PEARSON ETEXT ENGINEERING MECH & STATS
15th Edition
ISBN: 9780137514724
Author: HIBBELER
Publisher: PEARSON
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A 9.6-Mg truck is resting on the deck of a barge which displaces 206 Mg and is at rest in still water. If the truck starts and drives toward
the bow at a speed relative to the barge vrel = 9.7 km/h, calculate the speed v of the barge. The resistance to the motion of the barge
through the water is negligible at low speeds.
l'rel = 9.7 km/h 9.6 Mg
206 Mg-
Answer: v = i
km/h
A 8.7-Mg truck is resting on the deck of a barge which displaces 235 Mg and is at rest in still water. If the truck starts and drives toward the bow at a speed relative to the barge vrel = 7.5 km/h, calculate the speed v of the barge. The resistance to the motion of the barge through the water is negligible at low speeds.
A section of track for a roller coaster consists of two circular arcs ABC and CD joined by a straight portion BC. The radius of AB is 27 m and the radius of CD is 72 m. The car and its occupants, of total mass 250 kg, reach point A with practically no velocity and then drop freely along the track. Determine the normal force exerted by the track on the car as the car reaches point B . Ignore air resistance and rolling resistance.
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- (b) The 8735 kg helicopter is takes off vertically with its rotor exerting a constant upward thrust of 117 kN. Determine how far it has risen if its velocity is 11 m/s.arrow_forwardThe 180-g slider has a speed v= 1.4 m/s as it passes point A of the smooth guide, which lies in a horizontal plane. Determine the magnitude R of the force which the guide exerts on the slider (a) just before it passes point A of the guide and (b) as it passes point B. Answers: (a) R₂ = (b) RB = i i -200 mm B N Narrow_forwardThe 195-g slider has a speed v = 1.9 m/s as it passes point A of the smooth guide, which lies in a horizontal plane. Determine the magnitude R of the force which the guide exerts on the slider (a) just before it passes point A of the guide and (b) as it passes point B. Answers: (a) RA= (b) RB i i 225 mm B N Narrow_forward
- (b) A packet of mass 5 Kg leaves the point A with velocity V=0.85 over a smooth belt. To deliver the packet at B without slipping on the belt Determine the speed of the belt. If the radius of curvature of the curve is 3 m Calculate the normal force exerted on the packet 4 m В VBarrow_forward2. If the rocket is to land on the surface of the planet, determine the required free-flight speed it must have at A' so that the landing occurs at B. How long does it take for the rocket to land, in going from A' to B? The planet has no atmosphere, and its mass is 0.6 times that of the earth. Take G = 34.4(10 ")(lb • ft² )/slug², Mẹ = 409(10²') slug, 1 mi = 5280 ft. A+ B' Y A' = 2000 mi 4000 mi -10 000 miarrow_forwardi need the answer quicklyarrow_forward
- Q4) The 100 kg crate shown is originally at rest on the smooth horizontal surface. If a towing force of 200 N, acting at an angle of 45°, is applied for 10 s, determine the final velocity and the normal force which the surface exerts on the crate during this time interval. 200 N 450arrow_forwardThe 12-Mg truck drives onto the 396-Mg barge from the dock at 17 km/h and brakes to stop on the deck. The barge is free to move in the water, which offers negligible resistance to motion at low speeds. Calculate the speed of the barge after the truck has come to rest on it. 17 km/h 396 Mg 12 Mg Answer: v = km/harrow_forwardA 100 Ib ball at the end of a cable revolves at a constant speed of vo 8 ft/sec in a horizontal plane. If the length of the cable is 4ft, determine the tension in the cable.arrow_forward
- A 2197 lb car starts from rest at point 1 and moves without friction down the track shown. Determine the force (lb) exerted by the track on the car at point 2 if a = 47 ft, b = 10 ft and r = 25 ft.arrow_forwardA 9.1-Mg truck is resting on the deck of a barge which displaces 261 Mg and is at rest in still water. If the truck starts and drives toward the bow at a speed relative to the barge vrel = 9.6 km/h, calculate the speed v of the barge. The resistance to the motion of the barge through the water is negligible at low speeds. Vrel = 9.6 km/h 9.1 Mg 261 Mg Answer: v = i km/harrow_forwardA two-engine jet transport has a loaded weight of 97000 lb and a forward thrust of 9340 lb per engine during takeoff. If the transport requires 6400 ft of level runway starting from rest to become airborne at a speed of 150 knots (1 knot = 1.151 mi/hr), determine the average resistance R to motion over the runway length due to drag (air resistance) and mechanical retardation by the landing gear.arrow_forward
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