Answer:
Explanation:
I can give you four for certain.
Copper
Gold
Silver
Aluminum
I think it is A. but then you can also produce your own energy
Answer:
6. 1516.67
2. -2.78
2. 1.54 mph
Explanation:
010)
Impulse = change in momentum
F Δt = m Δv
F (0.018 s) = (0.65 kg) (42 m/s − 0 m/s)
F = 1516.67 N
011)
Momentum before = momentum after
m u = (m + M) v
(1400 kg) (-13.9 m/s) = (1400 kg + 5600 kg) v
v = -2.78 m/s
012)
Momentum before = momentum after
m u = (m + M) v
(5 ton) (4 mph) = (5 ton + 8 ton) v
v = 1.54 mph
Answer:
The frequency heard by the observer is 2760.73 hertz. Explanation:
Frequency of source, f = 2640 Hz
Velocity of source,
The speed of sound, v = 343 m/s
Let f' is the frequency heard by the observer. According to Doppler's effect, the frequency of the observer is given by :
(as the source is moving towards observer)
f' = 2760.73 Hz
So, the frequency heard by the observer is 2760.73 hertz. Hence, this is the required solution.