Answer:
50%
Explanation:
Efficiency = work out / work in
e = Fd / W
e = (2000 N) (2 m) / (8000 J)
e = 0.5
The effective mass of the system is 12 kg.
<u>Explanation:</u>
- The effective mass of the system is given by the expression,
= mₓ + 1/2 m₁ + 2/5 m₂
- In the above equations the subscript x denotes block B and the subscript 2 denotes the mass of the solid sphere and the subscript 1 denotes the pulley.
- Expressing the above functions with the data given below. we have,
= 6 kg + 1/2 (4 kg) + 2/5 (10 kg)
= 12 kg.
with the findings above we can conclude that the effective mass of the system is 12 kg
Answer:
Time = 4.1 s
Explanation:
Momentum = mv = (12000)(4.25) = 51000 kg m/s
Momentum = Impulse (mv = ft) so
51000 = (9200)t
t = (51000)/(9200) = 5.54 seconds
Impulse of the current and the engine must equal so (ft = ft)
51000 = (12500)t
t = (51000)/(12500) = 4.08
But accounting for significant figures, time equals 4.1 seconds
Animals like bats and whales use something called echolocation (sounds or echoes that travel to the other animal) these echoes can let one animal let another one know that danger is near or that food is nearby etc it's like a telephone line
Facing disagreement forces scientists to prove their theories more conclusively.
