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gogolik [260]
3 years ago
8

A certain car can accelerate from rest to 70km/h in 7 seconds.Find the cars average acceleration

Physics
2 answers:
Vaselesa [24]3 years ago
7 0
First: we have to express the units of velocity in m/s
70 km/h=70 km/h(1000 m/km)(1h/3600 s)=19.4444....m/s=19.44 m/s

average acceleration= (final velocity -initial velocity)/ time
average acceleration=(19.44 m/s - 0 m/s)/7 s≈2.78 m/s²

Answer: the cars average acceleration would be: 2.78 m/s²
Setler [38]3 years ago
4 0
A= (70-0)/7
a=10 km/hr/sec

10 km/hr = 10 km*100 m/km/(1 hr*3=600 sec/hr)=25/9 m/sec
---------------------------------------------------------------------------------
a= 25/9 m/sec/sec

Hope this help, plz make brainly-est
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One horsepower (hp) is the amount of power required to lift a 75-kg mass a vertical distance of 1 m in 1 s. What is 2 hp equival
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Answer:

1470 W

Explanation:

Power: This can be defined as the rate at which work is done or energy is used up. The S.I unit of power is Watt (W).

The expression for power is given as,

P = Energy/time

P = mgh/t ...................... Equation 1

Where P = power, m = mass, h = height, t = time, g = acceleration due to gravity.

Given: m = 75 kg, g =9.8 m/s², h = 1 m, t = 1 s.

Substitute into equation 1

P = (75×1×9.8)/1

P = 735 W.

From the above,

1 hp = 735 W

2 hp = (2×735) W

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3 years ago
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The speed of light inside a medium is (2.0 x 10^8m/s) What is the index of refraction (n) of the medium?
kondor19780726 [428]

Answer:

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2 years ago
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3 years ago
A tire 0.500 m in radius rotates at a constant rate of 200 rev/min. Find the speed and acceleration of a small stone lodged in t
arsen [322]

Answer:

v = 10.47 m/s

a = 219.32 m/s²

Explanation:

The velocity of the stone can be given by the following formula:

v = r ω

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Therefore,

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<u>v = 10.47 m/s</u>

<u></u>

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<u>a = 219.32 m/s²</u>

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3 years ago
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