Water is used to cool down automobile engines when they get hot. Why is water used as a coolant?
2 answers:
Explanation :
Water is used to cool down automobile engines when they get hot. It is used as a coolant because it has a high heat capacity. It is approximately equal to .
The heat capacity of a substance is defined as the change in temperature due to the addition and removal of heat. Its SI unit is joule per kelvin. It is also an extensive property of matter.
The specific heat of water shows that each gram of water can absorb or release 4.186 joules of heat.
In the case of water, it will soak up a large amount of heat and its do not increase by very large amount.
So, the correct option is (d) "Water has a high heat capacity".
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The mass on the spring is 0.86 kg
Explanation:
The period of a mass-spring system is given by the equation
where
m is the mass
k is the spring constant
In this problem, we have:
k = 88.7 N/m is the spring constant
The system makes 15 oscillations in 9.24 s: therefore, the period of the system is
Now we can re-arrange the first equation to solve for the mass:
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Answer:
1020 km
Explanation:
A complete rotation of the wheel equals a distance of 1 circumference.
The circumference is
where <em>d</em> is the diameter of the wheel.
300,000 rotations =
In kilometers, this is = 1017876/1000 km = 1020 km