Chapter 13, Problem 36P

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Two identical 16-kg spheres are attached to the light rigid rod, which rotates in the horizontal plane centered at pin Part A: If the spheres are subjected to tangential forces of P = 10 N, and the rod is subjected to a couple moment M=(8t)N⋅mM=(8t)N⋅m, where t is in seconds, determine the speed of the spheres at the instant t = 4 s. The system starts from rest. Neglect the size of the spheres. Express your answer to three significant figures and include the appropriate units.

The 167-kg lunar lander is descending onto the moon's surface with a velocity of 5.0 m/s when its retro-engine is fired. If the engine produces a thrust Tfor 4.2 s which varies with the time as shown and then cuts off, calculate the velocity of the lander when t = 5.7 s assuming that it has not yet landed. Gravitational acceleration at the moon's surface is 1.62 m/s?. The velocity is positive if moving downward, negative if up. 5.0 m/s T,N 685 2.1 4.2 t, s Answe: v = m/s

A freight elevator, including its load, has a mass of 1.1 Mg. It is prevented from rotating due to the track and wheels mounted along its sides. If the motor M develops a constant tension T = 6.9 kN in its attached cable, determine the velocity of the elevator when it has moved upward 7.2 m starting from rest. Neglect the mass of the pulleys and cables.

The 5-lb collar is released from rest at A and travels along the frictionless guide. Determine the speed of the collar when it strikes the stop B. The spring has an unstretched length of 0.5 ft. -k = 4 lb/ft 15 ft

The 600-kg bar B, originally at rest, is towed over a series of small rollers. The motor M is drawing in the cable at a rate of v = (0.3 t2) m/s, where t is in seconds. Determine the force in the cable when t = 2 s

Q: If the rod of negligible mass is subjected to a couple moment of M (30t2)N m and the engine of the car supplies a traction force of F = (15t)N to the wheels, where t is in seconds, determine the speed of the car at the instant t = 8 s. The car starts from rest. The total mass of the car and rider is %3D 200 kg. Neglect the size of the car. 6 m M (30r) N-m

r= 0.3 (1 + cos 0) m 500 N/m The 3-kg collar slides along the smooth rod after being nudged from rest at A, and travels along the rod to pass point B. Given that the free length of the spring is 100 mm and that r is the actual length of the spring: Draw Free Body Diagrams for the collar at position A and at position B.

The spring in the toy gun has an undeformed length of 110.1 mm. It compresses and stops at the position shown. When the trigger is pulled, the spring decompresses 8.3 mm, and the 16.4-g ball moves down the barrel. Determine the speed in m/s of the ball as it leaves the gun. Neglect friction. k = 2 kN/m 50 mm D -150 mm B