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ki77a [65]
3 years ago
7

How does a trampoline work? Make sure to include which law explains this

Physics
1 answer:
Alekssandra [29.7K]3 years ago
8 0
Newton's first law: the law of inertia. An object at rest will stay at rest, or an object in motion will stay in motion, unless acted upon by an external force. This is why you don't get propelled upward if you simply stand on a trampoline—you have to move your legs (the external force)
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An athlete needs to lose weight and decides to do it by "pumping iron." (a) How many times must an 60.0 kg weight be lifted a di
Dennis_Churaev [7]

Answer:

a) 37171

b) 20650.5 sec

Explanation:

m = mass of the weight being lifted = 60.0 kg

d = distance by which the weight is lifted = 0.670 m

E = Energy available to burn = 1 lb = 3500 kcal = 3500 x 4184 J

g = acceleration due to gravity = 9.8 m/s²

n = number of times the weight is lifted

Energy available to burn is given as

E = n m g d

3500 x 4184 = n (60) (9.8) (0.670)

n = 37171

b)

T = time period for each lift up = 1.80 s

t = total time taken

Total time taken is given as

t = \frac{n}{T}

t = \frac{37171}{1.80}

t = 20650.5 sec

8 0
3 years ago
a circuit element having terminals a and b has vab = 10v and iba = 2a over a period of 20s, how much charge moves throught the e
PIT_PIT [208]

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3 years ago
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