About Golf Balls

LynnShin asked:


Please don’t freak out by how many questions there are, just read through. If you can only answer one, that’s great!! (:

And if you feel like it, explain how to get the answer??

1.) A swimmer is heading directly across a river 200m wide reaches the opposite bank in 6min 40s. She is swept downstream 300m. How fast can she swim in still water?

2.)The driver of a motorboat that that can move at 10m/s wishes to travel directly across strait in which the current flows at 5m/s. (a) At what angle upstream should the driver head the boat? (b) How long will it take to cross a distance of 1.6km?

3.) Your motorboat can move at 30km/h in still water. How much time will it take you to move 12km upstream, in a river flowing at 6km/h?

4.)Bullet G is dropped, from rest, at the same time that another bullet H is fired horizontally from a rifle. If both bullets leave the same height above the ground, then…
a. G hits before H
b. both at the same time
c. H hits before G
d. not enough info

5.) Suppose that several projectiles are fired upward. Which one will be in the air longest?
a. farthest range, R
b. highest max elevation, h
c. one which has product of Rth is max
d. greatest initial velocity

6.) A golf ball is hit w/initial velocity of 60m/s at an angle of 130 degrees above the horizontal. How far does it travel?

7.) A plane flying horizontally at a speed of 50m/s and at an elevation of 160m drops a package of supplies. Two seconds later it drops a second package. How far apart will the two packages land on the ground?

8.) At what angle should a water-gun be aimed in order for the water to land with the greatest horizontal range? O or 30 or 45 or 90?

9.) A girl throws a stone straight down from a bridge. The stone leaves her hand w/velocity of 8m/s at height of 12m above the water. How much time does it take for the stone to hit the water?

10.) A mortar shell is launched with a velocity of 100m/s at an angle of 30 degrees above horizontal from a point on a cliff 50m above a level plain below. How far from the base of the cliff does the mortar shell strike the ground?

11.) An Olympic athlete throw a javelin at 4 different angles above the horizontal, each with the same speed: 30, 40, 60, & 80 degrees. Which 2 throws cause the javelin to land the same distance?

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