Question 1

The length C of the longest side of a right triangle is related to the lengths A and B of the other sides by the formula

Accepted Answer

A) C = A + B. 
B) C = A2 + B2. 
C)    . 
D)    . 
A) C = A + B. 
B) C = A2 + B2. 
C)    . 
D)    .

Question 2

A car whose speed is a steady 50 km/h

Accepted Answer

A) cannot be accelerated. 
B) is accelerated when it climbs a hill. 
C) is accelerated when it descends a hill. 
D) is accelerated when it climbs a hill, goes over the crest, and descends on the other side. 
A) cannot be accelerated. 
B) is accelerated when it climbs a hill. 
C) is accelerated when it descends a hill. 
D) is accelerated when it climbs a hill, goes over the crest, and descends on the other side.

Question 3

A woman whose mass is 60 kg on the earth's surface is in a spacecraft at a height of 2 earth radii above the earth's surface.Her mass there is

Accepted Answer

A) 6.7 kg. 
B) 15 kg. 
C) 20 kg. 
D) 60 kg. 
A) 6.7 kg. 
B) 15 kg. 
C) 20 kg. 
D) 60 kg.

Question 4

A car starts from a speed of 10 m/s with an acceleration of 2 m/s2.The time needed for the car to reach 30 m/s is

Accepted Answer

A) 10 s. 
B) 20 s. 
C) 30 s. 
D) 40 s. 
A) 10 s. 
B) 20 s. 
C) 30 s. 
D) 40 s.

Question 5

A jumper whose weight is w presses down on the floor with the force F and leaves the floor as a result. The force the floor exerted on the jumper was

Accepted Answer

A)  equal to w and less than F. 
B)  equal to w and equal to F. 
C)  more than w and equal to F. 
D)  more than w and more than F. 
A)  equal to w and less than F. 
B)  equal to w and equal to F. 
C)  more than w and equal to F. 
D)  more than w and more than F.

Question 6

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) 25 m. 
C) 55 m. 
D) 65 m. 
A) 15 m. 
B) 25 m. 
C) 55 m. 
D) 65 m.

Question 7

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 8

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.

Question 9

A car that starts from rest with a constant acceleration travels 50 m in the first 5 s.The car's acceleration is

Accepted Answer

A) 2 m/s2. 
B) 4 m/s2. 
C) 10 m/s2. 
D) 20 m/s2. 
A) 2 m/s2. 
B) 4 m/s2. 
C) 10 m/s2. 
D) 20 m/s2.

Question 10

A man whose mass is 80 kg on the earth's surface is in a spacecraft at a height of 2 earth radii above the earth's surface.His weight there is

Accepted Answer

A) 87 N. 
B) 196 N. 
C) 261 N. 
D) 784 N. 
A) 87 N. 
B) 196 N. 
C) 261 N. 
D) 784 N.

Question 11

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 12

A 50-kg person weighs

Accepted Answer

A) 5.1 N. 
B) 23 N. 
C) 110 N. 
D) 490 N. 
A) 5.1 N. 
B) 23 N. 
C) 110 N. 
D) 490 N.

Question 13

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 14

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 15

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 16

A 1200-kg car is traveling at 10 m/s on a road such that the maximum frictional force between its tires and the road is 4000 N.The minimum turning radius of the car is

Accepted Answer

A) 15 m. 
B) 30 m. 
C) 60 m. 
D) 120 m. 
A) 15 m. 
B) 30 m. 
C) 60 m. 
D) 120 m.

Question 17

When a 430-g soccer ball is kicked, the impact lasts for 0.04 s.In order for the ball to fly off at 8 m/s, the force of the kick must be

Accepted Answer

A) 86 N. 
B) 138 N. 
C) 178 N. 
D) 86 kN. 
A) 86 N. 
B) 138 N. 
C) 178 N. 
D) 86 kN.

Question 18

The radius of the path of an object moving in a circle at constant speed is halved.If the speed remains the same, the centripetal force needed is

Accepted Answer

A) one-quarter as much as before. 
B) half as much as before. 
C) twice as much as before. 
D) four times as much as before. 
A) one-quarter as much as before. 
B) half as much as before. 
C) twice as much as before. 
D) four times as much as before.

Question 19

An airplane reaches its takeoff speed of 60 m/s in 30 s starting from rest.The time it spends in going from 40 m/s to 60 m/s is

Accepted Answer

A) 10 s. 
B) 15 s. 
C) 20 s. 
D) 25 s. 
A) 10 s. 
B) 15 s. 
C) 20 s. 
D) 25 s.

Question 20

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.

The length C of the longest side of a right triangle is related to the lengths A and B of the other sides by the formula

A car whose speed is a steady 50 km/h

A woman whose mass is 60 kg on the earth's surface is in a spacecraft at a height of 2 earth radii above the earth's surface.Her mass there is

A car starts from a speed of 10 m/s with an acceleration of 2 m/s².The time needed for the car to reach 30 m/s is

A jumper whose weight is w presses down on the floor with the force F and leaves the floor as a result. The force the floor exerted on the jumper was

A car moving at 10 m/s undergoes an acceleration of 1.2 m/s².In the next 5 s the car travels

An object moving in a circle at constant speed is accelerated

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

A car that starts from rest with a constant acceleration travels 50 m in the first 5 s.The car's acceleration is

A man whose mass is 80 kg on the earth's surface is in a spacecraft at a height of 2 earth radii above the earth's surface.His weight there 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

A 50-kg person weighs

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 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

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 1200-kg car is traveling at 10 m/s on a road such that the maximum frictional force between its tires and the road is 4000 N.The minimum turning radius of the car is

When a 430-g soccer ball is kicked, the impact lasts for 0.04 s.In order for the ball to fly off at 8 m/s, the force of the kick must be

The radius of the path of an object moving in a circle at constant speed is halved.If the speed remains the same, the centripetal force needed is

An airplane reaches its takeoff speed of 60 m/s in 30 s starting from rest.The time it spends in going from 40 m/s to 60 m/s is

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 Scientific Method

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Energy and the Future

Matter and Heat

Electricity and Magnetism

Waves

The Nucleus

The Atom

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Exam 2: Motion

The length C of the longest side of a right triangle is related to the lengths A and B of the other sides by the formula

A car whose speed is a steady 50 km/h

A woman whose mass is 60 kg on the earth's surface is in a spacecraft at a height of 2 earth radii above the earth's surface.Her mass there is

A car starts from a speed of 10 m/s with an acceleration of 2 m/s2.The time needed for the car to reach 30 m/s is

A jumper whose weight is w presses down on the floor with the force F and leaves the floor as a result. The force the floor exerted on the jumper was

A car moving at 10 m/s undergoes an acceleration of 1.2 m/s2.In the next 5 s the car travels

An object moving in a circle at constant speed is accelerated

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

A car that starts from rest with a constant acceleration travels 50 m in the first 5 s.The car's acceleration is

A man whose mass is 80 kg on the earth's surface is in a spacecraft at a height of 2 earth radii above the earth's surface.His weight there 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

A 50-kg person weighs

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 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

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 1200-kg car is traveling at 10 m/s on a road such that the maximum frictional force between its tires and the road is 4000 N.The minimum turning radius of the car is

When a 430-g soccer ball is kicked, the impact lasts for 0.04 s.In order for the ball to fly off at 8 m/s, the force of the kick must be

The radius of the path of an object moving in a circle at constant speed is halved.If the speed remains the same, the centripetal force needed is

An airplane reaches its takeoff speed of 60 m/s in 30 s starting from rest.The time it spends in going from 40 m/s to 60 m/s is

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 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

Filters

A car starts from a speed of 10 m/s with an acceleration of 2 m/s².The time needed for the car to reach 30 m/s is

A car moving at 10 m/s undergoes an acceleration of 1.2 m/s².In the next 5 s the car travels