What is the mass of an object that creates 33,750 joules of energy by traveling at 30 m/sec?
2 answers:
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Answer : The correct option is, (d)
Explanation :
In this problem we assumed that heat given by the hot body is equal to the heat taken by the cold body.
where,
= specific heat of copper =
= specific heat of water =
= mass of copper = 120 g
= mass of water = 300 g
= final temperature of mixture =
= initial temperature of copper = ?
= initial temperature of water =
Now put all the given values in the above formula, we get:
Therefore, the temperature of the kiln was,
Answer:
Electric field,
Explanation:
It is given that,
Magnitude of charge,
Force experienced,
We need to find the electric field at the origin. It is given by :
So, the electric field at the origin is . Hence, this is the required solution.
Answer:
1.36
Explanation:
= Index of refraction of air = 1
= Index of refraction of plastic = ?
i = angle of incidence in air = 32.0° deg
r = angle of refraction in plastic = 23.0° deg
Using Snell's law
Sini =
Sinr
(1) SIn32.0 = Sin23.0
= 1.36