(5 bulbs)·(60 watts/bulb)·(20 minutes)·(1 joule per sec/watt)·(60 sec/minute)

= (5·60·20·1·60) (bulb·watt·minute·joule per sec·sec) / (bulb·watt·minute)

= 360,000 joules
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Another way:

Five 60-watt bulbs = 300 watts = 0.3 kilowatt

20 minutes = 1/3 hour

(0.3 kilowatt) · (1/3 hour) = 0.1 kilowatt-hour

8 0

3 years ago

If anyone could answer my question , please help -,- xD

Paraphin [41]

Kinematics is the study of motion, without any reference to the forces that cause the motion. It basically means studying how things are moving, not why they're moving. It includes concepts such as distance or displacement, speed or velocity, and acceleration, and it looks at how those values vary over time.

5 0

3 years ago

Read 2 more answers

3. If you were in a car collision, would you rather be hit by Vehicle 1 (2,027 kg) or Vehicle 2 (1,415 kg) from Activity 73? Exp

Inga [223]

Answer:

I say vehicle one, because both will apply the same amount of force but, because vehicle two has less mass, it will accelerate more rather than vehicle one which will accelerate less.

5 0

3 years ago

A body start from rest are moves with uniform acceleration of 60m/1/5^2.what distance does it cover in third second?

VladimirAG [237]

Answer:

Let's see what to do buddy...

Explanation:

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$a = \frac{60}{ ({ \frac{1}{5}) }^{2} } = \frac{60}{ \frac{1}{25} } = 60 \times 25 \\ \\ a = 15 \times 4 \times 25 = 15 \times 100 \\ a = 1500 \: \frac{m}{ {s}^{2} }$