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An electron and a positron each of mass 9.1 x 10^-31 kg, are in the same general vicinity and have very small initial speeds. They then annihilate each other, producing two photons
What is approximate energy of each emerging photon?
A wave has an angular frequency of 110 rad/s and a wavelength of 1.80 m. Calculate the angular wave number and the speed of the wave.
A 57 kg skier starts from rest at a height of H = 19 m above the end of the ski-jump ramp. As the skier leaves the ramp, his velocity makes an angle of 28° with the horizontal.
Estimate the acceleration of cyclist, and roller coaster.
A jet is circling an airport control tower at a distance of 16km. An observer in the tower watches the jet cross in front of the moon. As seen from the tower, the moon subtends an angle of 9.50x10-3 radians. Find out the distance traveled (in mete..
A surface completely surrounds a 3.5 × 10-6 C charge. Find the electric flux through this surface when the surface is (a) a sphere with a radius of 0.59 m, (b) a sphere with a radius of 0.16 m, and (c) a cube with edges that are 0.27 m long.
How much time does the ball spend in the air. What is the longest "hole in one" that the golfer can make, if the ball does not roll when it hits green.
A 120 granite cube slides down a 40 degree frictionless ramp. At the bottom, just as it exits onto a horizontal table, it collides with a 290 steel cube at rest. How high above the table should the granite cube be released to give steel cube a spe..
A train is travelling up a 4.8^circ incline at a speed of 3.25m/s while the last car breaks free and begins to coast without friction.
Eight books, each 4.9 cm thick with mass 1.2 kg, lie flat on a table. How much work is required to stack them one on top of another.
Find out the minimum values of m1 and m2 such that the overlapping of the bright fringes will occur and find position of the overlap on screen.
(a) Three point charges, A = 2.2 µC, B = 7.5 µC, and C = -3.9 µC, are located at the corners of an equilateral triangle. Find the magnitude and direction of the electric field at the position of the 2.2 µC charge.
The ball is 21.9 m from the goal post. The ball is kicked with an initial velocity of 19.8 m/s at an angle θ above ground. Between what two angles, θ1 and θ2, will the ball clear the 2.74m high crossbar.
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