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A boat crossing a 143.0 m wide river is directed so that it will cross the river as quickly as possible. The boat has a speed of 5.70 m/s in still water and the river flows uniformly at 5.10 m/s. Calculate the total distance the boat will travel to reach the opposite shore.
A 100 W lightbulb produces 4.0 W of visible light. What is the light intensity on a wall 3.0 m away from the lightbulb
A 2.0-kg object is attached to a spring (k=55.6 N/m) that hangs vertically from the ceiling. obtain the magnitude of the maximum acceleration of the object
What would be the equilibrium temperature when a 227 block of copper at 265 is placed in a 155 aluminium calorimeter cup containing 844 of water at 14.50.
A kayaker paddles with a power output of 60.0 W to maintain a steady speed of 1.40 m/s, by what factor does the kayaker's speed change
An iron rod has a length of 0.5 m and a cross-sectional area of 6.20 10-4 m2. One end of the rod is in contact with boiling water, what is the mass of ice per second that melts
A force vector has a magnitude of 579 newtons and points at an angle 41 Degrees of below the positive x axis. What are (a) the x scalar component and (b) the y scalar component of the vector
A baseball with a mass of 0.14 kg is moving at +35 m/s. Calculate the momentum of the baseball
Two spheres are cut from a certain uniform rock. One has radius 4.30cm. The mass of the other is six times greater. Find its radius.
In a photoelectric experiment, light with a wavelength of 250 nm hits a certain material. When a negative potential of 0.48 volt is applied there is no more current while a saturation current Is is recorded at positive voltages.
water has a mass per mole of 18.0 g/mol, and each water molecule (H20) has 10 electrons. what is the net charge of all these electrons
The starship Enterprise speeds by you at a speed of 0.960c. It is measure in your frame to be 100 m long. What will be it's length at rest
Two free particles (that is, free to move) with charges +q and +4q are a distance L apart. A third charge is placed so that the entire system is in ?quilibrium. Find out the location, magnitude, and sign of the third charge.
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