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sesenic [268]
3 years ago
15

ADvantage of friction

Physics
1 answer:
kondor19780726 [428]3 years ago
7 0

Answer:

1. Friction enables us to walk freely.

2. It helps to support ladder against wall.

3. It becomes possible to transfer one form of energy to another.

4. Objects can be piled up without slipping.

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Scientists have learned about the structure of Earth's interior by
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I WILLLL GIVEEEEEE YOU BRAINLYYYYY!!!!!!!!!! Write your own definition of Scientific Law and a Scientific Theory in your own wor
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3 years ago
A small rock is thrown vertically upward with a speed of 27.0 m/s from the edge of the roof of a 21.0-m-tall building. The rock
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Answer:

A. 33.77 m/s

B. 6.20 s

Explanation:

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Gravity g=-9.8 m/s^2; Initial position (roof) y=0; Final Position street y= -21 m

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V_{final}^{2}=V_{initial}^{2}+2g(y_{final}-y_{initial})\\V_{f}^{2}=27^{2}-2*9.8(-21-0)=33.77 m/s

Part B. Using Kinematics expression for distance, time and initial velocity

y_{final}=y_{initial}+V_{initial}t+\frac{1}{2} g*t^{2}\\==> -0.5*9.8t^{2}+27t+21=0\\==> t_1 =-0.69 s\\t_2=6.20 s

Since it is a second order equation for time, we solved it with a calculator. We pick the positive solution.

8 0
3 years ago
1.Particles are spaced the farthest apart in _____ and are the closest in ______. Select the answer that best completes the sent
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Answer:

gases; solids.

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3 years ago
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