Exam I Practice questions
1) A motorist makes a trip of 180 miles. For the first 90 miles she drives at a constant speed of 30 mph. At what constant
speed must she drive the remaining distance if her average speed for the total trip is to be 40 mph?
2) A
General Physics: Introductory Course in Mechanics, Heat, and Sound (Uses College Algebra)
PHYSICS 110

Spring 2016
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General Physics: Introductory Course in Mechanics, Heat, and Sound (Uses College Algebra)
PHYSICS 110

Spring 2016
Solutions for Exam 2
Problem #1:
Using the XY coordinate system drawn on the image of the four mass system, we can calculate two moments of inertia; one
about a vertical axis which the system can rotate (rotation around the yaxis) and one about a horizo
General Physics: Introductory Course in Mechanics, Heat, and Sound (Uses College Algebra)
PHYSICS 110

Spring 2016
Problem #1:
PART A: Calculate the centerofmass of the array of point masses indicated below. Use the XY coordinate system indicated on
the diagram. The smaller two masses are m=2 kg each and the two largest masses are M=3 kg. The four masses are connect
General Physics: Introductory Course in Mechanics, Heat, and Sound (Uses College Algebra)
PHYSICS 110

Fall 2013
Aim: ?
Homework
Read pg. 202205
Do Questions on Moodle
Do Now
An argon ion laser emits light at 489nm.
What is the frequency of this radiation? Is this
emission on the visible spectrum? If yes, what
color is it?
Blackbody Radiation
The pivotal research
General Physics: Introductory Course in Mechanics, Heat, and Sound (Uses College Algebra)
PHYSICS 110

Fall 2013
Aim: ?
Homework
Read pg. 163168
Do Questions on Moodle
Do Now
A reaction in a closed cylinder absorbed
400 J of energy from its surroundings. If 1800 J of
energy was required to push the cylinder up, what
is the change in the systems internal energy?
The
General Physics: Introductory Course in Mechanics, Heat, and Sound (Uses College Algebra)
PHYSICS 110

Fall 2013
Aim: ?
Homework
Read pg. 169174
Do Questions on Moodle
Do Now
Given the following thermochemical equation:
2KClO3(s) 2KCl(s) + 3O2(g) + 89.4 kJ
If 55kJ of energy was released how much potassium
chlorate was initially present in the reaction?
Calculating
General Physics: Introductory Course in Mechanics, Heat, and Sound (Uses College Algebra)
PHYSICS 110

Fall 2013
Aim: ?
Homework
Read pg. 158162
Do Questions on Moodle
Do Now
What are the two modes by which energy
can be transferred to and from a system?
Total Energy Is Conserved
In the previous lesson, we learned about
systems and surroundings
We also learned th
General Physics: Introductory Course in Mechanics, Heat, and Sound (Uses College Algebra)
PHYSICS 110

Fall 2013
Aim: ?
Homework
Read pg. 199202
Do Questions on Moodle
Do Now
Name the scientist given credit for the
discovery of the
a) proton
b) electron
c) neutron
Our Journey
In the previous lesson, we began our journey
into understanding the structure of the atom
General Physics: Introductory Course in Mechanics, Heat, and Sound (Uses College Algebra)
PHYSICS 110

Fall 2013
1 A car moves along a straight horizontal path for 20 seconds, as follows : The first 10 seconds at
constant velocity v, and then it goes from v to 2v for the next 10 seconds. If the total distance travelled
during these 20 seconds is 200m , what is the v
General Physics: Introductory Course in Mechanics, Heat, and Sound (Uses College Algebra)
PHYSICS 110

Fall 2013
1. The driver of a car wants to slow his car from its current velocity v=30 m/s, to under the
limit speed of 15 m/s and within a distance of 100m. The car is travelling on a horizontal
road.
What is the minimum acceleration needed?
What is the required co
General Physics: Introductory Course in Mechanics, Heat, and Sound (Uses College Algebra)
PHYSICS 110

Spring 2016
PHY215 Sec 123 Extra Credit (Spring 2016)
Science Department, Professor Chiaki Yanagisawa
Name_
Solve up to 5 problems. Submit your answers and solutions on Tuesday, May 3 in the class. No
delayed submission will be accepted.
1. Sound waves are produced b
OKPARE 1
NEWTONS
LAW OF
MOTIONS
Its Applications in the World Around Us
Daniel Okpare
PHYSICS 11
OKPARE 2
Daniel Okpare
Dr. Jalil Moghaddasi
PHY 11
Newtons Law of Motions: Its Applications in the World Around Us
Sir Isaac Newton was revolutionary during t
Homework 2
(35) V is a vector 24.8 units in magnitude and points at an angle of 23.4
above the negative xaxis. (a) Sketch this vector. (b) Calculate Vx and Vy .
(c) Use Vx and Vy to obtain (again) the magnitude and direction of V . [Note:
Part (c) is a
Homework 7
(7  10) An object at rest is suddenly broken apart into two fragments by
an explosion. One fragment acquires twice the kinetic energy of the other.
What is the ratio of their masses?
Solution
Momentum will be conserved in one dimension in the
Homework 7
(8  5) The platter of the hard drive of a computer rotates at 7200 rpm (rpm
= revolutions per minute = rev/min).
Solution
(a) What is the angular velocity (rad/s) of the platter?
7200 rev
2 rad
1 min
!=
= 754 rad/s.
min
rev
60 s
(b) If the rea
Homework 5
(69) A box of mass 4.0 kg is accelerated from rest by a force across a floor
at a rate of 2.0 m/s 2 for 7.0 s. Find the net work done on the box.
Solution
Assume that the box starts from rest.
d=x
1
1
x0 = v0 t + at2 = 0 + 2.0 7.02 = 49 m.
2
2
Physics 110 Midterm II
April 13, 2016
SOLUTIONS
Show ALL your work clearly and neatly! Do each problem on a separate sheet and
use the back if you need more space.
1. A block of mass 10 kg is pulled up 10 m by a force of 100 N up an incline as shown in
th
1) A very light ideal spring with a spring constant (force constant) of 2.5 N/cm pulls horizontally on an 18kg box that is
resting on a horizontal floor. The coefficient of static friction between the box and the floor is 0.65, and the coefficient of
kin
Homework 1
(28) A horse trots away from its trainer in a straight line, moving 38 m away
in 9.0 s. It then turns abruptly and gallops halfway back in 1.8 s. Calculate
(a) its average speed and (b) its average velocity for the entire trip, using
away from
Homework 4
(57) A car drives straight down toward the bottom of a valley and up the
other side on a road whose bottom has a radius of curvature of 115 m. At
the very bottom, the normal force on the driver is twice his weight. At what
speed was the car tr
Homework 3
(47) What average force is required to stop a 950kg car in 8.0 s if the car
is traveling at 95 km/h?
Solution:
First find the average acceleration
aavg =
v
v0
t
=
0
95 km/hr
=
8s
3.3 m/s2
The average force on the car is found from Newtons sec
Practice problems #3
1) A wooden
raft has a mass of 50 kg. When empty it floats in water (density
with
69% of its volume submerged. What mass of sand can be put on the raft without it sinking?
is suspended from a scale reads 20.0 N. A beaker of water (hav
General Physics: Introductory Course in Mechanics, Heat, and Sound (Uses College Algebra)
PHYSICS 110

Fall 2013
1 A car moves along a straight horizontal path for 20 seconds, as follows : The first 10 seconds at
constant velocity v, and then it goes from v to 2v for the next 10 seconds. If the total distance travelled
during these 20 seconds is 200m , what is the v
General Physics: Introductory Course in Mechanics, Heat, and Sound (Uses College Algebra)
PHYSICS 110

Fall 2013
Homework 2
(35) V is a vector 24.8 units in magnitude and points at an angle of 23.4
above the negative xaxis. (a) Sketch this vector. (b) Calculate Vx and Vy .
(c) Use Vx and Vy to obtain (again) the magnitude and direction of V . [Note:
Part (c) is a
General Physics: Introductory Course in Mechanics, Heat, and Sound (Uses College Algebra)
PHYSICS 110

Fall 2013
Homework 3
(47) What average force is required to stop a 950kg car in 8.0 s if the car
is traveling at 95 km/h?
Solution:
First find the average acceleration
aavg =
0 95 km/hr
v v0
=
= 3.3 m/s2
t
8s
The average force on the car is found from Newtons sec
General Physics: Introductory Course in Mechanics, Heat, and Sound (Uses College Algebra)
PHYSICS 110

Fall 2013
Homework 4
(57) A car drives straight down toward the bottom of a valley and up the
other side on a road whose bottom has a radius of curvature of 115 m. At
the very bottom, the normal force on the driver is twice his weight. At what
speed was the car tr
General Physics: Introductory Course in Mechanics, Heat, and Sound (Uses College Algebra)
PHYSICS 110

Fall 2013
Homework 5
(69) A box of mass 4.0 kg is accelerated from rest by a force across a floor
at a rate of 2.0 m/s 2 for 7.0 s. Find the net work done on the box.
Solution
Assume that the box starts from rest.
1
1
d = x x0 = v0 t + at2 = 0 + 2.0 7.02 = 49 m.
2
General Physics: Introductory Course in Mechanics, Heat, and Sound (Uses College Algebra)
PHYSICS 110

Fall 2013
Homework 7
(7  10) An object at rest is suddenly broken apart into two fragments by
an explosion. One fragment acquires twice the kinetic energy of the other.
What is the ratio of their masses?
Solution
Momentum will be conserved in one dimension in the
General Physics: Introductory Course in Mechanics, Heat, and Sound (Uses College Algebra)
PHYSICS 110

Fall 2013
Physics 110 Syllabus
Instructor Information
Prof. Yonatan Abranyos
Office: 1214 B Hunter North
Email: [email protected]
Office Hours: Monday 5:35pm  6:35pm.
Course Description
Class Meets: Hunter West Building Room 511
Lecture Time: Monday and Wed