Answer:
0.122 m/s
Explanation:
mass of first train, m1 = 150,000 kg
initial velocity of first train, u1 = 0.3 m/s
mass of second train, m2 = 110,000 kg
initial velocity of second train, u2 = - 0.120 m/s
let the velocity of coupled mass after the collision is v.
Use the conservation of momentum
Momentum of trains before collision = Momentum of trains after collision
150000 x 0.3 - 110000 x 0.120 = (150000 + 110000)v
45000 - 13200 = 260000 v
31800 = 260000 v
v = 0.122 m/s
Thus, they travel with the speed of 0.122 m/s towards right after collision.
True. I think.................
Explanation:
It is given that,
Work done, W = 240 J
Heat removed, Q = 610 J
(a) The refrigerator's coefficient of performance is given by :
COF = 2.54
(b) Let Q' is the heat per cycle is exhausted to the kitchen. It is given by :
Q' = Q + W
Q' = 610 + 240
Q' = 850 J
Hence, this is the required solution.
Answer:
to help people breach in fresh air
Explanation:
When a charged balloon is brought near a conducting can, the electrons are pushed to the far side of the can. If another object touches the side of the can opposite the balloon, electrons flow into the other object, leaving the can positively charged