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A 270-m-wide river flows due east at a uniform speed of 4.0 m/s. A boat with a speed of 8.5 m/s relative to the water leaves the south bank pointed in a direction 39o west of north. What is the (a) magnitude and (b) direction of the boat's velocity relative to the ground? Give the direction as the angle of the velocity from due north, positive if to the east and negative if to the west. (c) How long does it take for the boat to cross the river?
You are given a galvanometer with a resistance of 17.3 ? and a full scale deflection current of 8.42 mA. Find the maximum current the ammeter is capable of reading
A29.0 kg wheel, essentially a thin hoopwith radius 1.02 m, is rotating at 280rev/min. It must be brought to a stop in 15.0 s. How much work must be done to stop it
q1. suppose a constant ratio of 13.60 counts per minute per gram of living matter. a sample of a petrified tree was
A 2.50 kg object is attatched to a spring and placed on a horizontal, smooth surface. Find the total energy of the oscillating system
A sprinter can accelerate with constant acceleration for 4.00s before reaching top speed. He can run the 100-meter dash in 10 s.
The atmosphere on Mars is almost all carbon dioxide (CO2), and has a pressure of about 6.9×102 Pa, what is the mass of one cubic meter of the atmosphere
A hypodermic syringe contains a medicine with the density of water. The barrel of the syringe has a cross-sectional area of 2.5 x10-5 m2.
What is the electric potential energy in joules of two electrons separated by 1.33 nm, What would be it be if the separation was doubled
A 851-kg car stopped at an intersection is rear-ended by a 1760-kg truck moving with a speed of 17.5 m/s. find the final speed of both vehicles after the collision
The distance to a point source is increased by a factor of 7. By what factor does the intensity increase
A centrifuge is a device in which a small container of material is rotated at a high speed on a circular path. How many revolutions per minute is the sample making
When a current flows in an aluminum wire of diameter 4.97mm, the drift speed of the conduction electrons is 1.49x10^-4 m/s. What is the electron current in the wire
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