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physics 115 exam

# physics 115 exam - I You are a member of a team hired by an...

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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)). : i l 4 (Q. ('7 V (1“ mi: W 16m We , . __,¢.__\(-i{ 4m ‘1 *t' 49m 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). Murat / 2% Wei 1 \J'gz': [(ML fr We : 4x 44mg “1’ 8551; g 30.12 \$5 Hpéx LL03 % A '~! c) Explain, in terms of work and force, the purpose of wheelchair accessibility ramps. 72/? mg a: tat/522 mm Weaser 6W3 I5 w ﬂew my Moo/v7 or’ won W A NHt‘E‘lCuM/P, f/A/CE N" F28, 7123‘ 5655 {yng AWN #49 r) urea, 47 my %{W my week (6%)” WOMN‘E, W 2 dug 3 ho/ a A wage/u *"tS 73 (‘50 5527,06 d? W“ W” 11. You push a 20 kg box up a hill. You exert a force of 200 N for 6 m and the box speeds 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 6 am as WW ﬂew” ‘ WLEMW Mala/immatan mwmwemgéiwiwimw .... i. "Z b) Find the box’s elevation when its speed is 2 m/s? WMIW FL “\$371. " “'2:va +« nah lZCOT‘ @OC?’ ‘ ‘2'“ (Zoyngg e (zoﬁcci, 3%{M boa? Aim/4' Hegel! W: W h I 3m / (9' We » 5 c) What angle does the hill make with the horizontal? Z (0 K I 3 W9 : 1i 5W = 0.3” 9: 30° 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 .2 L .1 F'— ® 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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