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A body of mass 2 kg thrown vertically upwards with a velocity 40 m/s comes to instantaneous rest at a height 50 m. Is there any other force (other than gravitational force), if yes then calculate the value. Ans) Yes , a force due to air drag will be there , to calculate this wehave to first find work done by air drag..Acc. To work-energy theoremWgravity + Wair drag = change in K.E.-Mgh +Wair drag = change in K.E.Wair drag =change in K.E. +mgh=[0-1/2mu2] +mgh = -1/2 x 2 x (40)2 + 2x 10 x 50 = -1600+1000 = -600Jnow w.d. = F x sF= -600/50 = -12N
Demerits of Vacuum Diode over Semiconductor Diode (i) Bigger in size (ii) Less efficiency (iii) Expensive
It is desired to lessen the reflection of light by the outer surfaces of the objective lenses of a pair of binoculars. These surfaces are the foremost surfaces that light hits on e
Explain electric lawn-mower A television set having a power rating of 120W and electric lawn-mower of power rating 1 kW are both linked to a 240V supply. If 3A, 5A and 10A
what is meant by small signal amplifiers
Two positive lens L 1 and L 2 has the same focal length f>0. The distance between them is f/2. L 1 is placed to the left of L 2 . (a) An object is placed to the left of L1 wi
The elctric field in a certain region of space has components E x = 6.0 N/C, E y = 7.0 N/C, and E z = 0. Find the electric flux though the surface x = 6 y , 0 x
1. A very narrow laser beam is shone into a sphere of solid glass that has uniform refractive index n>1 and radius ρ . The beam makes an angle α in air with the normal to the surf
Sound waves are being used to determine the depth of a freshwater lake, as shown in the figure below. If the water is 25°C and it takes 1.2 s for the echo to return to the sens
a mild steel wire of length 1mand cross sectional area 0./10^2 cm^2 is stretched. within the elastic limit horizontally between two pillars. a mass of 100g is suspended from the mi
Germanium possesses (A) One valence electrons. (B) Two valence electrons. (C) Three valence electrons. (D) Four valence electrons. Ans: Germanium possess
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