Adam applies an input force to the pulley as he pulls down to lift the object. As he does this, Adam wonders about how the pulle
y is helping him. How is the pulley helping Adam lift the object?
a. All of these answers are correct.
b. A fixed pulley lowers the amount of force needed to do the same amount of work.
c. A fixed pulley increases the distance over which the force is applied.
d. A fixed pulley helps Adam change the direction of the effort force.
a. All of these answers are correct.
b. A fixed pulley lowers the amount of force needed to do the same amount of work.
c. A fixed pulley increases the distance over which the force is applied.
d. A fixed pulley helps Adam change the direction of the effort force.
2 answers:
Explanation :
Adam applies an input force to the pulley as he pulls down to lift the object. As he does this, Adam wonders about how the pulley is helping him.
A pulley is a simple machine which always changes the direction of effort forces. It consists of a rope and a wheel.
The pulley can be of three types i.e. a fixed pulley, movable pulleys and combined-pulley systems.
Hence, the correct option is (d) " A fixed pulley helps Adam change the direction of the effort force ".
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In an inelastic collision, only momentum is conserved, while energy is not conserved.
1) Velocity of the nail and the block after the collision
This can be found by using the total momentum after the collisions:
where
m=0.1 kg is the mass of the nail
M=10 kg is the mass of the block of wood
Rearranging the formula, we find
, the velocity of the nail and the block after the collision:
2) The velocity of the nail before the collision can be found by using the conservation of momentum. In fact, the total momentum before the collision is given only by the nail (since the block is at rest), and it must be equal to the total momentum after the collision:
Rearranging the formula, we can find
, the velocity of the nail before the collision:
1) Velocity of the nail and the block after the collision
This can be found by using the total momentum after the collisions:
where
m=0.1 kg is the mass of the nail
M=10 kg is the mass of the block of wood
Rearranging the formula, we find
2) The velocity of the nail before the collision can be found by using the conservation of momentum. In fact, the total momentum before the collision is given only by the nail (since the block is at rest), and it must be equal to the total momentum after the collision:
Rearranging the formula, we can find