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almond37 [142]
3 years ago
8

How fast is a ball rolling if it contains 98 j of kinetic energy and has a mass of 4kg

Physics
1 answer:
zysi [14]3 years ago
4 0

Answer:

the ball is rolling 7m/s

Explanation:

Formula for kinetic energy: 1/2mv²

K = 1/2mv²

98 = 1/2(4)v²

98 = 2v²

49 = v²

√49 = v

7 = v

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Answer:

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<em />

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Explanation:

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8 0
3 years ago
What is the speed that the Earth orbits the Sun?
iris [78.8K]

Answer:

30 Kilometers per second

4 0
3 years ago
How many 1140 nm long molecules would you have to line up end to end to stretch a distance of 158 miles?
dezoksy [38]

Answer:

221754385964.9123

Explanation:

Convert miles to nanometer

1 mile = 1.6 km

1 km = 1×10³×10³×10³×10³ nm

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So,

158 miles = 158×1.6×10¹² = 252.8×10¹² nm

Length of each molecule = 1140 nm

Number of molecules = Total length / Length of each molecule

\text{Number of molecules}=\frac{252.8\times 10^{12}}{1140}\\\Rightarrow \text{Number of molecules}=221754385964.9123

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3 0
3 years ago
Which items are matter?
Mumz [18]
Without being provided a list of items, I would have to generally say that everything around you is matter. There are a few exceptions to this list, but a general rule of thumb is anything you can touch, taste, smell or hold would be considered matter. Sound, light, time (Dr. Who may disagree) and heat would be considered non-matter items. 
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3 years ago
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mixas84 [53]

Answer:

400cos(60) = 200m/s

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v= 0.07m/s

8 0
2 years ago
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