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3 years ago

In which parking situations should you use your parking brake?

Physics

2 answers:

vredina [299]3 years ago

6 0

Answer:

Always!!

Explanation:

I hope it help! :D

VMariaS [17]3 years ago

5 0

Answer:
-You should use your parking brake when on a hill/mountain with a huge drop because your car can’t slide off the edge.
-When there is a flood where your car is sitting because the water can’t carry your car

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Electricity costs 10p per unit. How much will it cost Sam to use a 85W laptop and a 60W lamp for an hour?

Goryan [66]

The standard unit is KW/hr, = 1,000W/hr.
(85 + 60) = 145W.
You need to find its fraction of 1,000W., so (145/1000) = 0.145 KWH.
(0.145 x 10p) = 1.45p. per hr.

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3 years ago

A boy rides a sled down a steep, snow.covered hill. Which of

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Answer:

a. Potential energy decreases and Kinetic energy increases

Explanation:

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3 years ago

A pulley lifts a 72-N load with a force of 24-N. The input distance is 2m and the output distance is 0.5m. What is the efficienc

Debora [2.8K]

Answer:

Explanation:

Work done on the lever ( input energy ) = force applied x input distance

= 24 N x 2m = 48 J

Work done by the lever ( output energy ) = load x output distance

= 72 N x 0.5m = 36 J

efficiency = output energy / input energy

= 36 J / 48 J

= 3 / 4 = .75

In percentage terms efficiency = 75 % .

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3 years ago