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3 years ago

Consider two less-than-desirable options.

Physics

1 answer:

Gemiola [76]3 years ago

7 0

Answer:

The force would be the same in both cases - option C.

Explanation:

The change in momentum is known as an impulse. In the two cases under consideration, the change in momentum is the same, thus impulse for both cases is the same.

Impulse is the average force multiplied by time interval.

I = F(average)*ΔT. Where F(average) is the average force and ΔT is the time interval.

The average force in both cases is the same since the collision time is the same.

Thus option C is the correct answer.

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liraira [26]

Answer:

2.66m/s

Explanation:

information we have

power: 65W

work per step per kilogram: 0.60J

mass: 61kg

length of a running step: 1.5m

---------------

the formula for power is:

$P=\frac{W}{t}$

where W is the work and t is time.

time is also defined as: $t=\frac{distance}{velocity}=\frac{d}{v}$

so substituting this into the formula for power we get:

$P=\frac{W*v}{d}$

where v is the velocity we are looking for, d is the distance per step: $d=1.5m$ , W is the work per step and P is power $P=65W$ .

we know that the work per step per kilogram is:

0.60J

so to find the work per step of his whole body we need to multiply the 0.60J by the 61 kilograms of his mas:

$W=0.60J*61kg\\W=36.6J$ this is the work per step of the person.

So now we can calculate the velocity using the formula for power

$P=\frac{W*v}{d}$

clearing for v:

$v=\frac{P*d}{W}\\$

and substituting known values:

$v=\frac{(65W)(1.5m)}{36.6J}= 2.66m/s$

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