onda

find the power of an engine in kilowatts which pulls a train of mass 600 tonnes up an incline of 1 in 100 at the rate of 60 km per hour. the weight of the engine is 200 tonnes and the resistance due to friction is 50 newton per tonne

a piece of gold aluminuim alloy weighs 100g in air and 80g in water.what is the weight of the gold in the alloy if the relative density of gold is 19.3 and that of aluminium is 2.5

a coin placed on a disc rotates with speed of 33 1/3 rev. per minute provided that the coin is no more than 10 cm from the axis calculate the coefficient of static friction between the coin and the disc

a mass of gas emitted from the rear of toy rocket is initially 0.2kg/s. if the speed of the gas relative to the rocket is 40m/s and the mass of the rocket is 4 kg what is the initial acceleration of the rocket

a particle of mass 0.3kg vibrates with a period of 2 sec. if its amplitude is 0.5m what is its maximum kinetic energy