3 years ago

A night lamp uses a 30 W bulb. If it is left on continuously for 8 hours, how much energy will it use?

Physics

2 answers:

den301095 [7]3 years ago

6 0

Answer:

Explanation:

$30W * 8 h = 240 Wh = 0.240 kWh$

bezimeni [28]3 years ago

4 0

Answer:

0.24 kWh

Explanation:

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dedylja [7]

Answer:

F = 768 N

Explanation:

It is given that,

Speed of the elevator, v = 3.2 m/s

Grain drops into the car at the rate of 240 kg/min, $\dfrac{dm}{dt}=240\ kg/min = 4\ kg/s$

We need to find the magnitude of force needed to keep the car moving constant speed. The relation between the momentum and the force is given by :

$F=\dfrac{dp}{dt}$

$F=m\dfrac{dv}{dt}+v\dfrac{dm}{dt}$

Since, the speed is constant,

$F=m\dfrac{dv}{dt}$

$F=v\dfrac{dm}{dt}$

$F=3.2\times 240$

F = 768 N

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