Question 1

A ball thrown upward at 30 m/s will continue to rise for about rev:

Accepted Answer

A)  0.5 s. 
B)  1.0 s. 
C)  3.0 s. 
D)  4.0 s. 
A)  0.5 s. 
B)  1.0 s. 
C)  3.0 s. 
D)  4.0 s.

Question 2

The escape speed needed for an object to leave the earth permanently

Accepted Answer

A)  depends on its mass. 
B)  is less than the minimum speed it needs to become an earth satellite. 
C)  is equal to the minimum speed it needs to become an earth satellite. 
D)  is more than the minimum speed it needs to become an earth satellite. 
A)  depends on its mass. 
B)  is less than the minimum speed it needs to become an earth satellite. 
C)  is equal to the minimum speed it needs to become an earth satellite. 
D)  is more than the minimum speed it needs to become an earth satellite.

Question 3

A ball of mass 200 g is whirled in a circle at the end of a string 100 cm long whose breaking strength is 10 N. Neglecting gravity, the maximum speed of the ball is approximately

Accepted Answer

A)  2 m/s. 
B)  7 m/s. 
C)  10 m/s. 
D)  50 m/s. 
A)  2 m/s. 
B)  7 m/s. 
C)  10 m/s. 
D)  50 m/s.

Question 4

A snail travels 45 cm in 20 min. Its average speed is

Accepted Answer

A)  2.25 cm/h. 
B)  15 cm/h. 
C)  90 cm/h. 
D)  135 cm/h. 
A)  2.25 cm/h. 
B)  15 cm/h. 
C)  90 cm/h. 
D)  135 cm/h.

Question 5

Mars is about 1.5 times as far from the sun as the earth and its mass is about 0.1 times the earth's mass. Relative to the gravitational force the sun exerts on the earth, the force it exerts on Mars is about

Accepted Answer

A)  0.0044 as much. 
B)  0.0067 as much. 
C)  0.044 as much. 
D)  0.067 as much. 
A)  0.0044 as much. 
B)  0.0067 as much. 
C)  0.044 as much. 
D)  0.067 as much.

Question 6

When its brakes are applied, a car moving at 10 m/s undergoes an acceleration of -1.2 m/s2. In the next 5 s the car travels

Accepted Answer

A)  15 m. 
B)  32 m. 
C)  35 m. 
D)  47 m. 
A)  15 m. 
B)  32 m. 
C)  35 m. 
D)  47 m.

Question 7

A 300-g ball is struck with a bat with a force of 150 N. If the bat was in contact with the ball for 0.02 s, the ball flew off at

Accepted Answer

A)  0.01 m/s. 
B)  0.1 m/s. 
C)  2.5 m/s. 
D)  10 m/s. 
A)  0.01 m/s. 
B)  0.1 m/s. 
C)  2.5 m/s. 
D)  10 m/s.

Question 8

A ship travels 20 km to the south and then 40 km to the west. The ship's displacement from its starting point is

Accepted Answer

A)  20 km. 
B)  40 km. 
C)  45 km. 
D)  60 km. 
A)  20 km. 
B)  40 km. 
C)  45 km. 
D)  60 km.

Question 9

The weight of an object is

Accepted Answer

A)  the same everywhere on the earth's surface. 
B)  greater at the poles than at the equator. 
C)  less at the poles than at the equator. 
D)  Any of these choices, depending on the phase of the moon. 
A)  the same everywhere on the earth's surface. 
B)  greater at the poles than at the equator. 
C)  less at the poles than at the equator. 
D)  Any of these choices, depending on the phase of the moon.

Question 10

A net force of 10 N gives an object an acceleration of 5 m/s2. What net force would give the same object an acceleration of 1 m/s2?

Accepted Answer

A)  1 N 
B)  2 N 
C)  5 N 
D)  50 N 
A)  1 N 
B)  2 N 
C)  5 N 
D)  50 N

Question 11

A car whose mass is 1600 kg including the driver) has a maximum acceleration of 1.2 m/s2. If three 80-kg passengers are also in the car, its maximum acceleration will be

Accepted Answer

A)  0.5 m/s2. 
B)  0.72 m/s2. 
C)  1.04 m/s2. 
D)  1.2 m/s2. 
A)  0.5 m/s2. 
B)  0.72 m/s2. 
C)  1.04 m/s2. 
D)  1.2 m/s2.

Question 12

A car moving at 15 m/s comes to a stop in 3 s. Its acceleration is

Accepted Answer

A)  -0.2 m/s2. 
B)  -5 m/s2. 
C)  -15 m/s2. 
D)  -45 m/s2. 
A)  -0.2 m/s2. 
B)  -5 m/s2. 
C)  -15 m/s2. 
D)  -45 m/s2.

Question 13

An object moving in a circle at constant speed is accelerated

Accepted Answer

A)  in the direction of its motion. 
B)  toward the center of the circle. 
C)  away from the center of the circle. 
D)  Any of these choices, depending on the circumstances. 
A)  in the direction of its motion. 
B)  toward the center of the circle. 
C)  away from the center of the circle. 
D)  Any of these choices, depending on the circumstances.

Question 14

The mass of a sack of potatoes whose weight is 200 N is

Accepted Answer

A)  20.4 kg. 
B)  91 kg. 
C)  210 kg. 
D)  440 kg. 
A)  20.4 kg. 
B)  91 kg. 
C)  210 kg. 
D)  440 kg.

Question 15

A car starts from rest and reaches a speed of 15 m/s in 10s. Its acceleration is

Accepted Answer

A)  0.67 m/s2. 
B)  1.5 m/s2. 
C)  6.7 m/s2. 
D)  15 m/s2. 
A)  0.67 m/s2. 
B)  1.5 m/s2. 
C)  6.7 m/s2. 
D)  15 m/s2.

Question 16

A 3000-kg truck accelerates from 10 m/s to 30 m/s in 8 s. The net force on the truck is

Accepted Answer

A)  765 N. 
B)  7500 N. 
C)  11,250 N. 
D)  15,000 N. 
A)  765 N. 
B)  7500 N. 
C)  11,250 N. 
D)  15,000 N.

Question 17

The braking force needed to bring a 4000-kg truck to a stop from a speed of 20 m/s in 5 s is

Accepted Answer

A)  1000 N. 
B)  1633 N. 
C)  9800 N. 
D)  16,000 N. 
A)  1000 N. 
B)  1633 N. 
C)  9800 N. 
D)  16,000 N.

Question 18

A net horizontal force of 2000 N is applied to an 800-kg car at rest. The car's speed after 5 s will be

Accepted Answer

A)  1.3 m/s. 
B)  2.5 m/s. 
C)  6.25 m/s. 
D)  12.5 m/s. 
A)  1.3 m/s. 
B)  2.5 m/s. 
C)  6.25 m/s. 
D)  12.5 m/s.

Question 19

A boat whose velocity through the water is 20 km/h is moving in a river whose current is 6 km/in relative to the riverbed. The velocity of the boat relative to the riverbed must be between

Accepted Answer

A)  6 and 20 km/h. 
B)  6 and 26 km/h. 
C)  12 and 20 km/h. 
D)  12 and 26 km/h. 
A)  6 and 20 km/h. 
B)  6 and 26 km/h. 
C)  12 and 20 km/h. 
D)  12 and 26 km/h.

A ball thrown upward at 30 m/s will continue to rise for about rev:

The escape speed needed for an object to leave the earth permanently

A ball of mass 200 g is whirled in a circle at the end of a string 100 cm long whose breaking strength is 10 N. Neglecting gravity, the maximum speed of the ball is approximately

A snail travels 45 cm in 20 min. Its average speed is

Mars is about 1.5 times as far from the sun as the earth and its mass is about 0.1 times the earth's mass. Relative to the gravitational force the sun exerts on the earth, the force it exerts on Mars is about

When its brakes are applied, a car moving at 10 m/s undergoes an acceleration of -1.2 m/s². In the next 5 s the car travels

A 300-g ball is struck with a bat with a force of 150 N. If the bat was in contact with the ball for 0.02 s, the ball flew off at

A ship travels 20 km to the south and then 40 km to the west. The ship's displacement from its starting point is

The weight of an object is

A net force of 10 N gives an object an acceleration of 5 m/s². What net force would give the same object an acceleration of 1 m/s²?

A car whose mass is 1600 kg including the driver) has a maximum acceleration of 1.2 m/s². If three 80-kg passengers are also in the car, its maximum acceleration will be

A car moving at 15 m/s comes to a stop in 3 s. Its acceleration is

An object moving in a circle at constant speed is accelerated

The mass of a sack of potatoes whose weight is 200 N is

A car starts from rest and reaches a speed of 15 m/s in 10s. Its acceleration is

A 3000-kg truck accelerates from 10 m/s to 30 m/s in 8 s. The net force on the truck is

The braking force needed to bring a 4000-kg truck to a stop from a speed of 20 m/s in 5 s is

A net horizontal force of 2000 N is applied to an 800-kg car at rest. The car's speed after 5 s will be

A boat whose velocity through the water is 20 km/h is moving in a river whose current is 6 km/in relative to the riverbed. The velocity of the boat relative to the riverbed must be between

The Scientific Method

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Exam 2: Motion

A ball thrown upward at 30 m/s will continue to rise for about rev:

The escape speed needed for an object to leave the earth permanently

A ball of mass 200 g is whirled in a circle at the end of a string 100 cm long whose breaking strength is 10 N. Neglecting gravity, the maximum speed of the ball is approximately

A snail travels 45 cm in 20 min. Its average speed is

Mars is about 1.5 times as far from the sun as the earth and its mass is about 0.1 times the earth's mass. Relative to the gravitational force the sun exerts on the earth, the force it exerts on Mars is about

When its brakes are applied, a car moving at 10 m/s undergoes an acceleration of -1.2 m/s2. In the next 5 s the car travels

A 300-g ball is struck with a bat with a force of 150 N. If the bat was in contact with the ball for 0.02 s, the ball flew off at

A ship travels 20 km to the south and then 40 km to the west. The ship's displacement from its starting point is

The weight of an object is

A net force of 10 N gives an object an acceleration of 5 m/s2. What net force would give the same object an acceleration of 1 m/s2?

A car whose mass is 1600 kg including the driver) has a maximum acceleration of 1.2 m/s2. If three 80-kg passengers are also in the car, its maximum acceleration will be

A car moving at 15 m/s comes to a stop in 3 s. Its acceleration is

An object moving in a circle at constant speed is accelerated

The mass of a sack of potatoes whose weight is 200 N is

A car starts from rest and reaches a speed of 15 m/s in 10s. Its acceleration is

A 3000-kg truck accelerates from 10 m/s to 30 m/s in 8 s. The net force on the truck is

The braking force needed to bring a 4000-kg truck to a stop from a speed of 20 m/s in 5 s is

A net horizontal force of 2000 N is applied to an 800-kg car at rest. The car's speed after 5 s will be

A boat whose velocity through the water is 20 km/h is moving in a river whose current is 6 km/in relative to the riverbed. The velocity of the boat relative to the riverbed must be between

The Scientific Method

Energy

Energy and the Future

Matter and Heat

Electricity and Magnetism

Waves

The Nucleus

The Atom

The Periodic Law

Crystals, Ions, and Solutions

Chemical Reactions

Organic Chemistry

Atmosphere and Hydrosphere

The Rock Cycle

The Evolving Earth

The Solar System

The Stars

The Universe Galaxies

Filters

When its brakes are applied, a car moving at 10 m/s undergoes an acceleration of -1.2 m/s². In the next 5 s the car travels

A net force of 10 N gives an object an acceleration of 5 m/s². What net force would give the same object an acceleration of 1 m/s²?

A car whose mass is 1600 kg including the driver) has a maximum acceleration of 1.2 m/s². If three 80-kg passengers are also in the car, its maximum acceleration will be