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An object of mass 5.00 kg, attached to a spring scale, rests on a frictionless, horizontal surface as in Figure P6.21. The spring scale, attached to the front end of a boxcar, has a constant reading of 18.0 N when the car is in motion.
(a) If the spring scale reads zero when the car is at rest, determine the acceleration of the car.
(b) What constant reading will the spring scale show if the car moves with constant velocity?
(c) Describe the forces on the object as observed by someone in the car and by someone at rest outside the car.
An unstable particle at rest breaks up into two fragments of unequal mass. The mass of the lighter fragment is equal to 2.60 10-28 kg, what is the speed of the heavier fragment
A circular conducting loop carries a current of 5.0 A and has radius 30 mm, Calculate the magnetic field at the centre of the loop (H) How many turns would be needed to give a field of 1.0 mT
(a) The displacement of a particle (in meter) is given by d= (20+3t^3)(i)+(4t^2-t-15)(j).What is its distance (use polar format) from the origion at t =2.00s.
The outer surface of a skier's clothes of emissivity 0.700 is at a temperature of 7.40° C. Find the rate of radiation if the skier has a surface area of 1.50 m2
A disk of radius .3 meters and mass of .5kg is held over another disk of radius .5 meters and mass 1 kg which is rotating in a horizontal plane at a rate of 15.92 rev/sec. The top disk is released and drops onto the bottom disk (centers align). Wh..
The cheetah can reach a top speed of 114 km/h (71 mi/h). While chasing its prey in a short sprint, Determine the cheetah's average acceleration during the short sprint
A ball is tossed vertically upward with an initial speed of 26.4m/s. How long does it take before the ball is back on the ground
A uniform cylindrical turntable of radius 1.80 m and mass 25.2 kg rotates counterclockwise in a horizontal plane with an initial angular speed of 4pi rad/s. Find the final angular speed of the clay and turntable
A rescue helicopter lifts a 60 kg person straight up by means of a cable. The person has an upward acceleration of 0.70 m/s2, How much work is done by the person's weight
How many moles of air are left in the tire?
A 1.60 kilogram snowball is fired from a cliff 11.9 meter high with an initial velocity of 13.3 m/s, directed 47.0 degree above the horizontal. Determine what is that speed if the mass is changed to 3.50 kilogram
if a plywood box designed to store an unmanned air vehicle has length-width-height dimensions of 3.0 x 2.0 x 1.0 ft and
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