Physics 6A Practice Midterm #2
1. A locomotive engine of mass M is attached to 5 train cars, each of mass M. The
engine produces a constant force that moves the train forward at acceleration a. If 3
of the cars are removed, what will be the acceleration o
Physics 6A
Practice Midterm #2
solutions
Prepared by Vince Zaccone
For Campus Learning
Assistance Services at UCSB
1. A locomotive engine of mass M is attached to 5 train cars, each of mass M. The engine produces a
constant force that moves the train forw
43v age Velocity. -
' Cféntaneous velocity. I 3) Yeeare a turn at 30.0 mls on a ramp of radius 25.!) m. What is ammtim
' A) 0333 mis2 '
_ 20.8 fmfs:2 - -
' D) 1.20. mfsz
_ 4) an airplane needs to reach a velocity of 217.0 kmm to take off. On a 2000 m r
1.
a)
b)
c)
d)
e)
Vector A B is shown and vector A has x- and y- components (5, 5). The magnitude of B is:
7
6
5
4
3
2. A person starts at a corner of a square track of side length 100 m and runs at a constant speed of 5 m/s for 1.25 laps.
What is the mag
Physics 6A Midterm Exam 8-9:15 a.m. class Wednesday, February 12, 2014 Version A
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
1) A 7.0-kg object is acted on by two forces. One of the forces is 10.0
Problem 24.1 (I) Monochromatic light falling on two slits 0.016 mm apart produces the fifthorder fringe at an 8.8 angle. What is the wavelength of the light used?
For constructive interference, the path difference is a multiple of the wavelength:
= m , m
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9a. Geometric Optics
Due: 11:00pm on Sunday, March 7, 2010
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Geometry
Physics 6A Freedman Final Exam
Saturday 3/15/2014
IMPORTANT: This exam is Version A
Instructions:
DO NOT OPEN THIS EXAM BOOK
UNTIL INSTRUCTED TO DO SO.
EXTREMELY IMPORTANT:
On your Scan-Tron form:
PRINT your NAME and your PERM NUMBER.
FILL IN THE BUBBL
Astro 1 Lecture 1 2010-03-29
A question for you:
Answer
Which of these four vectors has a positive x-component and
a negative ycomponent?
Which of these four vectors has a positive x-component and
a negative ycomponent?
!
A. A
!
B. B
!
C. C
!
D. D
E. none
Astro 1 Lecture 1 2010-03-29
1. Do we always need to make a free-body diagram for a cord?
Cant we just assume that the force is the same on both sides
of it? What if the cord is bent around a pulley?
2. Why arent the coefcients of kinetic friction and sta
Astro 1 Lecture 1 2010-03-29
Q3.6
A3.6
A question for you:
A pendulum swings back and forth, reaching a maximum angle of
45 from the vertical. Which arrow shows the direction of the
pendulum bobs acceleration at P (the far left point of the motion)?
A pen
Astro 1 Lecture 1 2010-03-29
A problem for you
1. What is the difference between centripetal and radial
acceleration?
2. Can you give an example of how a nonuniform circular
motion acceleration vector is not directed toward the center
of the circle?
3. Wh
Astro 1 Lecture 1 2010-03-29
Physics Mailbag
1. When theres a parabolic projectile, is it safe to
multiply by 2 the distance it takes for the object to
reach zero velocity at the peak of the curve to get the
entire distance the object covers?
2. How would
Astro 1 Lecture 1 2010-03-29
Q1. The change in momentum is used in the impulse-momentum
theorem, but I thought momentum was conserved in collisions.
Are they referring to the momentum of the entire system or just
one object?
Q2. Why does the center of mas
Astro 1 Lecture 1 2010-03-29
1. I dont completely understand the difference between an
inelastic collision and a completely inelastic collision. Are
most inelastic collisions completely inelastic?
3. Is it possible to have a truly isolated system on Earth
Astro 1 Lecture 1 2010-03-29
1. If the net force goes in the downward direction, does that
make it negative?
2. The book states that the only force that affects a system is an
external force. Yet if one steps onto an ice rink, one can
accelerate oneself o
Astro 1 Lecture 1 2010-03-29
The work-energy theorem
Q1: Does all kinetic energy transfer back into potential energy?
Q2: I am having a hard time understanding the equation for work
done by gravitational force. Why is it U-initial minus U-nal and not
the
Astro 1 Lecture 1 2010-03-29
Q1. How do you know what sign to use for the sum of torque? Is
counterclockwise always going to be positive, and clockwise
always negative?
Q2. Is the magnitude of torque more dependent on (a) the angle at
which the force acts
Astro 1 Lecture 1 2010-03-29
Q1: In chapter 10 they* describe
Hookes law as stress/strain=Y. Is this
the same as/related to the Hookes law
we used for springs?
* Whos they?
Q2: Why is it that the tensile or compression force applied to either
end of an ob
-the translational motion (v)
Dierent parts of the circular objects have dierent speeds
As it moves through space points on the bottom are moving left with respect to the center
Dierent parts of the object moves with dierent speeds except the center of
Physics 6A Practice Midterm Exam Freedman Winter 2014
1) A child standing on a bridge throws a rock straight down. The positive direction is upward. The rock leaves
the child's hand at t = 0. Which of the graphs shown here best represents the velocity of
Astro 1 Lecture 1 2010-03-29
Physics Mailbag
1. How is it possible for the acceleration of an object to remain
constant if the velocity of the object is changing? Isnt the
denition of acceleration the rate of change of velocity?
2. Why does a negative vel
-from 4-6 the slope is moving in the negative direction
-speed: 2m/s (in the negative direction)
-speed from 0-1 is 1m/s
-speed= rise/ run
-average velocity
-distance traveled= 6m
If velocity isn't changing its not accelerating
Slope= 0, a=0
Physics 6A First Midterm Exam Tuesday, January 29, 2013 - Version A
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
1) Estimate the number of times an average person's heart beats in a lifetime. Ass
Physics 6A Midterm-1 EQUATION SHEET
Magnitude of a vector A : A = A = Ax2 + Ay2 ; Ax = A cos ,
Ay = Asin
r
v
Average velocity and acceleration vave =
, displacement r = r2 r1
aave =
t
t
1
Linear motion
Linear Motion
with constant acceleration
Physics 6A
Prepared by Vince Zaccone
For Campus Learning
Assistance Services at UCSB
As long as its acceleration is constant*, the motion of any
object can be described by the following simple formulas:
(1)
x x 0 v
Uniform circular motion
-the object we're considering, it's trajectory is along the arc of a circle
-uniform implies the object is moving with constant speed
Is their velocity vector constant? No, direction is changing
Velocity vector is changing a
-if the rocket is launched at the escape speed very close to the surface of the planet
The rocket slowly down and asymptotically the speed approaches zero at the escape speed
As it slows down to 0 we can say it's very far away
If the rocket starts near