1. The drawing shows three containers filled to the same height with the same fluid. In which container, if any, is the pressure at the bottom greatest? (a) Container A, because its bottom has the greatest surface area. (b) All three containers have the same pressure at the bottom. (c) Container A, because it has the greatest volume of fluid. (d) Container B, because it has the least volume of fluid. (e) Container C, because its bottom has the least surface area. 2. Three solid objects are floating in a liquid, as in the drawing. They have different weights and volumes, but have the same thickness (the dimension perpendicular to the page). Rank the objects according to their density, largest first. (a) A, B, C (b) A, C, B (c) B, A, C (d) B, C, A (e) C, A, B 3. The kinetic energy of an object attached to a horizontal ideal spring is denoted by KE and the elastic potential energy by PE. For the simple harmonic motion of this object the maximum kinetic energy and the maximum elastic potential energy during an oscillation cycle are KEmax and PEmax , respectively. In the absence of friction, air resistance, and any other nonconservative forces, which of the following equations applies to the object–spring system? A. KE+PE = constant B. KEmax = PEmax (a) A, but not B (b) B, but not A (c) A and B (d) Neither A nor B 4. The drawing shows three objects rotating about a vertical axis. The mass of each object is given in terms of m0 , and its perpendicular distance from the axis is specified in terms of r0. Rank the three objects according to their moments of inertia, largest to smallest. (a) A, B, C (b) A, C, B (c) B, A, C (d) B, C, A (e) C, A, B 5. The drawing illustrates an overhead view of a door and its axis of rotation. The axis is perpendicular to the page. There are four forces acting on the door, and they have the same magnitude. Rank the torque τ that each force produces, largest to smallest. (a) (b) (c) (d) (e) τ4 , τ3 , τ2 , τ1 τ3 , τ2 , τ1 and τ4 (a two-way...

...for 1s from 1.6m to 0.2m
it remained at rest for 2s at 0.2m
it moved in the positive direction with a constant speed for 3s’
DISCUSSIONS
I found out that the main of this experiment which is from the experiment I can say that the slope of the distance vs time graph is the velocity of the object the experiment graphs show certain properties which tells whether the object is moving in the negative direction or whether it is moving in the positive direction , if the object is at rest or if it is in motion. If the slope of the graph is increasing it means the object is moving away for the motion detector and if it is decreasing the person is moving towards the motion detector and if the slope is 0 the person is at rest
REFERENCE
Physic for engineers and scientist-serway and jewatt
...

...
Free Fall
Rachel Shea
Physics 131 Lab, QL
Hasbrouck 210
Sept. 21, 2014
Abstract
This experiment measures the study of motion by observing the force of gravity acting solely upon an object, and also measures reaction time. If an object is in free fall, the only force acting upon it is gravity. The object used in this experiment was a golf ball that provided some acceleration when dropped. A sensor positioned underneath a table recorded the golf ball’s pattern of motion, when dropped. The main objective of performing this experiment is to measure the velocity and position of the ball to eventually find the acceleration of free fall. A computer program called, DataStudio, was used to create a graph of position vs. time and a graph of velocity vs. time. The second part of the experiment involved randomly dropping a ruler and having your partner catch it to determine reaction time.
Questions
1. The parabolic curves open upward instead of downward because of the golf balls movement over time: where it is dropped from, to where it ends up. The ball begins close to the sensor, then drops to the ground, then bounces back up closer to sensor again, therefore the bounces correspond with the bottom curves of the parabola. If the data were collected from the floor then the curve would open downward. But because the sensor graphs the position from the sensor, the curve was upwards.
2.
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The slope of the velocity versus time graph physically...

...accident such as car crash, since the momentum changes instantly, the force becomes extremely great. Impulsive force is produced during the collision and it will cause severe damage to the car, and may also injure the passengers in it. 3 The passengers’ momentum can be stopped by objects in the car such as dashboard, side door, or windshield, however, it will cause serious injuries because the force would be very great. To increase the safety of the driver and the passengers, safety devices such as seatbelts, air bags, crumple zones, and etc. are introduced. Safety devices such as seatbelts, air bags, crumple zones and etc are designed to reduce the forces on the body if there is a collision. These safety devices are mostly made based on the physics principle of force and momentum, which is
This relationship says that if momentum is transferred over a longer period of time, the force involved is less. If the force of a collision can be reduced, then the chances that someone would get hurt in an accident are lower.4 Since momentum cannot be transformed to another form of energy, it is always conserved during any collision. The change in momentum is then a fixed quantity, and to lower the force, changes have to be made in the time of the collision.5 The time required for the car to stop in a collision have to be increased so that the forces that will impact the occupant will be lower, and they will be less likely to be hurt. If the time taken for the change...

...Abstract:
The students investigated about freezing point depression and at what temperature the substance changes states. The students used the freezing point depression to find the molar mass of benzoic acid. First they heated lauric acid to determine the temperature that the freezing point of the solvent is and then compared the temperature to that of the lauric acid/ benzoic acid solution. They then took the change in temperature in order to determine the molality of the benzoic acid, which was calculated to be 1 mol/kg. Then they found the moles of benzoic acid to be 0.00805 mol. using what they found in the experiment they compared it with the 1.00 g of benzoic acid that was added to in experiment, they found that the molar mass of benzoic acid was 125.46 g/mol.
Apparatus:
Materials:
Lauric Acid
Benzoic Acid
Culture Tube With Cap
Safety Goggles
Bunsen Burner
Wire Gauze
Iron Ring
Spatula
Blank Label
Ring Stand
400-mL Beaker
Thermometer
Utility Clamp
Paper Towels
Theory:
The lab focused on molality and its relation to the temperature change of a substances freezing point depression. Students relationship found the equation delta T = K(f) x m. Students were figure out that based on the molar mass of benzoic acid added that it affected the freezing point of lauric acid. The freezing point of the solution is depressed because the molecules of the benzoic acid allowed for the bonding of the lauric acid molecules, therefore increasing the...

...UIC PHYSICS 105 Spring 2013 Practice Exam 1
UIC Physics 105
Midterm Practice Exam 1
Spring 2013
Best if used by February 17
PROBLEM Multiple Choice Short Problem 1 Short Problem 2 Short Problem 3 Short Problem 4 Short Problem 5 Short Problem 6 Total POINTS 40 10 10 10 10 10 10 100 SCORE
Page 1 of 11
UIC PHYSICS 105 Spring 2013 Practice Exam 1
MULTIPLE CHOICE QUESTIONS (2 points each) Clearly circle the letter of the best answer MCQ 1: The figure to the right represents the position of a particle as it travels along the x-axis. At what value of t is the velocity of the particle equal to zero? (A) 1 s Answer: velocity = slope of x vs t line (B) 2 s slope = 0 at t = 3 s (C) 3 s (D) 4 s
MCQ 2: A runner runs around a track consisting of two parallel lines 96 m long connected at the ends by two semicircles with a radius of 49 m. She completes one lap in 100 seconds. What is her average velocity? (A) 2.5 m/s ∆ (B) 5.0 m/s Answer: 0 m/s ∆ ∆ (C) 10 m/s (D) 0 m/s MCQ 3: You drop a very bouncy rubber ball. It falls, and then it hits the floor and bounces right back up to you. Which of the following represents the v vs. t graph for this motion?
Answer: Initially, the ball is falling down, so its velocity must be negative (if UP is positive). Its velocity is also increasing in magnitude as it falls. Once it bounces, it changes direction and then has a positive...

...physics
5/23/13
Constant motion
Fill in the Blank
(constant velocity)
1)Neither( ) nor ( ) of motion changes
2)y7ui8z
Vocabulary Matching
3)
A)how fast something moves; an expression of how much time it takes for a change in position to occur; rate of motion; rate of change of position( )
B)The speed of an object in a particular direction; ratio of change in position to time interval over which change takes place.( )
C)quantity having both magnitude and direction( )
D)the separation of two points; the actual distance traveled; a scalar quantity( )
E)speed that does not change( )
F)rate of motion varies( )
G)velocity that does not change over time( )
Velocity,constant speed,average speed,distance,vector quantity,speed,constant velocity
Concept questions
4)
5)
Problem
6)A baseball pitcher throws a 30 m/s fastball toward the batter, 20 meters away. The batter hits a line drive right over the pitcher's head into center field. The fielder stops the ball 2 seconds after it is hit, 80 meters from home plate. He hesistates for 2 seconds and then throws the ball at 18 m/s to the second baseman, who catches the ball 2.2 seconds later.
a) How long does it take for the ball to travel to home plate?
b) Find the ball's average velocity on its trip from the batter to the outfielder.
c) Find the distance from outfielder to second base.
7)Two cars are moving at constant...

...In physics, motion is a change in position of an object with respect to time and its reference point. Motion is typically described in terms of velocity, acceleration, displacement, and time.[1] Motion is observed by attaching a frame of reference to a body and measuring its change in position relative to another reference frame.
A body which does not move is said to be at rest, motionless, immobile, stationary, or to have constant (time-invariant) position. An object's motion cannot change unless it is acted upon by a force, as described by Newton's first law. An object's momentum is directly related to the object's mass and velocity, and the total momentum of all objects in a closed system (one not affected by external forces) does not change with time, as described by the law of conservation of momentum.
As there is no absolute frame of reference, absolute motion cannot be determined.[2] Thus, everything in the universe can be considered to be moving.[3]
Main types of simple motion
There are two types of basic motion: translation and rotation. Translation means motion along a path. Rotation means motion around a fixed axis. An axis is the centre around which something rotates. As we have mentioned before, each type of motion is controlled by a different type of force. Translation is defined by the net force (sum of different forces) acting on an object. Rotation is defined by torque. Torque is a force which causes the rotation of an object.
Linear...