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A 35.0-kg child swings in a swing supported by two chains, each 2.92 m long. The tension in each chain at the lowest point is 352 N.
(a) Find the child's speed at the lowest point.
_____ m/s
(b) Find the force exerted by the seat on the child at the lowest point. (Ignore the mass of the seat.)
_____N (upward)
As part of a safety investigation, two 1200- {rm kg} cars traveling at 24- {rm m/s} are crashed into different barriers.
After falling from rest from a height of 30m, a 0.5 kg ball rebounds upward, reaching a height of 20 m. what average force was exerted on the ball
Two charges are placed on the x axis. One of the charges q1= +8.5 C is at x1 = + 3.0 cm and the other q2= -21C is at x1 = + 9.0 cm. Find the net electric field (magnitude and direction) at.
A rigid tank contains 1.50 moles of an ideal gas. Determine the number of moles of gas that must be withdrawn from the tank to lower the pressure of the gas from 27.4 atm to 4.30 atm
A small metal ball with a mass of 6.19 g and a charge of 6.15 mC is located at a distance of 0.67 m above the ground in an electric field of 11.5 N/C directed to the east
Imagine that the temperature of a 225 g block of aluminum sitting in the sun increases from 275 K to 300 K
A 2.4 kg breadbox on a frictionless incline of angle %u03B8 =43 is connected, by a cord that runs over a pulley, What is the speed of the box when it moves 10 cm down the incline
An objects angular momentum changes by 10 kgm^2/s in 2.0 s. What magnitude average torgue acted on this object
The drawing shows the potential at five points on a set of axes. find the magnitude of the electric field in the vicinity of the origin
A +2.7 µC charge is 32 cm to the right of a -5.3 µC charge. At the midpoint between the two charges, determine the potential and the electric field
Suppose the tension in a cord is 14.0 N. If the speed of a wave in the cord is 8.50 m/s, then what must be the linear mass density of the cord
A bug crawls outward from the center of a compact disc spinning at 160 revolutions per minute. The coefficient of static friction between bug's sticky feet and disc surface is 1.10.How far does the bug get from the center before slipping.
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