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Q. 9. Three identical spheres A, BandC each of radius R, are placed touching one another on a horizontal table. Where is the centre of mass of the system located relative to A (say)?
Q. Two metallic sphere of mass M are suspended by two strings each of length L. The dis†an ce between the upper ends of strings is L. The angle which the strings will make with the vertical due to mutual attraction sphere is (if each mass horizontally moved by a dis†an ce of L/4 due to mutual attraction)
Q. 11. Two metailic sphere of mass M are suspended by two strings each of length L. The distance betw upper ends of strings is L. The angle which the strings will make with the vertical due to mutual a ttraction sphere is (if each mass horizontally moved by a distance of due to mutual attraction) -11 GM gL , GM 2gL (2) tan GM 4GM (4) tan gl2
Q. A mass M is suspended by a weightless string. The horizontal force that is required to displace it until the string makes an angle of 45^° with the initial vertical direction is
Q.
A block of 5 kg mass rests on a horizontal floor. The action of the block on the floor is
50 N vertically upward
50 N vertically downward
5 N vertically upward
5 N vertically downward
Q. { Two blocks of masses }m each are hung from a balance as shown in the }}{ figure. The scale pan }A is at height }H_1 whereas scale pan }B is at height be }}{ Ha. Net torque of weights acting on the system about point }C , will be }}{ (length of the rod is }\ell and }H_1&H_2 are }<H_2)
Q. . Two balls each of mass m are hung side by sideby two long threads of equal length l. If the distance between the upper ends of threads is r (r <
View SolutionQ. 17.A cart of mass 150 kg is pulled horizontally on a frictionless surface with force 10 N. If 100 g/s sand is being dr opped in the cart vertically then find the speed of the system when cart has 100 kg sand in it. (1) 10 m/s (2) 20 m/s (3 ) 40 m/s (4) 50 m/s
Q. a uniform rod of length 12 m and mass 36 kg is kept horizontally on two holders.at which position a mass of 54 kg have to kept so that force applied on a holder is double of another holder?
Q. A small metallic sphere of mass m is suspended from the ceiling of a car accelerating on a horizontal road with constant acceleration a. What will be the tension in the string attached with metallic sphere?
Q. When a fat person tries to touch his toes, keeping the legs straight, he generally falls. Explain with reference to figure (10-Q2).
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Figure