Exam 2: The Laws of Physics Are Universal Newtonian Mechanics

Suppose you continue to lift the board described in problem N4T.7. Assume that the force you exert is always perpendicular to the board and that one end of the board always remains on the ground. What happens to the magnitude of the force you exert on the end as the angle between the board and the ground increases? It

(Multiple Choice)

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Question 81

The magnitude of the normal force on a box sitting on an incline is equal to that of its weight.

(True/False)

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Question 82

At time $t=0$ a person is sliding due east on a flat, frictionless plane of ice. The net force on this person is due to a battery-powered fan the person holds that exerts a southward thrust force on the person. Assuming that drag is negligible, the eastward component of the person's velocity is unaffected by this force.

(True/False)

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Question 83

Imagine that we launch a spaceship from the earth so its speed is 6 AU/y relative to the earth in the direction that the earth orbits the sun. This spaceship's subsequent orbit around the sun is:

(Multiple Choice)

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Question 84

A child grips tightly the outer edge of a playground merry-go-round as other kids push on it to give it a dizzying rotational velocity. When the other kids let go, the horizontal component of the net force on the child points most nearly

(Multiple Choice)

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Question 85

A comet is discovered in an elliptical orbit around the sun. Its closest distance from the sun is $1.0 \mathrm{AU}$ , and measurements of its speed at this distance imply that its greatest distance from the sun is $7 \mathrm{AU}$ . About how many years will pass between the comet's approaches to the sun?

(Multiple Choice)

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Question 86

Object A $\left(m_{A}=1.0 \mathrm{~kg}\right)$ hangs at rest from an ideal string $A$ connected to the ceiling. Object $B\left(m_{B}=2.0 \mathrm{~kg}\right)$ hangs at rest from an ideal string $B$ connected to object $A$ . The tension on string $A$ is

(Multiple Choice)

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Question 87

A crate is sliding down a $30^{\circ}$ incline, picking up speed as it slides. Ignore air friction. -(c) Which force listed does not actually act on the crate?

(Multiple Choice)

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Question 88

If your car is hit from behind, you are suddenly pressed back into the seat. The normal force that the seat exerts on you is a fictitious force.

(True/False)

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Question 89

A truck is traveling down a steady slope such that for each $1 \mathrm{~m}$ the truck goes forward along the slope it goes down $0.04 \mathrm{~m}$ (we call this a $4 \%$ grade). Imagine that the truck's brakes fail. What is the approximate increase in the truck's speed after $30 \mathrm{~s}$ , assuming that the engine is not used and there is little drag or other friction? $[\vec{g} \mid=$ $22(\mathrm{mi} / \mathrm{h}) / \mathrm{s}$ .]

(Multiple Choice)

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Question 90

When a speeding roller-coaster car is at the bottom of a loop, the magnitude of the normal force exerted on the car's wheels due to its interaction with the track is

(Multiple Choice)

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Question 91

You are pressed downward toward the floor as an elevator begins to move upward. The force pressing you down is a fictitious force.

(True/False)

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Question 92

Consider the person described in problem N3T.6. The person's trajectory will look most like which of the following? (The dot shows the person's position at $t=0$ and east is to the right and north to the top.)

(Multiple Choice)

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Question 93

When is an elevator a reasonably good inertial reference frame?

(Multiple Choice)

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Question 94

As a projectile moves along its parabolic trajectory, which of the following remain constant (ignoring air resistance, and defining the $z$ axis as pointing upward)?

(Multiple Choice)

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Question 95

Two boxes of the same mass sit on a rough floor. These boxes are made of the same kind of cardboard and are identical except that one is twice as large as the other. If it takes $200 \mathrm{~N}$ to start moving the smaller box, how much force does it take to start moving the larger one?

(Multiple Choice)

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Question 96

An orbiting satellite experiences no forces other than the force of gravity. It therefore exhibits simple projectile motion.

(True/False)

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Question 97

A car with four-wheel drive can climb a steeper slope than a car with two-wheel drive.

(True/False)

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Question 98

Consider an asteroid in an elliptical orbit whose closest point to the sun is $r_{c}=1 \mathrm{AU}$ and farthest point is $7 \mathrm{AU}$ from the sun. Its orbital period is

(Multiple Choice)

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Question 99

According to Einstein, is a frame at rest on the earth's surface a reasonably accurate inertial frame (ignoring the earth's rotation)?

(Multiple Choice)

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Question 100

Showing 81 - 100 of 147

The magnitude of the normal force on a box sitting on an incline is equal to that of its weight.

Imagine that we launch a spaceship from the earth so its speed is 6 AU/y relative to the earth in the direction that the earth orbits the sun. This spaceship's subsequent orbit around the sun is:

A child grips tightly the outer edge of a playground merry-go-round as other kids push on it to give it a dizzying rotational velocity. When the other kids let go, the horizontal component of the net force on the child points most nearly

Object A $\left(m_{A}=1.0 \mathrm{~kg}\right)$ hangs at rest from an ideal string $A$ connected to the ceiling. Object $B\left(m_{B}=2.0 \mathrm{~kg}\right)$ hangs at rest from an ideal string $B$ connected to object $A$ . The tension on string $A$ is

A crate is sliding down a $30^{\circ}$ incline, picking up speed as it slides. Ignore air friction. -(c) Which force listed does not actually act on the crate?

If your car is hit from behind, you are suddenly pressed back into the seat. The normal force that the seat exerts on you is a fictitious force.

When a speeding roller-coaster car is at the bottom of a loop, the magnitude of the normal force exerted on the car's wheels due to its interaction with the track is

You are pressed downward toward the floor as an elevator begins to move upward. The force pressing you down is a fictitious force.

Consider the person described in problem N3T.6. The person's trajectory will look most like which of the following? (The dot shows the person's position at $t=0$ and east is to the right and north to the top.)

When is an elevator a reasonably good inertial reference frame?

As a projectile moves along its parabolic trajectory, which of the following remain constant (ignoring air resistance, and defining the $z$ axis as pointing upward)?

Two boxes of the same mass sit on a rough floor. These boxes are made of the same kind of cardboard and are identical except that one is twice as large as the other. If it takes $200 \mathrm{~N}$ to start moving the smaller box, how much force does it take to start moving the larger one?

An orbiting satellite experiences no forces other than the force of gravity. It therefore exhibits simple projectile motion.

A car with four-wheel drive can climb a steeper slope than a car with two-wheel drive.

Consider an asteroid in an elliptical orbit whose closest point to the sun is $r_{c}=1 \mathrm{AU}$ and farthest point is $7 \mathrm{AU}$ from the sun. Its orbital period is

According to Einstein, is a frame at rest on the earth's surface a reasonably accurate inertial frame (ignoring the earth's rotation)?

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

The magnitude of the normal force on a box sitting on an incline is equal to that of its weight.

Imagine that we launch a spaceship from the earth so its speed is 6 AU/y relative to the earth in the direction that the earth orbits the sun. This spaceship's subsequent orbit around the sun is:

A child grips tightly the outer edge of a playground merry-go-round as other kids push on it to give it a dizzying rotational velocity. When the other kids let go, the horizontal component of the net force on the child points most nearly

Object A (mA=1.0 kg)\left(m_{A}=1.0 \mathrm{~kg}\right)(mA​=1.0 kg) hangs at rest from an ideal string AAA connected to the ceiling. Object B(mB=2.0 kg)B\left(m_{B}=2.0 \mathrm{~kg}\right)B(mB​=2.0 kg) hangs at rest from an ideal string BBB connected to object AAA . The tension on string AAA is

A crate is sliding down a 30∘30^{\circ}30∘ incline, picking up speed as it slides. Ignore air friction. -(c) Which force listed does not actually act on the crate?

If your car is hit from behind, you are suddenly pressed back into the seat. The normal force that the seat exerts on you is a fictitious force.

When a speeding roller-coaster car is at the bottom of a loop, the magnitude of the normal force exerted on the car's wheels due to its interaction with the track is

You are pressed downward toward the floor as an elevator begins to move upward. The force pressing you down is a fictitious force.

Consider the person described in problem N3T.6. The person's trajectory will look most like which of the following? (The dot shows the person's position at t=0t=0t=0 and east is to the right and north to the top.)

When is an elevator a reasonably good inertial reference frame?

As a projectile moves along its parabolic trajectory, which of the following remain constant (ignoring air resistance, and defining the zzz axis as pointing upward)?

Two boxes of the same mass sit on a rough floor. These boxes are made of the same kind of cardboard and are identical except that one is twice as large as the other. If it takes 200 N200 \mathrm{~N}200 N to start moving the smaller box, how much force does it take to start moving the larger one?

An orbiting satellite experiences no forces other than the force of gravity. It therefore exhibits simple projectile motion.

A car with four-wheel drive can climb a steeper slope than a car with two-wheel drive.

Consider an asteroid in an elliptical orbit whose closest point to the sun is rc=1AUr_{c}=1 \mathrm{AU}rc​=1AU and farthest point is 7AU7 \mathrm{AU}7AU from the sun. Its orbital period is

According to Einstein, is a frame at rest on the earth's surface a reasonably accurate inertial frame (ignoring the earth's rotation)?

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

Object A $\left(m_{A}=1.0 \mathrm{~kg}\right)$ hangs at rest from an ideal string $A$ connected to the ceiling. Object $B\left(m_{B}=2.0 \mathrm{~kg}\right)$ hangs at rest from an ideal string $B$ connected to object $A$ . The tension on string $A$ is

A crate is sliding down a $30^{\circ}$ incline, picking up speed as it slides. Ignore air friction. -(c) Which force listed does not actually act on the crate?

Consider the person described in problem N3T.6. The person's trajectory will look most like which of the following? (The dot shows the person's position at $t=0$ and east is to the right and north to the top.)

As a projectile moves along its parabolic trajectory, which of the following remain constant (ignoring air resistance, and defining the $z$ axis as pointing upward)?

Two boxes of the same mass sit on a rough floor. These boxes are made of the same kind of cardboard and are identical except that one is twice as large as the other. If it takes $200 \mathrm{~N}$ to start moving the smaller box, how much force does it take to start moving the larger one?

Consider an asteroid in an elliptical orbit whose closest point to the sun is $r_{c}=1 \mathrm{AU}$ and farthest point is $7 \mathrm{AU}$ from the sun. Its orbital period is