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A lorry and a car moving with the same kinetic energy are brought to rest by the application of brakes which provides equal retarding forces. Which of them will come to rest in a shorter distance?
02
Oct
A lorry and a car moving with the same kinetic energy are brought to rest by the application of brakes which provides equal retarding forces. Which of them will come to rest in a shorter distance? A lorry and a car moving with the same kinetic energy are brought to rest by the application of [...]
Three identical balls are thrown from the top of a building, all with the same initial speed. As shown in Fig. 8.103, the first ball is thrown horizontally, second above horizontal level, and third at an angle
02
Oct
Three identical balls are thrown from the top of a building, all with the same initial speed. As shown in Fig. 8.103, the first ball is thrown horizontally, second above horizontal level, and third at an angle all with the same initial speed. As shown in Fig. 8.103 and third at an angle second above [...]
A rock of mass m is dropped to the ground from a height h. A second rock, with mass 2m, is dropped from the same height. When the second rock strikes the ground, what is its kinetic energy?
02
Oct
A rock of mass m is dropped to the ground from a height h. A second rock, with mass 2m, is dropped from the same height. When the second rock strikes the ground, what is its kinetic energy? A rock of mass m is dropped to the ground from a height h. A second rock [...]
A small block of mass 100 g is pressed against a horizontal spring, fixed at one end, to compress the spring through 5.0 cm (Fig. 8.102). The spring constant is 100 N/m. When released, the block moves
02
Oct
A small block of mass 100 g is pressed against a horizontal spring, fixed at one end, to compress the spring through 5.0 cm (Fig. 8.102). The spring constant is 100 N/m. When released, the block moves A small block of mass 100 g is pressed against a horizontal spring fixed at one end the [...]
An object is lifted from the ground and is placed on an elevated platform. A says that the change in potential energy of the object is 10 J. B says that the change in potential energy of the object
02
Oct
An object is lifted from the ground and is placed on an elevated platform. A says that the change in potential energy of the object is 10 J. B says that the change in potential energy of the object An object is lifted from the ground and is placed on an elevated platform. A says [...]
Consider the two cases: a. A says that the potential energy of a book place on a shelf is 10 J. b. B says that the potential energy of the same book is – 10 J. Which one of them is wrong? Justify.
02
Oct
Consider the two cases: a. A says that the potential energy of a book place on a shelf is 10 J. b. B says that the potential energy of the same book is – 10 J. Which one of them is wrong? Justify. Consider the two cases: a. A says that the potential energy of [...]
An elevator is moving up with a constant velocity. Two different masses are attached to two different springs of same spring constant. Say you do two operations expanding the spring or
02
Oct
An elevator is moving up with a constant velocity. Two different masses are attached to two different springs of same spring constant. Say you do two operations expanding the spring or An elevator is moving up with a constant velocity. Two different masses are attached to two different springs of same spring constant. Say you [...]
A boy throws a ball with initial velocity u at an angle of projection theta from a tower of height H. Neglecting the air resistance , find a. How high above the building the ball rises
02
Oct
A boy throws a ball with initial velocity u at an angle of projection theta from a tower of height H. Neglecting the air resistance , find a. How high above the building the ball rises A boy throws a ball with initial velocity u at an angle of projection theta from a tower of [...]
Fig. 8.100 shows a light, inextensible string attached to a cart, which can slide along a frictionless horizontal rail aligned along the x axis. The left end of the string is pulled over a pulley of negligible
02
Oct
Fig. 8.100 shows a light, inextensible string attached to a cart, which can slide along a frictionless horizontal rail aligned along the x axis. The left end of the string is pulled over a pulley of negligible Fig. 8.100 shows a light inextensible string attached to a cart which can slide along a frictionless horizontal [...]
A uniform board of length L is sliding along a smooth (frictionless) horizontal plane as in Fig. 8.89. The board then slides across the boundary with a rough horizontal surface. The coefficient of kinetic
02
Oct
A uniform board of length L is sliding along a smooth (frictionless) horizontal plane as in Fig. 8.89. The board then slides across the boundary with a rough horizontal surface. The coefficient of kinetic A ball of mass m is thrown in air with speed v1 from a height h1 and it is at a [...]