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the angle of friction is angle: between the reaction force and the plane on whic an object is sliding. Is that true or not? Please help
A rifle bullet can penetrate one plank. If the velocity of the bullet be tripled, how many planks it will penetrate ?
5.2 A particle P moves along a parabolic path y= x, where x and y are expressed in meters. The particle
has a speed of 6 m/s which is increasing at 2 m/s' when x=6 m. Determine the direction of the velocity and
the magnitude and direction of the acceleration at this instant.
A 20 kg object is hangs at the end of a 3.0 m horizontal rod of mass 5.0 kg that is hinged to a pole as shown in figure below. To support the hanging object, a cable is tied at an angle 550 at the middle of the rod. If the cable breaks, find the magnitude and direction of angular acceleration of this system.
A 30-cm-diameter, 10-cm-high vertical cylindrical vessel equipped with a vertical tube at the edge is rotated about its vertical axis at a constant angular velocity of 15 rad/s. If the water rise in the tube is 30 cm, determine the net vertical pressure force acting on the vessel.
The cylindrical tank containing water accelerates upward with az = 2 m/s². while it rotates about its vertical axis by n= 100 rpm. Determine the pressure at point A.
(there's a diagram, but I wish I could attach it).
The velocity of a bullet is 200ms¹ and it can penetrate a plank of thickness 0.03m. What will be the velocity of the bullet if it can penetrate 0.12m plank?
Why F is only external force? What is quantity of motion?
Find the associated potential energy for the force exerted by an elastic spring.
Show the given, required, equation, solution and answer.
A 3.0 kg block is acted upon by a variable horizontal force F(x) = 24.0−9.0x, where the force is in newtons if x is measured in meters. The coefficient of kinetic friction between the block and the flat surface is 0.19. The block is initially at x = 0 m. What distance must the block travel if the net work done on the block by F(x) and friction combined is to be exactly zero?
At what point along the way does the net force on the block reach zero?
