The initially stationary 24-kg block is subjected to the time-varying force whose magnitude P is shown in the plot. Note that the force is zero for all times greater than 5 s. Determine the time t, at which the block comes to rest. P, N 24 kg 26° HR = 0.43 Hs = 0.51 Answe: ts = i 173 0 S 5 t, s

The roller coaster car has a mass of 900 kg, including its passenger. It is released from rest at the top of the hill A. Neglect friction, the mass of the wheels, and the size of the car. Take hp = 19 m, PB = 9.5 m, hc = 14 m, and pc = 7 m. (Figure 1) Figure h hB B hc C BRE 1 of 1 Part A Determine the minimum height of the hill crest so that the car travels around both inside the loops without leaving the track. Express your answer to three significant figures and include the appropriate units. h = Submit Part B NB = Submit Part C 0 Nc = Value Submit What is the normal reaction on the car when the it is at B? Express your answer to three significant figures and include the appropriate units. μᾶ Request Answer Di μA Value Request Answer LO ☛ μA Units What is the normal reaction on the car when the it is at C? Express your answer to three significant figures and include the appropriate units. Value www Request Answer Units ? Units wwwww ? ?

also determine the force exerted by loop ABCD on the block at point C is _____ N.

A heavy crate with a weight of 160 lbs rests on a floor for which μS = 0.2. Find the minimum force P necessary for impending motion and determine whether the crate slides or tips, given:L1 = 4.4 ft, L2 = 2 ft, θ = 30 °

= The smooth pin P has a mass of 80 g. It is attached to an elastic cord extending from 0 to P and, due to the slotted arm guide, moves along the horizontal circular path r = (0.8 sin ) m. If the cord has a stiffness k 30 kN/m and an unstretched length of 0.25 m, determine the force of the guide and the normal force of the circular path on the pin when 0 = 60°. The guide has a constant angular velocity è = 5 rad/s. T P ė = 5 rad/s 0.

The homogeneous cylinder A has a mass of 80 kg, and the mss of the hub can be neglected. The magnitude of the variable force P, is in newtons when t is in sec- onds. The velocity of body B changes from 2 m/s downward when t = 0 to 4 m/s downward t = 5 s. Determine the mass of B. Solve all questions using Impulse and Momentum methods