A particle starts from rest at xi = 0 and moves for 10 s with an acceleration of +2.0 cm/s2. For the next 20 s, the acceleration of the particle is ?1.0 cm/s2. What is the position of the particle at the end of this motion?
A. zero
B. +3.0 m
C. ?1.0 m
D. +2.0 m
E. ?3.0 m
Answer: B
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A. 230 keV B. 150 keV C. 300 keV D. 370 keV E. 440 keV
In the apparatus shown in figure Q4.1a, the value displayed by the ammeter is proportional to 
A. The rate at which electrons emerge from the cathode. B. The average kinetic energy of the ejected electrons. C. The maximum kinetic energy of the ejected electrons. D. Both A and C.
A 50-g ball traveling at 25.0 m/s is bounced off a brick wall and rebounds at 20.0 m/s. A high-speed camera records this event. If the ball is in contact with the wall for 3.50 ms, what is the magnitude of the average acceleration of the ball during this time interval?
a. 714 m/s2 c. 6430 m/s2 b. 1430 m/s2 d. 12,900 m/s2
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Answer the following statement true (T) or false (F)