Relative Acceleration
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An elevator car whose floor-to-ceiling distance is equal to 2.7 m starts ascending with constant acceleration 1.2 m/s2. 2s after the start, a bolt begins falling from the ceiling of the car. Find:
(a) the bolt's free fall time;
(b) the displacement and the distance covered by the bolt during the free fall in the reference frame fixed to the ground.
t = 0.7 sec, s = 0.7 m, x = 1.3 m
t = 0.7 sec, s = 2.7 m, x = 2.7 m
t = 0.7 sec, s = 0.7 m, x = 0.7 m
t = 0.7 sec, s = 0.7 m, x = 2.7 m
On a two-lane road, car A is travelling with a speed of 36 km/hr. Two cars, B and C approach car A in opposite directions with a speed of 54 km/h. At a certain instant, when the distance AB is equal to AC, both 1 km, B decided to overtake A before C does. What minimum acceleration of car B is required to avoid an accident.
A pendulum made of a uniform wire of cross sectional area A has time period T. When an additional mass M is added to its bob, the time period changes to TM. If the Young’s modulus of
(g = gravitational acceleration)