Physics 201
General Physics I
(PHYS 201)
Dr. J. Ulises Reveles
701 W. Grace St., Room 2417
jureveles@.vcu.edu
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Syllabus for PHYS201
10 % In-class participation need clickers latest by THUR (9/1), 3 lowes
PHYS 208 Recitation #9 Chapter 31 & 32
Name:
Solutions
.
1. (Knight 31.33) A capacitor is discharged through a 100 resistor. The discharge current decreases
to 25% of its initial value in 2.5 ms. What is the value of the capacitor?
2. (Knight 31.74) The
PHYS 208 Recitation #8 Chapter 31
Name:
1.
Solutions
.
(Knight 31.4)
a. What are the magnitude and direction of the current in the 18 resistor in the figure?
b. Draw a graph of the potential as a function of the distance traveled through the circuit, trav
PHYS 208 Recitation #3 Chapter 26 & 27
Name:
Solutions
1. (Knight 26.45) A plastic rod with linear charge density is bent
into the quarter circle shown in the figure. We want to find the
electric field at the origin.
a. Write expressions for the - and -co
PHYS 208 Recitation #12 Chapter 34 & 23
Name:
Solutions
.
1. (Knight CQ34.7) In what directions are the electromagnetic waves traveling in the figure?
2. (Knight 34.11) A 5.0-cm-diameter parallel-plate capacitor has a 0.50 mm gap. What is the displacement
PHYS 208 Recitation #11 Chapter 33 & 35
Name:
Solutions
.
1. (Knight 33.38) The figure shows a 1.0 cm loop with
0.50 inside a 2.0 cm diameter solenoid.
The solenoid is 8.0 cm long, has 120 turns, and carries the current shown in the graph. A positive
cur
PHYS 208 Recitation #4 Chapter 27 & 28
Name:
Solution
1. (Knight 27.47, modified) The three parallel planes of charge shown in the figure have surface charge
, 2 , and
densities
. Use Gausss Law to find the electric fields
and
in regions 1
and 2
Hint: Fol
PHYS 208 Recitation #13 Chapter 23 & 22
Name: _
1. For a plane mirror, locate the top and bottom of the image by drawing 3 rays from each end.
Tofindtheimage,wedrawthethreeincidentlightraysshownbelowandusethelawof
reflectiontodeterminethedirectionoftheref
PHY 171
Discussion Session Worksheet 9
(February 2, 2012)
Usually, I dont post solutions to discussion worksheets (unlike homework solutions which are
always posted), because I want students attending classes to discuss solutions to these
problems in clas
PHYS 208 Recitation #10 Chapter 32 & 33
Name:
Solution
.
1. (Knight 32.21) The value of the line integral of
3.77 10 T m. What is ?
around the closed path shown in the figure is
Note: Must use proper RHR here curl fingers in direction of
line integral, t
PHYS 208 Recitation #1 Chapter 25
Name:
Solutions
1. (Knight 25.3) A glass rod that has been charged to +12 nC touches a metal sphere. Afterward, the
rods charge is +8.0 nC.
a) What kind of charged particle was transferred between the rod and the sphere,
BIO 141-TEST #1 (CHs 1; 4):
Shaheem Abrahams
1.
POTENTIAL ESSAY QUESTIONS
The concept of STRUCTURE-FUNCTION shows up everywhere in Anatomy-&-Physiology.
Choose a structure (cell; tissue; organ) in the human body to highlight this close relationship betwee
The crane below uses a steel cable to lift one end of a 1400 kg iron sheet as shown. If
the sheet is 14 m long and of uniform density, what is the minimum tension in the
cable?
35000 N
-21000 N
21000 N
7000 N
63000 N
The crane below uses a steel cable to
A massless meter stick is fixed at point C, which is at a distance L (25
cm) from its left-hand end. The rod is free to rotate at point C. If a
downward force of 187.5 N is applied at point A. what is the
minimum force that must be applied at point B to k
A uniform meter stick weighing 30 N has a 40 N weigth on its left end
and a 20 N weight on its right end. The bar is hung from a rope. What
is the tension in the rope and how far from the left end of the bar
should the rope be attached so that the stick r
A kid rides on the edge of a merry-go-round as it rotates
counterclockwise (when viewed from above). The kid holds a ball
straight out from the edge of the merry-go-round and releases it.
Which is the correct path followed by the ball after it is released
A man with a mass of 100 kg sits on a large seesaw 6 m from the center. Two children each
with a mas of 20 kg are seated on the other side of the seesaw. One child seats 5 m from the
center. How far from the center should the other child seat to balance t
A spinning disk is rotating at a rate of 2 rad/s in the positive
counterclock-wise direction. If the disk is slowing down at a rate
of 4 rad/s2, Find the wheel's angular velocity in rad/s after 4 s.
o = o + t.
o = 2 + (-4*4) negative because slowing down
A cyclist starts from rest and pedals such that the wheels of his bike have a constant
angular acceleration.
After 14 s, the wheels have made 44 rev.
-What is the angular velocity of the wheels after 14 s in rad/s ?
Wi=0 rad/s
t=14s
=56 rev * 2 rad/1 rev
2.)
A battery-driven Percy engine goes around a track (radius 30 cm) in 55 seconds.
What is its angular speed?
o T= 55 sec.
o W=? = distance/time
o W= 2 rad/ 55 sec
W= [rad/s]=[1/s]
What is its tangential speed?
0.114 1/s
o V= r * w
o V= (0.3 m)[0.114 1
A bicyclist rides with a constant velocity of 9 m/s (see figure). Consider the motion of a piece
of gum stuck to her tire (radius 0.24 m).
What is the magnitude of its angular velocity vector?
o V= r*w
o 9 m/s = .24 m * w w= (9 m/s)/ .24m
o w = 37.5 1/s
-If the radius of the wheel is 38 cm, and the wheel rolls without
slipping, how far has the cyclist (in m) traveled in 14 s?
X= r * Use this one change 38cm to m 0.38 m
V= r * w
au= r *
o X = (0.38 m)(351.86 rad) = 133.71 m
- Another:
A cyclist starts
-If the radius of the wheel is 38 cm, and the wheel rolls without
slipping, how far has the cyclist (in m) traveled in 14 s?
X= r * Use this one change 38cm to m 0.38 m
V= r * w
au= r *
o X = (0.38 m)(351.86 rad) = 133.71 m
- Another:
A cyclist starts
You are exiting a highway and need to slow down on the off-ramp
in order to make the curve. It is rainy and the coefficient of static
friction between your tires and the road is only 0.2. If the radius of
the off-ramp curve is 32 m, then to what speed do
25). A fish (8 kg) is being yanked vertically upward out of the water and the fishing line
breaks. If the line is rated to a maximum tension of 240 N (~ 53 lb test), then what was the
minimum acceleration of the fish (in m/s2)?
T + W1E = m*a
240kg + -80
16.)
A ship sails 40 kilometers 20 degrees north of east. It then turns 90 degrees to
the west, giving it a new heading of 70 degrees north of west.
After sailing another 50 kilometers, how far is the boat (in kilometers) from where it
started?
o A=(40cos
28).
A hockey puck (mass = 1.5 kg) leaves the players stick (moving to the left) with a speed of
22 m/s and slides on the ice before coming to rest.
The coefficient of friction between the puck and the ice is 0.4.
What is the normal force on the puck?
o
Block 1 (m1 = 1 kg) is resting on top of block 2 (m2 = 8 kg) on the surface of a table.
On a sheet of paper, draw the free body diagrams for block 1 and block 2 using the
two-subscript notation from class. After completing the free body diagrams, enter
b
32). MOTION OF ACCELERATING CAR
A car on a flat road accelerates from rest at a constant rate and covers a distance of 100
m in 6 s. The mass of the car is 800 kg.
What is the acceleration of the car?
o m/s
What is the net force on the car?
o N
The car