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postnew [5]
3 years ago
9

After a student shoves a book across a flat table, it begins to slow down. Why?

Physics
1 answer:
Dovator [93]3 years ago
6 0

Answer:

  • <u>The force of friction opposes the motion of an object, causing moving objects to lose energy and slow down. When objects move through a fluid, such as air or water, the fluid exerts a frictional force on the moving object. The frictional force from a fluid is called a drag force.</u>
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To drive a typical car at 40 mph on a level road for onehour requires about 3.2 × 107 J ofenergy. Suppose one tried to store thi
Ainat [17]

Answer:

\omega=943\ rad/s

Explanation:

Given that,

Speed of the car, v = 40 mph

Energy required, E=3.2\times 10^7 J

Radius of the flywheel, r = 0.6 m

Mass of flywheel, m = 400 kg

The kinetic energy of the disk is given by :

E_k=\dfrac{1}{2}I\omega^2

I is the moment of inertia of the disk, I=\dfrac{mr^2}{2}

\omega^2=\dfrac{2E_k}{I}

\omega^2=\dfrac{2E_k}{\dfrac{mr^2}{2}}

\omega^2=\dfrac{2\times 3.2\times 10^7}{\dfrac{400\times (0.6)^2}{2}}

\omega=942.80\ rad/s

or

\omega=943\ rad/s

So, the angular speed of the disk is 943 rad/s. Hence, this is the required solution.

8 0
4 years ago
Which of the following is an SI base unit for measuring mass?
Dimas [21]

Answer:

I think its Pound or a gram

8 0
2 years ago
At the bottom of a frictionless ramp, a 2kg mass reaches a speed of 9 m/s, how high is the top of the ramp? *
noname [10]
V=√(2gs)
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3 0
3 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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2 years ago
Advantages of wave model
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Explanation:

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