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A 50kg box is pushed across the floor with a force of 78N.A retarding force due to friction between the box and the floor also acts on it. If it is starting from rest and attains a kinetic energy of 230J after being pushed 5m. Find out the net force acting on it. What will be the value of the retarding frictional force described above that opposes the motion?
142.3 cm and not more than 142.6 cm. What is the relative uncertainty of the measurement
Water at 20-C flows from a reservoir out a 100-m-long, 4-cm-diameter galvanized iron pipe to the atmosphere. The outlet is 20 m below the surface of the reservoir. What is the exit velocity
A 20 kg box is pushed a crossed the floor. Starting from rest, the speed of the box after 5 seconds is 1.6 m/s. What net force acts on the box
A 40 kg child stands on the edge of a rotating merry-go-round with a radius of 2m. The moment of inertia of the merry-go-round is 200 kg-m^2. If the catch takes 0.4 seconds, find the average torque on the merry-go-round during the catch
A rifle with a barrel length of 59 cm fires a 8 g bullet with a horizontal speed of 350 m/s, What resistive force (assumed to be constant) does the wood exert on the bullet
A hotel elevator ascends170m with a maximum speed of5.4m/s. How long does it take to make the complete trip from bottom to top
A 30 cm spring is compressed to 2 cm. a force of 200 N was used to do this. How much potential energy is stored in the spring
a 2.55-kg model rocket is launched vertically upward with sufficient initial speed to reach a height of 2.83middot102 m
A parallel-plate capacitor is constructed from two 13cm X 13cm electrodes spaced 0.90mm apart. The capacitor plates are charged to ± 20nC, How much energy is stored in the capacitor
How far apart must two protons be if the Coulomb force between them is equal to the weight of a single proton at the earth's surface? Assume that the two protons are far removed from any other charges. The charge of the proton is 1.60x10 -19 C, an..
A bowling ball (I=(2/5)mr2) is rolling up a track without slipping. Determine the balls velocity when it is 2.6 meter above the ground
A thermos contains 151 cm3 of coffee at 85.7 °C. To cool the coffee, you drop two 10.6-g ice cubes into the thermos. What is the final temperature of the coffee in degrees Celsius
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