Physics Test 15...

The terminal velocity of a copper ball of radius 5 mm falling through a tank of oil at room temperature is 10 cm s^-1. If the viscosity of oil at room temperature is 0.9 kg m^-1 s^-1, the viscous drag force is:

If a soap bubble expands, the pressure inside the bubble

A spherical ball is dropped in a long column of a highly viscous liquid. The curve in the graph shown, which represents the speed of the ball (v) as a function of time (t) is

Read the assertion and reason carefully to mark the correct option out of the options given below:

Assertion: Young's modulus for a perfectly plastic body is zero.

Reason: For a perfectly plastic body, restoring force is zero.

Read the assertion and reason carefully to mark the correct option out of the options given below:

Assertion : Stress is the internal force per unit area of a body.

Reason : Rubber is less elastic than steel.

A steel rod 2.0 m long has a cross-sectional area of 0.30 cm² . It is hung by one end from a support, and a 550-kg milling machine is hung from its other end. Determine the resulting strain. Young's Modulus of Steel (Y) = 20×10¹⁰ Pa

A piece of copper having a rectangular cross-section of 15.2 mm × 19.1 mm is pulled in tension with 44,500 N force, producing only elastic deformation. Calculate the resulting strain? Take Young's modulus of copper as 42 × 10⁹Pa

A 200-kg load is hung on a wire with a length of 4.00 m, a cross-sectional area of 0.200 × 10⁻⁴ m², and a Young’s modulus of 8.00 × 10¹⁰N/ m². What is its increase in length?

If the elastic limit of copper is 1.5 × 10⁸ N/ m², determine the minimum diameter a copper wire can have under a load of 10.0 kg if its elastic limit is not to be exceeded.

A circular steel wire 2.00 m long must stretch no more than 0.25 cm when a tensile force of 400 N is applied to each end of the wire. What minimum diameter is required for the wire?