Physics Test 121

A point P (R √3,0,0) lies on the axis of a ring of mass M and radius R. The ring is located in y-z plane with its centre at origin O. A small particle of mass m starts from P and reaches O under gravitational attraction only. Its speed of O will be

A particle undergoing SHM has the equation : x = A sin (ω + φ ), where x represents the displacement of the particle. The kinetic energy oscillates with time period

The phase difference between the two simple harmonic oscillations

y₂ = sin (ωt) + cos (ωt)

Pressure versus temperature graph of an ideal gas of equal number of moles of different volumes are plotted as shown in figure. Choose the correct alternative

A system undergoes a cyclic process in which it absorbs Q₁ heat and gives out Q₂ heat. The efficiency of the process is η and work done is W. Select the correct statement

A cyclic process for 1 mole of an ideal gas is shown in the V-T diagram. The work done in AB,BC and CA, respectively is

Which of the following law states that “good absorbers of heat are good emitters” ?

A cylinder of radius R, made of a material of thermal conductivity k₁, is surrounded by a cylindrical shell of inner radius R and outer radius 2R. The shell is made of a material of thermal conductivity k2. The two ends of the combined system are maintained at two different temperatures. There is no loss of heat across the cylindrical surface and the system is in steady state. The effective thermal conductivity of the system is

If you set up the seventh harmonic on a string fixed at both ends,how many nodes & antinodes are set up in it

A small source of sound moves on a circle as shown in figure and an observer in standing on O. Let n₁, n₂ and n₃ be the frequencies heard when the source is at A,B and C respectively. Then