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Airida [17]
3 years ago
7

Please help........​

Physics
1 answer:
Alona [7]3 years ago
8 0

Answer:

It's A

Explanation:

I'm in 7th grade

Good luck!

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To move a 51kg cabinet across a floor requires a force of 200N to start it moving, but then only 100N to keep it moving a steady
Assoli18 [71]

Answer:

a) \mu_s =0.40

b) \mu_k =0.20

Explanation:

Given:

Mass of the cabinet, m = 51 kg

a) Applied force = 200 N

Now the force required to move the from the state of rest (F) = coefficient of static friction (\mu_s)× Normal reaction(N)

N = mg

where, g = acceleration due to gravity

⇒N = 51 kg × 9.8 m/s²

⇒N = 499.8 N

thus, 200N  = \mu_s × 499.8 N

⇒\mu_s = \frac{200}{499.8}=0.40

b) Applied force = 100 N

since the cabinet is moving, thus the coefficient of kinetic(\mu_k) friction will come into action

Now the force required to move the from the state of rest (F) = coefficient of kinetic friction (\mu_k)× Normal reaction(N)

N = mg

where, g = acceleration due to gravity

⇒N = 51 kg × 9.8 m/s²

⇒N = 499.8 N

thus, 100N  = \mu_k × 499.8 N

⇒\mu_k = \frac{100}{499.8}=0.20

6 0
3 years ago
A softball is fouled off with a vertical velocity of 20 m/s and a horizontal velocity of 15 m/s. what is the resultant velocity
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25 m/s is the answer
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3 years ago
How do I find time?
kari74 [83]

<u>Answer:</u>   3

H = 45 m ,

time required for the stone

  S = u.t+(1/2) g.t²

45  = (1/2) 9.81. t²      since u( initial velocity) = 0 ; S =H.

 t²  = 9.17 s

<em>  t = 3.02 s  </em>

therefore answer is 3 m/s

<em>  if you satisfy with explanation, please give brainiest ; </em>



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I think the answer is A.
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