This document contains multiple physics exercises involving work, energy, and motion. Exercise 1 involves analyzing the motion of a falling object subject to drag forces. Exercise 2 looks at the motion of a box sliding down a ramp and jumping to a platform. Exercise 3 analyzes a pulley system with masses of different sizes where one mass experiences drag forces. Exercise 4 considers the motion of a diver jumping off a cliff into the ocean. The exercises require determining changes in kinetic and potential energy, work done by forces, and other energy concepts.
Disha NEET Physics Guide for classes 11 and 12.pdf
Exercise 4.1Check your answers against those in the ANSWER secti.docx
1. Exercise 4.1
Check your answers against those in the ANSWER section.
Listed below are the selling prices (in thousands of dollars) of a
sample of 20 vehicles sold by salespeople employed by Ray
Steele Auto Group in Albuquerque, New Mexico.
a.
Sort the data from low to high.
b.
Draw a dot plot for the data.
26
21
18
22
29
28
28
25
28
24
30
22
35
35
25
35
25
20
37
26
2. Exercise 4.2
Check your answers against those in the ANSWER section.
The Jansen Motor Company has developed a new engine to
further reduce gasoline consumption. The new engine was put in
20 mid-sized cars and the number of miles per gallon recorded
(to the nearest mile per gallon).
Use the Jansen Motor Company data to construct a stem-and-
leaf chart.
29
32
20
30
39
27
28
21
36
20
27
18
32
37
29
30
23
25
19
30
Exercise 4.3
3. Check your answers against those in the ANSWER section.
Listed to the right are the selling prices (in thousands of
dollars) for a sample of 19 lakeside lots in Pinnacle Peak, a
vacation home community in the Blue Ridge mountains.
Determine the following:
a.
the first quartile
b.
the third quartile
c.
the median
d.
Draw a box plot for the data.
86
61
148
81
39
142
140
65
28
85
90
92
4. 25
50
85
85
82
120
137
Exercise 4.4
Check your answers against those in the ANSWER section.
An automobile dealership pays its salespeople a salary plus a
commission on sales. The mean biweekly commission is $1385,
the median $1330, and the standard deviation $75.
a.
Is the distribution of commissions positively skewed, negatively
skewed, or symmetrical?
b.
Compute the coefficient of skewness to verify your answer.
Exercise 4.5
Check your answers against those in the ANSWER section.
The fuel tank capacity in gallons and the cruising range is given
for 6 SUV’s.
a.
5. Develop a scatter diagram for the data.
b.
How would you characterize the relationship between fuel tank
capacity and cruising range?
Capacity in gallons
Cruising range in miles
22
445
21
405
23
410
24
420
7. Use the contingency table in Problem 7 to answer the following:
a. What percent of the males work at home?
b. What percent of the males work at the office?
c. What percent of the employees work at the office?
Phy 2201 page - 1 -
Physics
2201
Homework
III
part
2.
Fall
2015.
Due:
Tuesday
November
17,
2015
20. �
m2 is immersed
in a viscous fluid that exerts a considerable drag force. Starting
from rest the system is set
into motion by releasing
�
m1 which causes this mass to descend while the other rises
(assume the string instantly becomes taut). In what follows
analyze the motion by
defining the “system” as both masses and Earth’s gravity field.
a) Once released each mass travels a distance
�
h1 and somewhere during this interval both
masses reach terminal speed
�
VT . Write out (derive/formulate) a mathematical expression
for the change of the potential energy of the system over this
interval (Using the givens!
Don’t make up numbers or define your own variable names.)
Has the system gained or
lost potential energy? Explain how you know.
b) Write out (derive/formulate) a mathematical expression for
the change in the kinetic
energy of the system over the
�
21. h1 interval (using the givens). Write out an expression for
the work done by the drag force over this interval using the
givens.
c) Following the
�
h1 interval the system moves a distance
�
h2 while the sphere is still
immersed in the fluid. Write out an expression for the work
done by the drag force over
this interval. Can you tell from this expression if the work done
by drag is positive or
negative? (You should.) Which is it and how do you know?
d) If
�
h1 = h2 over which interval does the drag force do more work in
an absolute value
sense? How do you know?
Phy 2201 page - 3 -
4) A 48 kg diver jumps off a cliff (with a running start) into the
ocean. The cliff is 50 m
above the ocean below. Her coach, using a video of the dive,
determines that at a point in
22. flight when she has risen 0.7 m above the cliff, her speed1
(center of mass) is 0.5 m/s.
Frictional effects such as drag are negligible.
Formulate your solution using the diver and Earth’s gravity
field as a system. Gravity
does not do work on this system. It’s effects are captured in
changes in potential energy.
a) How much kinetic energy did she have at takeoff? What was
her speed?
b) How much kinetic energy will she have as she splashes into
the ocean?
c) What minimum amount of chemical energy needed to be
consumed within the diver’s
body in order for her to walk to the cliff, from ocean level, and
then take off (jump)?
Explain how you know.
1 Includes both x and y velocity components. This is not the
highest point in the jump.