Short answer, 10kg, it must be the same mass as Ball 1
Long calculation to prove the answer:
M1 = Mass of Ball 1
M2 = Mass of Ball 2
U1 = Initial speed of Ball 1
U2 = Initial speed of Ball 2
V1 = Final speed of Ball 1
V2 = Final speed of Ball 2
M1U1 + M2U2 = M1V1 + M2V2
10 x 20 + M2 x 20 = 10 x 40 + M2 x 0
200 + 20M2 = 400
20M2 = 200
M2 = 200 / 20
M2 = <u>10 kg</u>
Alternatively you could say that because the velocity of ball 1 increased by the exact velocity of ball 2, their masses must be equal, so both ball 1 and 2 are 10 kg.
Answer:
The wavelength of the 320 Hz sound waves in the column of air is 1070 mm.
Explanation:
To solve the question, we note that the tube acts as a pipe with one end closed and that a stationary wave is formed in the tube from the top, to the bottom of the tube and back.
The simplest and the first wave form in the tube has length L = Lambda/4
That is, a node at the closed end and an antinode at the open end
The second stationary wave is given by
l + 535 mm= 3/4×lambda
However v = f×lambda
f = v/lambda = v/(4l)
Therefore
Lambda/4 + 535 mm = 3/4lambda
Or 535 mm = 3/4lambda -Lambda/4 = lambda/2
Therefore, lambda = 2×535 mm = 1070 mm
The wavelength = 1070 mm
Answer is A, Sound waves will travel faster on warm air because collisions of molecules of air in warm air are greater.
138.176cm is how much it equals to
Answer:
14.5m/s
Explanation:you had to divide 2.5s divide that by 1.8