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2 years ago

If a ball is rolling across a floor at a constant speed is it accelerating

Physics

1 answer:

KATRIN_1 [288]2 years ago

8 0

You already told us that its speed is constant. That's one part of acceleration.

The other part of acceleration is the direction it's moving.

If it's rolling in a straight line, then there's no acceleration.

If it's curving left or right, then that's acceleration.

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the ocean

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What elements are solid liquid and gas at room temperature?

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1 year ago

The instrument used to measure the diameter of a thin wire is

Pie

micrometer is used to measure the diameter of a thin wire

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3 years ago

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A swimmer jumps from a waterfall thats is 8.5 m high from the lake below. How fast must he run horizontally to dive 2.5m away fr

Mashutka [201]

He must run at 6m/s

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2 years ago

The gravitational force, F, between an object and the Earth is inversely proportional to the square of the distance from the obj

andreev551 [17]

<h2>Weight of astronaut 2450 miles above the Earth is 80.38 pounds</h2>

Explanation:

Given that gravitational force, F, between an object and the Earth is inversely proportional to the square of the distance from the object and the center of the Earth.

$F=\frac{k}{r^2}$

Where F is gravitational force between an object and the Earth, r is the distance from the object and the center of the Earth and k is a constant.

Radius of Earth = 4000 miles

In case 1 an astronaut weighs 209 pounds on the surface of the Earth,

$209=\frac{k}{4000^2}\\\\k=3.344\times 10^9$

Now we need to find weight of astronaut 2450 miles above the Earth

r = 4000 + 2450 = 6450 miles

$F=\frac{k}{6450^2}\\\\F=\frac{3.344\times 10^9}{6450^2}=80.38pounds$

Weight of astronaut 2450 miles above the Earth is 80.38 pounds

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3 years ago