A bolt is dropped from a bridge under construction, falling 82 m to the valley below the bridge. (a) How much time does it take to pas through the last 14% of its fall? What is its speed (b) when it begins that last 14 % of its fall and (c) just before it reaches the ground? (a) Number i (b) Number 37.178 (c) Number 40.09 ! Unit Unit Unit S m/s m/s

Falls resulting in hip fractures are a major cause of injury and even death to the elderly. Typically, the hip's speed at impact is about 2.0m/s. If this can be reduced to 1.3 m/s or less, the hip will usually not fracture. One way to do this is by wearing elastic hip pads. A) if a typical pad is 5.0 cm thick and compresses by 2.0 cm during the impact of a fall, what constant acceleration (in m/s^2 and in g's) does the hip under go to reduce its speed from 2.0 m/s to 1.3 m/s? The acceleration that you found in part "a" may seem very large, but to fully understand its effects on the hip, calculate how long it lasts.

Vector A can be expressed in (i,j,k) notation as 5.0i - 4.0j, and vector B as -7.0i + 2.0j. Determine the value of 3A + 2B in terms of magnitude and angle. The angle can be specified either as a value between 0 and 360 degrees counter- clockwise with respect to the positive x-axis, or as a value between 0 and 90 degrees in the appropriate Cartesian quadrant. Paragraph I + v ... 96% 75°F lılı

The acceleration of an object due to air resistance is a = -bư/m, where v is the %3D speed of the object and m is its mass. What are the SI units of b? O kg/s O kg/s? O kg/m kg/m? O kg - m/s? none of these