Two strips of metal are riveted together at their ends by four rivets, each of diameter 6.0 mm. What is the maximum tension that can be exerted by the riveted strip if the shearing stress on the rivet is not to exceed `6.9xx10^(7)` Pa ?

Two narrow bores of diameters 3.00mm and 6.0mm are joined together to form a U-tube open at both ends. If the U-tube contains water, what is the difference in its levels in the two limbs of the tube? Surface tension of water at the temperature of the experiment is 7.3 times 10^-2 N m^-1 .Take the angle of contact to be zero and density to water to be 1.0 times 10^3 kg m^-3

a. Two insulated charged copper spheres A and B have their centres separated by a distance o 0.5 m. What is the mutual force of electrostatic repulsion if the charge on each is 6.5xx10^(-7)C ? Assume that the radii of A and B are negligible compared to the distance fof separation. b. What is the fore of repulsion if each sphere is charged double the above amount and the distance between them is halved?

The lower end of a capillary tube of diameter 2.00mm is dipped 8.00cm below the surface of water in a beaker. What is the pressure required in the tube in order to blow a hemispherical bubble at its end in water? The surface tension of water at temperature of the experiments is 7.30 times 10^2 Nm^-1 .1 atmospheric pressure =1.01 times 10^5 Pa density of water =1000 kg//m^3,g=9.80 ms^-2 . Also calculate the excess pressure.

A brass wire 1.8 m long at 27 ^(@) C is held taut with little tension between two rigid supports. If the wire is cooled to a temperature of - 39 ^(@) C . what is the tension developed in the wire, if its diameter is 2.0 mm ? Co-efficient of tear expansion of brass = 2.0 xx 10^(-5) K^(-1) , Young's modulus of brass = 0.91 xx 10^(11) Pa.

A brass wire 1.8 m long at 27^(@)C is held taut with a little tension b/w two rigid supports. If the wire is cooled to a temperature of -39^(@)C , what is the tension developed in the wire, if its diameter is 2.0 mm ? a=2.0xx10^(-5)""^(@)C^(-1)andY=0.91xx10^(11)Pa ?

Two insulated charged copper spheres A and B have their centres separated by a distance of 0.5 m. The charge on each spheres is 6.5xx10^(-7)C . A third sphere c of identifical shape and size is brought in contanct with A and them brought in contact with B and finally removed. What is the new force between A and B?

A square lead slab of side 50 cm and thickness 10 cm is subject to a shearing force (on its narrow face) of 9.0xx10^(4)N . The lower edge is riveted to the floor How much will the upper edge be displaced ?

Light of frequency 7.21 xx 10^(14) Hz is incident on a metal surface. Electrons with a maximum speed of 6.0 xx 10^(5)m//s are ejected from the surface. What is the threshold frequency for photoemission of electrons?

If two spheres of equal masses with centres 0.2 m part attract each other with a force of 1xx10^(-6) kg wt . What would be the value of their masses? g=9.8ms^(-2)" and "G=6.67xx10^(-11)Nm^(2)kg^(-2)