W = 200 J
h = 2m
W = mgh = `m xx 10 xx 2`
??

If 4003250 = 4 xx 10^(x) + 3 xx 10^(7) + 2 xx 10^(z) + 5 xx 10^(w) , then x + y + z + w is equal to

Calculate the saturation thermionic current if 120 W is applied to a thoriated-tungsten filament of surface area 1.0 cm^2 . Assume that the surface radiates like a blackbody. The required constants are A = 3 xx10^4 A m^(-2) -K^2 , varphi = 2.6 eV, k = 8.62 xx 10^(-5) eV kK^(-1) and sigma = 6 xx 10^(-8) W m^(-2) K^(-4)

Four companies submitted the quotations for building a bridge, with the following values of breaking stress (B_(s)) and working stress (W_(s)) expressed in N//m^(2) (A) B_(s) = 25 xx 10^(8), W_(s) = 15 xx 10^(8) (B) B_(s) = 20 xx 10^(8), W_(s) = 15 xx 10^(8) (C ) B_(s) = 25 xx 10^(8), W_(s) = 12.5 xx 10^(8) (D) B_(s) = 25 xx 10^(8), W_(s) = 20 xx 10^(8) To whome the contract should be given, if all of them have quoted the same amount ?

For Question, find the total energy of osciallation if mass of the body is 100g Hint : m = 100 xx 10^(-3) kg Energy = (1)/(2) mA^(2) omega^(2)

A heating coil is rated 100 W , 200 V . The coil is cut in half and two pieces are joined in parallel to the same source . Now what is the energy ( "in" xx 10^(2) J) liberated per second?

How many photons are emitted by a laser source of 5 xx 10^(-3) W operating at 632.2 nm in 2 second (h = 6.63 xx 10^(-34)Js) ?

Calculate the energy radiated per second from the filament of an incandescent lamp at 2000K, if the surface area is 5.0 xx 10^(-5) m^(-2) and its relative emittance is 0.85 & sigma = 5.7 xx 10^(-8) W m^(-2) K^(-4)

When a 40 Vm^(-1) electric field produced inside a conductor then 2 xx 10^(4) Am^(-2) curren density is established in it. Resistivity of the conducot is (1) 2 xx 10^(-3) Omega m (2) 4 xx 10^(-3) Omega m (3) 2 xx 10^(3)Omega m (4) 4 xx 10^(3) Omega m ]\