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BAED-PHYC2121 General Physics 1
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Superguy is flying at treetop level near Paris when he sees the Eiffel Tower elevator start to fall (the cable snapped). His x-ray vision tells him Lois LaTour is inside. If Superguy is 1.07 km away from the tower, and the elevator falls from a height of 210 m, how long does Superguy have to save Lois, and what must be his average speed?
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A jet airliner moving at 550 mph due east moves into a region where the wind is blowing at 150 mph in a direction 30° north of east. What is the new velocity and direction of the aircraft?
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3.1 Motion of a Spacecraft in Interstellar Space
A drag racer starts from rest and accelerates at 8.0 m/s2 for the entire distance of 400 m (1/4 mile). What is the speed of the race car at the end of the run?0%
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4.4 Further Applications of Newton's Laws
A 2000-kg sailboat experiences an eastward force of 2000 N by the ocean tide and a wind force against its sails with magnitude of 6000 N directed toward the northwest (45° N of W). What is the magnitude of the resultant acceleration?0%
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Note the expression: y = A/x3. Which statement is most consistent with this expression?
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There are other ways of expressing uncertainty besides significant figures. For example, suppose a quantity is known to have a value between 20.4 and 20.0, and our best estimate of the value is midrange at 20.2. We could write the number as 20.2 +/− 0.2 and say that the number has a 1% uncertainty. We would also say it has 3 significant figures. If we square a number with 1% uncertainty (i.e., 2 parts in about 200) and 3 significant figures, what results?
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A stone is thrown with an initial speed of 12.1 m/s at an angle of 58° above the horizontal from the top of a 36 m building. If g = 9.8 m/s2 and air resistance is negligible, then what is the magnitude of the horizontal component of velocity as the rock strikes the ground?
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