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3 years ago

What is constant velocity in comparison to instantaneous velocity?

Physics

1 answer:

sergij07 [2.7K]3 years ago

8 0

Answer:

Please find the answer in the explanation

Explanation:

Constant velocity is the uniform velocity. That is, the velocity is steady and it does not change. You will have a constant velocity when you maintain a certain velocity for a long time without changing it.

At constant velocity, acceleration is equal to zero.

Instantaneous velocity is the change in distance in a specific direction per specific time. It is a velocity at a certain time. It is not uniform.

Change in instantaneous velocity is equal to acceleration.

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Answer:

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Explanation:

We are given that

Mass,m=60 kg

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Speed,v=5 m/s

Area, $A=0.344 m^2$

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Coefficient of rolling resistance, $\mu_r=0.007$

Friction force, $f=\mu_rmg=0.007\times 60\times 9.8=4.1 N$

Where $g=9.8 m/s^2$

Let speed of cyclist=v'

Drag force, $F_d=\frac{1}{2}\rho_{air}AC_dv^2$

Density of air, $\rho_{air}=1.225 kg/m^3$

$F_d=\frac{1}{2}\times 1.225\times 0.344\times 0.88(5)^2=4.635N$

Power,P= $(F_d+f)\times v'$

$340=(4.1+4.635) v'=8.735v'$

$v'=\frac{340}{8.735}=38.9m/s$

$v'=87.1 mph$

1 m=0.00062137 miles

1 hour=3600 s

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