Created by StemPy LabImagine a straight, smooth tunnel dug through the Earth along a chord, as shown in the figure. The chord is at a distance from the centre of the Earth, where is the radius of the Earth. Treat the Earth as a uniform sphere, and let be the acceleration due to gravity at its surface. A small ball is released from rest at one end of the tunnel. Its speed as it passes the midpoint of the tunnel is
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← A uniform solid cylinder of mass 3 kg lies on a rough horizontal floor. A horizontal force of 12 N is applied to it, perpendicular to its axis, at the topmost point of the cylinder. The cylinder rolls without slipping. Which statement about the acceleration of its centre and the friction force from the floor is correct?A U-tube of uniform cross-section stands vertically and contains some mercury, of relative density 13.6. Water is poured slowly into the left arm until the column of water above the mercury in that arm is 27.2 cm tall, as shown in the figure. The water and mercury do not mix. How far above the mercury surface in the right arm is the top of the water in the left arm? →
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