Mechanics | Relativity Answers

In a resonance column experiment radius of column tube is 2cm and the frequency of tuning fork is 512 Hz.if zero of meter scale coincide with the top end of resonance column then reading of position of water column at resonance (speed of sound=340m/s) nearly...
1) 18.3 cm. 2) 15.4 cm. 3) 30cm. 4) 16.6cm

A narrow uniform glass tube 80cm long and open at both ends is half immersed in mercury.then top of tube is closed and it is taken out of mercury.if column of mercury 22 cm long remain in tube, then the atmospheric pressure is..
1) 50. 2) 100. 3) 80. 4) 70.

Amplitude of vibrational of a particle in SHM with time period 1 sec is 0.05 m.average speed of the particle in one period is...
1) 0.4m/s. 2) 0.2m/s. 3) 0.1m/s. 4) 0.00m/s.

8 A man leaves the garage in his house and drives to a neighboring town which is twenty kilometers away from his house on sight-seeing. He returns home to his garage two hours after. What is his average velocity from home in km/h?
A 10
B 0
C 20
D 40

A ring of radius r is to be mounted on a wheel of radius R. The coefficient of linear expansion of the material of the ring is α. Young's modulus is Y, area of cross section is A and mass is m. Initially ring and wheel are at same temperature. (r<R)
a) the temperature through which the ring should be heated so that it can be mounted on the wheel
b) suppose the wheel with mounted ring starts rotating with angular velocity ω. The value of ω for which tension in ring becomes zero ?

A bullet it shot vertically into the air with an initial velocity of 109.8 m/s. Calculate the time (in seconds) taken for the bullet to reach its maximum height.

Take gravitational acceleration to be 9.81 m/s2.

A student project required the design of a projectile launcher to launch a cricket ball from the ground vertically upward as fast as possible. One particular test saw the ball launch with an initial velocity of 18.0 m/s. Determine the time (in seconds) it took for the ball to reach the teacher on its upward journey if she was standing on top of a 14.0 m high building.

Take gravitational acceleration to be 9.81 m/s2.

Two balls having masses m and 2m are fastened to two light strings of same length l which is held horizontally[say x axis, with the mass 2m at (l,0) and mass m at (-l,0)]. The strings are kept fixed at origin. This system is released from rest. Collision between the balls is elastic in nature.
a- find the velocities of the balls just after their collision and
b- how high will the balls rise after collision ?

a drop of some liquid of volume 0.04cm3 is placed on the surface of a glass slide.then another glass slide is placed on it such a way that the liquid forms a thin layer of area 20cm2 between the surface of the two slides.to separate the slids of force of 16*10^5dyne has to be applied normal to the surface.the surface tension of the liquid is in dyne/cm...

a) 60. b) 70. c) 80. d) 90

an uncharged parallel plate capacitor having dielectric constant k is connected to a similar air filled capacitor charge to a potential V .the two capacitor share the charge and the common potential is V1.the dielectric constant k is...