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Which of the following observations support the statement that “Every system tends to adjust by itself to have minimum Potential Energy”.(a) Andromeda galaxy and Milky Way galaxy are approaching each other.(b) Two unlike, free charges move towards each other.(c) External work is required to compress a spring.(d) A powerful magnet can deflect a compass needle from equilibrium position.
A fisherman notices that his boat is moving up and down periodically without any horizontal motion, owing to waves on the surface of the water. How fast are the waves traveling
An airplane is flying with the velocity of 85.0 m/s at an angle of 20.0 degrees above the horizontal. When the plane is a distance 107 m directly above the dog that is standing on level ground, a suitcase drops out of the luggage compartment. How far..
Two concentric metallic spheres of radii r1 and r2> r1, respectively, are maintained at temperatures T1 and T2, and are separated by a layer of homogeneous material thermal conductivity k.
The resistance of a very fine aluminum wire with a 17?m x 17?m square cross section is 1200 ? . A 1200 ? resistor is made by wrapping this wire in a spiral around a 3.9-mm-diameter glass core
A conveyor belt is used to move sand from one place to another in a factory. The conveyor is tilted at an angle of 13.3° from the horizontal and the sand is moved without slipping at the rate of 6.51 m/s. The sand is collected in a big drum 2.89 m be..
A small space telescope at the end of a teather line of length "L" moves at liner speed "v" about a central space station, what will be the linear speed of the telescope if the length of the line is reduced to 0.33L
A uniform rod of mass 3.05×10?2kg and length 0.410mrotates in a horizontal plane about a fixed axis through its center and perpendicular to the rod. What is the angular speed of the rod after the rings leave it
Two identical conducting spheres, fixed in place, attract each other with an electrostatic force of -1.0799 N when separated by 50 cm, center-to-center. What were the initial charges on the spheres
A man clearly see an object that is 2m away(or more) without glasses. if the glasses have a refractive power of +1.50D, how close can an object be to the eyeglasses
A rock is dropped off a 200m cliff. What is the velocity of the rock at a height of 30m?( we are currently studying the conservation of energy)
A proton accelerates from rest in a uniform electric field of 652 N/C. At some later time, its speed is 1.26 106 m/s. How far has it moved in that interval
A 92-keV x-ray is Compton-scattered through an angle of 10o. What is the energy of the x-ray after scattering
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