Mechanical Properties of Solids — Physics STD 11 Science — Question

What is the effect of solute on the surface tension of a liquid?

A car moving at a speed of 10m/s is accelerated at the rate of 2m/s². Find out the velocity after 6 sec.

Two blocks A and B of mass m_A and m_B respectively are kept in contact on a frictionless table. The experimenter pushes the block A from behind so that the blocks accelerate. If the block A exerts a force F on the block B, what is the force exerted by the experimenter on A?

Given below are some examples of wave motion. State in each case if the wave motion is transverse, longitudinal or a combination of both:
(a) Motion of a kink in a longitudinal spring produced by displacing one end of the spring sideways.
(b) Waves produced in a cylinder containing a liquid by moving its piston back and forth.
(c) Waves produced by a motorboat sailing in water.
(d) Ultrasonic waves in air produced by a vibrating quartz crystal.

Three simultaneous forces, each of magnitude is 10N. If you are keeping an object in balance then draw a picture and show its direction.

There is a hole in a metal disc. If a metal disc is heated, what will happen to the size of the hole?

A cube of iron (density = 8000kg m^-3, specific heat capacity = 470J kg^-1 K^-1) is heated to a high temperature and is placed on a large block of ice at 0°C. The cube melts the ice below it, displaces the water and sinks. In the final equilibrium position, its upper surface just goes inside the ice. Calculate the initial temperature of the cube. Neglect any loss of heat outside the ice and the cube. The density of ice = 900kg m^-3 and the latent heat of fusion of ice = 3.36 × 10⁵J kg^-1.

What is the source of the non-mechanical waves?

A slab consists of two parallel layers of two different materials of the same thickness, having thermal conductivities K₁ and K₂. What is the equivalent thermal conductivity of the slab?