Question

please help me please​

Answer 1

HERE IS A DETAILED EXPLANATION MY GUY

It will take the motor 39.2 seconds to lift the piano to the sixth-story window.

Given the following data;

Power = 1500 Watts

Mass = 300 kg

Height = 20 meters

We know that acceleration due to gravity is equal to 9.8 m/s².

To find how long it will take to lift the piano to the sixth-story window;

First of all, we would have to determine the gravitational potential energy required to lift the piano up.

Mathematically, gravitational potential energy is given by the formula;

where:

G.P.E is the  gravitational potential energy of an object.

m is the mass of the object.

g is the acceleration due to gravity.

h is the height of the object.

Substituting into the formula, we have;

G.P.E = 58,800 Joules

Next, we would determine the time using the following formula;

Substituting the values into the formula, we have;

Time = 39.2 seconds.

Therefore, it will take the motor 39.2 seconds to lift the piano to the sixth-story window.