Chapter 15, Problem 52P

A 1.2-lb slider is propelled upward at A along the fixed curved bar which lies in a vertical plane. If the slider is observed to have a speed of 10.2 ft/sec as it passes position B, determine (a) the magnitude N of the force exerted by the fixed rod on the slider and (b) the rate i at which the speed of the slider is changing (positive if speeding up, negative if slowing down). Assume that friction is negligible. 26 1.6' Answers: N = i Ib i ft/sec2

vehicles are approaching a road junction, both moving with speed (12.5 m/s). One vehicle has mass 1000 kg and the other mass kg, and the roads meet at an angle of 60° as shown. The vehicles collide and initially move as a single body. ss of Car A= 100 kg ss of Car B = 70 kg A 12.5 m/s B 60° 12.5 m/s culate the magnitude of the velocity of the two vehicles immediately after the collision (treating them as a gle body) (m/s) culate the linear momentum in the vector form of car B. (m/s) culate the linear momentum in the vector form of car A. (m/s) Choose... Choose... Choose... 4

A 5-kg collar A is at rest on top of, but not attached to, a spring with stiffness k1 = 400 N/m when a constant 150-N force is applied to the cable. Knowing A has a speed of 1 m/s when the upper spring is compressed 75 mm, determine the spring stiffness k2 . Ignore friction and the mass of the pulley.

A 1250 kg car moving with a speed of 28.1 m/s runs into the back end of a 9260 kg truck moving with a speed of 22.3 m/s. They are both coasting and moving in the same direction. They stick together. With what speed in m/s do they move after the collision?

Equations for the conservation of energy must be used, the speed that bodies of mass m1 and m2 have after they have traveled a distance "d". Obviously, they must consider the pulley with mass M and radius R. It is necessary to proceed in the case that the masses are equal, and the angles are different. And show the answer with pictures. m₂ m2

Car B is towing car A at a constant speed of 10 m/s on an uphill grade when the brakes of car A are fully applied causing all four wheels to skid. The driver of car B does not change the throttle setting or change gears. The masses of the cars A and B are 1400 kg and 1200 kg, respectively, and the coefficient of kinetic friction is 0.8. Neglecting air resistance and rolling resistance, determine (a) the distance traveled by the cars before they come to a stop, (b) the tension in the cable.

Part A Ball A has a mass of 3 kg and is moving with a velocity of (vA)ı = 8 m/s when it makes a direct collision with ball B, which has a mass of 2.5 kg and is moving with a velocity of (vB)1 = 5 m/s. Suppose that e = 0.8. Neglect the size of the balls. (Figure 1) Determine the velocity of A just after the collision measured to the right. Express your answer to three significant figures and include the appropriate units. Enter positive value if the velocity is directed to the right and negative value if the velocity is directed to the left. HA ? (va)2 = Value Units Submit Request Answer Figure < 1 of 1 Part B Determine the velocity of B just after the collision measured to the right. Express your answer to three significant figures and include the appropriate units. Enter positive value if the velocity is directed to the right and negative value if the velocity is directed to the left. HA ? B (vB)2 = Value Units

Bullet B weighs 0.5 oz and blocks A and C both weigh 3 lb. The coefficient of friction between the blocks and the plane is uk = 0.25. Initially the bullet is moving at vo and blocks A and C are at rest (Figure 1). After the bullet passes through A it becomes embedded in block C and all three objects come to stop in the positions shown (Figure 2). Determine the initial speed of the bullet vo. В A %3D 6 in. (1) 4 in. В PC А (2)

(a) After traveling 145 m along a straight path, a car reaches a speed of 29 m/ s. Determine the particle's constant acceleration and the time of travel if it starts from rest. (b) The 30-g bullet is fired horizontally into the 400-g block which rests on a smooth surface. After the bullet becomes embedded into the block, the block moves to the right 0.39 m before momentarily coming to rest. Determine the speed (v), of the bullet. The spring has a stiffness k = 200 N/ m and is originally unstretched. (V3)1 B K= 200 N/ m A