The momentum of a body is increased by 25%. The kinetic energy is increased by about
25 %
5 %
56 %
38 %
A particle of mass m = 5 units is moving with a uniform speed v = m in the XOY plane along the line Y = X + 4. The magnitude of the angular momentum about origin is
zero
60 unit
7.5 unit
A string of density 7.5 g cm3 and area of cross-section 0.2 mm2 is stretched under a tension of 20 N. When it is plucked at the mid-point, the speed of the transverse wave on the wire is
116 ms-1
40 ms-1
200 ms-1
80 ms-1
A work of 2 x 10-2 J is done on a wire of length 50 cm and area of cross-section 0.5 mm2. If the Young's modulus of the matenal of the wire is 2 × 1010 Nm-2, then the wire must be
elongated to 50.1414 cm
contracted by 2.0 mm
stretched by 0.707 mm
of length changed to 49.293 cm
C.
stretched by 0.707 mm
The work done by wire is stored as potential energy in the wire
Water rises in a capillary tube to a height h. Choose false statement regarding capillary rise from the following
On the surface of Jupiter, height will be less than h
In a lift moving up with constant acceleration height is less than h
On the surface of moon the height is more than h
In a lift moving down with constant acceleration height is less than h
The mstantaneous displacement of a simple harmonic oscillator is given by . Its speed will be maximum at the time
A particle of mass 5 g is executing simple harmonic motion with amplitude of 0.3 m and time period s. The maximumvalue of the force acting on the particle is
5 N
4 N
0.15 N
0.3 N
In a gas, two waves of wavelengths 1 m and 1.01 m are superposed and produce 10 beats in 3 s. The velocity of sound in the medium is
300 m/s
336.7 m/s
360.2 m/s
270 m/s
The pressure inside two soap bubbles is 1.01 and 1.02 atmosphere respectively. The ratio of their respective volumes is
2
4
6
8
In a certain region of space there are only 5 molecules per cm3 on an average. The temperature there is 3 K.The pressure of this dilute gas is (k = 1.38 x 10-23 J/K)
20.7 × 10-17 N/m2
15.3 × 10-15 N/m2
2.3 × 10-10 N/m2
5.3 × 10-5 N/m2