A120-v motor has mechanical power output of 2.10 hp. it is 80.0% efficient in convertingpower that it takes in by electrical transmission into mechanicalpower.
(a) find the current in the motor.
(b) find the energy delivered to the motor by electricaltransmission in 2.50 h of operation.
(c) if the electric company charges $0.160/kwh, what does it costto run the motor for 2.50 h?

a) 16.3 A

b) 17.6 MJ

c) $0.78

Explanation:

The mechanical power is watts is given by:

The mechanical power is 80% of the electrical power so:

The electrical power in the motor is given by:

so the current in the motor is:

Watt is equivalent to J/s, so the energy is given by:

The total cost is given by:

the independent variable, the one that is intentionally manipulated, is whether or not the car hits the barrier.

the dependent variable, the one that you measure the response in, is the distance that the washers travel.

answer;

d. are made mostly of liquid

explanation;

-the general   composition and structure planets includes; they have a thick gas and liquid layer covering a small,solid core. mostly the gases are hydrogen and helium atmosphere and layers of liquid hydrogen. for instance neptune and uranus are examples of the outer planets, they have a core covered by ice and ammonia.

-neptune's atmosphere is hydrogen and helium with a bit of methane so there is no oxygen to breath and the interior is made up of frozen water and ammonia with a rock and iron core. thus, there is no liquid water or solid surface to survive.