2011年5月IB物理(SL)真题PDF下载-paper1
1. Which of the following contains one fundamental and one derived unit?
2. The current I through a resistor is measured with a digital ammeter to be 0.10 A. The uncertainty in the calculated value of I2 will be
A. 1 %.
B. 2 %.
C. 5 %.
D. 20 %.
3. A skydiver of mass 80 kg falls vertically with a constant speed of 50ms−1. The upward force acting on the skydiver is approximately
A. 0 N.
B. 80 N.
C. 800 N.
D. 4000 N.
4. Joseph runs along a long straight track. The variation of his speed v with time t is shown below.
After 25 seconds Joseph has run 200 m. Which of the following is correct at 25 seconds?
5. A car of mass 1000 kg accelerates on a straight, flat, horizontal road with an acceleration a = 0.3ms−2.The driving force F on the car is opposed by a resistive force of 500 N.
The net (resultant) force on the car is
A. 200 N.
B. 300 N.
C. 500 N.
D. 800 N.
6. A tennis ball of mass m moving horizontally with speed u strikes a vertical tennis racket. The ball bounces back with a horizontal speed v.
The magnitude of the change in momentum of the ball is
A. m (u + v).
B. m (u – v).
C. m (v – u).
D. zero.
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