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A boy wishes to row across a river in the shortest possible time. He can row at 2 m/s in still water and the river is flowing at 1 m/s. Find at what angle theta should he point the bow (front) of his boat?
A basketball player makes a jump shot. The 0.700-kg ball is released at a height of1.80 m above the floor with a speed of7.00 m/s. What is the work done on the ball by air resistance
A farsihted man utilizes eyeglasses with a refractive power of 3.71 diopters. Wearing the glasses 0.026 m from his eyes, he is able to read books held no closer than 0.260 m from his eyes.
A Pyrex flask in a refrigerator at 1?C is filled to the top and holds exactly 1000 cm3 of ethyl alcohol. If the refrigerator fails, how much alcohol spills by the time the temperature reaches 28?C
A string of length L vibrates at its fundamental frequency. The amplitude at a point ¼L from one end is 5.40 centimeter. Find the amplitude of each of the traveling waves that form this standing wave
What is moment of inertia
Illustrate what constant acceleration does Mary now need during the remaining portion of the race, if she wishes to cross the finish line side-by-side with Sally?
In the Atwood machine shown below, m1 = 2.00 kg and m2 = 5.35 kg. The masses of the pulley and string are negligible by comparison. The pulley turns without friction and the string does not stretch. The lighter object is released with a sharp push th..
A capacitor is placed parallel across a resistive load in a circuit. C=0.858*10^-6F and R=204 ohms. What fraction of the current goes through the capacitor
A geode is a hollow rock with a solid shell and an air-filled interior. Suppose a particular geode weighs twice as much in air as it does when completely submerged in water. what fraction of the geode's volume is hollow
In an L-R-C series circuit, the resistance is 420 ohms, the inductance is 0.300 henrys, and the capacitance is 1.20×10?2 microfarads. what maximum voltage amplitude can the source have
A certain projectile is launched with an initial speed v0. At its highest point its speed is v0 / 4. What was the launch angle
An insulated Thermos contains 145 cm3 of hot coffee at 89.0 °C. You put in an 11.0 g ice cube at its melting point to cool the coffee. By how many degrees (in Celsius) has your coffee cooled once the ice has melted and equilibrium is reached? Treat c..
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