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professor190 [17]
2 years ago
8

A cube with sides of length 2cm has a mass of 7.36g . calculate the density of the cube

Physics
1 answer:
kondor19780726 [428]2 years ago
7 0
Density = 7.36 grams ÷ (2 cm × 2 cm × 2cm) = 0.92 g/cm^3

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A person hears the echo of his own voice from a distant hill after 2 seconds. How far away is the person from the hill, if the s
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Answer: 330 m

Explanation:

The speed of sound V is defined as the distance traveled by the sound wave d in a especific time t:  

V=\frac{d}{t}  

Where:  

V=330 m/s is the speed of sound  

t=\frac{2 s}{2}=1 s is half the time the sound wave travels since the person speaks, the sound wave hits the hill and then returns to the person again  as an echo

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So, we have to find d:

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3 years ago
A boat takes 3.0 hours to travel 50 km down a river, then 5.4 hours to return. Determine the speed of the water in the river.
Nutka1998 [239]

Answer:

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