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13. Two spherical liquid droplets coalesce to form one large spherical droplet. The initial radius of each droplet is r, the surface tension the liquid is s, and its density […]

12. I place a finger 1/3rd of the way down a guitar string to dampen it, and pluck it. Then I move my finger to 3/4ths of the way down, […]

11. Consider a simple pendulum consisting of a light rod of length l, pivoted at one end with a mass m attached at the other, swinging with an amplitude A […]

10. What is the effective capacitance of this circuit? a. 1.54 “F b. 4.5 “F c. 7.33 “F d. 19 “F The effective capacitance of the circuit is 7.33 μF, […]

9. A motor protein moves cargo in cells by taking forward steps along linear tracks called microtubules. Assume each step has size 8nm and consumes 30 kJ mol-1 of energy […]

8. A small metabolite on average diffuses about 1 nanometre (10-9 m) in a nanosecond (10-9 s). How far from its starting point will this metabolite reach on average in […]

7. The drag force on a particle moving at a speed v in a medium is of the form F=ζv, where the drag coefficient ζ depends on the particle’s shape […]

6. Inside a uniformly charged solid sphere of radius R, at a distance r from the centre, the electric field is proportional to: a. 1/r2 b. 1/r c. r d. […]

5. An object with a mass of 70 kilograms hits a stationary air bag, with velocity 25 m/s at the instant of impact. After 0.25 seconds the object has come […]

4. A wire has resistance 12 ohms. It is bent and its two ends are connected to form a circle. The effective resistance between the two points on any diameter […]