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:
Speed of the boat, v = 4.31 m/s
Explanation:
Given that,
Height of the bridge, h = 32 m
The model boat is 11 m from the point of impact when the key was released, d = 11 m
Firstly, we will find the time needed for the boat to get in this position using second equation of motion as :
Here, u = 0 and a = g
t = 2.55 seconds
Let v is the speed of the boat. It can be calculated as :
v = 4.31 m/s
So, the speed of the boat is 4.31 m/s. Hence, this is the required solution.
Answer:
240 ohms
Explanation:
From Ohms law we deduce that V=IR and making R the subject of the formula then R=V/I where R is resistance, I is current and V is coltage across. Substituting 120 V for V and 0.5 A for A then
R=120/0.5=240 Ohms
Alternatively, resistance is equal to voltage squared divided by watts hence