Chapter 5
1. (p.139 prob.7)What is the maximum speed with which a 1050-kg car can round a turn of radius 70m on a flat road if the coefficient of friction between tires and road is 0.80? is this result independent of the mass of the car?
2. (p.140 prob.13) A 1000-kg sport car moving at 20m/s crosses the rounded top of a hill (radius = 100m). determine (a) the normal foce on the car, (b) the normal force on the 70-kg driver, and (c) the car speed at which the normal force equals zero.
3. (p.141 prob.31) An exotic finish to massive stars is that of a neutron star, which might have as much as five times the mass of our Sum packed into a sphere about 10km in radius! Estimate the surface gravity on this monster.
4.(p.142 prob.44) What will a spring scale read for the weight of a 58-kg woman in an elevator that moves (a) with constant upward speed of 6.0m/s, (b) with constant downward speed of 6.0m/s, (c) with upward acceleration of 0.33g, (d) with downward acceleration 0.33g, and (e) in free fall?