In ii case, work done is more. For the same current passed in both the cases compare the magnetic field induction at their centres. A child of mass 20 kg runs on the trolley from one end to the other 10 m away with a speed of 4 m s —1 relative to the trolley in a direction opposite to the its motion, and jumps out of the trolley. Two inclined frictionless tracks, one gradual and the other steep meet at A from where two stones are allowed to slide down from rest, one on each track Fig. The more pressure we put the easier it is to cut. The value for velocity is negative as the particle is directed leftward. Assume that the turntable rotates without friction.
Answer : A parallelepiped with origin O and sides a, b, and cis shown in the following figure. Every scientific discovery reveals a certain truth of nature. A body of mass 0. Q8 :A non-uniform bar of weight W is suspended at rest by two strings of negligible weight as shown in Fig. Why then does its speed increase progressively as it comes closer and closer to the earth? We will be having a glance in history like the industrial revolution of Western Europe and England which was two centuries ago. The sense of frictional torque before the start of perfect rolling is perpendicular to the plane of the disc in the outward direction.
O is the mean position of the particle. The potential energy of the system of two balls will decrease as they get closer to each other. Neglect the size of the bobs and assume the collision to be elastic. Hence, the mass of the metre stick is 66 g. These are known as Eddy currents. As height of both the planes is the same, therefore, noth the stones will reach the bottom with same speed.
The mass is then pulled sideways to a distance of 2. The potential energy of two masses in a system is inversely proportional to the distance between them. As a result, some extra water of a certain volume is displaced. The radius of the disc is R. Chemical changes, in general, are irreversible changes. The motion of the swimmer between the banks of a river is back and forth.
Its acceleration is negative as it is directed along O. This represents a unidirectional, linear uniform motion. Which of the following potential energy curves in Fig. Which of the two will start to roll earlier? State some important contemporary areas of technology and science responsible for the current revolution. Physics helps us understand the universe better. Answer: Collision is elastic, so K. It has revolutionized our lives since its discovery.
Its working depends on spring action. What is the speed of the trolley after the entire sand bag is empty? Find the following: a When a force is applied for 10 s, what is the work done? If the length of the pendulum is 1. The block is released from rest with the spring in the unstretched position. Rfand Rbare the forces exerted by the level ground on the front and back wheels respectively. Can you reverse this change? We understand nature only through the study matter, energy and their interactions. Hence, speed of satellite increases. Today more than 6000 video lectures are being watched per day on this website which is highest among any other e-learning website in India.
The fact that we can travel from India to Canada in a couple of hours, while our ancestors took months to do the same is evident that how physics has changed the way we travel. The animate and ananimate — all objects are made up of matter and energy. Let the ball be depressed by x units. An electron and a proton are detected in a cosmic ray experiment, the first with kinetic energy 10 keV, and the second with 100 keV. An electron and a proton are detected in a cosmic ray experiment, the first with kinetic energy 10 keV, and the second with 100 keV. Through the online platform, students gain access to a qualified teacher who can instantly provide solutions to the students.
If 20% of this energy can be converted to useful electrical energy, how large an area is needed to supply 8 kW? However the graph shows that the emitted electron can have any value of energy between zero and the maximum value. A person trying to lose weight dieter lifts a 10 kg mass, one thousand times, to a height of 0. There are multitude of natural phenomena taking place in this universe and all of them can be explained in terms of some basic laws. How much fat will the dieter use up? As a result, this particular pattern in the crab shell lived longer and in due course of time this pattern was genetically propagated. The chapter 6 of class 11 physics covers the following topic Section Number Topic 6. Then this change cannot be reversed.