If Mike does 25.5 J of work lifting a book 1.5 m onto a shelf what is the mass of the book in kilograms

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Answer 1

Answer: lifting the book means that the object gains gravitational potential energy. GPE=mass*gravitational field strength*height, ∴m=GPE/gh, m=25.5/10*1.5=1.7 kg

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A glass lying on table doesn't possess friction.why?

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becsud it's not moving

What is used to create sounds of different pitches and tones by musicians?

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The answer to the question that is being presented above would be musical instruments. These instruments are used to create sounds of different pitches and tones by musicians. They operate through being striked or 'sawed' to create vibrations that produce sound.

a warrior swings a slingshot in a horizontal circle above his head at a constant speed. The sling is 1.5 m long, and the stone has a mass of 50 g. The tension in the string is 3.3 N. When he releases the sling, what will the stone's speed be?

Answers

The speed of the stone when he releases the sling is equal to 9.95 m/s.

Given the following data:

Length of sling (radius) = 1.5 meter

Mass of stone = 50 grams to kg = 0.05 kg

Tension = 3.3 Newton

To determine the speed of the stone when he releases the sling:

First of all, we would solve for the angular velocity of the stone by applying

the law of conservation of momentum.

Tension in the string = Centrifugal force of the stone

$Tension = mrw^2$

$\omega = \sqrt{(Tension)/(mr) } \n\n\omega = \sqrt{(3.3)/(0.05 * 1.5) }\n\n\omega = √(44)$

Angular velocity = 6.63 rad/s

Now, we can determine the speed of the stone when he releases the sling:

$V = r\omega\n\nV=1.5 * 6.63$

Speed, V = 9.95 m/s

r = 1.5 m , m = 0.05 kg
Tension = Centrifugal force
T= mrw² , w = angular velocity
3.3 N = 0.05 x 1.5 x w²
w = 6.63 rps
Linear Velocity = rw = 1.5 x 6.63 = 9.945 m/s

The momentum of a bald eagle in flight is calculated to be 345. The mass of the eagle is 5.0 kg. What is the magnitude of the velocity of the eagle?

Answers

Answer : v = 69 m/s.

Explanation :

It is given that,

The momentum of a bald eagle in flight, $p = 345\ Kgm/s$

Mass of the eagle, m = 5 kg

We know that the momentum of any object is defined as the product of mass and the velocity with which it is moving.

$p=mv$

$v=(p)/(m)$

$v=(345\ kgm/s)/(5\ kg)$

$v=69\ m/s$

The velocity of the eagle is 69 m/s.

Hence, this is the required solution.

The formula to find the magnitude of velocity is:

▲v= ▲M/m

▲v=Velocity Change
▲M=Momentum Change
m=Mass

Plug in the information;

▲v=345/5

The answer is 69

As you (increase, decrease) in altitude, air pressure decreases.

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Answer:

as you increase in altitude, air pressure decreases

Describe Earth's three global wind belts

Answers

Polar Easterlies: From 60-90 degrees latitude.
Prevailing Westerlies: From 30-60 degrees latitude (aka Westerlies).
Tropical Easterlies: From 0-30 degrees latitude (aka Trade Winds).

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