Answer:
(A) -2940 J
(B) 392 J
(C) 212.33 N
Explanation:
mass of bear (m) = 25 kg
height of the pole (h) = 12 m
speed (v) = 5.6 m/s
acceleration due to gravity (g) = 9.8 m/s
(A) change in gravitational potential energy (ΔU) = mg(height at the bottom- height at the top)
height at the bottom = 0
= 25 x 9.8 x (0-12) = -2940 J
(B) kinetic energy of the Bear (KE) =
= = 392 J
(C) average frictional force =
- change in KE (ΔKE) = initial KE - final KE
- ΔKE = -
- when the Bear reaches the bottom of the pole, the final velocity (Vf) is 0, therefore the change in kinetic energy becomes ΔKE = - 0 = 392 J
\frac{-(ΔKE+ΔU)}{h}[/tex] =
= = 212.33 N
Because they perform different functions
I think in parallel circuits.
Since there are no choices given, I will give examples regarding energy. <span>Solar power
is a renewable energy resource. Its source is from the sun and the batteries
that needs this power does not run out of energy. Wind power is a renewable
energy resource. The wind is always present in the earth’s atmosphere. Tidal
power is a renewable energy resource. The energy that the waves produce can
generate electricity. It is a renewable resource. Nuclear energy uses nuclear
reaction to create and produce electricity. Nuclear fission is the main nuclear
reaction and it uses uranium. It is a renewable energy resource.</span>