Clayton State University Department of Natural Sciences. Physics 1111 Quiz 2

Transcription

1 Clayton State University September 8, 2005 Name SOLUTION 1. A new car manufacturer advertises that their car can go "from zero to sixty in 8 s". This is a description of a. Average speed. b. Instantaneous speed. c. Average acceleration. d. Instantaneous acceleration. 2. Suppose that an object is moving with a constant velocity. Make a statement concerning its acceleration. a. The acceleration must be constantly increasing. b. The acceleration must be constantly decreasing. c. The acceleration must be a constant non-zero value. d. The acceleration must be equal to zero. 3. During the first 8 seconds a. C has decreasing velocity, D has increasing velocity. b. C and D both have decreasing velocities. c. C and D have the same velocity.

2 d. C has the same average velocity as D. Clayton State University September 5, 2007 Name SOLUTION 1. If you start from the Art Gallery, travel to the Café, and then to the Bakery, what is your displacement? a km. b km. c km. d km. 2. If you start from the Bakery, travel to the Art Gallery, and then to the Café, in 1.00 hour, what is your average speed? a km/hr. b km/hr. c km/hour. d km/hr. 3. Given the position-versus-time graph for a basket ball player traveling up and down the courting a straight-line path find the instantaneous velocity of the player

3 a. At t = 6.00 s. V = 0 (tangent is horizontal at t = 6.00 s) b. At t = 9.00 s V = rise/run = (-6.00 m)/(4.00 s) = m/s Clayton State University January 24, 2007 Name SOLUTION 1. If you start from the Bakery, travel to the Café, and then to the Art Gallery, what is your displacement? a km. b km.

4 c km. d km. 2. If you start from the Bakery, travel to the Art Gallery, and then to the Café, in 1.00 hour, what is your average speed? a km/hr. b km/hr. c km/hour. d km/hr. 3. Given the position-versus-time graph for a basket ball player traveling up and down the courting a straight-line path find the instantaneous velocity of the player at t = 4.00 s. V = (6.00 m - 0 m)/(4.00 s - 0 s) = 1.50 m/s Clayton State University January 23, 2008 Name SOLUTION

5 1. If you start from the Bakery, travel to the Café, and then to the Art Gallery, what is your displacement? a km. b km. c km. d km. 2. If you start from the Cafe, travel to the Bakery, and then to the Art Gallery, in 1.00 hour, what is your average velocity? a km/hour. b km/hour. c km/hour. d km/hour. 3. Given the position-versus-time graph for a basketball player traveling up and down the courting a straight-line path find the instantaneous velocity of the player a. At t = 2.00 s, V = rise/run = (6.00 m)/(4.00 s) = 1.50 m/s

6 b. At t = 5.00 s, V = rise/run = (-3.00 m)/(2.00 s) = m/s c. At t = 8.00 s. V = 0 (tangent is horizontal at t = 8.00 s) Clayton College & State University May 25, 2004 Name SOLUTION 1. A bird, accelerating from rest at a constant rate, experiences a displacement of 28.0 m in 11.0 seconds. What is its average velocity? a m/s. b m/s. V av = x/t = (28.0 m)/(11.0 s) c m/s. d. zero Given that a = 2.00 m and b = 4.00 m, find:

7 a. The length of side c. c 2 = a 2 + b 2 c 2 = (2.00 m) 2 + (4.00 m) 2 = 20.0 m 2 c = 4.47 m b. Cosine of angle cos(b/c = (4.00 m)/(4.47 m) = c. Tangent of angle tan (a/b = (2.00 m)/(4.00 m) = d. Angle. cos -1 ( 26.5 o Clayton College & State University June 8, 2005 Name SOLUTION 1. A vehicle accelerates from 0 to 30.0 m/s while undergoing a straight line displacement of 45.0 m. What is the vehicle s acceleration if its value may be assumed constant? a. 2.0 m/s 2. V 2 = V a (x x 0 ) a = (V 2 - V 0 2 )/[2(x x 0 )] = [(30.0 m/s) 2 0] / [2 x 45.0 m] = 10.0 m/s 2 b. 5.0 m/s 2.

8 c m/s 2. d m/s Which of the following is equivalent to acceleration? a. Displacement. b. Rate of change of displacement. c. Velocity. d. Rate of change of velocity. 3. A bird acceleration from rest at a constant rate experiences a displacement of 28.0 m in 11.0 s. What is its average velocity? a m/s. V av = x / t = (28.0 m)/ (11.0 s) b m/s c m/s d. 0 m/s. Clayton State University June 6, 2007 Name SOLUTION 1. If you start from the Bakery, travel to the Café, and then to the Art Gallery, what distance did you travel? a km.

9 b km. c km. d km. 2. If you start from the Bakery, travel to the Art Gallery, and then to the Café, in 1.00 hour, what is your average velocity? a km/hr. b km/hr. c km/hour. d km/hr. 3. Given the position-versus-time graph for a basket ball player traveling up and down the courting a straight-line path find the instantaneous velocity of the player a. At t = 2.00 s. V = (6.00 m)/(4.00s) = 1.50 m/s b. At t = 8.00 s V = 0 Clayton State University

10 January 28, 2009 Name SOLUTION 1. If you start from the Bakery, travel to the Art Gallery, and then to the Cafe, what is your displacement? a km. b km. c km. d km. 2. If you start from the Bakery, travel to the Art Gallery, and then to the Café, in 1.00 hour, what is your average velocity? a km/hr. b km/hr. c km/hr. d km/hr. 3. Given that a = 2.50 m and b = 4.50 m, find: a. The length of side c. a 2 + b 2 = c 2 c = (a 2 + b 2 ) 1/2

11 c = ((2.50 m) 2 + (4.50 m) 2 ) 1/2 = 5.15 m b. The sine of angle sin = a/c = (2.50 m)/(5.15 m) = c. The tangent of angle tan = a/b = (2.50 m)/(4.50 m) = d. Angle = tan -1 (0.556) = 29.1 o Clayton State University January 27, 2010 Name _SOLUTION 1. A car moving due north along a straight highway changes its speed from 20.0 m/s to 15.0 m/s. The car s acceleration is directed a. North. b. East. c. South. d. West.

12 2. Suppose that an object is moving with a constant velocity. Make a statement concerning its acceleration. a. The acceleration must be constantly increasing. b. The acceleration must be constantly decreasing. c. The acceleration must be a constant non-zero value. d. The acceleration must be equal to zero. 3. During the first 8 seconds a. A moves to the right, B moves to the left. b. C and B both have negative velocities. c. C moves to the left, A moves to the right. d. A and B are at rest.

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