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iren2701 [21]
3 years ago
5

In creating his definition of horsepower, James Watt, the inventor of the steam engine, calculated the power output of a horse o

perating a mill to grind grain or cut wood. The horse walked in a 24-ft diameter circle, making, according to Watt, 144 trips around the circle in an hour.
(a) Using the currently accepted value of 746 watts for 1 horsepower, calculate the force (in pounds) with which Mr. Watt's horse must have been pulling. (See Appendix D for useful conversion factors.)
(b) Calculate the power output, in hp, of a 70-kg human being who climbs a 3.0-m-high set of stairs in 5.0 seconds.
Physics
1 answer:
Studentka2010 [4]3 years ago
8 0

Answer:

Part a)

F = 182.3 Lb

Part b)

P = 0.55 HP

Explanation:

Diameter of the circle = 24 ft

Diameter = 731.52 cm = 7.3152 m

now the horse complete 144 trips in one hour

so time to complete one trip is given as

t = \frac{3600}{144} s

t = 25 s

now the speed of the horse is given as

v = \frac{2\pi r}{t}

v = \frac{\pi(7.3152)}{25}

v = 0.92 m/s

Part a)

Now we know that the power is defined as rate of work done

it is given as

P = F v

746 = F(0.92)

F = 810.9 N

F = 182.3 Lb

Part b)

Work done to climb up to 3 m height is given by

W = mgh

now we have

Power = \frac{Work}{time}

P = \frac{mgh}{t}

P = \frac{(70kg)(9.81)(3)}{5.0s}

P = 412.02 Watt

now we know that 1 HP = 746 Watt

so we have

P = \frac{412}{746} = 0.55 HP

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alina1380 [7]

Answer:

773.25 Hz

Explanation:

Concept : In an open organ pipe in fundamental mode of vibration

wave length of wave λ = 2L

where L  is length of  the pipe

frequency   = velocity of sound / λ

Given values: fundamental frequency = 288 Hz

fluid is air. velocity of sound = 340 m/s

⇒ 288 = 340/2L

⇒L = 59.02 cm

The point to be noted is if the pipe is filled with helium initially at the same temperature, there would be change in the sound velocity .Then,  frequency of note produced will also be changed .

We know that velocity of sound is inversely proportional to  square root of molar mass of gas

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6 0
3 years ago
A 60 kg person runs up a 30° ramp with a constant acceleration. She starts from rest at the bottom of the ramp and covers a dist
Sladkaya [172]

We have that the instantaneous power is

P=1239.6W

From the question we are told that

A 60 kg person runs up a 30° ramp

distance of 15 m up the ramp in 5.8 s.

t = 4.0 s?

Generally the equation for the Force  is mathematically given as

F-mgsin\theta=ma\\\\F-60*9.8*sin30=60*a

Where

s=ut+1/2at^2\\\\15=+0.5*a*5.8^2\\\\\a=0.891\\\\

Therefore

F=60(0.891)+294\\\\F=347.5

Where

v=u+at\\\\v=3.567

Now

P=f*v\\\\P=347.50*3.567

P=1239.6W

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Answer:

The Good with the Bad

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Intended Consequences of Energy Conservation

In light of air pollution, the overuse of fossil fuels, and other issues efforts to conserve energy have been ramped up in the last few decades. Energy conservation can refer to reducing the amount of energy used or finding alternatives to traditional energy sources. There are several ways to conserve energy.

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Reducing Energy Use in Homes

We can conserve energy in our homes by unplugging and turning off lights and appliances when they are not in use. Obviously, there are some exceptions. Please don't go unplugging your refrigerator! However, many appliances like coffee makers and cell phone chargers can be unplugged when you're not using them. Homeowners can also better insulate their homes to reduce heat usage. Energy can also be conserved by buying appliances that are designed to be energy efficient. Both of these strategies save consumers money on their electric bills, so it's a win-win situation. Using less power overall reduces the pollution from power plants. When we use less energy in our homes, the power plants need to burn less fossil fuels. Burning less fossil fuels reduces pollution and helps conserve natural resources.

Save the Animals

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Answer:

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Explanation:

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Answer:

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