2 years ago

describe the forces acting on a car as it movies along a level highway in still air at a constant speed

Physics

1 answer:

Travka [436]2 years ago

3 0

Answers

The car's forward motion is opposed by the friction between the road and the tires and by the resistance of the air.

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How much time does it take 9,560 joules of work with 860 watts of power

tia_tia [17]

Explanation:

use equation power=watts/time

to find time rearrange to make time = power/wats

so you have your equation substitute the numbers

so 9560J/860W is 11 minutes

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3 years ago

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you are sitting on a beach and a wave strikes the shore every 10 seconds. a surfer tells you that these waves travel at a speed

aev [14]

Answer:

50 meters

Explanation:

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3 years ago

A cheetah runs 900 meters in 30 seconds. how fast is it going?

Serga [27]

900 meters/30 seconds= 30 meters/second

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3 years ago

The maximum stress in a section of a circular tube subject to a torque is τmax = 27 MPa . If the inner diameter is Di = 3.75 cm

DIA [1.3K]

Answer:

$T_{max} = 4.735\,kN\cdot m$

Explanation:

The shear stress due to torque can be calculed by using the following model:

$\tau_{max} = \frac{T_{max}\cdot r_{ext}}{J_{tube}}$

The maximum torque on the section is:

$T_{max} = \frac{\tau_{max}\cdot J_{tube}}{r_{ext}}$

The Torsion Constant for the circular tube is:

$J_{tube} = \frac{\pi}{32}\cdot (D_{ext}^{4}-D_{int}^{4})$

$J_{tube} = \frac{\pi}{4}\cdot [(0.053\,m)^{4}-(0.038\,m)^{4}]$

$J_{tube} = 4.560\times 10^{-6}\,m^{4}$

Now, the require output is computed:

$T_{max} = \frac{(27\times 10^{3}\,kPa)\cdot (4.560\times 10^{-6}\,m^{4})}{0.026\,m}$

$T_{max} = 4.735\,kN\cdot m$

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3 years ago

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A ball has a kinetic energy of 106 J. If the ball is moving at a velocity of 2.01 m/s, what is the mass of the ball, in kilogram

dem82 [27]

Answer:

Explanation:

KE= ½mv²

m = 2KE/v²

m = 2(106)/2.01²

m = 52.47394...

m = 52.5 kg

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2 years ago