Jordan wants to know the difference between using a 60-W and 100-W lightbulb in her lamp. She calculates the energy it would tak
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Answer:
a)
b)
Explanation:
Given:
- weight of the stone,
- initial velocity of vertical projection,
- air drag acting opposite to the motion of the stone,
The mass of the stone:
Now the acceleration of the stone opposite of the motion:
where:
d = deceleration
<u>In course of going up the net acceleration on the stone will be:</u>
a)
Now using the equation of motion:
where:
final velocity when the stone reaches at the top of the projectile = 0
h = height attained by the stone before starting to fall down
b)
during the course of descend from the top height of the projectile:
initial velocity,
The acceleration will be:
here the gravity still acts downwards but the drag acceleration acts in the direction opposite to the motion of the stone, now the stone is falling down hence the drag acts upwards.
Using equation of motion:
(+ve acceleration because it acts in the direction of motion)
Answer:
The force is
Explanation:
From the question we are told that
The mechanical advantage is
The load is
The height is
Generally mechanical advantage is mathematically represented as
Here E is the force that must be applied to move the piano
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