Multiple Choice Questions| Chapter 3 | Translatory Motion| Physics 11th | National Book Foundation скачать в хорошем качестве

Multiple Choice Questions| Chapter 3 | Translatory Motion| Physics 11th | National Book Foundation

Q. Encircle the correct option. A projectile thrown upward moves in its parabolic path, the velocity and acceleration vectors for the projectile are perpendicular to each other at: (a) no where (b) the highest point (c) the launch point (d) the landing point A truck driving along a highway road has a large quantity of momentum. If it moves at the same speed but has twice as much mass, its momentum is (a) zero (b) quadrupled (c) doubled (d) unchanged A 5N force is applied to a 3kg ball to change its velocity from 9m/s to 3m/s. This impulse causes the momentum change of the ball to be ________ kgm/s (a) -2.5 (b) -10 (c) -18 (d) -45 Which of the following statement is not true for the horizontal motion of projectiles? (a) A projectile with a horizontal component of motion will have a constant horizontal velocity (b) The horizontal velocity of a projectile is 0m/s at the peak of its trajectory (c) The horizontal velocity of a projectile is unaffected by the vertical velocity; these two components of motion are independent of each other. (d) The horizontal displacement of a projectile is dependent upon the time of flight and the initial horizontal velocity. The vertical component of velocity of a projectile is smallest at: (a) the instant it is thrown (b) halfway to the top (c) the top (d) the landing point A 4kg object has a momentum of 12kgm/s. The object’s speed is _____ m/s. (a) 3 (b) 4 (c) 12 (d) 48 A bomb of mass 9kg explodes into 2 pieces of mass 3kg and 6kg. The velocity of mass 3kg is 1.6m/s, the kinetic energy of mass 6kg is: (a) 3.84J (b) 9.6J (c) 1.92J (d) 2.92J Which of the following statement is true about the projectile motion? (a) projectile motion is the motion of an object projected vertically upward into the air and moving under the influence of gravity (b) projectile motion is the motion of an object projected into the air and moving independently of gravity. (c) projectile motion is the motion of an object projected into the air and moving under the influence of gravity. (d) projectile motion is the motion of an object projected horizontally into the air and moving independently of gravity. What is the force experienced by a projectile after the initial force that launched it into the air in the absence of air resistance? (a) The gravitational force (b) The nuclear force (c) The contact force (d) The electromagnetic force If a projectile is launched on level ground, what launch angle maximizes the range of the projectile? (a) 0° (b) 30° (c) 45° (d) 90° What are the conditions for using the equations of motion? If the magnitude of cross product between two vectors is √3 times the dot product, find the angle between them. You through a small ball vertically up in the air. How are the velocity and acceleration of the ball oriented with respect to one another (a) when the ball is going upward (b) when the ball is coming downward? For a projectile motion, is the velocity zero at any instant? Is the acceleration zero at any instant? Construct motion diagrams showing the velocity and acceleration of a projectile at several points along its path, assuming (a) the projectile is launched horizontally and (b) the projectile is launched at an angle θ with the horizontal. An aeroplane while flying horizontally drops a bomb when reaches exactly above the target, but missed it. Explain why? What is the difference between explosion and collision? Give one example of each. Why do a slow-moving loaded truck and a speeding rifle bullet each have a large momentum? What is the difference between elastic and inelastic collision? An object that has a small mass and an object that has a large mass have the same momentum. Which object has the largest kinetic energy? Can object in a system have momentum while the momentum of the system is zero? Explain your answer. For any specific velocity of projection, prove that the maximum range is equal to four times of the corresponding height. Is momentum conserved when a bat hits a ball? On dry concrete, a car can decelerate at a rate of 7.00m/s^2, whereas on wet concrete it can decelerate at only 5.00m/s^2. Compare the distances necessary to stop the car moving at 30.0m/s (about 110km/h) (a) on dry concrete and (b) on wet concrete. Find the angle of projection of a projectile for which the maximum height and corresponding range are equal? A jet plane comes in for a landing with a speed of 100m/s, and its acceleration can have a maximum magnitude of 5.00m/s^2 as it comes to rest. (a) From the instant the plane touches the runway, what is the minimum time interval needed before it can come to rest? (b) Can this plane land on a small tropical island airport where the runway is 0.8km long? Explain your answer.