Killer Beetle that spray acid from its back! - By Kishor Singh #shorts

A ball falls undal gravity from a height of 10m with an initial downward velocity u. It collides with ground, loses halft its energy and then rises back to the same height. Find the initial velocity u.

In a Citrus plantation, all the plants were found to be suffering from the die-back, spraying of fungicides was of no help. This problem was due to the deficiency of

A gas is initinaly at a pressure of 100 kPa and its volume is 2.0 m^(3) . Its pressure is kept constant and the volume is changed from 2.0 m^(3) to 2.5^(3) . Its volume is now kept constant and the pressure is increased from 100 lPa to 200 kPa. The gas is brought back to its initial state, the pressure varying linearly with its volume. (a) whether the heat is supplied to or exterted from the gas in the complete cycle ? (b) how much heat was supplied or extracted ?

n small drops of same size are charged to V volts each .If they coalesce to from a singh larg drop, then its potential will be -

Comprehension # 9 In James bond movie ''The Spy Who Loved Me'', James skied down a snowy slope in an attempt to escape from the killer. Unfortunately, the killer had a higher skiing speed than James's, they are 40m//s and 40m//s respectively. Now consider an alternative version of the movie. James noted that he and the killer carried the same kind of rifle' and estimated that their masses M (including body mass, skis, weapon, backpack, ect) were about the same. Recalling high school physics knowledge, James realised that each time he fired his weapon back at the killer, his momentum would change, whereas when the killer fired, the killer's momentum would also change. Evergy time James fired a bullet, the killer would fire back accordingly. Assume that all bullets missed their targets (otherwise this exercise would terminte). Given M = 100 kg , mass and the muzzle velocity of a bullet are m = 0.02 kg and v = 500 m//s respectively How many bullets James had to fire in order to assure that the killer couldn't catch up with him ?

When an object is thrown inair, does it travel agreater horizontal distance while climbing to its maximum height or while descending from its maximum height back to the ground ? Or is the horizontal distance travelled the same for both ?

A rubber ball is thrown from a height of 10m. It bounces back to 90% of its previous height after every bounce.Find its height after two bounces?

You throw a baseball straight upward. If air resistance is not neglected, how does the time required for the ball to.go, from the height at which it was thrown up to its maximum height compare to the time required for it to fall from its maximum height back down to the height from which it was thrown ? Explain your answer.