A 50.0 g ball traveling at 25.0 m/s bounces off a brickwall and rebounds at 22.0 m/s. A high speed camera records8this event. If the ball is in contact with the wall for 3.50 ms,what is the magnitude of the average acceleration of the ballduring this time interval?(a) 1.34 × 104 m/s2(b) 8.57 × 102 m/s2(c) −8.57 × 102 m/s2(d) −1.34 × 104 m/s2(e) 6.7 × 104 m/s2Q21: A ball is thrown directly downward with an initialspeed of 8.00 m/s from a height of 30.0 m. After what timeinterval does it strike the ground?(a) 0.27 s (b) 3.75 s (c) 2.40 s (d) 1.79 s (e) 2.70 sQ22: A student throws a heavy red ball horizontally froma balcony of a tall building with an initial speed vi. At thesame time, a second student drops a lighter blue ball from thebalcony. Neglecting air resistance, which statement is true?(a) The blue ball reaches the ground first.(b) The balls reach the ground at the same instant.(c) The red ball reaches the ground first.(d) Both balls hit the ground with the same speed.(e) None of statements (a) through (d) is true9Q23: A projectile is launched on the Earth with a certaininitial velocity and moves without air resistance. Anotherprojectile is launched with the same initial velocity on theMoon, where the acceleration due to gravity is onesixth aslarge. How does the range of the projectile on the Mooncompare with that of the projectile on the Earth?(a) It is one-sixth as large.(b) It is 36 times larger.(c) It is 6 times larger.(d) It is √6 times larger.(e) It is the same.Q24: Figure 1 shows a bird’s-eye view of a car going arounda highway curve. As the car moves from point 1 to point 2,its speed doubles. Which of the vectors (a) through (e) showsthe direction of the car’s average acceleration between thesetwo points?Figure 1:10Q25: An electron in a cathode-ray tube accelerates uni-formly from 2.00 × 104 m/s to 6.00 × 106 m/s over 1.50 cm.In what time interval does the electron travel this 1.50 cm?(a) 2.5 ns (b) 49.8 ns (c) 4.98 ns (d) 0.49 ns (e) 7.5 nsQ26: An object starts from rest and accelerates as shown inFigure 2. Determine the particle’s speed at t = 10.0 s and att = 20.0 s.Figure 2:(a) 20 m/s (b) 5 m/s (c) −60 m/s (d) 40 m/s (e) −5 m/sQ27: A particle moves according to the equation; x = 10t2,where x is in meters and t is in seconds. Find the velocity forthe time interval from 2.0 s to 2.1 s.(a) 0.1 m/s (b) 42 m/s (c) 44.1 m/s (d) 40 m/s (e)2.0 m/s11Section B:Use the following short eassays to answer theQuestions that follow them.You throw a ball vertically upward so that it leaves theground with velocity 15.00 m/s.Q28: What is its velocity when it reaches its maximum al-titude?(a) The ball increases the speed at its maximum altitude.(b) The ball velocity is zero at its maximum altitude.(c) The ball velocity is constat at all times.(d) The ball acceleration chnages at its maximum altitude.(e) The ball velocity is constat at all times.Q29: What is its acceleration at this point?(a) Its acceleration; a < 9.80 m/s.(b) Its acceleration; a > 9.80 m/s.(c) Its acceleration; a = −9.80 m/s.(d) Its acceleration; a = 9.80 m/s.(e) None of the above.12The position versus time for a certain particle movingalong the x-axis is shown in Figure 1. Find the averagevelocity in the time intervals;Figure 3:Q30: From 0 s to 2 s;(a) Average velocity is; v = 5.0 m/s.(b) Average velocity is; v = −5.0 m/s.(c) Average velocity is; v = 10.0 m/s.(d) Average velocity is; v = 2.0 m/s.(e) Average velocity is; v = 4.0 m/s.Q31: From 2 s to 4 s;(
Question
A 50.0 g ball traveling at 25.0 m/s bounces off a brickwall and rebounds at 22.0 m/s. A high speed camera records8this event. If the ball is in contact with the wall for 3.50 ms,what is the magnitude of the average acceleration of the ballduring this time interval?(a) 1.34 × 104 m/s2(b) 8.57 × 102 m/s2(c) −8.57 × 102 m/s2(d) −1.34 × 104 m/s2(e) 6.7 × 104 m/s2Q21: A ball is thrown directly downward with an initialspeed of 8.00 m/s from a height of 30.0 m. After what timeinterval does it strike the ground?(a) 0.27 s (b) 3.75 s (c) 2.40 s (d) 1.79 s (e) 2.70 sQ22: A student throws a heavy red ball horizontally froma balcony of a tall building with an initial speed vi. At thesame time, a second student drops a lighter blue ball from thebalcony. Neglecting air resistance, which statement is true?(a) The blue ball reaches the ground first.(b) The balls reach the ground at the same instant.(c) The red ball reaches the ground first.(d) Both balls hit the ground with the same speed.(e) None of statements (a) through (d) is true9Q23: A projectile is launched on the Earth with a certaininitial velocity and moves without air resistance. Anotherprojectile is launched with the same initial velocity on theMoon, where the acceleration due to gravity is onesixth aslarge. How does the range of the projectile on the Mooncompare with that of the projectile on the Earth?(a) It is one-sixth as large.(b) It is 36 times larger.(c) It is 6 times larger.(d) It is √6 times larger.(e) It is the same.Q24: Figure 1 shows a bird’s-eye view of a car going arounda highway curve. As the car moves from point 1 to point 2,its speed doubles. Which of the vectors (a) through (e) showsthe direction of the car’s average acceleration between thesetwo points?Figure 1:10Q25: An electron in a cathode-ray tube accelerates uni-formly from 2.00 × 104 m/s to 6.00 × 106 m/s over 1.50 cm.In what time interval does the electron travel this 1.50 cm?(a) 2.5 ns (b) 49.8 ns (c) 4.98 ns (d) 0.49 ns (e) 7.5 nsQ26: An object starts from rest and accelerates as shown inFigure 2. Determine the particle’s speed at t = 10.0 s and att = 20.0 s.Figure 2:(a) 20 m/s (b) 5 m/s (c) −60 m/s (d) 40 m/s (e) −5 m/sQ27: A particle moves according to the equation; x = 10t2,where x is in meters and t is in seconds. Find the velocity forthe time interval from 2.0 s to 2.1 s.(a) 0.1 m/s (b) 42 m/s (c) 44.1 m/s (d) 40 m/s (e)2.0 m/s11Section B:Use the following short eassays to answer theQuestions that follow them.You throw a ball vertically upward so that it leaves theground with velocity 15.00 m/s.Q28: What is its velocity when it reaches its maximum al-titude?(a) The ball increases the speed at its maximum altitude.(b) The ball velocity is zero at its maximum altitude.(c) The ball velocity is constat at all times.(d) The ball acceleration chnages at its maximum altitude.(e) The ball velocity is constat at all times.Q29: What is its acceleration at this point?(a) Its acceleration; a < 9.80 m/s.(b) Its acceleration; a > 9.80 m/s.(c) Its acceleration; a = −9.80 m/s.(d) Its acceleration; a = 9.80 m/s.(e) None of the above.12The position versus time for a certain particle movingalong the x-axis is shown in Figure 1. Find the averagevelocity in the time intervals;Figure 3:Q30: From 0 s to 2 s;(a) Average velocity is; v = 5.0 m/s.(b) Average velocity is; v = −5.0 m/s.(c) Average velocity is; v = 10.0 m/s.(d) Average velocity is; v = 2.0 m/s.(e) Average velocity is; v = 4.0 m/s.Q31: From 2 s to 4 s;(
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