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Andrei [34K]
3 years ago
12

a car accelerate at 9 m/s squared. Assuming the car starts from rest how far will it travel in 10 seconds

Physics
1 answer:
rusak2 [61]3 years ago
7 0

Answer:

450m

Explanation:

s = ut +  \frac{1}{2} a {t}^{2}  \\ s = 0 + t +  \frac{1}{2} a {t}^{2}  \\  \frac{1}{2 }  \times 9 \times  {10}^{2}  = 450m

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This number has 3 sig figs.
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A 5-kg concrete block is lowered with a downward acceleration of 2.8 m/s2 by means of a rope. The force of the block on the Eart
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3 years ago
A 10000 N net force is accelerating a car at a rate if 5.5 m/s^2. What is the cars’s mass?
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Studentka2010 [4]

Answer:

Part a)

F = 182.3 Lb

Part b)

P = 0.55 HP

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Diameter of the circle = 24 ft

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now the horse complete 144 trips in one hour

so time to complete one trip is given as

t = \frac{3600}{144} s

t = 25 s

now the speed of the horse is given as

v = \frac{2\pi r}{t}

v = \frac{\pi(7.3152)}{25}

v = 0.92 m/s

Part a)

Now we know that the power is defined as rate of work done

it is given as

P = F v

746 = F(0.92)

F = 810.9 N

F = 182.3 Lb

Part b)

Work done to climb up to 3 m height is given by

W = mgh

now we have

Power = \frac{Work}{time}

P = \frac{mgh}{t}

P = \frac{(70kg)(9.81)(3)}{5.0s}

P = 412.02 Watt

now we know that 1 HP = 746 Watt

so we have

P = \frac{412}{746} = 0.55 HP

8 0
3 years ago
Which is directly proportional to your weight on a planet's surface?
Oduvanchick [21]

D. Your mass and the mass of the planet

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4 years ago
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