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Pani-rosa [81]
3 years ago
15

A car initially at rest can accelerate at 7 m/s2. How long will it take the car to reach 60 m/s?

Physics
2 answers:
LUCKY_DIMON [66]3 years ago
7 0

Answer:8.57sec.

Explanation: First you take the Acceleration Formula which is a=(vf-vi)/t and plug everything in to where you get 7m/s^2= (60-0)/t. now you take that and rearrange it to t=60/7 which finally comes to your answer of 8.57sec.

strojnjashka [21]3 years ago
5 0

Answer:

The answer to your question is      t = 8.6 s

Explanation:

Data

Initial velocity = vo = 0 m/s

acceleration = a = 7 m/s²

time = t = ?

final velocity = vf = 60 m/s

Formula

             vf = vo + at

-Solve for t

             at = vf - vo

               t = (vf - vo) / a

-Substitution

               t = (60 - 0) / 7

-Simplification

               t = 60 / 7

-Result

                t = 8.6 s

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A hot-air balloon has a volume of 440 × 10^3 ^3. Calculate the buoyant force that the surrounding cold air exerts on the balloon
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Answer:

Explanation:

Given that,

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V = 440 × 10³ m³

Buoyant force F?

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ρ = 2.58 kg/m³

The buoyant force is the weight of water displaced and it is calculated using

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A weightlifter lifts a 1,250 N barbell 2 m in 3 s. How much power was used to lift the barbell?
OverLord2011 [107]
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3 years ago
A block of mass m = 2.0 kg slides head on into a spring of spring constant k = 260 N/m. When the block stops, it has compressed
nasty-shy [4]

Answer:

a) Ws = 2.548 J

b) Wf = 1.153 J

c) v = 1.923 m / s

Explanation:

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Ws =  ½ * k * x²

Ws =  ½ * 260 N/m *0.14² m  

Ws =  2.548J

b) The increase in thermal energy can by find using  

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