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A river with long, straight, parallel sides 10 km a part flows from north to south at 3 m/s. A swimmer enters the river on the east side and swims due west (i.e., his head is always pointing west) at 2 m/s. How far downstream is the swimmer when he reaches the opposite shore? Explain your answer in detail.
A motorist travelling at 82 km/hr is being chased by a police car at 131 km/hr. If the police car starts from 3.5 km back, how long does it take to catch the motorist? Leave time in hours.
A Super Hero leaps with speed 12 m/s at a 47 degree angle above the horizontal from the top of a building. find the height of the building
A cat is trying to jump onto a countertop that is 1m tall from 0.3m away. The cat's initial jump speed (magnitude of the total initial velocity) is 10m/s
A railroad car is released from a locomotive on an incline. what negative acceleration must it produce to bring the car to rest
What was the bullet's speed as it left the barrel. A 1kg block rests against one end of a horizontal spring which is compressed by 10 $cm$.
A tsunami travelling across deep water can have the speed of 750 {rm km/h} and a wavelength of 360 km. what is the frequency.
A lens has a focal length of 40 mm magnifier. An object viewed with the magnifier is 5.3 mm tall, What is the angular magnification of the magnifier
Assume that 10 g of steam is added to 100 g of water initially at 19°C. The water is inside an aluminum cup of mass 35 g. Find the final temperature of the water after equilibrium is reached
q1. three equal point charges each with a charge of 1.90 mu c are placed at the corners of an equilateral triangle
A student sits on a rotating stool holding two 3.5 kg objects. When his arms are extended horizontally, Find the kinetic energy of the student before and after the objects are pulled in
The frequency doubled output of a Nd3+ YAG laser has a wavelength of 532nm. how many photons does the laser emit at 532nm in 3 minutes
A sample of an ideal gas has a volume of 0.0100 m3, a pressure of 100 103 Pa, and a temperature of 300 K. What is the number of moles in the sample of gas
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