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Lemur [1.5K]
2 years ago
6

A car moves with an average speed of 45 miles/hour. How long will it take the car to travel 90 miles?

Physics
1 answer:
balandron [24]2 years ago
3 0
It will take two hours for the car to travel 90 miles!!

45x2= 90
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While running, a person dissipates about 0.60 J of mechanical energy per step per kilogram of body mass. If a 61 kg person devel
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

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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=36.6Jthis 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

6 0
3 years ago
What is the experimental group(s)?
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5 0
3 years ago
IF a car trip 400 km in four hours what is the rate of speed that a car is traveling?
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krek1111 [17]

Answer:

<u>A</u>

Explanation:

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This means that it needs to act fast and efficiently.

Therefore, the connections among heart cells are characterized by :

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The correct option should be <u>A</u>

4 0
2 years ago
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