Answer:
The heater is not a perpetual motion machine.
Explanation:
A perpetual motion machine is a machine that can run forever without any energy inputs. That is, it delivers the same amount of energy as it uses. Such a machine is almost hypothetical because it is opposite to the second law of thermodynamics.
The heater mentioned in the question is not a perpetual motion machine because it delivers less energy than it requires. It uses 10 kW-h of electricity to produce 9 kW-h of heat according to the question.
Wrap wire around B the nails
Answer:
43.3 s
Explanation:
At the maximum height, the velocity is 0 m/s.
Given:
v₀ = 424 m/s
v = 0 m/s
a = -9.8 m/s²
Find: t
v = at + v₀
0 = -9.8t + 424
t ≈ 43.3
The time is approximately 43.3 seconds.
Answer:
A and C
Explanation:
drag (the area of lower air pressure behind the car when moving) and mostly air resistance (the work to push the air in front of us away to move through - the faster we go, the stronger the air resists to move aside).
Answer:
8.19m
Explanation:
Parameters given:
Pressure, P= 11.6 psi = 79979.185 Pa
Gauge pressure is given as:
P = h*d*g
=> h = P/(d*g)
Where
h = height of tank
d = density
g = acceleration due to gravity
Density of water = 997 kg/m³
Therefore, the height of the tank is:
h = 79979.185/(997 * 9.8)
h = 8.19m
