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A man can row a boat at a speed of 7.45 km/h in still water. If he is crossing a river where the current is 2.00 km/h, in what direction should his boat be headed if he wants to reach a point directly opposite his starting point?
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Quesiton: A rock is tossed straight up with a velocity of 20m/s When it returns, it falls into a hole 10 m deep. What is the rock's velocity as it hits the bottom of thehole? How long is the rock in the air, from the ins ...
Question: The siren of a fire engine that is driving northward at 31.0 m/s emits a sound of frequency 2020 Hz. A truck in front of this fire engine is moving northward at 19.0 m/s. a) What is the frequency of the siren's ...
Question: To take off from the ground, an airplane must reach a sufficiently high speed. The velocity required for the takeoff, the takeoff velocity, depends on several factors, including the weight of the aircraft and t ...
Problem: Here we ponder a few issues related to thermodynamic reversihilityfirrerversihility. Recall that a process is said to be thermodynamically reversible if and only if there exists an e?ecing process. That can retu ...
Qustion: A pendulum is made by tying a 590 g ball to a 45 cm-long string. The pendulum is pulled 22o to one side, then released. Part A: What is the ball's speed at the lowest point of its trajectory? Part B: To what ang ...
Question: A rocket is launched straight up with constant acceleration. Four seconds after liftoff, a bolt falls off the side of the rocket. The bolt hits the ground 6.30s later. What was the rocket's acceleration in m/s^ ...
Question: A parallel-plate air capacitor has a capacitance of 920 pF. The charge on each plate is 2.55 ?C What is the potential difference between the plates? If the charge is kept constant, what will be the potential di ...
Question: One day when you come into physics lab you find several plastic hemispheres floating like boats in a tank of fresh water. Each lab group is challenged to determine the heaviest rock that can be placed in the bo ...
An object falls because of gravity at a rate of -980 cm/s2 (- sign is indicative of a downward direction) for 10. seconds. If it starts from rest (vo = 0) and its position starts from do= 0.0, where is it 10. seconds lat ...
Question: A proton has been accelerated from rest through a potential difference of -1350 V. What is the proton's kinetic energy, in electron volts? What is the proton's kinetic energy, in joules? What is the proton's sp ...
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