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3 years ago

A motor exerts a force of 12,00N to lift an elevator 8.0m in 7.0secs what is the power produced by the motor?

Physics

1 answer:

SashulF [63]3 years ago

6 0

Answer:

1371.4watt

Explanation:

from power=energy/time

BUT energy=force times distance

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Explain the difference between speed and velocity and indicate if these are scalar or vector quantities

Natali5045456 [20]

Speed can never be negative because it does not depend in which direction the car moves whereas, velocity will change if a car turns from due North to East.
Quantities which can be described only by their magnitudes are called scalars and those which are described by both, magnitude and direction are vectors

3 0

3 years ago

a skier starts from rest and skis down a 82 meter tall hill labeled h1, into a valley and staught back up another 35 meter hill(

horrorfan [7]

Answer:

She is going at 30.4 m/s at the top of the 35-meter hill.

Explanation:

We can find the velocity of the skier by energy conservation:

$E_{1} = E_{2}$

On the top of the hill 1 (h₁), she has only potential energy since she starts from rest. Now, on the top of the hill 2 (h₂), she has potential energy and kinetic energy.

$mgh_{1} = mgh_{2} + \frac{1}{2}mv_{2}^{2}$ (1)

Where:

m: is the mass of the skier

h₁: is the height 1 = 82 m

h₂: is the height 2 = 35 m

g: is the acceleration due to gravity = 9.81 m/s²

v₂: is the speed of the skier at the top of h₂ =?

Now, by solving equation (1) for v₂ we have:

$v_{2}^{2} = \frac{2mg(h_{1} - h_{2})}{m}$

$v_{2} = \sqrt{2g(h_{1} - h_{2})} = \sqrt{2*9.81 m/s^{2}*(82 m - 35 m)} = 30.4 m/s$

Therefore, she is going at 30.4 m/s at the top of the 35-meter hill.

I hope it helps you!

6 0

2 years ago

When a 1.50V battery is shorted by a copper wire whose resistance can be ignored, the current through the copper wire is 2.75 A.

viva [34]

Answer:

Internal resistance = 0.545 ohm

Explanation:

As per ohm's law we know that

$V = iR$

here we know that

i = electric current = 2.75 A

V = potential difference = 1.50 Volts

now from above equation we have

$1.50 = 2.75 ( R)$

now we have

$R = \frac{1.50}{2.75}$

$R = 0.545 ohm$

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3 years ago

Which sample of water has the most thermal energy?

Ivanshal [37]

Answer:

THE ANSWER IS #A

Explanation:

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3 years ago

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