Questions asked
Ravindra Samadiya
Numerade educator
A U-shaped wire is dipped in a soap solution, and removed. A thin soap film formed between the wire and a light slider supports a weight of 1.5×10-2N (which includes the small weigh of the slider). The length of the slider is 30cm. What is the surface tension of the film?
A truck is collide with a car. If mass and velocity of the truck and car 2500kg , 15m/s and 1000kg moving with at 5m/s respectively in the opposite direction. What is their common velocity?
A T.V. set having a power of 120 W and electric lawnmower of power rating 1 kW are both connected to a 240 V supply. If 3 A, 5 A and 10 A fuses are available state which is the most appropriate for each appliance.
A system consists of three particles, each of mass m and located at (l, 1), (2, 2) and (3, 3). The co- ordinates of the centre of mass are
A student uses a lens of focal length 50 cm and –50 cm respectively . Find its nature and power used by each of them?
"A stone tied to the end of a string of 1 m long is whirled in a horizontal circle with a constant speed. If the stone makes 22 revolutions in 44 seconds, what is the magnitude and direction of acceleration of the stone?"
A person wearing a lens of power −5.5 D for correcting his distant vision. For correcting his near vision he wearing a lens of power +1.5 dioptre. What is the focal length of the lens required for correcting (i) distant vision, and (ii) near vision?
A rifle of mass 4 kg is fired a bullet of mass 50 g with an initial velocity of 35 m s−1. Calculate the initial recoil velocity of the rifle.
A roller coaster is designed such that riders experience “weightlessness” as they go round the top of a hill whose radius of curvature is 20 m. The speed of the car at the top of the hill is between
A small air bubble of radius 0.1 mm is situated at a depth of 10 m below the free surface of water .The external pressure on the bubble will be -