NCERT Exemplar Class 11
A ball is thrown from a roof top at an angle of 45° above the horizontal. It hits the ground a few seconds later. At what point during its motion, does the ball have . (a) greatest speed (b) smallest speed (c) greatest acceleration Explain.
31
Oct
A ball is thrown from a roof top at an angle of 45° above the horizontal. It hits the ground a few seconds later. At what point during its motion, does the ball have . (a) greatest speed (b) smallest speed (c) greatest acceleration Explain. A ball is thrown from a roof top at an [...]
A cyclist starts from centre O of a circular park of radius 1 km and moves along the path OPRQO as shown in figure. If he maintains constant speed of 10 ms^−1, what is his acceleration at point R in the magnitude and direction ?
31
Oct
A cyclist starts from centre O of a circular park of radius 1 km and moves along the path OPRQO as shown in figure. If he maintains constant speed of 10 ms^−1, what is his acceleration at point R in the magnitude and direction ? A cyclist starts from centre O of a circular park [...]
Following are four different relations about displacement, velocity and acceleration for the motion of a particle in general. Choose the incorrect one (s).
31
Oct
Following are four different relations about displacement, velocity and acceleration for the motion of a particle in general. Choose the incorrect one (s). Following are four different relations about displacement velocity and acceleration for the motion of a particle in general. Choose the incorrect one (s). October 31, 2020 Category: Chapter 3 - Motion in [...]
A particle slides down a frictionless parabolic (y=x^2) track (A−B−C) starting from rest at point A. Point B is at the vertex of parabola and point C is at a height less than that of point A. After C, the particle moves freely in air as a projectile. If the particle reaches highest point at P, then
31
Oct
A particle slides down a frictionless parabolic (y=x^2) track (A−B−C) starting from rest at point A. Point B is at the vertex of parabola and point C is at a height less than that of point A. After C, the particle moves freely in air as a projectile. If the particle reaches highest point at [...]
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A particle slides down a frictionless parabolic (y=x^2) track (A−B−C) starting from rest at point A. Point B is at the vertex of parabola and point C is at a height less than that of point A. After C ,
the particle moves freely in air as a projectile. If the particle reaches highest point at P ,
then ,
The range of a projectile fired at an angle of 15^∘ is 50 m. If it is fired with the same speed at an angle of 45T∘ its range will be
31
Oct
The range of a projectile fired at an angle of 15^∘ is 50 m. If it is fired with the same speed at an angle of 45T∘ its range will be The range of a projectile fired at an angle of 15^∘ is 50 m. If it is fired with the same speed at an [...]
The velocity- displacement graph of a particle is shown in figure. (a) Write the relation between v and x. (b) Obtain the relation between acceleration and displacement and plot it.
31
Oct
The velocity- displacement graph of a particle is shown in figure. (a) Write the relation between v and x. (b) Obtain the relation between acceleration and displacement and plot it. The velocity- displacement graph of a particle is shown in figure. (a) Write the relation between v and x. (b) Obtain the relation between acceleration [...]
A ball is dropped from a building of height 45m. Simultaneously another ball is thrown up with a speed 40m/s. Calculate the relative speed of the balls as a function of time.
31
Oct
A ball is dropped from a building of height 45m. Simultaneously another ball is thrown up with a speed 40m/s. Calculate the relative speed of the balls as a function of time. A ball is dropped from a building of height 45m. Simultaneously another ball is thrown up with a speed 40m/s. Calculate the relative [...]
A man runs across the roof of a tall building and jumps horizontally on to the (lower) roof of an adjacent building. If his speed is 9 m s⁻¹ and the horizontal distance between the building is 10 m and the height difference between the roofs is 9 m. Will he be able to land on the next building? (Take g = 10 m s⁻²).
31
Oct
A man runs across the roof of a tall building and jumps horizontally on to the (lower) roof of an adjacent building. If his speed is 9 m s⁻¹ and the horizontal distance between the building is 10 m and the height difference between the roofs is 9 m. Will he be able to land [...]
A bird is tossing (flying to and fro) between two cars moving towards each other on a straight road. One car has speed of 27 km h^−1 while the other has the speed of 18 km h^−1. The bird starts moving from first car towards the other and is moving with the speed of 36 km h^−1 when the two were separated by 36 km. The total distance covered by the bird is
30
Oct
A bird is tossing (flying to and fro) between two cars moving towards each other on a straight road. One car has speed of 27 km h^−1 while the other has the speed of 18 km h^−1. The bird starts moving from first car towards the other and is moving with the speed of 36 [...]
A particle executes the motion described by x(t) = x₀(1-(e^-γt)) t≥0, x₀>0. (a) Where does the particle start and with what velocity? (b) Find maximum and minimum values of x(t), v(t) and a(t). Show that x(t) and a(t) increase with time and v(t) decreases with time.
30
Oct
A particle executes the motion described by x(t) = x₀(1-(e^-γt)) t≥0, x₀>0. (a) Where does the particle start and with what velocity? (b) Find maximum and minimum values of x(t), v(t) and a(t). Show that x(t) and a(t) increase with time and v(t) decreases with time. A particle executes the motion described by x(t) = [...]