Week 7: Work and Energy Capabilities

Questão 1 de 10

1

Work is the product of:

Selecione uma das seguintes:

Force x Time
Force x Distance
Energy x Distance
Energy x Time

Explicação

Questão 2 de 10

1

Preencha os espaços em branco para completar o texto.

A woman carries a 5 kg box of clothes to donate into the shop. If she walks a horizontal distance of 10 meters from her car to the shop door, how much work has gravity done on the box?

First blank is the numerical value. The second blank is for the units.

W =

Explicação

Questão 3 de 10

1

Preencha o espaço em branco para completar o texto.

How much potential energy does a 1 kg textbook have if it is thrown to a height of 5 meters? (Use a value of 10 for the acceleration due to gravity)

U = J

Explicação

Questão 4 de 10

1

A book is dropped and slams loudly onto a desktop. Compare the kinetic energy at the bottom to the potential at the top of its motion.

Selecione uma das seguintes:

KE > U
U > KE
KE = U
Need more values

Explicação

Questão 5 de 10

1

Preencha o espaço em branco para completar o texto.

What is the kinetic energy of a 1000 kg car moving at 10 m/s?

KE = J

Explicação

Questão 6 de 10

1

In order to life a 1 kg book to a height of 2 m, how much work must be done? Use a value of 10 for the acceleration due to gravity.

Selecione uma das seguintes:

2 J
0.2 J
200 J
20 J

Explicação

Questão 7 de 10

1

Preencha o espaço em branco para completar o texto.

How fast is a 5 kg ball moving the instant before striking the ground after it is dropped from a height of 4 meters?

v = m/s

Explicação

Questão 8 de 10

1

A boy pushes a chair with a force of 25 N. If he exerts the force for 2 meters, how much work has he done on the chair?

Selecione uma das seguintes:

25 J
50 J
50 N
12.5 J

Explicação

Questão 9 de 10

1

A truck driver is trying to push a 1500 kg loaded truck with an applied force of 5000 N. Unfortunately, his attempt was unsuccessful the truck stays stationary no matter how hard the driver pushes. How much work is done by the driver?

Selecione uma das seguintes:

Zero
F * x
F * t
- F * x

Explicação

Questão 10 de 10

1

Two heavy objects collide. Which of the following could be where their initial kinetic energies could be transferred?

Selecione uma ou mais das seguintes:

Sound
Heat
Friction
Surface Deformation
They exactly cancel each other out
The energies pass through the other car

	Criado por Ryan Elwell quase 5 anos atrás

Work, Energy and the link between the two.

Week 7: Work and Energy Capabilities

Questão 1 de 10

Work is the product of:

Selecione uma das seguintes:

Explicação

Questão 2 de 10

Preencha os espaços em branco para completar o texto.

A woman carries a 5 kg box of clothes to donate into the shop. If she walks a horizontal distance of 10 meters from her car to the shop door, how much work has gravity done on the box? First blank is the numerical value. The second blank is for the units. W =

Explicação

Questão 3 de 10

Preencha o espaço em branco para completar o texto.

How much potential energy does a 1 kg textbook have if it is thrown to a height of 5 meters? (Use a value of 10 for the acceleration due to gravity) U = J

Explicação

Questão 4 de 10

A book is dropped and slams loudly onto a desktop. Compare the kinetic energy at the bottom to the potential at the top of its motion.

Selecione uma das seguintes:

Explicação

Questão 5 de 10

Preencha o espaço em branco para completar o texto.

What is the kinetic energy of a 1000 kg car moving at 10 m/s? KE = J

Explicação

Questão 6 de 10

In order to life a 1 kg book to a height of 2 m, how much work must be done? Use a value of 10 for the acceleration due to gravity.

Selecione uma das seguintes:

Explicação

Questão 7 de 10

Preencha o espaço em branco para completar o texto.

How fast is a 5 kg ball moving the instant before striking the ground after it is dropped from a height of 4 meters? v = m/s

Explicação

Questão 8 de 10

A boy pushes a chair with a force of 25 N. If he exerts the force for 2 meters, how much work has he done on the chair?

Selecione uma das seguintes:

Explicação

Questão 9 de 10

A truck driver is trying to push a 1500 kg loaded truck with an applied force of 5000 N. Unfortunately, his attempt was unsuccessful the truck stays stationary no matter how hard the driver pushes. How much work is done by the driver?

Selecione uma das seguintes:

Explicação

Questão 10 de 10

Two heavy objects collide. Which of the following could be where their initial kinetic energies could be transferred?

Selecione uma ou mais das seguintes:

Explicação

A woman carries a 5 kg box of clothes to donate into the shop. If she walks a horizontal distance of 10 meters from her car to the shop door, how much work has gravity done on the box?

First blank is the numerical value. The second blank is for the units.

W =

How much potential energy does a 1 kg textbook have if it is thrown to a height of 5 meters? (Use a value of 10 for the acceleration due to gravity)

U = J

What is the kinetic energy of a 1000 kg car moving at 10 m/s?

KE = J

How fast is a 5 kg ball moving the instant before striking the ground after it is dropped from a height of 4 meters?

v = m/s