Which is true about Earth's energy budget?
1 answer:
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Brass requires more energy than silver
Aluminum requires more energy than copper
Aluminum requires more energy than brass
Explanation:
The specific heat capacity of a substance indicates the amount of heat energy required to raise 1 kg of that substance by 1 degree in temperature.
Mathematically:
where
Q is the heat supplied to the substance
m is the mass of the substance
is the change in temperature
Therefore, the higher the specific heat capacity of a substance, the more energy is needed to increase its temperature.
Here we can compare the specific heat capacity of the materials mentioned:
Silver:
Brass:
Platinum:
Aluminium:
Copper:
Therefore, the correct statements are:
Brass requires more energy than silver
Aluminum requires more energy than copper
Aluminum requires more energy than brass
Learn more about specific heat:
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A) The position at t = 2.0 sec is 43.0 m east
B) The position is 55 m east
Explanation:
A)
In order to solve the problem, we take the east direction as positive direction.
We know that:
- at t = 0, the motorcyclist is at a position of
- at t = 0, the initial velocity of the motorcyclist is east
- The acceleration of the motorcyclist is constant and it is
Since the motion is a uniformly accelerated motion, the position of the motorcylist is given by the expression
where t is the time.
Substituting t = 2.0 s, we find the position:
B)
The velocity of the motoryclist can be found by calculating the derivative of the position. Therefore, it is:
where:
is the initial velocity
is the acceleration
We want to find the time t at which the velocity is
v = 25 m/s
Solving the equation for t,
And therefore, the position at t = 2.5 s is:
Learn more about accelerated motion:
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