Zain is standing on a bridge. He tosses a ball upwards, which rises, stops, and then falls all the way to the water (30 meters b
1 answer:
You might be interested in
Answer:
The temperature rise of the water is = 0.14 °c
Explanation:
Height = 60 m
Potential energy change ΔP =
ΔP = m × 9.81 × 60
ΔP = (588.6 × m) Joule
Since the Potential energy change is equal to the internal energy change or Enthalpy change.
ΔP = ΔH
Since ΔH = m × C × ΔT
⇒ ΔP = m × C × ΔT
Put all the values in above formula we get
⇒ 588.6 × m = m × 4184 × ΔT
⇒ ΔT= 0.14 °c
Therefore the temperature rise of the water is = 0.14 °c
Answer:
5.05 ms⁻²
Explanation:
(check the graph)
when the block is pulled with a force , <em>force of kinetic friction (Fr)</em> appears resisiting the motion.
Fr = μR = μ*mg (where g- gravitational acceleration = 9.8 ms⁻²)
= 0.25 * 2 * 9.8
=4.9 N
According to Newton's second law of motion
we can apply F = ma to the motion assuming the block is moving right
F = ma (a - acceleration)
15 - 4.9 = 2*a
a = 5.05 ms⁻²
