To solve this problem it is necessary to apply the concepts related to energy conservation.
In this case the kinetic energy is given as
Where,
m = mass
v= Velocity
In the case of heat lost energy (for all 4 wheels) we have to
m = mass
Specific Heat
= Change at temperature
For conservation we have to
Therefore the temperature rises in each of the four brake drums around to 47°C
I think it is B because it seems like the most valid choice.
Answer:
150J
Explanation:
work output/work input=100%
so just make work output the subject
Answer:
0.5mi/min
Explanation:
Velocity = change in distance/time taken
Velocity= (5-0)/(20-10)=5/10=0.5mi/min
The final kinetic energy of the skateboarder after she freewheels and did work against friction on the flat section of the path is 4,600 J.
<h3>
Conservation of energy</h3>
The final kinetic energy of the stakeboarder is determined by applying the principle of conservation of energy as shown below;
ΔK.E = -W
K.Ef - K.Ei = -W
where;
- K.Ef is the final kinetic energy
- K.Ei is the initial kinetic energy
- W is work done
K.Ef = K.Ei - W
K.Ef = 5,000 J - 400 J
K.Ef = 4,600 J
Thus, the final kinetic energy of the skateboarder is 4,600 J.
Learn more about kinetic energy here: brainly.com/question/25959744
