1. When measuring the period of a simple pendulum, why did we measure the time o

Question

1. When measuring the period of a simple pendulum, why did we measure the time over ten cycle and the divide by ten?

a. the period is the time it takes to complete ten cycles

b. to allow time for the pendulum to reach full speed

c. ten is the lowest harmonic number

d. to obtain a more precise measurement

2. Why did we swing the pendulum at only small angles from the vertical?

            a. The Pendulum only undergoes simple harmonic motion at small angles

            b. it is too difficult to measure the period at larger angles

            c. to minimize the effect of air resistance

            d. to reduce the uncertainty

3. the spring constants for various springs are give below. Which spring will exert the weakest force if stretched 5cm ?

            a. 3.2 N/m         b. 0.487 N/m     c. 7.8 N/m         d. 6.2 N/m

4.the oscillating mass on a spring will have its greatest acceleration at

            a. the midpoint between and highest height

            b. both amplitude position

            c. its position closest to the ground

            d. its position farthest from the ground

5. A mass is hanging from a vertical spring. You pull the mass 5.0 cm down from its equilibrium position and measure its period to be 0.8 seconds. If you were to pull the mass down 10.0 cm from its equilibrium position, what would expect for the period measurement?

            a. period less than 0.8 s

            b. period equal to 0.8s

            c. period more than 0.8 s

            d. not enough information

6. With two resistors in series that are connected to a 9 V battery. The current in one of the resistors in 3.0 mA. What is the current in the other resistor? _______________________

7. Calculate the speed of a wave traveling along a strong with a density 2.00 X 10-3 kg, a tension of 0.853N._____________

8. A string fixed at both ends produces a one loop standing wave if vibrated at 20 Hz. At what frequency would this same string produce a three standing wave? _____________

Explanation / Answer

1.   d. to obtain a more precise measurement

2. a. The Pendulum only undergoes simple harmonic motion at small angles

3. b. 0.487 N/m   

4. b. both amplitude position

5. b. period equal to 0.8s

6. 3 mA

7. 20.65 m/sec
8. 60 Hz

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