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A boat can travel 15 km/hr in still water you want to cross a river 1 km wide by traveling east to west. The river is flowing 5 km/hr to the south.
A) If the boat driver wishes to land the boat at a dock on the other side of the river directly oppistie his starting position, answer the following:
1) Which direction should the boat driver point his boat.
2) Find the vector exspression for the boats velocity reletive to the earth.
3) How long does it take him to cross the river.
A hard-thrown tennis ball is moving horizontally when it bangs into a vertical concrete wall at perpendicular incidence. What are the directions of its velocity and acceleration just before hitting the wall
The earth spins in the same sense as it orbits around the sun. find the earth's spin angular velocity about its internal axis
The two surfaces of a plastic converging lens have equal radii of curvature of 25.0cm, Calculate the index of refraction of the plastic
Assume that there is a very beautiful ornate crown, supposedly made of solid gold, how would you determine its density
A 206kg rock sits in full sunlight on the edge of a cliff 5m high. The temperature of the rock is 30.2 degrees celcius. what is the final temperature of the rock-water system
Two people stand 5.20 m apart and 4.00 m away from a large plane mirror in a dark room. At what angle of incidence should one of them shine a flashlight on the mirror so that the reflected beam straight strikes the other person.
A person uses corrective glasses of power -8.5 D. If the glasses are worn 2.0 cm from the eye, what is the person's far point without glasses
How many helium-filled balloons would it take to lift a person, Assume the person has a mass of 80kg and that each helium-filled balloon is spherical with a diameter of 33 cm
An object, at the top of a very tall building, is released from rest and falls freely due to gravity. Neglect air resistance and compute distance covered by the object between times t1 = 5.5 s and t2 = 7.9 s after it is released.
A medium sized home may have a roof with a surface area of 120m2. Find the total amount of solar energy incident on the roof in one day
Each plate of a parallel-plate capacitor is a square of side 0.0339 m and the plates are separated by 0.407 × 10-3 m. Find the electric field strength inside the capacitor
On a horizontal, frictionless table, an open-topped 5.50kg box is attached to an ideal horizontal spring having force constant 390N/m. Find the period of the resulting motion of the box
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