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AC train starting from railway station and moving with uniform acceleration attained a speed 40 km per hour in 10 minutes find its acceleration?

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Starting from rest a body slides down a 45° inclined plane in twice the time it takes to slide down the same distance in the absence of friction. The coefficient of friction between the body and the inclined plane is : Correct answer is '0.75'. Can you explain this answer?

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The rear side of a truck is open and a box of 40kgmass is placed 5maway from the open and as shown. The coefficient of friction between the box and the surface below it is 0.15. On a straight road, the truck starts from rest and accelerates with 2ms–2. At what distance (inm.) from the starting point does the box fall off the truck (i.e. distance traveled by the truck)? [Ignore the size of the box] Correct answer is '20'. Can you explain this answer?

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A toy rocket of mass 0.1 kg has a small fuel of mass 0.02kg which it burns out in 3s. Starting from rest on a horizontal smooth track, it gets a speed of 20 ms-1after the fuel is burnt out. What is the approximate thrust of the rocket? What is the energy (joules/kg) content per unit mass of the fuel? (Ignore the small mass variation of the rocket during fuel burning) Correct answer is '1000'. Can you explain this answer?

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Rockets are propelled by the momentum reaction of the exhaust gases expelled from the tail. Since these gases arise from the reaction of the fuels carried in the rocket, the mass of the rocket is not constant, but decreases as the fuel is expended. Show that the equation of motion for a rocket projected vertically upward in a uniform gravitational field, neglecting atmospheric friction, is m dv/dt = −v' dm/dt − mg,where m is the mass of the rocket and v is the velocity of the escaping gases relative tothe rocket. Integrate this equation to obtain v as a function of m, assuming a constant time rate of loss of mass. Show, for a rocket starting initially from rest, with v equal to 2.1 km/s and a massloss per second equal to 1/60th of the initial mass, that inorder to reach the escape velocity the ratio of the weight of the fuel to the weight of the empty rocket must be almost 300!?

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A train starting from a railway? for Physics 2024 is part of Physics preparation. The Question and answers have been prepared according to the Physics exam syllabus. Information about A train starting from a railway? covers all topics & solutions for Physics 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A train starting from a railway?.

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