Physics Test 66...

The radius of the moon is 1.7×10⁶ m and its mass is 7.35×10²² kg. What is the acceleration due to gravity on the surface of the moon?

Given,

G =  6.67×10^-11 Nm² kg ^-2

A body cools from 50^∘C to 49^∘C in 5 s. How long will it take to cool from 40^∘C to 39^∘C? Assume the temperature of surroundings to be 30^∘C and Newton's law of cooling to be valid.

Argon gas is adiabatically compressed to half of its volume. If P,V and T represent the pressure, volume and temperature of the gaseous system respectively, then the correct equation representing the process is:

A concave spherical surface of radius of curvature 10 cm separates two medium X and Y of refractive index 4/3 and 3/2 respectively. If a real object is placed along principal axis in medium X then,

Calculate the force of attraction between two spheres each of mass 1 kg separated by 3 m and G=6.67×10⁻¹¹ N m2 kg⁻².

The electric field of a plane electromagnetic wave varies with time of amplitude 2 V m⁻¹ propagating along z -axis. The average energy density of the magnetic field is (in Jm^-3):

The momentum of a body is 800.00 kg m/s and its mass is 40.00 kg. Find its kinetic energy.

Two bodies, A (of mass 1 kg ) and B (of mass 3 kg ), are dropped from heights of 16 m and 25 m, respectively. The ratio of the times taken by them to reach the ground is:

The moon is observed from two diametrically opposite points A and B on Earth. The angle θ subtended at the moon by the two directions of observation is 1^∘54′. Given the diameter of the Earth to be about 1.276×10⁷ m, compute the distance of the moon from the Earth.

The fundamental frequency of a closed organ pipe is equal to the second overtone of an open organ pipe. If the length of the closed organ pipe is 15 cm, then the length of the open organ pipe is: