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13-8. What force does a 180-1b man exert on the floor of an elevator that is moving downward and decelerating at 15 ft/sec2?
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- A block is given an initial velocity of 5.00 m/s up a frictionless incline of angle = 20.0 (Fig. P5.47). How far up the incline does the block slide before coining to rest?15- I. Newton.second/kilogramII. Watts/NewtonsIII.Joule/secondWhich of the above units can be used instead of speed unit? A) I and II B) Only I C) I, II and III D) Only II E) I and IIIThe acceleration of gravity is given as a function of elevation above sea level by the relation to=9.81-3.32x10^-6 h (m/s^2) with 'h' measured in meters. What is the weight of an airplane at 10 km elevation when its weight at sea level is 40kN? Give the complete solution with free body diagram.
- A 29 750 kg airplane travelling at 305 m/s. (b) If it suddenly noses vertically upward at this speed, with power off and in the absence of atmospheric resistance, through what vertical distance will it move? Let the average gravity acceleration be g = 9.78 m/s2. (whole number)14- By what percentage does the drag force on a car increase as it goes from 55 km/h to 108 km/h?A 5.0 kg mass is attached to the ceiling of an elevator by a rope whose mass is negligible. What force does the mass exert on the rope when the elvator has an acceleration of 4.0 m/s2 upward?
- 7 - Calculate the force (W) required to pull an object of mass 100 kg on a frictionless horizontal plane with a constant speed of 5 m/s by applying a force of 122 N making an angle of 37° with the horizontal. a) B) NS) D) TO)The average skydiver, with parachute unopened, weighs 80 kg. Depending on the orientation of theskydiver, whether vertical (upright)or horizontal (lying flat), what are the minimum and maximum terminal speedsattained at an altitude of 2000 mA 225N crate resting on a plane inclined 65-degrees to the vertical, requires a 19N force to bring it down to 6m from its initial position. The force is applied 60-degrees with respect to the horizontal. Neglecting friction, determine the time that the crate had travelled a distance of 6m.
- On Earth at sea level, a rope can sustain a maximum force of 80.7 N before breaking. What is the weight of the heaviest object it can lift vertically while accelerating with a magnitude of 3.07 m/s2 ?During a stormy season, winds can move horizontally at 30 m/s. If air strikes a person at the rate of 40 kg/s/ square meter and is brought to rest, find the force (N) of the wind on a person. The person is 1.40 meter high and 0.35 meter wide.A carton of mass 35kg is at rest on a rough plane inclined at an angle of 25 degrees to the horizontal. Calculate the magnitude of the friction force, in Newton's, to 2 s.f. Take the magnitude of the acceleration due to gravity, g, to be 9.8 ms^-2