We know that the motion of the Moon around the Earth is due
1 answer:
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Answer:
The velocity of the police car relative to earth is
Given:
time for flash generation of the inter galactic police car, t = 1.2 s
time between flashes as measured from earth, t' = 2.2 s
Solution:
Utilising Einstein's equation for time dilation to calculate the velocity of the police car, the equation is given by:
(1)
where, c = speed of light in vacuum =
re arranging eqn (1) for velocity, v:
(2)
Now, from eqn (2)
<span>The amount of heat energy needed to increase the temperature of a substance by </span>
<span> is given by:
</span>
<span>
where m is the mass of the substance, Cs is its specific heat capacity and </span><span> is the increase in temperature of the substance.
In this problem, we have a certain mass m of gold, with specific heat capacity </span>
<span>, to which we add Q=2825 J of energy. Its temperature increases by </span>
<span>. Therefore, if we re-arrange the previous equation, we can find the mass of the block of gold:
</span>
<span>
So, the correct answer is B.</span>
</span>
where m is the mass of the substance, Cs is its specific heat capacity and </span>
In this problem, we have a certain mass m of gold, with specific heat capacity </span>
</span>
So, the correct answer is B.</span>