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podryga [215]
3 years ago
10

An elevator motor in a high-rise building can do 3500 kJ of work in 5 min. Find the power developed by the motor. Explain if you

can plz
Physics
1 answer:
Ilya [14]3 years ago
4 0

Answer:

P = 11666.6 W

Explanation:

Given that,

Work done by the motor, W = 3500 kJ

Time, t = 5 min = 300 s

We need to find the power developed by the motor. Power developed is given by :

P=\dfrac{E}{t}\\\\P=\dfrac{3500\times 10^3}{300}\\\\P=11666.7\ W

So, the required power is 11666.6 W.

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Pls help me with this problem!!
Olenka [21]

Answer:

v = 19.6 m/s.

Explanation:

Given that,

The radius of the circle, r = 5 m

The time period of the ball, T = 1.6s

We need to find the ball's tangential velocity.

The formula for the tangential velocity is given by :

v=\dfrac{2\pi r}{T}

Putting all the values in the above formula

v=\dfrac{2\pi \times 5}{1.6}\\\\v=19.6\ m/s

So, the tangential velocity of the ball is 19.6 m/s. Hence, the correct option is (c).

7 0
3 years ago
will the value of g be affected by the radius of the earth? consider the real shape of the earth. compare the acceleration due t
sp2606 [1]

Answer:

Yes, the value of g affected by the radius.

Explanation:

The formula for the force of gravity of 2 objects is

F_{gravity} = G\frac{m_{1}m_{2}}{r^2}, where m1 and m2 are the masses of the 2 objects, r is the radius, and G is the gravitational constant, which is approximately 6.67 \cdot 10^{-11}.

Therefore, as the radius if bigger, the force of gravity is going to be smaller exponentially.  

5 0
4 years ago
The term used to describe the quantity of matter that a body possesses is:
barxatty [35]
The term used to describe the quantity of matter that a body possesses is mass.
7 0
3 years ago
A stone on ground is zero energy​
NNADVOKAT [17]

Answer:

A stone on the ground does not have zero energy…there is an internal potential in every object. Aldo is not in action or in any mechanical motion it is being acted upon by gravity and also molecular forces and energy.

<em>Hope</em><em> </em><em>this</em><em> helps</em><em> </em><em>!</em>

7 0
3 years ago
A 4watt night light is left on for 8 hours each night. how much work does it do per night
nlexa [21]

Power = (work) / (time)

Work = (power) x (time)

          = (4 watts) x (8 hours)

1 "watt" = 1 joule/sec .

Work = (4 joule/sec) x (8 hours) x (3,600 sec/hr)

         = (4 x 8 x 3,600) joules  =  1,024 joules .

==================================

Another way:

4 watts = 0.004 kilowatt

Work = energy = (power) x (time)

                        = (0.004 kw) x (8 hrs)  =  0.032 kilowatt-hour .

7 0
3 years ago
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