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Unformatted text preview: I. You are a member of a team hired by an architectural ﬁrm to design a wheelchair
accessible entrance to a building. The Americans with Disabilities Act (ADA) requires the
steepness of wheelchair ramps to be less than a 1: 12 ratio of vertical change to horizontal change. a) Decide which of the following ramps meet the ADA recommendation (circle your selection(s)). :
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36m ‘ L 05% b) Calculate the least amount of work and the smallest average force that is required to push WSW—11E a 30 kg chair up to the top of each of the ramps (i—iv).
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up steadily 1:0 re t to 2 m/s. There is a 100 N frictional force that opposes the box’s
motion. For 6 following, assume the box’s elevation is zero when it starts. a) Draw energy kbar charts to describe this motion. Be sure to describe your system, and the
initial and ﬁnal states. glam = @934 HILL, Egg .._. jwﬂAv/ Snag: WQﬁMZ' 1:529 FE' Peace
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‘ WLEMW Mala/immatan mwmwemgéiwiwimw .... i. "Z b) Find the box’s elevation when its speed is 2 m/s?
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c) What angle does the hill make with the horizontal?
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9 : ZOO / 3. A lamp with a mass of 10 kg is hanging from wires as shown. Which of the following is
closest to the magnitude of T3? ‘ SON
w b. 87 N c. 100 N d. 120 N e. need more information
rt. 4. DA 2.0 kg model car rests on an inclined plane that makes an angle of 30° with the horizontal. You push the car with a steadily increasing force in the direction down the
hill until the car begins to move. If the car begins to move when you are pushing with a
force of 7.1 N, what is the approximate coefﬁcient of static friction between the car and
the hill? 7, N /
a. 0.2 7/ ﬂ: M 7:” 0.3 K 1 I é
c. 0.6 $0
d. 0.8 P\ 1.0 5. The masses in the ﬁgure hang across a massless, frictionless
pulley. What is the musion in the rope? F6 a. 0.5 mg b. mg @ 1.33 mg
m e. 1.5 mg .7 X65 6. A 2 kg ball and an 8 kg ball are placed on separate springs, each with the same spring
constant. The springs are compressed by the same distance and released. Which of the following is true about the speeds of the balls as they leave the springs? The 2 kg ball will go 4 times as fast. The 2 kg ball will go twice as fast. Their speeds are equal. The 8 kg ball will go 4 times as fast. The 8 kg ball will go twice as fast. The earth has a radius of appr0ximately 6400 km If a satellite could orbit the earth at a
steady speed just at the earth’s surface, how fast would it have to travel? F: a) 6 km/s Z 1: @14qu
b) 10 km/s c) 28 km/s [k V
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® 8 km/s V] e) 12 km/s Which of the following will remain in the air the LEAST amount of time (neglecting
air resistance)? A marble launched straight up ﬁ'om the ground at 10 m/s 2 U! 71 61+ i ' “Witt 20 QM : {O A marble launched from the ground with a speed of 20 m/s at an
(7/73? angle of30° from the horizontal [/02 if 3 ( , 025 A marble that stays in the air for 1.2 s A marble that is dropped from 10 m above the ground A marble that is launched horizontally from a 10 m high ...
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This note was uploaded on 02/06/2012 for the course PHYSICS 115 taught by Professor Brahmia during the Fall '08 term at Rutgers.
 Fall '08
 Brahmia
 Physics

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