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ap physics ch2-4

# ap physics ch2-4 - Google W|...

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E) 80 km/h 4. A car starts from Hither, goes 50 km in a straight line to Yon, immediately turns around, and returns to Hither. The time for this round trip is 2 hours. The average speed of the car for this round trip is: A) 0 B ) 50 km/h C ) 100 km/h D ) 200 km/h E) cannot be calculated without knowing the acceleration 5. A drag racing car starts from rest at t = 0 and moves along a straight line with velocity given by v = bt 2 , where b is a constant. The expression for the distance traveled by this car from its position at t = 0 is: A) bt 3 B ) bt 3 /3 C ) 4 bt 2 D ) 3 bt 2 E) bt 3/ 2 6. The coordinate of an object is given as a function of time by x = 7 t 3 t 2 , where x is in meters and t is in seconds. Its average velocity over the interval from t = 0 to t = 2 s is: A) 5 m/s B ) –5 m/ s C ) 11 m/ s D ) –11 m/s E) –14.5 m/s 7. The coordinate of an object is given as a function of time by x = 4 t 2 3 t 3 , where x is in meters and t is in seconds. Its average acceleration over the interval from t = 0 to t = 2 s is: A) –4 m/s 2 B ) 4 m/s 2 C ) – 10 m/
s 2 D ) 10 m/s 2 E) –13 m/ s 2 8. Each of four particles move along an x axis. Their coordinates (in meters) as functions of time (in seconds) are given by

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pa rti cl e 1: x ( t ) = 3. 5 2. 7 t 3   pa rti cl e 2 : x ( t ) = 3. 5 + 2. 7 t 3   pa rti cl e 3: x ( t ) = 3. 5 + 2. 7 t 2
A) All four B ) Only 1 C ) Only 2 and 3 D ) Only 2 , 3, and 4 E) None of them 9. Of the following situations, which one is impossible? A) A body having velocity east and acceleration east B ) A body having velocity east and acceleration west C ) A body having zero velocity and non-zero acceleration D ) A body having constant acceleration and variable velocity E) A body having constant velocity and variable acceleration 10 . A particle moves on the x axis. When its acceleration is positive and increasing: A) its velocity must be positive B ) its velocity must be negative C ) it must be slowing down D ) it must be speeding up E) none of the above must be true 11. A particle moves along the x axis according to the equation x = 6 t 2 where x is in meters and t is in seconds. Therefore: A) the acceleration of the particle is 6 m/s 2 B ) t cannot be negative C ) the particle follows a parabolic path D ) each second the velocity of the particle changes by

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9.8 m/s E) none of the above 12. Over a short interval, starting at time t = 0, the coordinate of an automobile in meters is given by x ( t ) = 27 t – 4.0 t 3 , where t is in seconds. The magnitudes of the initial (at t = 0) velocity and acceleration of the auto respectively are: A) 0; 12 m/ s 2 B ) 0; 24 m/ s 2 C ) 27 m/s; 0 D ) 27 m/s; 12 m/s 2 E) 27 m/s; 24 m/s 2 13. At time t = 0 a car has a velocity of 16 m/s. It slows down with an acceleration given by –0.50 t , in m/s 2 for t in seconds. At the end of 4.0 s it has traveled: A) 0 B ) 12 m C ) 14 m D ) 25 m E) 59 m 14. Starting at time t = 0, an object moves along a straight line with
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ap physics ch2-4 - Google W|...

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