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the sum of two unit vector is also a unit vector.then magnitude of their different is..
1) 0. 2) root 2. 3) root 3. 4) root 7
In Progress...
a boy and his father run together.mass of the boy is half of his father ; kinetic energy of father is half of his son.if the father increases his velocity 1 m/s , then the kinetic energy becomes equal of each . what is their initial velocity?
if they run with their own kinetic energy on a road which is inclined and the road makes an angle of 30 degree with horizontal, how much distance will each of them complete ?
In Progress...
Initially a mass m is held such that spring is in relax conditions.if mass is suddenly released, maximum elongation in spring will be..
1) mg/k. 2) 2mg/k. 3) mg/2k. 4) mg/4k
In Progress...
why we feel comfortable after running the air conditioner? explain with the theory of humidity of air in physics
In Progress...
1. A uniform electric field of 200 N/C is in the x-direction. A point charge of 3μC is released from rest at the origin. What is the kinetic energy of the charge when it is at x = 4 m?


a. 2.4×10 −2 J



b. 1.6×10 −2 J



c. 3.6×10 −2 J



d. 4.8×10−2J

2, Two large horizontal metal plates are separated by 4 mm. The lower plate is at a potential of
−6V
. What potential should be applied to the upper plate to create electric field strength of 4000 V/m upwards in the space between the plates?


a. +22V



b. +10V



c. −10V



−22V


3. An ac circuit consists of a voltage source v=200sin120πt and a 6μF capacitor in series. Calculate the current established in the circuit


a. 0.32A

b. 1.24A

c. 0.64A

d. 2.13A

4. Gauss’s law says that the net flux passing through a Gaussian sphere is equal to the charge enclosed divided by?

a.1
b. 1/ε 0
c. 0
d. ε 0






In Progress...
what are dark matters and dark energy?
In Progress...
How is energy convertable in matter?Please site examples.
In Progress...
What is the pathway of origin of matter in universe?What are bosons and kindly tell the significance of Higg's boson.
In Progress...
A massless rope is stretched horizontally between two supports that are 3.0 m apart.
When an object of weight 3200 N is hung at the center of the rope, the rope is observed
to sag by 50 cm. Calculate the tension in the rope.
In Progress...
A He-Ne laser emits a beam of diameter 2×10−3m and wavelength 630 nm. It is directed
towards an aeroplane flying at a height of 11 km. Calculate the diameter of the light patch
produced on the surface of the aeroplane
In Progress...
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