Ch 3 Supplemental Questions [ Edit ] Exercise m/s. v0h v0v. Ch 3 Supplemental Questions. Part A. Part B. Part C

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1 Ch 3 Suppleental Questions [ Edit ] Overview Suary View Diagnostics View Print View with Answers Ch 3 Suppleental Questions Due: 7:00p on Wednesday, Septeber 28, 2016 To understand how points are awarded, read the Grading Policy for this assignent. Exercise 3.16 Description: On level ground a shell is fired with an initial velocity of v0 at phi above the horizontal and feels no appreciable air resistance. (a) Find the horizontal and vertical coponents of the shell's initial velocity. (b) How long does it... On level ground a shell is fired with an initial velocity of 40.0 resistance. /s at 70.0 above the horizontal and feels no appreciable air Find the horizontal and vertical coponents of the shell's initial velocity. Enter your answers nuerically separated by a coa., =, = 13.7, 37.6 v0h v0v /s How long does it take the shell to reach its highest point? Express your answer using three significant figures. t = = 3.84 Also accepted: = 3.83, = 3.84 Part C Find its axiu height above the ground. Express your answer using three significant figures. 1/11

2 hax = = 72.1 Also accepted: = 72.0, = 72.1 Part D How far fro its firing point does the shell land? Express your answer using three significant figures. l = = 105 Also accepted: = 105, = 105 Part E At its highest point, find the horizontal and vertical coponents of its acceleration. Enter your answers nuerically separated by a coa. ah, av = 0, 9.80 /s 2 Part F At its highest point, find the horizontal and vertical coponents of its velocity. Enter your answers nuerically separated by a coa., =, = 13.7, 0 vh vv /s Exercise 3.19 Description: In a carnival booth, you win a stuffed giraffe if you toss a quarter into a sall dish. The dish is on a shelf above the point where the quarter leaves your hand and is a horizontal distance of 2.1 fro this point (the figure ). If you toss the coin... In a carnival booth, you win a stuffed giraffe if you toss a quarter into a sall dish. The dish is on a shelf above the point where the quarter leaves your hand and is a horizontal distance of 2.1 fro this point (the figure ). If you toss the coin with a velocity of 6.4 at an angle of 60 above the horizontal, the 2/11

3 a velocity of 6.4 /s at an angle of 60 above the horizontal, the coin lands in the dish. You can ignore air resistance. What is the height of the shelf above the point where the quarter leaves your hand? Express your answer using two significant figures. H = 1.5 What is the vertical coponent of the velocity of the quarter just before it lands in the dish? Express your answer using two significant figures. v y = 0.89 /s Exercise 3.25 Description: A jet plane coes in for a downward dive as shown in below. The botto part of the path is a quarter circle with a radius of curvature of 280. According to edical tests, pilots lose consciousness when they pull out of a dive at an upward... A jet plane coes in for a downward dive as shown in below. The botto part of the path is a quarter circle with a radius of curvature of 280. According to edical tests, pilots lose consciousness when they pull out of a dive at an upward acceleration greater than 5.5 g. 3/11

4 At what speed (in /s ) will the pilot black out for this dive? v = 120 /s Also accepted: 123, 123, 120 At what speed (in ph ) will the pilot black out for this dive? v = 270 ph Also accepted: 275, 275, 270 Exercise 3.26 Description: A odel of a helicopter rotor has four blades, each of length L fro the central shaft to the blade tip. The odel is rotated in a wind tunnel at a rotational speed of f. (a) What is the linear speed of the blade tip? (b) What is the radial... A odel of a helicopter rotor has four blades, each of length 3.10 rotated in a wind tunnel at a rotational speed of 530. rev/in fro the central shaft to the blade tip. The odel is What is the linear speed of the blade tip? 4/11

5 v = = 172 /s What is the radial acceleration of the blade tip expressed as a ultiple of the acceleration of gravity, g? a = = 974 g Proble 3.47 Description: In fighting forest fires, airplanes work in support of ground crews by dropping water on the fires. A pilot is practicing by dropping a canister of red dye, hoping to hit a target on the ground below. (a) If the plane is flying in a horizontal path... In fighting forest fires, airplanes work in support of ground crews by dropping water on the fires. A pilot is practicing by dropping a canister of red dye, hoping to hit a target on the ground below. If the plane is flying in a horizontal path at an altitude of 84.0 above the ground and with a speed of 71.0, at what horizontal distance fro the target should the pilot release the canister? Ignore air resistance. Take free fall acceleration to be g. /s x = = 294 Proble 3.65 Description: A 76.0 kg boulder is rolling horizontally at the top of a vertical cliff that is 20 above the surface of a lake, as shown in the figure. The top of the vertical face of a da is located 100 fro the foot of the cliff, with the top of the da... kg A 76.0 boulder is rolling horizontally at the top of a vertical cliff that is 20 above the surface of a lake, as shown in the figure. The top of the vertical face of a da is located 100 fro the foot of the cliff, with the top of the da level with the surface of the water in the lake. A level plain is 25 below the top of the da. 5/11

6 What ust be the iniu speed of the rock just as it leaves the cliff so it will travel to the plain without striking the da? Express your answer using two significant figures. v0x = 49 /s How far fro the foot of the da does the rock hit the plain? Express your answer using two significant figures. L = 50 Proble 3.75 Description: Two soccer players, Mia and Alice, are running as Alice passes the ball to Mia. Mia is running due north with a speed of v_m. The velocity of the ball relative to Mia is v_b in a direction 30.0 degree(s) east of south. (a) What is the agnitude of... Two soccer players, Mia and Alice, are running as Alice passes the ball to Mia. Mia is running due north with a speed of The velocity of the ball relative to Mia is 4.30 in a direction 30.0 east of south. /s /s What is the agnitude of the velocity of the ball relative to the ground? Express your answer to three significant figures and include the appropriate units. 6/11

7 v = = 3.75 What is the direction of the velocity of the ball relative to the ground? Express your answer to three significant figures and include the appropriate units. θ = = 55.0 north of east Proble 3.44 Description: A bird flies in the xy plane with a velocity vector given by v_vec = ( alpha beta t^2)i_unit + gaa t j_unit, with alpha = 2.4 /s, beta = 1.6 /s^3, and gaa = 4.0 /s^2. The positive y direction is vertically upward. At t = 0 the bird is at... A bird flies in the xy plane with a velocity vector given by, with = 2.4, = 1.6, and = 4.0. The positive y direction is vertically upward. At t = 0 the bird is at the origin. /s 2 v = (α β t 2 ) i^ + γtj^ α /s β /s 3 γ Calculate the position vector of the bird as a function of tie. Express your answer in ters of,, and. Write the vector in the for,, where the x and y coponents are separated by a coa. α β γ r(t) r(t) x r(t) y r (t) =, Calculate the acceleration vector of the bird as a function of tie. Express your answer in ters of,, and. Write the vector in the for,, where the x and y coponents are separated by a coa. a (t) =, α β γ a(t) a(t) x a(t) y 7/11

8 Part C What is the bird's altitude (y coordinate) as it flies over x = 0 for the first tie after t = 0? Express your answer using two significant figures. y = 9.0 Proble 3.59 Description: A snowball rolls off a barn roof that slopes downward at an angle of 40 degree(s). The edge of the roof is 14.0 above the ground, and the snowball has a speed of 7.00 /s as it rolls off the roof. Ignore air resistance.assue the coordinate... A snowball rolls off a barn roof that slopes downward at an angle of 40. The edge of the roof is 14.0 and the snowball has a speed of 7.00 /s as it rolls off the roof. Ignore air resistance. Assue the coordinate origin is at the point on the roof where the snowball rolls off and that the positive x direction is to the right and the positive y direction is upwards. above the ground, How far fro the edge of the barn does the snowball strike the ground if it doesn't strike anything else while falling? x = 6.93 Draw x t graphs for the otion in part A. 8/11

9 Part C Draw y t graphs for the otion in part A. Plot points at. t = 0 s, t = 0.4 s, t = 0.8 s, t = 1.0 s, t = 1.3 s 9/11

10 Part D Draw vx t graphs for the otion in part A. Part E Draw vy t graphs for the otion in part A. 10/11

11 Part F A an 1.9 tall is standing 4.0 fro the edge of the barn. Will he be hit by the snowball? Yes No Copyright 2016 Pearson. All rights reserved. Legal Notice Privacy Policy Perissions 11/11