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3 years ago

A car is traveling at a constant velocity of 20 m/s for 45 seconds. How far does the car go?

Physics

2 answers:

Arisa [49]3 years ago

4 0

Answer:

Explanation:

D=s*t

D=(20)(45)

D=900m.

hope it helps

n200080 [17]3 years ago

3 0

Answer: My bad bro. Just tryna get me some points g

Explanation: tuff

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An elevator whose mass is m = 400 kilograms is supported by a cable. A frictional force of f = 80 newtons is applied to the elev

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Answer:

3924 N

5124 N

4004 N

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Explanation:

m = Mass of elevator = 400 kg

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When the elevator is stationary only the acceleration due to gravity will be acting on it

Tension

$T=mg\\\Rightarrow T=400\times 9.81\\\Rightarrow T=3924\ N$

The tension is 3924 N

The balanced force equation would be

$T-mg-f=ma\\\Rightarrow T=ma+mg+f\\\Rightarrow T=400\times 2.8+400\times 9.81+80\\\Rightarrow T=5124\ N$

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When velocity is constant acceleration is zero

$T-mg-f=0\\\Rightarrow T=mg+f\\\Rightarrow T=400\times 9.81+80\\\Rightarrow T=4004\ N$

The tension is 4004 N

$T-mg-f=-ma\\\Rightarrow T=-ma+mg+f\\\Rightarrow T=-400\times 2.8+400\times 9.81+80\\\Rightarrow T=2884\ N$

The tension would be 2884 N

When velocity is constant acceleration is zero

$T-mg-f=0\\\Rightarrow T=mg+f\\\Rightarrow T=400\times 9.81+80\\\Rightarrow T=4004\ N$

The tension is 4004 N

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