![]() (a) the force on the 7 th coin (counted from the bottom) due to all the coins on its top, Ten one-rupee coins are put on top of each other on a table. (b) the magnitude of average velocity? Are the two equal? A dishonest cabman takes him along a circuitous path 23 km long and reaches the hotel in 28 min. ![]() What is the action on the floor by the man in the two cases? If the floor yields to a normal force of 700 N, which mode should the man adopt to lift the block without the floor yielding?Ī passenger arriving in a new town wishes to go from the station to a hotel located 10 km away on a straight road from the station. If the round trip takes 10 min, what is theĪ block of mass 25 kg is raised by a 50 kg man in two different ways as shown in Fig. Compare its centripetal acceleration with the acceleration due to gravity.Ī cyclist starts from the centre O of a circular park of radius 1 km, reaches the edge P of the park, then cycles along the circumference, and returns to the centre along QO as shown in Fig. What is the efficiency of the engine? How much heat is wasted per minute?Īn aircraft executes a horizontal loop of radius 1.00 km with a steady speed of 900 km/h. ![]() What is the electrical power produced?Ī steam engine delivers 5.4 x 10 8 J of work per minute and services 3.6 x 10 9 J of heat per minute from its boiler. (a) If the wind flows at a velocity v perpendicular to the circle, what is the mass of the air passing through it in time t?(b) What is the kinetic energy of the air? (c) Assume that the windmill converts 25% of the wind's energy into electrical energy, and that A = 30 m 2, v = 36 km/h and the density of air is 1.2 kg m -3. The blades of a windmill sweep out a circle of area A. Recently Viewed Questions of Class 11 Physics Determine graphically and otherwise how long the drunkard takes to fall in a pit 13 m away from the start. (d) What is the least distance between two successive crests in the wave?Ī drunkard walking in a narrow lane takes 5 steps forward and 3 steps backward, followed again by 5 steps forward and 3 steps backward, and so on. (c) What is the initial phase at the origin? (b) What are its amplitude and frequency? (a) Is this a travelling wave or a stationary wave? If it is travelling, what are the speed and direction of its propagation? The positive direction of x is from left to right. What amount of heat must be supplied to 2.0 x 10 -2 kg of nitrogen (at room temperature) to raise its temperature by 45 ☌ at constant pressure? (Molecular mass of N 2 = 28 R = 8.3 J mol -1 K -1.)Ī transverse harmonic wave on a string is described by (d) a tumbling beaker that has slipped off the edge of a table. (c) a spinning cricket ball that turns sharply on hitting the ground. (b) a monkey sitting on top of a man cycling smoothly on a circular track. ![]() (a) a railway carriage moving without jerks between two stations. Q:- In which of the following examples of motion, can the body be considered approximately a point object:.Compare the magnitude of the displacement with the total path length covered by the motorist in each case. Starting from a given turn, specify the displacement of the motorist at the third, sixth and eighth turn. On an open ground, a motorist follows a track that turns to his left by an angle of 60° after every 500 m. (e) a high-speed electron in space far from all material objects, and free of electric and magnetic fields. (d) a car moving with a constant velocity of 30 km/h on a rough road (c) a kite skillfully held stationary in the sky (b) a cork of mass 10 g floating on water (a) a drop of rain falling down with a constant speed Q:- Give the magnitude and direction of the net force acting on.What is the direction in which she should hold her umbrella? A woman rides a bicycle with a speed of 10 m s –1 in the north to south direction. Rain is falling vertically with a speed of 30 m s –1. What is the percentage error in the quantity P ? If the value of P calculated using the above relation turns out to be 3.763, to what value should you round off the result ?įill in the blanks by suitable conversion of units: The percentage errors of measurement in a, b, c and d are 1%, 3%, 4% and 2%, respectively. State the number of significant figures in the following:Ī physical quantity P is related to four observables a, b, c and d as follows :
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