GYTE FÄ°Z121 Homework 3-A ...

GYTE FİZ121 Homework 3-AName_____________________________________________Student ID#____________________________________MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.1) For an object in uniform circular motion, its velocity and acceleration vectors are alwaysperpendicular to each other at every point in the path.A) True B) False1)2) What is the maximum distance we can shoot a dart, from ground level, provided our toy dart gungives a maximum initial velocity of 2.78 m/s and air resistance is negligible?A) 0.789 m B) 0.394 m C) 1.39 m D) 1.58 m2)SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question.3) A disk-shaped space station 175 m in diameter spins uniformly about an axisperpendicular to the plane of the disk through its center. How many rpm (rev/min) mustthis disk make so that the acceleration of all points on its rim is g/2?3)MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.4) An object has a position given by r = [2.0 m + (3.00 m/s)t]i^+ [3.0 m - (2.00 m/s2)t2]j^, where allquantities are in SI units. What is the magnitude of the acceleration of the object at time t = 2.00 s?A) 0.00 m/s2 B) 4.00 m/s2 C) 1.00 m/s2 D) 2.00 m/s2 E) 0.522 m/s24)5) A small boat is moving at a velocity of 3.35 m/s when it is accelerated by a river currentperpendicular to the initial direction of motion. If the acceleration of the current is 0.750 m/s2, whatwill be the new velocity of the boat after 33.5 s?A) 640.1 m/s at 7.59° from initial direction of motionB) 25.3 m/s at 7.59° from initial direction of motionC) 25.3 m/s at 82.4° from initial direction of motionD) 640.1 m/s at 82.4° from initial direction of motion5)1

Answer KeyTestname: HOMEWORK3-A1) A2) A3) 2.26 rev/min4) B5) C2

GYTE FİZ121 Homework 3-BName_____________________________________________Student ID#____________________________________MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.1) A monkey is sitting at the top of a tree 20 m above ground level. A person standing on the groundwants to feed the monkey. He uses a bow and arrow to launch the food to the monkey. If the personknows that the monkey is going to drop from the tree at the same instant that the person launchesthe food, how should the person aim the arrow containing the food? Air resistance is small enoughto be ignored.A) He should aim it at the monkey.B) He should aim it above the monkey.C) He should aim it below the monkey.1)2) A cart is moving with a constant horizontal velocity of 5.00 m/s. A small pebble is launched fromthe front of the cart with a velocity of 8.00 m/s at 60.0° above the horizontal as measured relative tothe cart (see figure) and experiences no significant air resistance. Just as the pebble returns to thelevel from which it was launched, its distance from the front of the cart is closest to2)A) 11.3 m. B) 9.19 m. C) 2.83 m. D) 4.60 m. E) 5.66 m.3) An aircraft performs a maneuver called an "aileron roll." During this maneuver, the plane turns likea screw as it maintains a straight flight path, which sets the wings in circular motion. If it takes it 35s to complete the circle and the wingspan of the plane is 11 m, what is the acceleration of the wingtip?A) 0.18 m/s2 B) 0.99 m/s2 C) 1.0 m/s2 D) 5.6 m/s23)SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question.4) A hockey puck slides off the edge of a table at point A with an initial velocity of 20.0 m/sand experiences no air resistance. The height of the tabletop above the ground is 2.00 m.(a) What is the speed (not the velocity) of the puck just before it touches the ground?(b) What is the distance between point A and the point where the puck hits the ground?4)1

5) A projectile is fired from point 0 at the edge of a cliff, with initial velocity components ofν0x = 60 m/s and ν0y =175 m/s, as shown in the figure.The projectile rises and then fallsinto the sea at point P. The time of flight of the projectile is 40.0 s, and it experiences noappreciable air resistance in flight. What is the magnitude of the velocity of the projectile21.0 s after it is fired?5)2

Answer KeyTestname: HOMEWORK3-B1) A2) E3) A4) (a) 21.0 m/s (b) 12.9 m5) 67.4 m/s3

GYTE FİZ121 Homework 3-CName_____________________________________________Student ID#____________________________________MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.1) If you set the cruise control of your car to a certain speed and take a turn, the speed of the car willremain the same. Is the car accelerating?A) No B) Yes1)2) A ball is tied to the end of a cable of negligible mass. The ball is spun in a circle with a radius 2.00m making 7.00 revolutions every 10.0 seconds. What is the magnitude of the acceleration of theball?A) 14.8 m/s2 B) 29.3 m/s2 C) 67.9 m/s2 D) 74.2 m/s2 E) 38.7 m/s22)3) An airplane flies between two points on the ground that are 500 km apart. The destination isdirectly north of the origination of the flight. The plane flies with an air speed of 120 m/s. If aconstant wind blows at 10.0 m/s due west during the flight, what direction must the plane flyrelative to north to arrive at the destination?A) 4.76° west of northB) 4.78° east of northC) 85.2° west of northD) 4.76° east of northE) 4.78° west of north3)4) A cart is moving with a constant horizontal velocity of 5.00 m/s. A small pebble is launched fromthe front of the cart with a velocity of 8.00 m/s at 60.0° above the horizontal as measured relative tothe cart (see figure) and experiences no significant air resistance. Just as the pebble returns to thelevel from which it was launched, its distance from the front of the cart is closest to4)A) 2.83 m. B) 11.3 m. C) 5.66 m. D) 9.19 m. E) 4.60 m.5) Two particles, A and B, are in uniform circular motion about a common center. The acceleration ofparticle A is 8.5 times that of particle B. The period of particle B is 2.0 times the period of particle A.The ratio of the radius of the motion of particle A to that of particle B is closest toA) rA/rB = 4.3.B) rA/rB = 18.C) rA/rB = 0.24.D) rA/rB = 2.1.E) rA/rB = 17.5)1

Answer KeyTestname: HOMEWORK3-C1) B2) E3) B4) C5) D2

Answer KeyTestname: HOMEWORK3-D1) C2) B3) (a) 10 m/s2, 323°(b) 4 m/s4) C5) C2

GYTE FİZ121 Homework 3-EName_____________________________________________Student ID#____________________________________MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.1) Jan and Len throw identical rocks off a tall building at the same time. The ground near the buildingis flat. Jan throws her rock straight downward. Len throws his rock downward and outward suchthat the angle between the initial velocity of the rock and the horizon is 30°. Len throws the rockwith a speed twice that of Jan's rock. If air resistance is negligible, which rock hits the ground first?A) Jan's rock hits first.B) Len's rock hits first.C) They hit at the same time.D) It is impossible to know from the information given.1)SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question.2) A projectile is fired from point 0 at the edge of a cliff, with initial velocity components ofv0x = 60.0 m/s and v0y = 175 m/s, as shown in the figure. The projectile rises and then fallsinto the sea at point P. The time of flight of the projectile is 40.0 s, and it experiences noappreciable air resistance in flight. What is the height of the cliff?2)MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.3) A rock is thrown at a window that is located 18.0 m above the ground. The rock is thrown at anangle of 40.0° above horizontal. The rock is thrown from a height of 2.00 m above the ground witha speed of 30.0 m/s and experiences no appreciable air resistance. If the rock strikes the window onits upward trajectory, from what horizontal distance from the window was it released?A) 53.2 m B) 27.3 m C) 29.8 m D) 48.7 m E) 71.6 m3)4) An object has a position given by r = [2.0 m + (3.00 m/s)t]i^+ [3.0 m - (2.00 m/s2)t2]j^, where allquantities are in SI units. What is the magnitude of the acceleration of the object at time t = 2.00 s?A) 1.00 m/s2 B) 0.00 m/s2 C) 4.00 m/s2 D) 2.00 m/s2 E) 0.522 m/s24)5) A plane flying at 70.0 m/s suddenly stalls. If the acceleration during the stall is 9.8 m/s2 directlydownward, the stall lasts 5.0 s, and the plane was originally climbing at 25° to the horizontal, whatis the velocity after the stall?A) 66 m/s at 17° above the horizontal B) 66 m/s at 17° below the horizontalC) 80 m/s at 37° below the horizontal D) 80 m/s at 37° above the horizontal5)1

Answer KeyTestname: HOMEWORK3-E1) C2) 840 m3) B4) C5) B2

Answer KeyTestname: HOMEWORK3-F1) B2) D3) D4) C5) 840 m2

GYTE FİZ121 Homework 3-GName_____________________________________________Student ID#____________________________________MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.1) A pilot drops a package from a plane flying horizontally at a constant speed. Neglecting airresistance, when the package hits the ground the horizontal location of the plane willA) depend of the speed of the plane when the package was released.B) be in front of the package.C) be behind the package.D) be over the package.1)2) An object has a position given by r = [2.0 m + (3.00 m/s)t]i^+ [3.0 m - (2.00 m/s2)t2]j^, where allquantities are in SI units. What is the magnitude of the acceleration of the object at time t = 2.00 s?A) 4.00 m/s2 B) 1.00 m/s2 C) 2.00 m/s2 D) 0.00 m/s2 E) 0.522 m/s22)3) A hobby rocket reaches a height of 72.3 m and lands 111 m from the launch point with no airresistance. What was the angle of launch?A) 22.6° B) 69.0° C) 44.8° D) 67.4°3)4) A plane flies directly between two cities, A and B, which are separated by 2300 mi. From A to B, theplane flies into a 65 mi/h headwind. On the return trip from B to A, the wind velocity is unchanged.The trip from B to A takes 65 min less than the trip from A to B. What is the airspeed of the plane,assuming it is the same in both directions?A) 530 mi/h B) 610 mi/h C) 480 mi/h D) 400 mi/h4)5) An electrical motor spins at a constant 2857.0 rev/min. If the armature radius is 2.685 cm, what isthe acceleration of the outer edge of the armature?A) 844.4 m/s2 B) 84.40 m/s2 C) 2403 m/s2 D) 241,100 m/s25)1

Answer KeyTestname: HOMEWORK3-G1) D2) A3) B4) A5) C2

Answer KeyTestname: HOMEWORK3-H1) E2) C3) B4) (a) 10 m/s2, 323°(b) 4 m/s5) A2

GYTE FİZ121 Homework 3-IName_____________________________________________Student ID#____________________________________MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.1) If you set the cruise control of your car to a certain speed and take a turn, the speed of the car willremain the same. Is the car accelerating?A) No B) Yes1)2) Two particles, A and B, are in uniform circular motion about a common center. The acceleration ofparticle A is 8.5 times that of particle B. The period of particle B is 2.0 times the period of particle A.The ratio of the radius of the motion of particle A to that of particle B is closest toA) rA/rB = 4.3.B) rA/rB = 18.C) rA/rB = 0.24.D) rA/rB = 17.E) rA/rB = 2.1.2)SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question.3) An airplane is flying at a speed of 2.00 102 m/s in level flight at an altitude of 8.00 102 m.A package is to be dropped from the airplane to land on a target on the ground. Ignore airresistance.(a) At what horizontal distance away from the target should the package be released sothat it lands on the target?(b) In what direction relative to the horizontal will the package be traveling when it hitsthe ground?3)4) A wind farm generator uses a two-bladed propeller (see figure) mounted on a pylon at aheight of 20 m. The length of each propeller blade is 12 m. A small piece from the tip of thepropeller breaks off when the propeller is vertical. At that instant, the period of the motionof the propeller is 1.2 s. The fragment flies off horizontally, falls with negligible airresistance, and strikes the ground at P.(a) How far is point P from the base of the pylon?(b) At what angle with respect to the vertical is the fragment moving just as it strikes theground at P?4)1

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.5) An aircraft performs a maneuver called an "aileron roll." During this maneuver, the plane turns likea screw as it maintains a straight flight path, which sets the wings in circular motion. If it takes it 35s to complete the circle and the wingspan of the plane is 11 m, what is the acceleration of the wingtip?A) 0.99 m/s2 B) 0.18 m/s2 C) 5.6 m/s2 D) 1.0 m/s25)2

Answer KeyTestname: HOMEWORK3-I1) B2) E3) (a) 2.56 km (b) 32.1° below the horizontal4) (a) 160 m (b) 68°5) B3

GYTE FİZ121 Homework 3-JName_____________________________________________Student ID#____________________________________MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.1) Alice and Tom dive from an overhang into the lake below. Tom simply drops straight down fromthe edge, but Alice takes a running start and jumps with an initial horizontal velocity of 25 m/s.Neither person experiences any significant air resistance. Just as they reach the lake belowA) the splashdown speed of Alice is larger than that of Tom.B) the speed of Alice is larger than that of Tom.C) the speed of Alice will always be 25 m/s larger than that of Tom.D) the speed of Tom will always be 9.8 m/s larger than that of Alice.E) they will both have the same speed.1)2) A ball is thrown at a 60.0° angle above the horizontal across level ground. It is thrown from aheight of 2.00 m above the ground with a speed of 20.0 m/s and experiences no appreciable airresistance. The time the ball remains in the air before striking the ground is closest toA) 16.2 s. B) 3.32 s. C) 3.07 s. D) 3.64 s. E) 3.53 s.2)SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question.3) A swimmer heading directly across a river 200 m wide reaches the opposite bank in6 min 40 s, during which time she is swept downstream 480 m.(a) How fast can she swim in still water?(b) What is the speed of the current?3)4) An airplane is flying at a speed of 2.00 102 m/s in level flight at an altitude of 8.00 102 m.A package is to be dropped from the airplane to land on a target on the ground. Ignore airresistance.(a) At what horizontal distance away from the target should the package be released sothat it lands on the target?(b) In what direction relative to the horizontal will the package be traveling when it hitsthe ground?4)MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.5) What is the maximum distance we can shoot a dart, from ground level, provided our toy dart gungives a maximum initial velocity of 2.78 m/s and air resistance is negligible?A) 0.789 m B) 1.39 m C) 1.58 m D) 0.394 m5)1

Answer KeyTestname: HOMEWORK3-J1) B2) D3) (a) 0.50 m/s (b) 1.2 m/s4) (a) 2.56 km (b) 32.1° below the horizontal5) A2

GYTE FİZ121 Homework 3-KName_____________________________________________Student ID#____________________________________MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.1) Shown below are the velocity and acceleration vectors for a person in several different types ofmotion. In which case is the person slowing down and turning to his right?A)1)B)C)D)E)2) An object moves in a circle of radius R at constant speed with a period T. If you want to changeonly the period in order to cut the object's acceleration in half, the new period should beA) T 2. B) 4T. C) T/4. D) T/2. E) T/ 2.2)1

SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question.3) A projectile is fired from point 0 at the edge of a cliff, with initial velocity components ofv0x = 60.0 m/s and v0y = 175 m/s, as shown in the figure. The projectile rises and then fallsinto the sea at point P. The time of flight of the projectile is 40.0 s, and it experiences noappreciable air resistance in flight. What is the height of the cliff?3)MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.4) A boy throws a rock with an initial velocity of 2.15 m/s at 30.0° above the horizontal. If airresistance is negligible, how long does it take for the rock to reach the maximum height of itstrajectory?A) 0.303 s B) 0.194 s C) 0.110 s D) 0.215 s4)5) A rock is thrown at a window that is located 18.0 m above the ground. The rock is thrown at anangle of 40.0° above horizontal. The rock is thrown from a height of 2.00 m above the ground witha speed of 30.0 m/s and experiences no appreciable air resistance. If the rock strikes the window onits upward trajectory, from what horizontal distance from the window was it released?A) 53.2 m B) 27.3 m C) 48.7 m D) 71.6 m E) 29.8 m5)2

Answer KeyTestname: HOMEWORK3-K1) B2) A3) 840 m4) C5) B3