1.1. The Springboks are preparing for the Rugby World Cup. During their training, they set up a unique exercise to simulate scrummaging forces. Imagine the following setup: Scrum-halves, denoted as objects A and B, are pulling weights using massless strings that pass over frictionless pulleys, as shown in the Figure 1. The weights of A and B are each 25 N. The coefficients of kinetic friction between object A and the ground, and object B and the incline, are both 0.35. When the system is released, object C, which represents the coach's resistance training weight, moves downward with a constant speed. Figure 1 (a) Find the weight of Block C. [5] (b) If we cut the string between blocks A and B, what will be the acceleration of Block C? [5]
The drawing shows a portion of a larger circuit. Current flows left to right in each resistor. What is the current in the resistor R? Assume R1 = 2.20 Ω, R2 = 4.76 Ω, and I1 = 2.71 A. Number Units
A disabled tanker leaks kerosene (n = 1.20) into the Persian Gulf, creating a large slick on top of the water (n = 1.30). (a) If you are looking straight down from an airplane, while the Sun is overhead, at a region of the slick where its thickness is 459 nm, for which wavelength(s) of visible light is the reflection brightest because of constructive interference? (b) If you are scuba diving directly under this same region of the slick, for which wavelength(s) of visible light is the transmitted intensity strongest? (a) Number Units (b) Number Units