# physical science

posted by .

How long would it take a 20.0 hp motor to lift a 1,000.0 kg crate from the bottom of a freighter's hold to the deck (40.0 m)?

• physical science -

The work required is
M*g*H = 1000*9.81*40 = 3.92*10^5 Joules

A 20 HP motor can provide 20*746 = 14,920 watts (J/sec) of power.

Time= Work/Power

I get 26.3 seconds

## Similar Questions

1. ### science

How long would it take a 20.0 hp motor to lift a 1,000.0 kg crate from the bottom of a freight's hole deck(40.0m)?
2. ### physics

A crate of mass m (=40 kg) is placed at rest on a (frictionless) inclined plane, which has an angle (= 30o) above horizontal. a.) The force of gravity on the crate is: b.) The normal force on the crate is: size: N c.) The net force …
3. ### physical science

how much power is required to lift the crate
4. ### Physical Science

an initially stationary 15.0 kg crate of cheese wheels is pulled via a cable a distance d = 5.70 m up a frictionless ramp to a height of h = 2.5 m, where it stops. What is its potential energy of the crate after it is lifted?
5. ### physics

How long will it take a 1030 W motor to lift a 330 kg piano to a sixth-story window 13.0 m above?
6. ### physics

How long will it take a motor 1500 watt motor to lift a 500kg elevator 30 meters?
7. ### physics

How long will it take a 1630 W motor to lift a 285 kg piano to a sixth-story window 16.0 m above?
8. ### Physics

An electric motor is rated to have a maximum power output of 0.72 hp. If this motor is being used to lift a crate of mass 188 kg, how fast (i.e., at what speed) can it lift the crate?
9. ### physics

A worker in a warehouse uses a rope passing through some pulleys to lift a heavy crate. The worker exerts a force five times less than the weight of the crate but has to move the rope four times as far as the crate moves. This situation... …
10. ### Physics

How long will it take a motor with an output power of 4000 W to lift a 250 kg container vertically upwards 25 m?

More Similar Questions