Entropy and the second Law of Thermodynamics
Dissolving salt into water lowers the temperature which the water freezes, or at which the ice melts
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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:
28.6 ohm
Explanation:
there is a 3rd resistor in series. voltage drop across the resistors will be equal to 60v
7*.2+7*.2 +.2x = 60
2.8+.2x = 60
.2x = 57.2
x = 28.6
Explanation:
Given that,
Initial length of simple pendulum,
Initial time period,
We need to find the length of the simple pendulum when the period is exactly 1 second.
We know that the time period of simple pendulum is given by :
Put all values and find L₂
So, the length of the pendulum with a period of exactly one second is 25 cm.