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A small boat is headed for a harbor 30 km directly northwest of its current position when it is suddenly engulfed in heavy fog. The captain maintains a compass bearing of northwest and a speed of 9.8 km/h relative to the water. The fog lifts 3.0 h later and the captain notes that he is now exactly 3.6 km south of the harbor.(a) What was the average speed of the current during those 3.0 h?(b) What would its travel time have been if it had followed a straight course?
A ball is thrown toward a cliff of height h with a speed of 29m/s and an angle of 60? ^\circ above horizontal. It lands on the edge of the cliff 3.5s later. How high is the cliff
The electric starter in an automobile equipped with a 12 V battery draws a current of 90.00 A when in operation. What amount of electric energy has been withdrawn from the battery
A 0.88 kg ball is moving horizontally with a speed of 4.9 m/s when it strikes a vertical wall. find the magnitude of the change in linear momentum of the ball
Jack and John are standing 6m apart from each other playing soccer. Jack kicks the ball to John and John kicks it back immediately. What is the speed of the ball when it's kicked back to Jack
After crossing the finish line, the marathon runner stops, and then performs a celebratory vertical jump. what was the avg. force of the vertical ground reaction force
The length of the mercury column at the ice point and steam point are 5.0 cm and 40.0cm respectively. What is the temperature of the liquid
A force of magnitude 610.0 N stretches a certain spring by 0.230 N from its equilibrium position. How much elastic potential energy is stored in the spring when it is stretched 0.300 m from its equilibrium position
A 80.0cm3 box contains helium at a pressure of 2.30atm and a temperature of 90.0?C. What is the final pressure in each box
An 81-kg person puts on a life jacket, jumps into the water, and floats. The jacket has a volume of 3.1 *10^-2 m^3 and is completely submerged under the water. What is the density of the life jacket
A spherical water drop, 1.80 ?m in diameter, is suspended in calm air owing to a downward-directed atmospheric electric field E = 452 N/C. What is the weight of the drop
Styrofoam has a density of 300 kg/m^3. What is the maximum mass that can hang without sinking from a 40cm diameter Styrofoam sphere in water? Assume the volume of the mass is negligible compared to that of the sphere.
A piano tuner stretches a steel piano wire with a tension of 964N . The wire is 0.400m long and has a mass of 3.60g. What is the frequency of its fundamental mode of vibration
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