Mechanical comprehension test | 暗記メーカー

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Mechanical comprehension test

30問 • 1年前

ユーザ名非公開

問題一覧

1

The work required to lift an object is the same as:

the change in potential energy of the object

2

A constant force of 2 N is applied to a mass of 6 kg that is initially at rest for 3 seconds. Assuming there is no friction or any other force applied to the mass, what is the velocity of the mass after 3 seconds?

1.0 m/s

3

Approximately how much force is needed to lift the weight below?

12lbs

4

If a ball is dropped from a height of 5 m, what will be its approximate speed when it hits the ground?

10 m/s

5

Adam's car is stuck in the mud, so he recruits some friends to help push it out. If they apply 2,000 N of force to push the car 5 m, how much work did they accomplish?

10,000 j

6

A machine in an assembly plant lifts parts weighing 10 N each from the floor to a height of 2 m. If this machine must lift batches of 20 parts at a time in 2 seconds, what amount of power is required?

200 watts

7

A man who weighs 900 N wants to compress some loose soil in his garden, so he puts a thick plate that is m wide and m long on the ground and stands on the plate. Assuming the plate distributes his weight evenly, how much pressure is applied to the soil?

2400 n/m2

8

Gear A has 15 teeth, and Gear B has 10. 1f gear A makes 14 revolutions, how many will gear B make?

21

9

Two wheels are secured to a common axle. If the larger wheel has a radius of m and the smaller wheel has a diameter of m, what is the mechanical advantage of a force applied to the larger wheel?

10 to 1

10

A basic kitchen knife, like the one below, is based on which of the following simple machines?

wedge

11

How much force is needed to apply 50 ft-lb of torque to a bolt using a 2 ft-long wrench?

25 pounds

12

If a 10 N force applied to an object produces an acceleration of 10 m/s2, assuming friction is NOT negligible, what could the object's mass have been?

less than 1 kg

13

The force of friction between two surfaces moving past each other DOES NOT depend on

the speed at which the surfaces are moving past each other

14

The gravitational acceleration on Earth, g, is 9.8 m/s2. The gravitational acceleration on a neighboring planet, Xendor, is 3 times as much. What is the approximate weight of a 100 kg person on Xendor? (Hint: you can approximate the gravitational acceleration on Earth as 10 m/s2 to make calculations easier.)

3,000 N

15

Assuming no friction, if 80J of work was done to move an object 2 m, what was the net force that was applied?

40 N

16

A man pushes against an object at rest but fails to get it moving. Which of the following must be true about the th relationship between the applied force and the force of friction?

The applied force is equal to the force of static friction.

17

A ball with a mass of 10 kg starts rolling down a hill 20 m high. What is its approximate velocity when it hits the bottom, ignoring resistance?

20 m/s

18

A 500 g block made from a uniform material is suspended from the ceiling by two equal-length ropes equidistant from the center of the block, as depicted in the figure below. Which of the following best approximates the tension in rope 1 (T1)?

2.5 N

19

A hydraulic lift is set up as depicted below. Which of the following must be true

To do the same amount of work, Force 2 must be smaller than Force 1 but applied over a larger distance.

20

Two weights, one with a mass of 10 kg and another with a mass of 20 kg, are placed on opposite ends of a 9 m rod. To achieve rotational equilibrium, what distance must the fulcrum be placed from the 10 kg weight?

6.0 m

21

What is the kinetic energy of a 98 N object moving at 100 m/s?

50,000 J

22

A man pushes a 50 kg block at a distance of 10 meters in 20 seconds with a force of 100 N. How much power did he exert?

50 w

23

Based on the diagram below, approximately what minimum force must be applied to the rope to lift the object?

250 N

24

Snowshoes reduce the pressure exerted by the feet when walking on top of deep snow. A 150 lb woman puts on two rectangular snowshoes with dimensions 10 inches by 15 inches each. What pressure does the woman exert on the snow while both shoes equally bear her full weight?

0.5 psi

25

A 40 kg block is sitting on a table, and it is also pushed down by a 100 N force. What is the magnitude of the normal force provided by the table if the object remains at rest? (Use 10 m/s2 for gravity.)

500 N

26

A ball with a mass of 5 kg is thrown from a height of 10 meters at an angle of 30° above the horizontal with an initial velocity of 10 m/s. Consider any resistance to be negligible. What is the approximate total kinetic energy when the ball hits the ground?

750 J

27

Which of the answer choices best describes the topics that are included in the area of physics known as "mechanics?"

the laws of motion, energy, and forces

28

Once sufficient force is applied to a stationary object to overcome static friction, the object will accelerate if the same force is maintained. This is true because____.

the coefficient of static friction is greater than the coefficient of kinetic friction

29

Playground seesaws are constructed in the same way as first-class levers. A boy wants to play on the seesaw with his little brother. The big brother weighs 100 pounds; the little brother weighs 75 pounds and sits 8 feet from the seesaw's center. For the two brothers to be balanced, how far from the center of the seesaw should the big brother sit?

6.0 feet

30

A hydraulic lift has a 2 cm diameter piston that exerts a downward force of 20 N on the incompressible fluid in a closed system. If the piston that is at the other end has a diameter of 20 cm, how much upward force can it exert?

2,000 N

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問題一覧

1

The work required to lift an object is the same as:

the change in potential energy of the object

2

A constant force of 2 N is applied to a mass of 6 kg that is initially at rest for 3 seconds. Assuming there is no friction or any other force applied to the mass, what is the velocity of the mass after 3 seconds?

1.0 m/s

3

Approximately how much force is needed to lift the weight below?

12lbs

4

If a ball is dropped from a height of 5 m, what will be its approximate speed when it hits the ground?

10 m/s

5

Adam's car is stuck in the mud, so he recruits some friends to help push it out. If they apply 2,000 N of force to push the car 5 m, how much work did they accomplish?

10,000 j

6

A machine in an assembly plant lifts parts weighing 10 N each from the floor to a height of 2 m. If this machine must lift batches of 20 parts at a time in 2 seconds, what amount of power is required?

200 watts

7

A man who weighs 900 N wants to compress some loose soil in his garden, so he puts a thick plate that is m wide and m long on the ground and stands on the plate. Assuming the plate distributes his weight evenly, how much pressure is applied to the soil?

2400 n/m2

8

Gear A has 15 teeth, and Gear B has 10. 1f gear A makes 14 revolutions, how many will gear B make?

21

9

Two wheels are secured to a common axle. If the larger wheel has a radius of m and the smaller wheel has a diameter of m, what is the mechanical advantage of a force applied to the larger wheel?

10 to 1

10

A basic kitchen knife, like the one below, is based on which of the following simple machines?

wedge

11

How much force is needed to apply 50 ft-lb of torque to a bolt using a 2 ft-long wrench?

25 pounds

12

If a 10 N force applied to an object produces an acceleration of 10 m/s2, assuming friction is NOT negligible, what could the object's mass have been?

less than 1 kg

13

The force of friction between two surfaces moving past each other DOES NOT depend on

the speed at which the surfaces are moving past each other

14

The gravitational acceleration on Earth, g, is 9.8 m/s2. The gravitational acceleration on a neighboring planet, Xendor, is 3 times as much. What is the approximate weight of a 100 kg person on Xendor? (Hint: you can approximate the gravitational acceleration on Earth as 10 m/s2 to make calculations easier.)

3,000 N

15

Assuming no friction, if 80J of work was done to move an object 2 m, what was the net force that was applied?

40 N

16

A man pushes against an object at rest but fails to get it moving. Which of the following must be true about the th relationship between the applied force and the force of friction?

The applied force is equal to the force of static friction.

17

A ball with a mass of 10 kg starts rolling down a hill 20 m high. What is its approximate velocity when it hits the bottom, ignoring resistance?

20 m/s

18

A 500 g block made from a uniform material is suspended from the ceiling by two equal-length ropes equidistant from the center of the block, as depicted in the figure below. Which of the following best approximates the tension in rope 1 (T1)?

2.5 N

19

A hydraulic lift is set up as depicted below. Which of the following must be true

To do the same amount of work, Force 2 must be smaller than Force 1 but applied over a larger distance.

20

Two weights, one with a mass of 10 kg and another with a mass of 20 kg, are placed on opposite ends of a 9 m rod. To achieve rotational equilibrium, what distance must the fulcrum be placed from the 10 kg weight?

6.0 m

21

What is the kinetic energy of a 98 N object moving at 100 m/s?

50,000 J

22

A man pushes a 50 kg block at a distance of 10 meters in 20 seconds with a force of 100 N. How much power did he exert?

50 w

23

Based on the diagram below, approximately what minimum force must be applied to the rope to lift the object?

250 N

24

Snowshoes reduce the pressure exerted by the feet when walking on top of deep snow. A 150 lb woman puts on two rectangular snowshoes with dimensions 10 inches by 15 inches each. What pressure does the woman exert on the snow while both shoes equally bear her full weight?

0.5 psi

25

A 40 kg block is sitting on a table, and it is also pushed down by a 100 N force. What is the magnitude of the normal force provided by the table if the object remains at rest? (Use 10 m/s2 for gravity.)

500 N

26

A ball with a mass of 5 kg is thrown from a height of 10 meters at an angle of 30° above the horizontal with an initial velocity of 10 m/s. Consider any resistance to be negligible. What is the approximate total kinetic energy when the ball hits the ground?

750 J

27

Which of the answer choices best describes the topics that are included in the area of physics known as "mechanics?"

the laws of motion, energy, and forces

28

Once sufficient force is applied to a stationary object to overcome static friction, the object will accelerate if the same force is maintained. This is true because____.

the coefficient of static friction is greater than the coefficient of kinetic friction

29

Playground seesaws are constructed in the same way as first-class levers. A boy wants to play on the seesaw with his little brother. The big brother weighs 100 pounds; the little brother weighs 75 pounds and sits 8 feet from the seesaw's center. For the two brothers to be balanced, how far from the center of the seesaw should the big brother sit?

6.0 feet

30

A hydraulic lift has a 2 cm diameter piston that exerts a downward force of 20 N on the incompressible fluid in a closed system. If the piston that is at the other end has a diameter of 20 cm, how much upward force can it exert?

2,000 N