6 Questions on Introduction to Physics and Science Mathematics Majors I | PHYS 135, Assignments of Physics

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#1:

v^2 /r = g, v = (rg)1/ #2: In problem 24 in the workbook, an observer inside the boxcar can distinguish between the car being at rest or moving with uniform speed, by reading the spring scale. If the car is at rest or moving with uniform speed, then the mass is also at rest or moving with uniform speed, and no force needs to act on the mass. #3: In problem 24 in the workbook, an observer inside the boxcar can determine the magnitude and direction of the acceleration of the car by reading the spring scale. If the car is accelerating than the mass is also accelerating, a force must be acting on it. The spring will provide this force and it will be stretched. The bigger the acceleration, the more force is needed and the mores stretch is needed. If the car is decelerating, then the force is acting in the opposite direction and the spring will be compressed. #5: When a non-conservative force acts on a system, does the total mechanical energy remain constant? When a conservative force acts on a system, the total mechanical energy remains constant? That is the definition of a conservative force. It conserves the total mechanical energy. #6: Our body muscles exert forces when we lift, push, run jump, and so forth. Are these forces conservative? These forces convert some of the ordered energy into thermal energy. During a workout, you get hot.