The graph shows the results obtained by a student who designed an experiment to determine the value of the acceleration due to free fall, g, using a falling ball bearing and a pair of light gates. The value obtained is inaccurate.
Which of the following could have contributed to the inaccurate value of g obtained by the student?
Measured values of h are too large due to parallax error
Plotting against t
The ball bearing colliding with the light gate when travelling through
An increase in measured values of t due to residual magnetism in the release mechanism
An object is projected in a vacuum chamber and in a playing field (where air resistance is taken into account). Otherwise, all initial conditions are equivalent.
Which graph shows correct trajectory for the object in the vacuum chamber and in the playing field?
A projectile is fired from level ground with speed v at an angle θ to the ground. Ignoring air resistance, which of the following is a correct expression for the maximum height reached by the projectile?
Baseball player Y throws a ball to baseball player X as shown.
What is the direction of the net force on the ball at the instant shown, if air resistance is not neglected?
Question 8
Marks: 1
On a clear day, in the absence of air resistance, a cannon ball is fired at an angle θ to the ground with an initial velocity u. Its horizontal range is s. Which of the following statements is incorrect?
The time of flight is
The time of flight is where g is the acceleration of free fall
The shadow of the cannon ball moves with a constant velocity while the ball is in flight
The linear momentum of the cannon ball is constant during flight
A body of mass m is projected at an angle φ to the horizontal in a gravitational field. Its trajectory is parabolic and follows the path PQRST. These points are the position of the body along its trajectory at equal time intervals, with T being the object's maximum height.
A small uniform bob is attached to a simple pendulum, and set into motion from some angular displacement. When the bob passes through the lowest point of its motion, the pendulum is cut. If, at this instant, the bob is moving with a speed of v m s–1, at a height h above ground, how far away does the bob land from a position measured directly under the point at which the pendulum is cut?