What is the mechanical advantage of a pulley?
2 answers:
Answer:
Mechanical advantage is the ratio of the load and effort.
Mechanical advantage of a pulley is 1.
Explanation:
A pulley system will help in reducing the effort when lifting a load. If more pulleys are used, less effort force is required, making the lifting easy.
When only one pulley is used to lift a load, the mechanical advantage is 1.
If the number of pulleys used are increased, less effort can be applied, as the mechanical advantage increases.
The mechanical advantage is equal to the number of ropes passing over the pulley or pulleys to which the load is attached.
The rope along which the effort is applied is not counted.
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Answer:
c)At a distance greater than r
Explanation:
For a satellite in orbit around the Earth, the gravitational force provides the centripetal force that keeps the satellite in motion:
where
G is the gravitational constant
M is the Earth's mass
m is the satellite's mass
r is the distance between the satellite and the Earth's centre
v is the speed of the satellite
Re-arranging the equation, we write
so we see from the equation that when the speed is higher, the distance from the Earth's centre is smaller, and when the speed is lower, the distance from the Earth's centre is larger.
Here, the second satellite orbit the Earth at a speed less than v: this means that its orbit will have a larger radius than the first satellite, so the correct answer is
c)At a distance greater than r