Advertisements
Advertisements
Question
If the power of a motor is 100 kW, at what speed can it raise a load of 50,000 N?
Advertisements
Solution
Power is the product of force and velocity.
P = Fv
`:. v = P/F = (100 xx 10^3)/50000 = 2 ms^(-1)`
APPEARS IN
RELATED QUESTIONS
When a body is placed on a table top, it exerts a force equal to its weight downwards on the table top but does not move or fall

1) Name the force exerted by the table top
2) What is the direction of the force?
Draw a simplified diagram of a lemon crusher, indicting of load and effort
An ox can apply a maximum force of 1000 N. It is taking part in a cart race and is able to pull the cart at a constant speed of 30 ms-1 while making its best effort. Calculate the power developed by the ox.
Is it possible that no transfer of energy may take place even when a force is applied to a body?
What do you mean by uniform circular motion?
A boy takes 3 minutes to lift a 20 litre water bucket from a 20 m deep well, while his father does it in 2 minutes.
How much work each does? Take density of water = 103 kg m-3 and g = 9.8 N kg-1.
Justify the statement. “Power can be expressed as the product of force and velocity.”
What happens to the power if the time for doing work is reduced from t second to t/10 second?
For the following scenario, state whether the work done by gravity is positive, negative, or zero.
A car in neutral gear is coming down the slope.
