2 years ago

A kid applies a force of 70 N to a ball over 1.1 meters. How much work did he do on the ball?

Physics

1 answer:

LekaFEV [45]2 years ago

8 0

Answer:

77J

Explanation:

Not really an explanation to this, I just had this lesson last year and remembered it.

Hope I helped! ☺

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A car drives to the east in a time of 4 hours. Then, immediately (not realistic, but just assume this is the case for this probl

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Answer:

Average speed in east direction $speed=\frac{distance}{time}=\frac{28}{4}=7km/hr$

Explanation:

We have given average speed of the entire trip = 5 km/hr

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So total time of the trip = 4+4 = 8 hours

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As the car travel 12 km in 4 hours to the west

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2 years ago

A block of mass m=1kg sliding along a rough horizontal surface is traveling at a speed v0=2m/s when it strikes a massless spring

topjm [15]

Here we can use the work energy theorem

$W_f + W_s = K_f - K_i$

here we know that

$K_f = 0$

as it come to rest finally

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$K_i = \frac{1}{2}\times 1\times 2^2$

$K_i = 2 J$

now work done by friction force will be given as

$W_f = - F_f \times d = -\mu mg d$

$W_f = - \mu(1)(9.8)(0.10) = - 0.98\mu$

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$W_s = \frac{1}{2}k(x_i^2 - x_f^2)$

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3 years ago

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A) Electromagnet

B) Generator

<u>C) Motor </u>

D) Transformer

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