Engineering Mechanics 7th Edition solutions

Engineering Mechanics 7
During a pregame warmup period, two basketballs collide above the hoop when in the positions shown. Just before impact, ball 1 has a velocity v1 which makes a 30 angle with the horizontal. If the velocity v2 of ball 2 just before impact has the same magnitude as v1, determine the two possible values

Engineering Mechanics 7
The 50-kg crate is projected along the floor with an initial speed of 7 m/s at . The coefficient of kinetic friction is 0.40. Calculate the time required for the crate to come to rest and the corresponding distance x traveled. Problem 3/1

Engineering Mechanics 7
The position of the small \(0.5-\mathrm{kg}\) blocks in the smooth radial slots in the disk which rotates about a vertical axis at \(O\) is used to activate a speed control mechanism. If each block moves from \(r= 150 \mathrm{~mm}\) to \(r=175 \mathrm{~mm}\) while the speed of the disk changes slowly

Engineering Mechanics 7
Determine the vertical rise h of the load W during 5 seconds if the hoisting drum wraps cable around it at the constant rate of 320 mm/s. Problem 2/211

Engineering Mechanics 7
The system is released from rest with no slack in the cable and with the spring stretched 200 mm. Determine the distance s traveled by the 10-kg cart before it comes to rest (a) if m approaches zero and (b) if . Assume no mechanical interference. Problem 3/108

Engineering Mechanics 7
The particle A is mounted on a light rod pivoted at 2/224 O and therefore is constrained to move in a circular arc of radius r. Determine the velocity of A in terms of the downward velocity of the counterweight for any angle . Problem 2/223

Engineering Mechanics 7
In manipulating the dumbbell, the jaws of the robotic device have an angular velocity p 2 rad/s about the axis OG with  fixed at 60 . The entire assembly rotates about the vertical Z-axis at the constant rate  0.8 rad/s. Determine the angular velocity and angular acceleration  of the dumbbell. Exp

Engineering Mechanics 7
The 10-kg steel sphere is suspended from the 15-kg frame which slides down the incline. If the coefficient of kinetic friction between the frame and incline is 0.15, compute the tension in each of the supporting wires A and B. Problem 3/19

Engineering Mechanics 7
The 50-kg crate of Prob. 3/1 is now projected down an incline as shown with an initial speed of 7 m/s. Investigate the time t required for the crate to come to rest and the corresponding distance x traveled if (a) and (b) . Problem 3/2

Engineering Mechanics 7
The 180-lb man in the bosuns chair exerts a pull of 50 lb on the rope for a short interval. Find his acceleration. Neglect the mass of the chair, rope, and pulleys. Problem 3/8

Engineering Mechanics 7
A Formula-1 car encounters a hump which has a circular shape with smooth transitions at either end. (a) What speed vB will cause the car to lose contact with the road at the topmost point B? (b) For a speed km/h, what is the normal force exerted by the road on the 640-kg car as it passes point A? Pro

Engineering Mechanics 7
The uniform rod of mass m is freely pivoted about point O. Assume small oscillations and determine an expression for the damping ratio \(\zeta\). For what value \(c_{\mathrm{cr}}\) of the damping coefficient c will the system be critically damped?

Engineering Mechanics 7
The 100-lb crate is carefully placed with zero velocity on the incline. Describe what happens if (a) and (b) Problem 3/3

Engineering Mechanics 7
The pilot of an airplane pulls into a steep 45 climb at 300 km/h and releases a package at position A. Calculate the horizontal distance s and the time t from the point of release to the point at which the package strikes the ground. Problem 2/90

Engineering Mechanics 7
Determine the angular velocity of the telescoping link AB for the position shown where the driving links have the angular velocities indicated. Problem 5/66

Engineering Mechanics 7
A mechanism for pushing small boxes from an assembly line onto a conveyor belt is shown with arm OD and crank CB in their vertical positions. For the configuration shown, crank CB has a constant clockwise angular velocity of Determine the acceleration of E. Problem 5/156

Engineering Mechanics 7
The inclined block A is given a constant rightward acceleration a. Determine the range of values of for which block B will not slip relative to block A, regardless of how large the acceleration a is. The coefficient of static friction between the blocks is . Problem 3/38

Engineering Mechanics 7
The two V-belt pulleys form an integral unit and rotate about the fixed axis at O. At a certain instant, point A on the belt of the smaller pulley has a velocity , and point B on the belt of the larger pulley has an acceleration as shown. For this instant determine the magnitude of the acceleration o

Engineering Mechanics 7
What fraction n of the weight of the jet airplane is 15 the net thrust (nozzle thrust T minus air resistance R) required for the airplane to climb at an angle with the horizontal with an acceleration a in the direction of flight? Problem 3/6

Engineering Mechanics 7
At the instant when , the horizontal guide is given a constant upward velocity m/s. For this instant calculate the force N exerted by the fixed circular slot and the force P exerted by the horizontal slot on the 0.5-kg pin A. The width of the slots is slightly greater than the diameter of the pin, an