A box of mass 400 kg is supported on a spring scale on the floor of a goods Ilft. The is 1900 kg. The lift is travelling from the 20th floor to the ground floor. At an instant when the deceleration of the lift is 1.2 ms as it approaches the ground floor, what is the readi oolo?
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- RAIL LINES CROSS COUNTRY MOVERS OO 00 theta A 13,129-lb truck enters an emergency exit ramp at a speed of 112.4 ft/s. It travels for 7.9 s before its speed is reduced to 24.5 ft/s. Determine the braking force by the truck if the acceleration is constant. (Use Impulse-Momentum concepts.) Assume theta = 21.4 degrees Calculate your answer to two decimal places. Report your answer in pounds of force (lbf).Hazel stands on the edge of a lookout admiring the view of a waterfall. The lookout is supported by a horizontal beam and a strut that makes an angle of 70° with the vertical. Hazel's mass is 60 kg 70° What is the horizontal force along the beam at the spot where she is standing? Use g = 9.81 m/s? for the acceleration due to gravity. Give your answer to the nearest Newton. Select one: a. 1721 N • b. 214 N c. 1617 N d. 626 NThe uniform 51-kg slender bar is initially at rest on a smooth horizontal plane when the forces are applied. If P1 = 23 N and P2 = 73 N, determine it angular acceleration (in rad/s?). Please pay attention: the numbers may change since they are randomized. Your answer must include 2 places after the decimal point. P1 0.75 m 0.5 m -1.75 m P2
- 1. 500 kg roller starts from a point A as shown in the diagram below. If throughout its travel the average retarding force due to air friction on the wheel is 200 N. What is its speed at points B and C given that |AB| = 100 m and |BC| = 50 m. How far will it travel at the | elevation of C before coming to rest? A 20 m 5 mThe sphere with mass m = 25 kg rolls down the inclined plane of angle = 25° without slipping. Determine its angular acceleration (in rad/s²). Please pay attention: the numbers may change since they are randomized. Your answer must include 2 places after the decimal point. Take g = 9.81 m/s². 0.15 m Your Answer: G 0 Answer AQUESTION 15 The casting has a mass of 3 Mg. Suspended in a vertical position and initially at rest, it is given an upward speed of 2000 mm/s in 0.3 s using a crane hook H as shown in Figure Q15. Determine the tension in cables AC and AB during this time interval if the acceleration is constant. OA 17.1 kN OB. 27.5 KN OC. 18.1 kN OD. 28.5 KN
- In a rope-climbing competition, all of the lifting is done by the arms; legs can only dangle. Imagine 220-lb Garvin Smith in training, hanging stationary from the rope, his legs off the floor. When prompted by his coach, he rapidly lifts his center of mass by 4 ft. in 0.65 s. Calculate Garvin Smith's acceleration. Round the final answer to one decimal place. Determine the net force (“force imbalance”) producing the acceleration. Round the final answer to one decimal place. Which forces are acting on Smith? (Note that his arms are part of himself, so they cannot exert a force on Smith.) With what magnitude force is Smith pulling down on the rope? Round the final answer to one decimal place. The force of 130.2 lb points _____.PROBLEM 2.7 7. A train running at 80 kph decelerates at 3 m/min? for 18 minutes. Find the distance travelled within this period. а. 16.14 km c. 18.14 km 17 LECTURE NOTES IN ENGINEERING MECHANICS b. 17.14 km d. 19.14 kmA crane is lifting a system with a constant speed. The weight of each object is shown. Neglect the mass of the cables. Note that K stands for Kipps [1K = 1,000lbs] and is a unit of force. Do NOT convert or multiply by g. cable 1 How many forces are acting on the ring? 4. ring (2K) 6 How many forces are acting on the spreader bar? cable 2 cable 3 How many forces are acting on the load? 3. 45° 45° Are the forces on the system balanced? yes v spreader bar (20K) cable 4 cable 5 How much tension in is cable 1? K How much tension in is cable 2? K load (48K) BARNHART K How much tension in is cable 3? K How much tension in is cable 4? K How much tension in is cable 5? check answers'
- pls send me answer of this question all the parts pls and i will rate you sure, pls solve a,b,c and d and also a and b A 200-kg dragster (racing car) exerts a constant force of 4000 N during a race. The coefficient of kinetic friction between the tires and the pavement is .15. If the drag strip is 1000 m long, determine:a. The net force on the dragster. b. The acceleration of the dragster. c. The time it takes for the dragster to finish the race.d. The dragster's velocity at the end of the race.The dragster now needs to slow down, so it opens a parachute. The force of air drag is 3500 N. The driver also locks the brakes of the dragster, and the coefficient of kinetic friction becomes .75. Determine:a. How long it will take to stop the dragster.b. The distance the dragster travels while stopping.A steel cable whose cross-sectional area is 2.5 cm2 supports a 1000-kg elevator. The elastic limit of the cable is 3 x108 Pa. What is the maximum upward acceleration that can be given the elevator if the tension in the cable is to be no more than 20% of the elastic limit? a. т b. If the acceleration of the elevator upward is 6 what is the tension force in the cable?A block is pulled at constant speed along a rough level surface by a ropc that makes an angle of 30° with respect to the horizontal. The applied force along the rope is P . The force of kinetic friction between the block and the surface is 20 N. 30° Which one of the following expressions gives the magnitude of the force P in SI units? O 20(sin 30°) O 10(cos 30) O tan 30 O 20/(cos 30) O 30/(sin 30°) O O O O O