Assignment:
Question 1. Estimate the order of magnitude (exponential power) for the number of grains of salt in a salt shaker.
Question 2. The world record for falling out of an airplane, without a parachute and surviving is 10,000m. If b is 0.13 N(s/m)^2, what is the terminal velocity of this person, assuming she has a mass of 70 kg?
Question 3. Consider pushing a box across a rough surface. The box has a mass of 50.0 kg, and you are applying a force of 49.0 N to move the box with a constant velocity. Draw a picture, identify all the forces acting, define a coordinate system. Then find the magnitude of all the forces acting, and find the coefficient of kinetic friction.
Question 4. Consider a box, with a mass of 10.0 kg, sitting, at rest, on an inclined plane, which makes an angle of 15 degree with respect to the ground. Draw a picture, identify all the forces acting, define a coordinate system. Then find the magnitude of all the forces acting, and find the coefficient of static friction. Finally, assume that you push the box up the incline with a force of 50N. What is the acceleration of the box?