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The author's cat enjoys chasing chipmunks in the front yard. In this game, the cat sits at one edge of a yard that is w = 29 m across (see figure), watching as chipmunks move toward the center. The cat can run faster than a chipmunk, and when a chipmunk moves more than a certain distance L from the far end of the yard, the cat knows that it can catch the chipmunk before the chipmunk disappears into the nearby woods. If the cat's top speed is 7.0 m/s and a chipmunk's top speed is 4.2 m/s, find L. Assume the chipmunk and cat move along the same straight-line path.
When two resistors are connected in parallel across a battery of unknown voltage, What current will be supplied by the same battery
Two forces parallel to the x axis do 16.8 J of work on a small tray while moving it 17.5 m in the x direction across a gym floor. What is the other force
At a fabrication plant, a hot metal forging has a mass of 75 kg and a specific heat capacity of 430 J/(kg·°C). To harden it, the forging is immersed in 710 kg of oil that has a temperature of 32°C and a specific heat capacity of 2900 J/(kg·°C).
An object is placed directly between a large planet and a star. Find the distance from the planet for which the net gravitational force exerted by the planet
A downward force of 60 N is exerted on the top of the book by a hand pushing down on the book. What is the gravitational force acting on the book
The Paschen series in the hydrogen emission spectrum is formed by electron transitions from ni > 3 to nf = 3. What is the longest wavelength in the Paschen series
A pencil is held perpendicular to the optical axis of a concave spherical mirror. The pencil is 91 cm from the center of the mirror, What is the magnification of the pencil's image
Rock 1 is thrown straight down from a tower. Rock 2 is thrown straight up from the same height at the same speed as rock 1. find which rock will have the greatest speed
A radio controlled car increases its kinetic energy from 4J to 12J over the distance of 2 m. What was the average net force on the car during this interval.
the magnetic field amplitude of an electromagnetic wave is 8.5E-7 T. Calculate the ampitude of the electric field if the wave is travelling in Air
A 965-kg satellite orbits the Earth at a constant altitude of 94-km. What is the change in the system's potential energy
Three forces act on an object. A 2 N force acts due east and a 3 N force acts due north. If the net force on the object is zero, what is the magnitude of the third force?
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