which function below best describes vx(t)v_{x}(t)vx​(t) ?

The diagram below shows a top view of the moon's nearly circular orbit around the earth. The moon orbits the earth at a nearly constant speed. At the point shown, use the arrow choices shown to the right to indicate the direction of -The gravitational force on the moon due to the earth.

A crate is sliding down a 30∘30^{\circ}30∘ incline, picking up speed as it slides. Ignore air friction. -(a) Which of the forces listed below that acts on the crate has the greatest magnitude?

The sun's mass is about 1000 times that of Jupiter, and the radius of Jupiter's orbit is about 1100 times the sun's radius. The center of mass of the sun/Jupiter system is inside the sun.

An elevator moves downward with an acceleration of 6.2 m/s26.2 \mathrm{~m} / \mathrm{s}^{2}6.2 m/s2 . A ball dropped from rest by a passenger will have what downward acceleration relative to the elevator?

A spaceship with a mass of 20,000 kg20,000 \mathrm{~kg}20,000 kg is traveling in a straight line at a constant speed of 300 km/s300 \mathrm{~km} / \mathrm{s}300 km/s in deep space. Its rockets engines must be:

A car passes a dip in the road, going first down, then up. At the very bottom of the dip, when the car's instantaneous velocity is passing through horizontal, how does the magnitude of the normal force on the car compare to the magnitude of the car's weight?

Which of the following pairs of forces are third-law partners? Answer T\mathrm{T}T if the two forces described are third-law partners, F\mathrm{F}F if they are not. -A car exerts a forward force on a trailer; the trailer tugs backward on the car.

An object falling vertically at a speed of 20 m/s20 \mathrm{~m} / \mathrm{s}20 m/s lands in a snowbank and comes to rest 0.5 s0.5 \mathrm{~s}0.5 s later. The object's average acceleration during this interval is

Conservation Laws Constrain Interactions

The Laws of Physics Are Frame-Independent Relativity

Electricity and Magnetism Are Unified

Matter Behaves Like Waves Quantum Physics

Some Processes Are Irreversible Thermal Physics

Filters

An object travels at a constant speed $|\vec{v}|$ exactly once around a circle of radius $r$ . The magnitude $An object travels at a constant speed |\vec{v}| exactly once around a circle of radius r . The magnitude of the object's average acceleration is:$ of the object's average acceleration is:

Which of the following pairs of forces are third-law partners? Answer $\mathrm{T}$ if the two forces described are third-law partners, $\mathrm{F}$ if they are not. -A thrust force from its propeller pulls a plane forward; a drag force pushes it backward.

The speed of a satellite in a circular orbit of radius $R$ around the earth is $3.0 \mathrm{~km} / \mathrm{s}$ . The speed of another satellite in a different circular orbit around the earth is one-half this value. What is the radius of that satellite's orbit?

Suppose we throw a baseball with an initial speed of $12 \mathrm{~m} / \mathrm{s}$ in a direction $60^{\circ}$ upward from the horizontal. What is the baseball's speed at the peak of its trajectory? (Hint: You do not need to do a lot of calculating here.)

A satellite orbits the earth once every $2.0 \mathrm{~h}$ . What is the orbital period of another satellite whose orbital radius is 4.0 times larger?

If a car has an $x$ -acceleration of $a_{x}(t)=-b t+c$ , and its initial $x$ -velocity at time $t=0$ is $v_{x}(0)=v_{0}$ , which function below best describes $v_{x}(t)$ ?

A crate is sliding down a $30^{\circ}$ incline, picking up speed as it slides. Ignore air friction. -(a) Which of the forces listed below that acts on the crate has the greatest magnitude?

An elevator moves downward with an acceleration of $6.2 \mathrm{~m} / \mathrm{s}^{2}$ . A ball dropped from rest by a passenger will have what downward acceleration relative to the elevator?

A spaceship with a mass of $20,000 \mathrm{~kg}$ is traveling in a straight line at a constant speed of $300 \mathrm{~km} / \mathrm{s}$ in deep space. Its rockets engines must be:

Which of the following pairs of forces are third-law partners? Answer $\mathrm{T}$ if the two forces described are third-law partners, $\mathrm{F}$ if they are not. -A car exerts a forward force on a trailer; the trailer tugs backward on the car.

An object falling vertically at a speed of $20 \mathrm{~m} / \mathrm{s}$ lands in a snowbank and comes to rest $0.5 \mathrm{~s}$ later. The object's average acceleration during this interval is