Set 2-1D and 2D motion - Sonia Rahangdale PHY 231 Fall 2006...

Sonia Rahangdale - PHY 231 Fall 2006 1
Set 02 (09/12)
Due date: Tue Sep 12 23:59:00 2006
A boat crossing a 155.0 m wide river is directed so that it
will cross the river as quickly as possible.
The boat has a speed of 5.70 m/s in still water and the river
flows uniformly at 3.10 m/s. Calculate the total distance the
boat will travel to reach the opposite shore.
You are correct. Your receipt is 155-1747
A river is to be crossed by a girl using a row boat.
C
H
A
K
J
F
D
B
Assume that the water has uniform velocity, represented
above by the vector labeled C. The rowing speed of the girl
and a set of possible orientation of her boat are also shown.
Select the direction (i.e., H, or D, or ...) in order to cross the
river in the shortest time. (Notice that the number of tries is
reduced.)
You are correct. Your receipt is 155-2559
For which rowing orientation will the girl land on the oppo-
site shore directly across from her starting position, neither
upstream or downstream. (Notice that the number of tries is
reduced.)
You are correct. Your receipt is 155-2901
Select an answer for each .... below.
Choices: Greater than , Less than , Equal to .
A. Time to row across for B is .... for H.
B. The distance traveled in crossing for F is .... for K.
C. For an observer on shore, the speed of the boat for J is
.... for K.
D. Time to row across for D is .... for B.
E. Time to row across for H is .... for A.
You are correct. Your receipt is 155-2810
A student stands at the edge of a cliff and throws a stone
horizontally over the edge with a speed of 10.1 m/s. The cliff
is 37.6 m above a flat horizontal beach as shown in the figure.