# Exam. Name. 1) For general projectile motion with no air resistance, the horizontal component of a projectile's velocity A) B) C) D)

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1 Exam Name 1) For general projectile motion with no air resistance, the horizontal component of a projectile's velocity 2) An athlete participates in an interplanetary discus throw competition during an Olympiad that takes place on a planet where the acceleration due to gravity is 9.7 m/s2. He throws the discus with an initial velocity of 20 m/s at an angle of 60 from the vertical. Neglecting air resistance and the height of the discus at the point of release, what is the range of the discus? 32 m 60 m 40 m 21 m 36 m 3) A football kicker is attempting a field goal from 44 m out. The ball is kicked and just clears the lower bar with a time of flight of 2.9 s. If the angle of the kick was 45, what was the initial speed of the ball, assuming no air resistance? 4) A baseball player is running to second base at 5.03 m/s. When he is 4.80 m from the plate he goes into a slide. The coefficient of kinetic friction between the player and the ground is 0.180, and the coefficient of static friction is What is his speed when he reaches the plate? 1) 2) 3) 4) 5) Vector A has a magnitude of 8.0 m and points 30 north of east; vector B has a magnitude of 6.0 m and points 30 west of north; and vector C has a magnitude of 5.0 m and points 30 west of south. The resultant vector A + B + C is given by 6) An athlete competing in the long jump leaves the ground with a speed of 9.14 m/s at an angle of 35 above the horizontal. How long does the athlete stay in the air, assuming no significant air resistance? 0.54 s 1.1 s 2.5 s 0.88 s 0.50 s 5) 6) 1

2 7) A wind farm generator uses a two-bladed propeller mounted on a pylon at a height of 20 m, as shown in the figure. The width of the pylon is very narrow, and the length of each propeller blade is 12 m. A tip of the propeller breaks off just when the propeller is vertical. The fragment flies off horizontally, falls, and strikes the ground at point P with negligible air resistance. Just before the fragment broke off, the propeller was turning uniformly, taking 1.2 s for each rotation. How far is point P from the base of the pylon? 7) 140 m 120 m 160 m 130 m 150 m 8) A ball rolls over the edge of a platform with only a horizontal velocity. The height of the platform is 1.6 m and the horizontal range of the ball from the base of the platform is 20 m. What is the horizontal velocity of the ball just before it touches the ground? Neglect air resistance. 4.9 m/s 9.8 m/s 70 m/s 35 m/s 20 m/s 9) For general projectile motion with no air resistance, the vertical component of a projectile's acceleration 10) The sum of two vectors of fixed magnitudes has its minimum magnitude when the angle between these vectors is ) A projectile is fired from ground level at an angle above the horizontal on an airless planet where g = 10.0 m/s2. The initial x and y components of its velocity are 86.6 m/s and 50.0 m/s respectively. How long after firing does it take before the projectile hits the level ground? 12) A cat leaps to try to catch a bird. If the cat's jump was at 60 off the ground and its initial velocity was 2.74 m/s, what is the highest point of its trajectory, neglecting air resistance? 8) 9) 10) 11) 12) 13) 13) 14) A projectile is fired from ground level with a speed of 150 m/s at an angle 30 above the horizontal on an airless planet where g = 10.0 m/s2. What is the horizontal component of its velocity after 4.0 s? 150 m/s 38 m/s 75 m/s 130 m/s 35 m/s 14) 2

3 15) Vector A has a magnitude of 6.0 m and points 30 north of east. Vector B has a magnitude of 4.0 m and points 30 east of north. The resultant vector A + B is given by 16) A 10.0-kg picture is held in place by two wires, the first one hanging at 50.0 to the left of the vertical and the second one at 45.0 to the right of the vertical. What is the tension in the first wire? 50.8 N 23.8 N 69.6 N 98.1 N 69.4 N 17) When a 45-kg person steps on a scale in an elevator, the scale reads a steady 480 N. Which of the following statements must be true? (There could be more than one correct choice.) 18) In the figure, what does the spring scale read? The pulleys are ideal and the strings and scale are also massless. 15) 16) 17) 18) 19) 19) 20) In a shuffleboard game, the puck slides a total of 12 m on a horizontal surface before coming to rest. If the coefficient of kinetic friction between the puck and board is 0.10, what was the initial speed of the puck? 20) 3

4 21) A horse pulls a cart with force F. As a result of this force the cart accelerates with constant acceleration. The magnitude of the force that the cart exerts on the horse 21) less than the magnitude of F. greater than the magnitude of F. equal to the magnitude of F. 22) 22) 23) An airplane with an airspeed of 120 km/h has a heading of 30 east of north in a wind that is blowing toward the west at 30 km/h. What is the speed of the plane relative to the ground? 24) A pilot drops a package from a plane flying horizontally at a constant speed. Neglecting air resistance, when the package hits the ground the horizontal location of the plane will 23) 24) 25) Four vectors, A, B, C, and D, are shown in the figure. The sum of these four vectors is a vector having magnitude and direction 25) x y x y x 4

5 26) Vector A has a magnitude of 8.0 m and points east, vector B has a magnitude of 6.0 m and points north, and vector C has a magnitude of 5.0 m and points west. The resultant vector A + B + C is given by 27) A person is using a rope to lower a 5.0-N bucket into a well with a constant speed of 2.0 m/s. What is the magnitude of the force exerted by the rope on the bucket? 0.00 N 2.0 N 49 N 5.0 N 10 N 28) A flatbed truck is carrying a 20.0-kg crate along a level road. The coefficient of static friction between the crate and the bed is 0.400, and the coefficient of kinetic friction is What is the maximum acceleration that the truck can have if the crate is to stay in place relative to the truck? 7.84 m/s2 196 m/s m/s m/s m/s2 26) 27) 28) 29) Vector A has a magnitude of 7.0 m and points 30 east of north. Vector B has a magnitude of 5.0 m and points 30 west of south. The resultant vector A + B is given by 30) An object that weighs 75 N is pulled on a horizontal surface by a horizontal pull of 50 N to the right. The friction force on this object is 30 N to the left. What is the acceleration of the object? 0.27 m/s2 11 m/s2 2.6 m/s2 1.1 m/s2 29) 30) 31) A hunter points a rifle horizontally and holds it 3.30 m above the ground. The bullet leaves the barrel at 325 m/s and experiences no significant air resistance. The acceleration due to gravity at this location is 9.80 m/s2. (a) How long does it take for the bullet to strike the ground? (b) How far horizontally does it travel? 32) Two forces are acting on an object as shown in the figure. Assume that all the quantities shown are accurate to three significant figures. 31) 32) (a) What is the magnitude of the resultant force on the object? (b) What is the direction of the resultant force? 5

6 33) The figure shows four vectors, A, B, C, and D. Vectors A and B both have a magnitude of 7.0 cm, and vectors C and D both have a magnitude of 4.0 cm. Find the magnitude and direction of the sum of these four vectors. 33) 34) The driver of a motorboat that can move at 10 m/s in still water wishes to travel directly across a river in which the current flows at 5.0 m/s. (a) At what angle, measured from the upstream direction, should the driver head the boat? (b) How many minutes will it take to cross the river if it is 1.6 km wide at that point? 34) 35) The figure shows two vectors B and C, along with their magnitudes and directions. The vector D is given by D = B - C. 35) (a) What is the magnitude of vector D? (b) What angle does vector D make with the +x-axis? 36) A vector A has components Ax = 12.0 m and Ay = 5.00 m. 36) (a) What is the angle that vector A makes with the +x-axis? (b) What is the magnitude of vector A? 37) Enzo throws a rock horizontally with a speed of 12 m/s from a bridge. It falls for 2.28 s before reaching the water below with no appreciable air resistance. Just as the rock reaches the water, find (a) the horizontal component of its velocity. (b) the speed with which it is moving. 37) 6

7 38) A projectile is thrown upward at 24 with the vertical and returns to the horizontal ground 12.5 s later with no air drag. (a) How fast was it thrown? (b) How far from its original position did it land? (c) How high above its original position did it go? 38) 39) The figure shows three vectors, A, B, and C, along with their magnitudes. Determine the magnitude and direction of the vector given by A + B - C. 39) 40) A 5.0-kg stone is thrown upward at 7.5 m/s at an angle of 51 above the horizontal from the upper edge of a cliff, and it hits the ground 1.5 s later with no air resistance. Find the magnitude of its velocity vector just as it reaches the ground. 40) 41) A bulldozer attempts to drag a log weighing 500 N along the rough horizontal ground. The cable attached to the log makes an angle of 30 above the ground. The coefficient of static friction between the log and the ground is 0.50, and the coefficient of kinetic friction is What minimum tension is required in the cable in order for the log to begin to slide? 41) 42) During a hard stop, a car and its passengers slow down with an acceleration of 8.0 m/s2. What magnitude force does a 50-kg passenger exert on the seat belt in such a stop? 42) 43) A 5.0-kg box slides on the surface on a ramp that rises at 37 above the horizontal. The coefficient of kinetic friction between the box and the surface of the ramp is What are the magnitude and direction of the acceleration of the box if it is sliding (a) up the ramp, (b) down the ramp? 43) 7

8 44) As shown in the figure, two blocks are connected by a very light string, and the upper block is pulled upward by a different string. The masses of the upper and lower blocks are 300 g and 240 g, respectively. The string between the blocks will break if its tension exceeds 3.6 N, and the string that pulls the combination upward will break if its tension exceeds 7.8 N. (a) What is the largest upward acceleration that the blocks can be given without either string breaking? (b) If the upward acceleration is slightly higher than this, which string breaks, the upper one or the lower one? 44) 45) A 150-N crate is being pulled up a perfectly smooth ramp that slopes upward at 15 by a pull that is directed at 30 above the surface of the ramp. What is the magnitude of the pull required to make the crate move up the ramp at a constant velocity of 1.75 m/s? 45) 46) Find the magnitude and direction of the resultant of the three force vectors, A, B, and C, shown in the figure. These vectors have the following magnitudes: A = 5.0 lb, B = 7.9 lb, and C = 8.0 lb. Express the direction of the resultant by specifying the angle it makes with the +x-axis, with counterclockwise angles taken to be positive. 46) 47) A shell is launched with a velocity of 100 m/s at an angle of 30.0 above horizontal from a point on a cliff 50.0 m above a level plain below. How far from the base of the cliff does the shell strike the ground? There is no appreciable air resistance, and g = 9.80 m/s2 at the location of the cliff. 47) 48) A catcher stops a 0.15-kg ball traveling at 40 m/s in a distance of 20 cm. What is the magnitude of the average force that the ball exerts against his glove? 48) 8

9 49) Refer to the figure, which shows four vectors M, N, S, and T. (a) Vector S as expressed in terms of vectors M and N is given by M + N. M - N. N - M. (b) Vector T as expressed in terms of vectors M and N is given by M + N. M - N. N - M. 49) 50) A flatbed truck is carrying an 800-kg load of timber that is not tied down. The maximum friction force between the truck bed and the load is 2400 N. What is the greatest acceleration that the truck can have without losing its load? 50) 9

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