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1. A ball is thrown horizontally from a high window at 6 m/s and reaches the ground after 2 s. Calculate:
a) the horizontal distance travelled
b) the vertical speed at impact.
2. A stone thrown horizontally from a cliff lands 24 m out from the cliff after 3 s. Find:
a. the horizontal speed of the stone
b. the vertical speed at impact.
3. A ball is projected horizontally at 15 m/s from the top of a vertical cliff. It reaches the ground 5 s later.
a. Calculate the horizontal distance it travels in 5seconds
b. What was its vertical speed just before it hit the ground?
Two blocks (m=16 kg and M=89.5kg) are in contact, but not attached to each other. The coefficient of static friction between the blocks is 0.383, but the surface between the larger block is frictionless. What is the minimum magnitude of the horizontal force F required to keep the smaller block from slipping down the larger block?
A ship following a course of 247° for 50 km. At the end of this course, the ship then went east-ward for another 101 km, and then 95 km due south before setting to a final course of 100° for 100 km. Find the resultant vector R. Express it in vector form and in simplest directional statement.
1. a small bathroom has two very hard walls on opposite sides of the room at a distance of 2.55m. these walls reflect sound so that sound waves have nodes at the walls. for which approximate frequency can a standing wave occur between the walls (resonance).
2. a container holding 1 liter is filled with air of room temperature (20 degrees Celsius) and normal atmospheric pressure. it is compressed to half volume and cooled to -53 celsius, what is the pressure in the air.
4. an electron is accelerated from the rest of a static electric field by a potential difference of 0.51 MV. what speed do the electrons get?
5. a point particle moves in space so that its position vector is given by: ((x (t), y (t), z (t)) = (f (t / x), g (2t / x), h ( 3t / x)) where f, g and h are three periodic functions with period 1 and x is a constant, what is the average of a velocity vector from time t to t + x.
Explain the inelastic collision.
a car accelerate from rest to reach a certain speed in 10 min. it then continues at this speed for another 10 minutes and decelerate to rest in another 5 min, the total distance covered is 17.5km. find the steady speed reached
A body of mass 25kg, moving at 3m/s on a rough horizontal floor is brought to rest after sliding through a distance of 2.5m on the floor. What is the coefficient of sliding friction (g=10)
What is free fall motion.
What is angulat momentum.
Two boxes of fruits moving with constant velocity on a rough surface are connected by a light string, as shown in the figure, with m1 = 20.0 kg and m2 = 30.0 kg. A force of 70.0 N is applied to the 30.0-kg box at an angle of = 30 with the horizontal. The coefficient of kinetic friction between each box and the surface is the same. Calculate the coefficient of kinetic friction between each box and the surface, and the magnitude of the tension in the string.
