13.3N
20.0N
40.0N
80.0N
Correct answer is D
With P1 and P2 as shown (make a V.R of 2), the weight W = 40N * 2 = 80N
8.0 ms-2, 4,0 ms-2
4.0 ms-2, 8.0 ms-2
4.0 ms-2, 2.0 ms-2
2.0 ms-2, 4.0 ms-2
Correct answer is C
Acceleration = slope = AE/OE = 80/20 = 4m/s2
∴ acceleration and retardation = 4m/s2; 2m/s2
Vibration in a stretched spring cannot be polarized because they are
stationary waves
transverse waves
longitudinal waves
mechanical waves
Correct answer is C
In longitudinal waves, such as sound waves in a liquid or gas, the displacement of the particles in the oscillation is always in the direction of propagation, so these waves do not exhibit polarization.
the pressure of 3 moles of an ideal gas at a temperature of 27°C having a volume of 10-3m3 is
2.49 x 105-2
7.47 x 105-2
2.49 x 106-2
7.47 x 106-2
Correct answer is D
From the relation PV = nRT
V = 10-33; n = 3 moles; T = 27 + 273 = 300k
R = 8.3 j mol-1 K-1
=> P = nRT/V = 3 X 8.3 X 300/10-3 = 7.47 X 106 Nm-2
The phenomenon that makes sound persist when its source has been removed is known as
acoustic vibration
rarefaction
echo
reverberation
Correct answer is D
No explanation has been provided for this answer.
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