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A long distance runner starts at given place and runs around a circular track of 63m radius at a speed of 6.0m/s in the clockwise (positive) direction for 60 seconds. Then the runner reverses direction and runs in the counterclockwise (negative) direcetion at 4 m/s for 120 s. At then end, how far around the track is the runner from the starting point?
A gnat takes off from one end of a pencil and flies around erratically for 18.1 seconds before landing on the other end of the same pencil. find the gnat\'s average speed
What is the current in the element of an electric clothes dryer with a resistance of 8.2? when it is connected to 240 V
A 250g steel ball and a 500g steel ball each hang from 3.0-m-long strings. At rest, the balls hang side by side, barely touching. To What angle does each ball rebound
If the spring stretches by 2.4cm, what is the coefficient of static friction between the backpack and the table.
A uniform rod of mass 2.95×10?2kg and length 0.380m rotates in a horizontal plane about a fixed axis through its center, What is the angular speed of the rod
a marble column of a cross sectional area 1.5 m^2 suports a mass of 24000 kg, what is the stress within the ciolumn? N/m^2
An airplane flying horizontally 3600 ft above the ground at 120mi/hh, drops relief aid on the ground. Resolve the angle between the vertical and the line joining plane and target at the instant when he package is released.
Suppose the Eskimo is pushing the same 50.0-kg sled across level terrain with a force of 50 N. If he does 4 x 10^2J of work on the sled while exerting the force horizontally, through what distance must he have pushed it.
What is the half life of the sample if the decay rate decay rate decreases from 175 KBq to 12.4kBq in 18 seconds
Find the magnification of the heater element given that the mirror has a radius curvature of 46 cm and produces an image of the coils 2.6m away from the mirror
A microscope with an eyepiece lens of focal length 1.90 cm and an objective lens of focal length 1.15 cm is used to examine a section of the brain of a sacrificed rat. The distance between the lenses of the instrument is 24.0 cm and final image is vi..
How much power is needed to push a 85kg chest at 0.72m/s along a horizontal floor where the coefficient of friction is 0.76
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