Question

N9M.2 and N9B.8

the ground WI time will pass before it returns to he g resistance.) 85 N9B.7 Estimate the terminal speed for a ping-pong bal so whose diameter is 1.5 in. and whose mass is 2.5 g. (For P a sphere, C is roughly 0.5.) N9B.8 A person's terminal speed in air is typically about 60 m/s. If so, what is the value for CA for a falling person? (Assume that m 60 kg.) N9 Modeling N9M.1 Estimate the speed at which the drag on a 150-g steel ball becomes equal to about 1% of its weight. (The density of steel is about 7900 kg/m3, and C for a sphere is about equal to 0.5.) N9M.2 (a) Estimate the drag coefficient for a falling spread- eagled person in air, using data given in section N9.5. (b) Roughly how far has a person fallen by the time the person reaches terminal speed, within 10% or so? (Hint: Look at figure N9.4. Remember that an integral is equal to the area under the curve of the integrand.) N9M.3 Suppose your Frisbee is lodged in a tree. The frisbee is 12 m above your head. (a) How fast would you have to throw a baseball to dis- lodge the Frisbee?

Answer 1

Eiaethe ter minal Speed of a Pin 1 x 2.54) .119 0. 25 x 0 5.98 XO ,25X10-5% 2952, 5 2152.5 19 1-49 s ": 1610.96