Which forces include attractive and repulsive interactions? A. electric and magnetic forces B. static friction and air resistanc
2 answers:
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Answer:
Explanation:
It is given that,
Mass of the car, m = 763 kg
Speed of the car, v = 26 m/s
Mass of the iron, m' = 15 kg
Specific heat of iron, c = 450 J/kg
When the car is in motion, it will possess kinetic energy. It is given by :
K = 257894 J
Since, energy is absorbed by the brakes. The kinetic energy of the car is absorbed by the brakes. So,
is the increase in temperature of the brakes
So, the increase in temperature of the brakes is 38.20 degrees Celsius. Hence, this is the required solution.
Answer:
We can increase the strength by increasing current in the wire or increasing the number of turns of the coil around an iron core .
Explanation:
The magnetic strength due to current carrying conductor carrying current I and having N number of turns is given by
B =
is vacuum permeability .and its value is equal to
.so from the above equation we can see that magnetic strength is directly proportional to the current through wire and no. of turns .
Answer:
8 minutes and 20 seconds
Explanation:
Average Distance between Earth and Sun: 150 million km = km
Velocity of light:
Time = Distance/Speed
or Time = /
= 5 * 100
= 500 seconds
⇒ Time = 8 minutes and 20 seconds