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3 years ago

A ball of mass 1.84 kg is dropped from a height y, =

Physics

1 answer:

DochEvi [55]3 years ago

3 0

Answer:

11.408 joules

Explanation:

soln

From the question above

Mass of ball = m = 1.84kg

Height of ball when dropped = 1.49m

Height of ball when it bounces back up = 0.87m

Recall

Potential energy (P.E) = mass × height × g

Kinetic energy(K.E) = 1/2 × mass × (velocity)²

Mechanical energy = K.E + P.E

M.E lost = M.E when ball dropped – M.E when ball bounces back up

Recall that g = acceleration due to gravity = 10ms²

P.E/K.E when ball dropped = 1.84 × 1.49 × 10

P.E/K.E when ball dropped = 27.416J

P.E/K.E when ball bounces back = 1.84 × 0.87 × 10

P.E /K.Ewhen ball bounces back = 16.008J

Since P.E = K.E

M.E when ball dropped = 27.416J

M.E when ball bounces back = 16.008J

Therefore,

M.E lost = 27.416 - 16.008

M.E lost = 11.408Joules

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Thirty three degrees

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2 years ago

From what height must an oxygen molecule fall in a vacuum so that its kinetic energy at the bottom equals the average energy of

alexandr1967 [171]

Answer:

The value is $h = 11930 \ m$

Explanation:

From the question we are told that

The temperature is $T = 300 \ K$

Generally the root mean square speed of the oxygen molecules is mathematically represented as

$v = \sqrt{\frac{3 * R * T }{M} } = \sqrt{ 2 * g * h }$

Here R is the gas constant with a value $R = 8.314 \ J\cdot K^{-1} \cdot \ mol^{-1}$

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$\frac{3 * 8.314 * 300 }{0.032} = 2 * 9.8 * h$

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3 years ago

True or False:In a current, electrons will always flow from negative to positive.

DIA [1.3K]

It should be true: electrons low from negative toward positive to negative toward positive because opposite charges attract each other.

I hope this was correct

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3 years ago

Read 2 more answers

Energy conservation

balandron [24]

Answer:

7.328m/s

Explanation:

Given parameters:

height of table = 0.68m

final velocity of the ball = 6m/s

Unknown:

Initial velocity of ball = ?

Solution:

To solve this problem, we are going to employ the appropriate motion equation.

We must understand that this fall occurs in the presence of gravity;

V = U + 2gH

Where;

V is the final velocity

U is the initial velocity

g is the acceleration due to gravity

H is the height of the pool table

Since U is the unknown, let us make it the subject of the expression;

U = V - 2gH

U = 6 - (2 x 9.8 x 0.68) = 7.328m/s(deceleration)

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3 years ago

In what fundamental way did the work of Galileo differ from his predecessors who had thought about the sky?

kompoz [17]

Answer: The correct answer is:

Galileo used instruments and experiments to show him what nature was doing, instead of relying on pure logic

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Galileo can be considered as one of the precursors of experimentation and the scientific method. A method that doesn't rely on "common sense" and rationalization and logic, but instead is fuelled by a disposition of skepticism and rather makes claims about reality based on experimentation and empirical data shows.

Galileo differed from his predecessors because he actually used and developed instruments and method to reliable measure and observe what nature was doing, instead of relying on pure logic.

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