The cost of gas is $1.27 per liter. How much does a gallon of gas costs?

A skier is pulled by a towrope up a frictionless ski slope that makes an angle of 12 degrees with the horizontal. The rope moves

MArishka [77]

Answer:

Explanation:

Given,

Work done by the rope 900 m/s.
Angle of inclination of the slope = $\theta\ =\ 12^o$
Initial speed of the skier = v = 1.0 m/s
Length of the inclined surface = d = 8.0 m

part (a)

The rope is doing the work against the gravity on the skier to uplift up to the inclined surface. Therefore the work done by the rope is equal to the work done on the skier due to the gravity

$\therefore W_r\ =\ W_g\ =\ 900\ J$

In both cases the height attained by the skier is equal. and the work done by gravity does not depend upon the speed of the skier.

part (b)

Initial speed of the skier = v = 1.0 m/s.

Rate of the work done by the rope is power of the rope.

$Power\ =\ \dfrac{\Delta W}{\Delta t}\\\Rightarrow P\ =\ \dfrac{\Delta W}{\dfrac{d}{v}}\\\Rightarrow P\ =\ \dfrac{\Delta W\times v}{d}\\\Rightarrow P\ =\ \dfrac{900\times 1.0}{8.0}\\\Rightarrow P\ =\ 112.5\ Watt$

Part (c)

Initial speed of the skier = v = 2.0 m/s.

Rate of the work done by the rope is power of the rope.

$Power\ =\ \dfrac{\Delta W}{\Delta t}\\\Rightarrow P\ =\ \dfrac{\Delta W}{\dfrac{d}{v}}\\\Rightarrow P\ =\ \dfrac{\Delta W\times v}{d}\\\Rightarrow P\ =\ \dfrac{900\times 2.0}{8.0}\\\Rightarrow P\ =\ 225\ Watt$

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How long does it take an airplane to fly 1500 miles of it maintains a speed of 600 miles per hour?

prisoha [69]

2.5 hours. divide 15000 by 600

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Earth's gravitational force just got three times stronger! What happens to your weight?

kicyunya [14]

Your "weight" is the name you give to that gravitational force.
So your question actually says:

"Your weight just got three times stronger !
What happens to your weight ?"

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A wave has a wavelength of 5 meters and a frequency of 3 hertz. What is the speed of the wave?

otez555 [7]

A sound wave in a steel rail has a frequency of 620 Hz and a wavelength of 10.5 ... Find the speed of a wave with a wavelength of 5 m and a frequency of 68 Hz.

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Which example describes a nonrenewable resource?

In-s [12.5K]

The refineries that use the oil to put in their cars as gasoline and then after a while the oil will disappear and go away and that's what a nonrenewable resource would be

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3 years ago

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