The net force acting is not zero on
a retarding train
a ball falling with terminal velocity
a kite held stationary
a truck moving with constant velocity
An engine of power 58.8 kW pulls a train of mass 2x105 kg with a velocity of 36 kmh-1. The coefficient of friction is
0.3
0.03
0.003
0.0003
If a capillary tube of radius r is immersed in a liquid, then the liquid rises to a height h. The corresponding mass of liquid column is m. The mass of water that would rise in another capillary tube of twice the radius is
2 m
5 m
3 m
4 m
In a horizontal pipe of non-uniform cross-section, water flows with a velocity of 1 ms-1 at a point where the diameter of the pipe is 20 cm. The velocity of water (in ms-1) at a point where the diameter of the pipe is 5 cm is
64
24
16
32
A spherical ball of diameter 1 cm and density 5 x 103 kg m-3 is dropped gently in a large tank containing viscous liquid of density 3 x103 kg m-3 and coefficient of viscosity 0.1 Ns m-2. The distance, the ball moves in 1 s after attaining terminal velocity is (g =10 ms-2)
A.
Given, diamter of spherical ball (d) = 1 cm = 0.01 m
Radius of spherical ball (r) =
Density of spherical ball (ρ) = 5 × 103 kg m-3
Density of liquid (σ) = 3 × 103 kg m-3
Coefficient of viscosity (η) = 0.1 N sm-2
We know that,
The Zeroth law of thermodynamics leads to the concept of
internal energy
heat content
pressure
temperature
The difference between the specific heats of a gas is 4150 Jkg-1 K-1. If the ratio of specific heat is 1.4, then the specific heat at constant volume of the gas (in J kg-1 K-1) is
1037.5
2037.5
8300
10375
The Carnot cycle of a reversible heat engine consists of
one isothermal and two adiabatic processes
two isothermal and one adiabatic processes
two isothermal and two adiabatic processes
two isobaric and two isothermal processes
Two equal masses hung from two massless springs of spring constants k1 and k2. They have equal maximum velocity when executing simple harmonic motion. The ratio of their amplitudes is
The simple harmonic motion of a particle is given by x = a sin 2t. Then, the location of the particle from its mean position at a time 1/8th of a second is
a