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True [87]
3 years ago
6

a pulley system has an efficiency of 74.2%. If you perform 200 J of work how much useful work does the pulley perform

Physics
1 answer:
oksian1 [2.3K]3 years ago
3 0

<u>Answer:</u>

148.4 J

<u>Explanation:</u>

We are given that the efficiency of a pulley system is 74.2% and we are to calculate the useful work done if we perform 200 J of work

We know that efficiency is basically the measure of how efficient a process is.

The formula of efficiency is given by:

<em>Efficiency = useful energy output / total energy input</em>

So substituting the given values in the above formula:

0.742 = Useful energy / 200 J

Useful energy = 148.4 J

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A roofer needs to get shingles onto a roof. Pulling the shingles up manually uses 1,549 N or force. The roofer decides to use a
joja [24]

Answer:

Mechanical advantage of pulleys = 3.47 (Approx)

Explanation:

Given:

Manual force = 1,549 N

Pulleys force = 446 N

Find:

Mechanical advantage of pulleys

Computation:

Mechanical advantage of pulleys = Manual force / Pulleys force

Mechanical advantage of pulleys = 1,549 / 446

Mechanical advantage of pulleys = 3.4730

Mechanical advantage of pulleys = 3.47 (Approx)

3 0
4 years ago
Typically, a bullet leaves a standard .50-caliber rifle (29.0-in. barrel) at a speed of 853 m/s. If it takes 1.2 milliseconds to
nirvana33 [79]
To find what a is, consider the equation v=at (v=velocity, a=acceleration, t=time interval), making a=v/t. Take the given v of 853m/s, and divide that by your time IN SECONDS, so 1.2ms=1.2*10^-3s.

a=(853)/(1.2*10^-3)=7.11*10^5 m/s^2.

Now Having F=ma, where a is your acceleration, and m=mass (which is 49*10^-3 kg),

F=(49*10^-3)(7.11*10^5)=3.48*10^4 N

Hope this helps!
3 0
4 years ago
Of the following approximate conversions of celsius into fahrenheit, which is most accurate? a. 24°c almost-equals 75.9°f b. 2°c
Softa [21]

The most accurate among the options is 13°c almost-equals 55.0°f, when you round down 55.4, you get 55.0

Hence, option D) is the most accurate.

<h3>What is Scale of Temperature?</h3>

Scale of temperature is simply a method used in calibrating the physical quantity of temperature in metrology.

Conversion of Celsius into Fahrenheit, Formula is expressed as;

Degree = (0 × 9/5) + 32 = Fahrenheit

First we check each option;

A) 24°c almost-equals 75.9°f

24°C = (24 × 9/5) + 32 = 75.2°F

B) 2°C almost-equals 35.8°f

2°C = (2 × 9/5) + 32 = 35.6°F

C) 34°C almost-equals 92.7°f

34°C = (34 × 9/5) + 32 = 93.2°F

D) 13°c almost-equals 55.0°f

13°C = (13 × 9/5) + 32 = 55.4°F

The most accurate among the options is 13°c almost-equals 55.0°f, when you round down 55.4, you get 55.0

Hence, option D) is the most accurate.

Learn more about temperature scales here: brainly.com/question/88395

#SPJ4

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Type of tissue that helps with movement.Immersive Reader
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The answer is b. muscle
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3 years ago
Mary slides down a snow-covered hill on a large piece of cardboard and then slides across a frozen pond at a constant velocity o
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Explanation is in the file

tinyurl.com/wtjfavyw

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