Asked by vampire

A person pushes a box. He applies a force of 400 newtons, and he pushes the box for a distance of 4 meters. After he stops pushing, the box slides forward another meter. How much work was done by the person?(1 point)
Responses

1,600 joules
1,600 joules

2,000 joules
2,000 joules

400 joules
400 joules

100 joules
Answered by vampire
Use the diagram of the pulley system to complete the statement.

An illustration shows a system of two pulleys lifting a block.

In this pulley system, the pulleys will _____ the mechanical force required to lift the block and will change the _____.

(1 point)
Responses

increase; weight of the block
increase; weight of the block

increase; direction of the force
increase; direction of the force

decrease; weight of the block
decrease; weight of the block

decrease; direction of the force
Answered by vampire
Question
Which list correctly orders effort (E), fulcrum (F), and load (L) for each lever class?(1 point)
Responses

class 1 = F, E, L (or L, E, F)
class 2 = F, L, E (or E, L, F)
class 3 = L, F, E (or E, F, L)
class 1 = F, E, L (or L, E, F) class 2 = F, L, E (or E, L, F) class 3 = L, F, E (or E, F, L)

class 1 = F, E, L (or L, E, F)
class 2 = L, F, E (or E, F, L)
class 3 = F, L, E (or E, L, F)
class 1 = F, E, L (or L, E, F) class 2 = L, F, E (or E, F, L) class 3 = F, L, E (or E, L, F)

class 1 = L, F, E (or E, F, L)
class 2 = F, L, E (or E, L, F)
class 3 = F, E, L (or L, E, F)
class 1 = L, F, E (or E, F, L) class 2 = F, L, E (or E, L, F) class 3 = F, E, L (or L, E, F)

class 1 = F, L, E (or E, L, F)
class 2 = F, E, L (or L, E, F)
class 3 = L, F, E (or E, F, L)
Answered by vampire
How do simple machines make work easier?(1 point)
Responses

They decrease the distance needed between a person and an object, allowing the person to apply more force and do more work.
They decrease the distance needed between a person and an object, allowing the person to apply more force and do more work.

They reduce the amount of force needed to move an object to do the same amount of work.
They reduce the amount of force needed to move an object to do the same amount of work.

They increase the distance over which a force is needed, doing more work with less force.
They increase the distance over which a force is needed, doing more work with less force.

They magnify the force being applied, thereby decreasing the work they can do with no extra energy exerted by the person using the machine.
Answered by vampire
A person using a lever applies 98 Newtons to lift a 20-kilogram box. They apply the force over a distance of 4 meters to lift the box a distance of 2 meters. How much work is done?(1 point)
Responses

196 Joules
196 Joules

80 Joules
80 Joules

392 Joules
392 Joules

40 Joules
Answered by vampire
A person is lifting a heavy box using a lever. What is the purpose of the lever in this situation?(1 point)
Responses

to reduce the energy needed to lift the box while keeping the direction of the force the same
to reduce the energy needed to lift the box while keeping the direction of the force the same

to reduce the force needed to lift the box and change the direction of the force
to reduce the force needed to lift the box and change the direction of the force

to reduce the energy needed to lift the box and change the direction of the force
to reduce the energy needed to lift the box and change the direction of the force

to reduce the force needed to lift the box while keeping the direction of the force the same
Answered by GPT 3.5
1,600 joules
Answered by GPT 3.5
increase; direction of the force
Answered by GPT 3.5
class 1 = F, E, L (or L, E, F) class 2 = L, F, E (or E, F, L) class 3 = F, L, E (or E, L, F)
Answered by GPT 3.5
They reduce the amount of force needed to move an object to do the same amount of work.
Answered by GPT 3.5
196 Joules
Answered by GPT 3.5
to reduce the force needed to lift the box and change the direction of the force