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MaRussiya [10]
3 years ago
14

Which of the following is a simple machine? A. wedge B. meat grinder C. car D. bicycle

Physics
1 answer:
kati45 [8]3 years ago
4 0
I think the answer is D. Bicycle
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A stone dropped in a pond sends out a circular ripple whose radius increases at a constant rate of 4 ft/sec. After 12 seconds, h
Natali5045456 [20]

Answer:

After 12 seconds, the area enclosed by the ripple will be increasing rapidly at the rate of 1206.528 ft²/sec

Explanation:

Area of a circle = πr²

where;

r is the circle radius

Differentiate the area with respect to time.

\frac{dA}{dt} = 2\pi r\frac{dr}{dt}

dr/dt = 4 ft/sec

after 12 seconds, the radius becomes = \frac{dr}{dt} X 12 = 4 \frac{ft}{sec}  X 12 sec = 48 ft

To obtain how rapidly is the area enclosed by the ripple increasing after 12 seconds, we calculate dA/dt

\frac{dA}{dt} = 2\pi r\frac{dr}{dt}

\frac{dA}{dt} = 2\pi (48)(4)

    dA/dt = 1206.528 ft²/sec

Therefore, after 12 seconds, the area enclosed by the ripple will be increasing rapidly at the rate of 1206.528 ft²/sec

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3 years ago
Giving lots of points
bekas [8.4K]

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wind turbine

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Compare and contrast offensive and defensive roles in team sports.
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In the offensive role, the players try to get a goal.
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The ozone layer protects us from the harmful effects of which type of radiation?
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Hey there

The ozone layer or ozone shield is a region of Earth's stratosphere that absorbs most of the Sun's ultraviolet radiation

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A friend tells you that a rowboat is propelled forward by the force of its oars against the water. First explain whether the sta
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It is correct, the action is paddling, where you move the water backwards, and the reaction is the boat moving forwards.
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