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Neglecting air resistance, how long shall it take an object in free fall to have a velocity of 5.0 m/s?
At what velocity shall a dropped object fall a distance of 1.75 m? Neglect air resistance.
A 10-kg metal ball is dropped from the top of a building 5.0 - m high. How long will it take this object to hit the ground? Neglect air resistance.
Neglecting air resistance, how long shall it take an object in free fall to have a velocity of 5.0 m/s?
A spacecraft with a proper length of 300 m takes 0.75 ms to pass an Earth-based observer. Determine the speed of the spacecraft as measured by the Earth observer.
An object of mass moves round a circle of radius 6 m if the if the period of motion is π calculate the force towards the centre
A particle of mass 10-²kg is fixed to the top of a fan blade which rotates with angular velocity of 100rads-¹.if the radius of the blade is 0.2m. the centripetal force is what
A) How much work is done in lifting a 30 kg box from a point A on the
ground to a point B on a platform 1.5 m directly above A?
B) Show that the same amount of work would be done if the box were
carried from ground level by sliding the box along a smooth 3.0 m long plank whose one end rests on the ground away from A and the other end rests on point B.
A skier, starting from rest, skis down a slope from a height of 300 m to the horizontal ground level.
a) Show that the speed with which the skier reaches the ground level does
not depend on either the mass of the skier or the angle of incline of the slope. State any assumptions made.
b) Calculate the speed with which the skier reaches the ground level.
Two identical balls, A and B, are released from rest from the same height, 2.8 m, along two smooth inclined planes that touch the horizontal ground. Ball A is released on a plane inclined at 300 to the horizontal. The plane on which ball B is released is inclined at 600 to the horizontal. Ignore energy due to rotation of the balls. [Diagrams, but no forces]
a) What is the speed of each ball at the bottom of their respective inclined planes?
b) Which ball would reach the bottom first? Explain your answer.
