A ball is dropped from a height of 16 feet. Each time it drops h feet, it rebounds 0.81h feet. Find the total distance traveled by the ball.

Answers

Answer 1
Answer: The first drop makes the ball travel 16 m.
Then the maximum height decreases to 16 x 0.81
And the distance traveled is twice the distance traveled.
If we make a pattern, this forms a geometric progression in which the common ratio is 0.81 and the first term is 16.
The sum of this series: a / (1 - r)
= 16 ( 1 - 0.81)
= 84 feet
This is the upward height, and the ball returns every time so:
Total distance = 84 x 2
= 168 feet

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region of ice that is covered with a thin layer
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Answers

the vector diagram has been attached

Which of these are considered an oxidizing mutagenic agent? x–rays benzopyrene gamma rays

Answers

X - rays are considered an oxidizing mutagenic agent. X-rays are high energy electrons that can cause damage when exposed under extreme conditions. The best technology that can block it is t using a lightweight type of metal foam. It can take in high energy collisions which also exhibits high forces. it does not only block x-rays but also, neutron radiation and gamma rays.

Air is made of 80% nitrogen and 20% oxygen by volume. The densities of air and oxygen is 1.29kgm^-3 and 1.43kgm^-3 respectively. What is the density of nitrogen? Please specify your soultion,thank you!

Answers

Volume % = mole %

Molar mass of oxygen = 32kg/kmol

Molar mass of nitrogen = 28 kg/kmol

 

Density of nitrogen = Density of oxygen x molar mass of oxygen x molar ratio of air x molar mass of nitrogen

Density of nitrogen = (1.43kgm^-3)(1 kmol O2/32 kg O2)(80 kmol N2/ 20 kmol O2)(28 kg N2/1 kmol O2) = 5.01 kg/m3

Matter is anything that

Answers

takes place in the space and it can be fluid or solid

Which force causes a wagon to speed up as it rolls down a hill?

Answers

Answer: The correct answer is force of gravity.

Explanation:

Gravity is the force with which one body attracts the other body.

It goes down a hill with the increase in the kinetic energy. The kinetic energy is due to the motion of a wagon.

At the hill the gravity is lesser in comparison to the gravity on the surface of the earth.

When a wagon rolls down a hill it speeds up. Here, the earth attracts the wagon with the force of gravity. It accelerates down a hill with an acceleration due to gravity.

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What lever has resistance between the axis (fulcrum) and the force (effort)?

Answers

Third class lever it has the exact resistance

Answer:

second class lever

Explanation: