Question

Match the cases with the correct answer. Remember to use our sign convention from class (which way is positive and which way is negative)!

HINT: Draw a picture for each situation, paying close attention to the car's tire

1) A car is speeding up to the left. Assume that the tires are not slipping. In which direction are the tires' angular velocity pointing? 2)A car is slowing down to the left. Assume that the tires are not slipping. In which direction are the tires' angular velocity pointing? 3)A car is speeding up to the left. Assume that the tires are not slipping. In which direction are the tires' angular acceleration pointing? 4)A car is slowing down to the left. Assume that the tires are not slipping. In which direction are the tires' angular acceleration pointing? 5)A car is moving to the right with cruise control on. Assume that the tires are not slipping. In which direction are the tires' angular acceleration pointing? 6) A car is moving to the right with cruise control on. Assume that the tires are not slipping. In which direction are the tires' angular velocity pointing? 7)A car to moving up a 45 degree ramp (pointed upward and to the left) while slowing down. Assume that the tires are not slipping. In which direction are the tires' angular velocity pointing? 8)A car to moving up a 45 degree ramp (pointed upward and to the left) while slowing down. Assume that the tires are not slipping. In which direction are the tires' angular acceleration pointing? |
A.0 |

Answer #1

1) The correct match will be G. Considering the axis of rotation passing through the center of the wheel and using right hand thumb rule.

2)The correct match will be E. Since the velocity decreases and the direction of angular velocity will perpendicular to nthe direction of the linear velocity.

3) The correct match will be K. Since the direction of the angular acceleration will be in the radial direction.

4) The correct match will be F. This is the case of retardation so the direction of angular acceleration will be opposite to the one in the previous case

Match numbers with alphabets:
1. A car is speeding up to the left. Assume that the tires are
not slipping. In which direction are the tires' angular velocity
pointing?
2. A car is slowing down to the left. Assume that the tires are
not slipping. In which direction are the tires' angular velocity
pointing?
3. A car is speeding up to the left. Assume that the tires are
not slipping. In which direction are the tires' angular
acceleration pointing?
4....

An electron, a neutron(which has zero charge) and a proton are
in an electric field generated by charged plates which points in
the +x direction. The three particles are sufficiently far apart
that their forces on each other are negligible. Assume also that
forces other than the electrostatic ones on the three particles are
negligible.
We know that: (Choose the correct answers)
the acceleration of the electron is in the +x direction.
the x coordinate of the electron is less...

A jet accelerates at a=3.92 m/s^2 from rest until it reaches its
takeoff velocity of 360 km/hr. It has to travel for 5 seconds at
its takeoff velocity before taking off. What's the minimum distance
that the jet will travel on the runway?
A car backs up at a constant speed for a short time, then
applies the brakes and steadily comes to rest. Sketch velocity-time
and position-time graphs that depict the car's motion. Assume that
the forward direction is...

1.A boy jumps from rest, straight down from the top of a cliff.
He falls halfway down to the water below in 0.756 s. How much time
passes during his entire trip from the top down to the water?
Ignore air resistance. t = ?
2.An astronaut on a distant planet wants to determine its
acceleration due to gravity. The astronaut throws a rock straight
up with a velocity of +15.7 m/s and measures a time of 10.5 s
before...

3-A 1.0 kg block slides down an inclined plane of 39
0 from the horizontal. If the
block starts from rest and hits the bottom in 5.1 s,
what is the speed of the block, in the unit m/s, at the bottom of
the incline? Assume a frictionless plane.
4-A bus negotiates a turn of radius 103 m while traveling at a
speed of 92 km/h. If slipping just begins at this speed, what is
the coefficient of static friction between the...

Two boxes are stacked, with box B placed on top of box A. If box
A is pushed such that both boxes move with a decreasing speed, is
there any friction on either box?
(a) Kinetic friction on box A and no friction on box B (b)
Kinetic friction on box A and static friction on box B
(c) Kinetic friction on box A and kinetic friction on box B (d)
Static friction on box A and kinetic friction on...

Assessment
Identify the Variables!
In rotational kinematics - the variables are:
t = time, which is measured in s (for seconds)
θ = angle = what angle did the object turn thru, usually
measured radians
ωO = initial angular velocity = the rotational speed
of the object at the beginning of the problem, which is measured in
rad/s
ω = final angular velocity = the rotational speed of the object
at the end of the problem, which is measured in...

1. Usain Bolt sprints along the track, with his feet pushing
down and behind him. Therefore the track actually pushes Usain Bolt
along the track. Group of answer choices True or False
2.You study two objects in motion, Object J and Object S. Each
object has its own velocity graph, with same time and velocity
scales. The slope of each graph is positive, upward and to the
right ⁄ but Object J's tilt angle is only 10º and Object
S's tilt...

ch 6
1:
It is generally a good idea to gain an understanding of the
"size" of units. Consider the objects and calculate the kinetic
energy of each one.
A ladybug weighing 37.3 mg
flies by your head at 3.83 km/h
.
×10
J
A 7.15 kg
bowling ball slides (not rolls) down an alley at 17.5 km/h
.
J
A car weighing 1260 kg
moves at a speed of 49.5 km/h.
5:
The graph shows the ?-directed force
??...

Read the following letter and answer the questions:
Dear Sir:
I am writing in response to your request for additional
information in Block #3 of the accident reporting form. I put “Poor
Planning” as the cause of my accident. You said in your letter that
I should explain more fully and I trust that the following details
will be sufficient.
I am a bricklayer by trade. On the day of the accident, I was
working alone on the roof of...

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