Three light rods from a right angled triangle. The tension in the rod PR, if a force of `300N` is applied vertically downward at `R` is.

Two light vertical springs with equal natural length and spring constants k_(1) and k_(2) are separated by a distance l . Their upper end the ends A and B of a light horizontal rod AB . A vertical downwards force F is applied at point C on the rod. AB will remain horizontal in equilibrium if the distance AC is

A person wishes to fit three rods together in the shape of a right angled triangle so that the hypotenuse is to be longer 4cm than the base and 8cm longer than the altitude.The lengths of the rods are

PQR is a right angled triangle made of brass rod bent as shown. If it is heated to a high temperature the angle PQR .

PQR is a right angled triangle made of brass rod bent as shown. If it is heated to a high temperature the angle PQR.

A light string of 70cm has its two ends tied at the same level 50cm apart. A force of 100N is applied at a distance of 30cm from P . The tension in part PR is.

A 2kg block is in contact with a vertical wall having coefficient of friction 0.5 between the surfaces. A horizontal force of 40N is applied on the block at right angles to the wall. Another force of 15N is applied on the plane of the wall and at right angles to 40N force. Find the acclecration of the block .

Three rods of iron form an isosceles triangle. What will be the change in the base angles of that triangle due to a rise in its temperature?

A steel rod of length l_(1) = 30 cm and two identical brass rod of length l_(2)= 20 cm each support a light horizontal platform as shown in Fig. Cross-sectional area of each of the three rods is A = 1 cm^(2) . A vertically downward force F= 5000 N is applied on the platform. Young's modulus of elasticity for steel Y_(s)=2xx10^(11)Nm^(-2) and brass Y_(b) = 1 xx 10^(11) Nm^(-2) . Find stress (in MPa ) developed in a. Steel rod b. Brass rod