NCERT Exemplar Class 11
A woman throws an object of mass 500 g with a speed of 25 m/s. (i) What is the impulse imparted to the object? (ii) If the object hits a wall and rebounds with half the original speed, what is the change in momentum of the object?
09
Nov
A woman throws an object of mass 500 g with a speed of 25 m/s. (i) What is the impulse imparted to the object? (ii) If the object hits a wall and rebounds with half the original speed, what is the change in momentum of the object? A woman throws an object of mass 500 [...]
In a figure a body A of mass m slides on plane inclined at angle θ1 to the horizontal and μ is the coefficient of friction between A and the plane. A is connected by a light string passing over a frictionless pulley to another body B, also of mass m, sliding on a frictionless plane inclined at an angle θ2 to the horizontal. Which of the following statements are true?
09
Nov
In a figure a body A of mass m slides on plane inclined at angle θ1 to the horizontal and μ is the coefficient of friction between A and the plane. A is connected by a light string passing over a frictionless pulley to another body B, also of mass m, sliding on a frictionless [...]
Mass m1 moves on a slope making an angle θ with the horizontal and is attached to mass m2 by a string passing over a frictionless pulley as shown in Fig. 5.2. The co-efficient of friction between m1 and the sloping surface is μ.Which of the following statements are true?
09
Nov
Mass m1 moves on a slope making an angle θ with the horizontal and is attached to mass m2 by a string passing over a frictionless pulley as shown in Fig. 5.2. The co-efficient of friction between m1 and the sloping surface is μ.Which of the following statements are true? A cricket ball of mass [...]
In the figure the coefficient of friction between the floor and the body B is 0.1. The coefficient of friction between the bodies B and A is 0.2. A force F is applied as shown on B. The mass of A is m/2 and B is m. Which of the following statements are true?
09
Nov
In the figure the coefficient of friction between the floor and the body B is 0.1. The coefficient of friction between the bodies B and A is 0.2. A force F is applied as shown on B. The mass of A is m/2 and B is m. Which of the following statements are true? A [...]
The motion of a particle of mass m is given by x=0 for t
09
Nov
The motion of a particle of mass m is given by x=0 for t The motion of a particle of mass m is given by x=0 for t November 9, 2020 Category: Chapter 4 - Laws of Motion , NCERT Exemplar Class 11 , Physics ,
A cricket ball of mass 150 g has an initial velocity (3iˆ+ 4jˆ)ms^−1 and a final velocity v =−(3iˆ+4jˆ)ms^−1 after being hit. The change in momentum (final momentum initial momentum) is (in kg ms^−1)
31
Oct
A cricket ball of mass 150 g has an initial velocity (3iˆ+ 4jˆ)ms^−1 and a final velocity v =−(3iˆ+4jˆ)ms^−1 after being hit. The change in momentum (final momentum initial momentum) is (in kg ms^−1) A cricket ball of mass 150 g has an initial velocity (3iˆ+ 4jˆ)ms^−1 and a final velocity v =−(3iˆ+4jˆ)ms^−1 after being [...]
Two particles are projected in air with speed v0 at angles θ1 and θ2 (both acute) to the horizontal, respectively. If the height reached by the first particle is greater than of the second, then tick the right choices.
31
Oct
Two particles are projected in air with speed v0 at angles θ1 and θ2 (both acute) to the horizontal, respectively. If the height reached by the first particle is greater than of the second, then tick the right choices. respectively. If the height reached by the first particle is greater than of the second then [...]
(b) Earth also moves in circular orbit around the sun once every year with an orbital radius of 1.5 x 10^11 m. What is the acceleration of the earth (or any object on the surface of the earth) towards the centre of the sun? How does this acceleration compare with g = 9.8 m/s^2 ?
31
Oct
(b) Earth also moves in circular orbit around the sun once every year with an orbital radius of 1.5 x 10^11 m. What is the acceleration of the earth (or any object on the surface of the earth) towards the centre of the sun? How does this acceleration compare with g = 9.8 m/s^2 ? [...]
(a) Earth can be thought of as a sphere of radius 6400 km. Any object (or a person) is performing circular motion around the axis of the earth due to the earth rotation (period 1 day). What is the acceleration of object on the surface of the earth (at equator) towards its centre? What is it at latitude theta ? How does these accelerations compare with g = 9.8 m/s^2?
31
Oct
(a) Earth can be thought of as a sphere of radius 6400 km. Any object (or a person) is performing circular motion around the axis of the earth due to the earth rotation (period 1 day). What is the acceleration of object on the surface of the earth (at equator) towards its centre? What is [...]
A fighter plane is flying horizontally at an altitude of 1.5 km with speed 720 km/h. At what angle of sight (w.r.t. horizontal) when the target is seen, should the pilot drop the bomb in order to attack the target than?
31
Oct
A fighter plane is flying horizontally at an altitude of 1.5 km with speed 720 km/h. At what angle of sight (w.r.t. horizontal) when the target is seen, should the pilot drop the bomb in order to attack the target than? A fighter plane is flying horizontally at an altitude of 1.5 km with speed [...]