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Water is flowing in a drainage channel of rectangular cross-section. At one point, the width of the channel is 12 m, the depth of water is 6.0 m, and the speed of the flow is 2.5 m, the depth of water is 6.0 m, and the speed of the flow is 2.5 m/s. At a point downstream, the width has narrowed to 9.0 m, and the depth of water is 8.0 m. What is the speed of the flow at the second point?
A jet plane lands with a speed of 88 m/s and can accelerate at a maximum rate of -4.40 m/s2 as it comes to rest. What is the actual minimum distance needed to stop the plane
Suppose the act of throwing the tool takes the austronaut 0.7 seconds, that is she applied a force to the tool before it leaves her hand. What velocity toward the space shuttle will that have given her? And if she was 12m away from the shuttle to sta..
A movie camera with a (single) lens of focal length 90 mm takes a picture of a person standing 21 m away. If the person is 180 cm tall, what is the height of the image in millimeters
A block is on a horizontal surface (a shake table) that is moving back and forth horizontally with simple harmonic motion of frequency 2.3 Hz. How great can the amplitude of the SHM be
The Mars rover was deployed on the surface of Mars in July 1997. At one point during its subsequent mission, radio signals took about 9 min to travel from Earth to the rover. How far was Mars from the from Earth at that time? ___________m
Three point charges are on the x-axis. The first is located at -4meters and has a charge of -6 coulombs. compute the net force on the charge at the origin
Two objects are moving along the x axis with velocities of 37 m/s (object 1) and -15 m/s (object 2). which object has the greater mass
A nuclear power plant has an electrical power output of 1800 MW and operates with an efficiency of 30%. what is the rise in temperature of the flowing water
A 200-kg roller coaster car travels over the top of a 40-m high hill (Hill A) traveling at 10 m/s. find the speed of the car at the top of the second hill
A spring of negligible mass has force constant = 1500 . How far must the spring be compressed for an amount 3.10 of potential energy to be stored in it? Find the maximum distance the spring will be compressed
An eagle can determine that two light brown shrews sitting 1.0 cm apart on a pathway 125 m below her are in fact two shrews rather than a small rat. estimate the diameter of her pupil
A toroid of mean radius 27 cm and circular cross section of radius 1.7 cm is wound with a superconducting wire of length 1000 m that carries a current of 350 A. What is the magnetic field at the mean radius
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