Search & Filtering
Peter wants to move a cabinet, with a mass of 90 kg ,across the floor.
1.what is the magnitude of static friction force before Peter touches the cabinet?
2.He increases the force to 200N , but tge cabinet does not move. what is the static frictional force?
3. A force of 350N is needed to bring the cabinet into motion. calculate the coefficient of static friction.
4. when Peter continues to push the crate ,he exerts a force of 300N to keep it moving at a constant velocity. calculate the coefficient of kinetic friction.
a 80 mm crankshaft main bearing journal rotates at 3000 rev/min while carring a normal load w= 20kN. If the coefficient of friction in the bearing =0.02, calculate the power lost in friction at this engine speed
A swimmer wishes to take a horizontal running start when jumping of a cliff of height h m. At the bottom of the cliff there is an exposed reef of width w m. At what speed v0 must the swimmer be running when leaving the top of the cliff, if she is to just miss hitting the reef at the bottom to enter the water? Your answer will be some expression in h, w and g = 9.8 m/s2.
A 2500 kg car moving at a speed of 22.0 m s−1 and a 3450 kg van moving at a speed of 15.0 m s−1 are moving at aright angles to each other and collide as shown in the figure above.
The car and van stick together in the collision. What is the speed of the car+van after the collision? (in m s−1 to 3 s.f)
A particle executes simple harmonic motion with an amplitude of 2.7 cm. At what positive displacement from the midpoint of its motion does its speed equal one half of its maximum speed? Answer in units of cm.
A 2500 kg car moving at a speed of 22.0 m s−1 and a 3450 kg van moving at a speed of 15.0 m s−1 are moving at aright angles to each other and collide as shown in the figure above.
The car and van stick together in the collision. What is the speed of the car+van after the collision? (in m s−1 to 3 s.f)
A uniform beam 6.0m and weighing 40N at the center,rests on two supports, P and Q placed 1.0m from each end of the beam. Weights of 100N and 80N are hung from the ends of the beam near P and Q respectively. Calculate the reactions at the supports P and Q.
5) A block-spring system oscillates in a simple harmonic motion on a frictionless horizontal table. Its displacement varies with time according to x (t) = 0.2 cos (2t - n / 4). The earliest time the particle reaches position x = 0.1 m is
A tourist, who weighs 805 N, is walking through the woods and crosses a small horizontal bridge. The bridge rests on two concrete supports, one at each end. He stops one-fourth of the way along the bridge. Assume that the board of the bridge has negligible weight. What is the magnitude of the vertical force that a concrete support exerts on the bridge at the far end?
Jimmy is about to take part in the high dive. He jumps up off the high board at an angle of 23 degrees with an initial velocity of 2.5m/s. How far does Jimmy travel before he hits the water (horizontal distance). Consider air resistance
