Answered: A 39.5 kg mg child on a sled slides…

Glencoe Physics: Principles and Problems, Student Edition

1st Edition

ISBN:9780078807213

Author:Paul W. Zitzewitz

Publisher:Paul W. Zitzewitz

Chapter6: Motion In Two Dimensions

Section6.3: Relative Velocity

Problem 27PP

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A hare and a tortoise compete in a race over a straight course 1.00 km long. The tortoise crawls at a speed of 0.200 m/s toward the finish line. The hare runs at a speed of 8.00 m/s toward the finish line for 0.800 km and then stops to tease the slow-moving tortoise as the tortoise eventually passes by. The hare waits for a while after the tortoise passes and then runs toward the finish line again at 8.00 m/s. Both the hare and the tortoise cross the finish line at the exact same instant. Assume both animals, when moving, move steadily at their respective speeds. (a) How far is the tortoise from the finish line when the hare resumes the race? (b) For how long in time was the hare stationary?
Review. Prove that one solution of the equation 2.00x43.00x3+5.00x=70.0 is x = 2.22.
The small archerfish (length 20 to 25 cm) lives in brackish waters of Southeast Asia from India to the Philippines. This aptly named creature captures its prey by shooting a stream of water drops at an insect, either flying or at rest. The bug falls into the water and the fish gobbles it up. The archerfish has high accuracy at distances of 1.2 m to 1.5 m, and it sometimes makes hits at distances up to 3.5 m. A groove in the roof of its mouth, along with a curled tongue, forms a tube that enables the fish to impart high velocity to the water in its mouth when it suddenly closes its gill flaps. Suppose the archerfish shoots at a target that is 2.00 m away, measured along a line at an angle of 30.0 above the horizontal. With what velocity must the water stream be launched if it is not to drop more than 3.00 cm vertically on its path to the target?
A group of college students eager to get to Florida on a spring break drove the 750-mi trip with only minimum stops. They computed their average speed for the trip to be 55.0 mi/h. How many hours did the trip take?
A paper in the journal Current Biology tells of some jellyfish-like animals that attack their prey by launching stinging cells in one of the animal kingdoms fastest movements. High-speed photography showed the cells were accelerated from rest for 700. ns at 5.30 107 m/s2. Calculate (a) the maximum speed reached by the cells and (b) the distance traveled during the acceleration.
An average person sneezes about three times per day. Estimate the worldwide number of sneezes happening in a time interval approximately equal to one sneeze.
A train is 350 meters long goes through a tunnel that is 2.52 kilometers long how long does the train take a pass to the tunnel if it is traveling at a speed of 6 meters per second
A stone is dropped from the top of a cliff. A precision equipment was used in order to measure the time for the sound of a splash to return. Calculate the distance to the water if the speed of sound is 335 m/s and sound returns in 3 s
A 20,744kg railroad freight car travels on a level track at a speed of 6.1m/s. It collided and coupled with a 28,638kg second car initially at rest and with brakes released. What is the speed of the two cars after collision to one decimal place?
A typical reaction time to get your foot on the brake in your car is 0.2 seconds. If you are traveling at a speed of 47 kph, what distance will your car travel during this reaction time? Express your answers in meters.
A cat chases a mouse across a 1.0 m high table. the mouse steps out of the way, and the cat slides off the table and strikes the floor 2.2 m from the edge of the table. What was the cat's speed when it slid off the table?
A 30.1 kg child on a sled slides down a hill, reaching a speed of 6.65 m/s. How high was the hill (in m)?

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A 39.5 kg mg child on a sled slides down a hill reaching a speed of 8.92 meters per second how high was the hill in meters