Materials Charging by Induction Lab-Cuyamaca College .

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The materials I used in the experiment are aluminum pan, Styrofoam plate, Styrofoam cup, tape, and string. The steps in building electrophorus that works effectively is as follows:

 

Step 1: I place the aluminum pan face up on the table and tape the Styrofoam cup upside down to the middle of the pan. In this case, the cup will serve as the insulating handle.

Step 2: I rub the wool on flat sheets of Styrofoam plate for a minute which is necessary for building up static electricity on flat, insulating material.

Step 3: The charged Styrofoam sheets were placed on the table. Then, I held the pan by the handle and lowered it onto the Styrofoam. After that, I brought my finger close to the aluminum pen and I got a small shock.

Step 4: After that, I brought my finger close to the aluminum pen and I got a small shock. Once it stopped giving me small shocks, I lifted it up and away from the Styrofoam. To make sure it will not stop working just rub the wool on Styrofoam sheets again.

Step 5: I tried to hang the tape on the edge of the table and observed that it suddenly moved.

Rubbing the wool against the Styrofoam sheets makes the wool lose some of its negative charges to the Styrofoam and now, Styrofoam has extra negative charge. The Styrofoam is an insulator that is stuck in place. When I put the aluminum pan on top (near charged Styrofoam) , the charges flow wherein the negative charges repel and it attracts positive charges. Now, the negative charge ends up on top of the pan. As I observed, negative charges repel from one another that the tape moved. Touching the pan helped the setup to provide a path for repelled negative charges to flow away from the pan. The pan loses some negative charge and now has extra positive charge. Meanwhile, lifting it up, the positive charge can spread evenly out of the pan and the effect is like repulsion that the tape moves. This process is called charging by induction wherein there is no transfer of negative charge on the aluminum pan. The negative charges just stayed there and repelling force rearranged the charges on the pan.

Electric Field Intensity Questions-Palomar College .

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1. A solid plastic sphere with a radius of 10 cm bears a uniform surface charge density of 360 µC/m2. What is the electric field intensity 1 cm into the sphere from the surface? Assume the permittivity is 9 pC2/N·m2.

Physics for Biologists Gravity Defying Creatures Lab 4-Cuyamaca College .

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Name: Physics for Biologists Lab 4: Gravity defying creatures __________________________________________________________________________ Overview ● Why is it that some creatures seem to defy gravity? ● How do all these components work together to achieve a stable and high-performing rocket? Theory ● Newton’s second law: F = ma ● Friction ● Freebody diagrams ______________________________________________________________________________ Creature 1: The Gecko 1. Draw a freebody diagram including all forces on the gecko above walking standing still on the surface of a vertical wall. 2. Do some investigating and find the approximate mass of a gecko in SI units. If you cannot find the mass in SI units then convert it. 3. Using this mass, determine the amount of force that each foot must generate in order to support its weight. 4. Research: Using online articles or videos, help crack the code for how Geckos are so good at what they do. What is the biophysical mechanism for their ability to walk on walls? Draw a microscopic picture to demonstrate your understanding. 5. The mechanism for how geckos do their walk has to do with something called Van der Waals forces. What are these forces and how do they work? Physics 190 Scott Stambach Cuyamaca College Creature 2: Black widows 1. Draw a freebody diagram including all forces on the spider standing still upside down on a horizontal ceiling. 2. Do some investigating and find the approximate mass of a black widow in SI units. If you cannot find the mass in SI units then convert it. 3. Using this mass, determine the amount of force that each foot must generate in order to support its weight. Physics 190 Scott Stambach Cuyamaca College 4. Research: Using online articles or videos, help crack the code for how spiders are so good at what they do. What is the biophysical mechanism for their ability to walk on walls? Is it unique to that of the geckos? 5. According to your research, how many times their own body weight can spiders safely hold while walking on walls. Physics 190 Scott Stambach Cuyamaca College Creature 3: Gerridae 1. Draw a freebody diagram including all forces on the Gerridae insect above standing on the surface of a pond water. 2. Do some investigating and find the approximate mass of a Gerridae in SI units. If you cannot find the mass in SI units then convert it. Physics 190 Scott Stambach Cuyamaca College 3. How much normal force must the water apply to each of the Gerridaes legs in order to get him to be able to stand on water? 4. Research: How does this work? How does the water generate enough normal force for the Gerridae to stand? Why does this not work with humans? Physics 190 Scott Stambach Cuyamaca College

PHS 101-Heat and Temperature Physical Science Worksheet- MVCC .

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Introduction to Physical Science Heat and Temperature Worksheet Concept Questions What are the differences and similarities of the three common temperature scales? Which is the most preferred in the scientific community? What is thermal expansion? Describe the difference between solids, liquids and gases in terms of the kinetic theory of matter. What is the difference between specific and latent heat? What is the difference between heat and temperature? How does pressure effect the phase of matter? Problem Solving Convert 22.0 Kelvin to Celsius and Fahrenheit. Convert 45.6 oF to Celsius and Kelvin. Show that it would take 55.4 calories of heat to change the temperature of 40 g of copper from 10.0oC to 25.0oC. If 240 calories of heat is added to 75 grams of gold, show its temperature will increase by 106.3 oC. Show that the amount of heat needed to take 10 grams of ice at -5oC and turn it into water at 65oC is 1,475 calories. Show that the amount of heat need to change 25 grams of water at 40oC into steam at 125oC is 15,312.5 calories.

Why Not Fill the Lid with Tap Water Instead of Oil Discussion Questions-CUNY .

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1. How can pepper possibly become polarized; is there something inside it that conducts electricity? 2. Why not fill the lid with tap water instead of oil? Think about the answer to the first question when explaining why this probably won’t work

Average Speed of Electrical Circuit Physics Questions-University of California .

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View Policies Current Attempt in Progress A plane is sitting on a runway, awaiting takeoff. On an adjacent parallel runway, another plane lands and passes the stationary plane at a speed of 40.9 m/s. The arriving plane has a length of 36.1 m. By looking out of a window (very narrow), a passenger on the stationary plane can see the moving plane. For how long a time is the moving plane visible?Number i Units A bicyclist makes a trip that consists of three parts, each in the same direction (due north) along a straight road. During the first part, she rides for 17.8 minutes at an average speed of 6.95 m/s. During the second part, she rides for 41.9 minutes at an average speed of 3.51 m/s. Finally, during the third part, she rides for 11.6 minutes at an average speed of 19.4 m/s. (a) How far has the bicyclist traveled during the entire trip? (b) What is the average speed of the bicyclist for the trip? (a) Number i Units (b) Number i Units View Policies Current Attempt in Progress Electrons move through a certain electrical circuit at an average speed of 1.6 x 102 m/s. How long (in minutes) does it take an electron to traverse a 1.4-m light bulb filament coil? Number Units The data in the following table represent the initial and final velocities for a boat traveling along the x axis. The elapsed time for each of the four pairs of velocities in the table is 0.50 s. Review the concept of average acceleration in Section 2.3 and then determine the average acceleration (magnitude and direction) for each of the four pairs. Note that the algebraic sign of your answers will convey the direction. Initial velocity vo Final velocity v (a) +1.5m/s +4.7 m/s (b) +4.8m/s +1.9m/s (c) –5.8m/s -3.4 m/s (d) +3.9m/s -4.2 m/s (a) ā= i (b)ā – i (c)ā= i (d)ā= Over a time interval of 1.56 years, the velocity of a planet orbiting a distant star reverses direction, changing from +17.0 km/s to -19.1 km/s. Find (a) the total change in the planet’s velocity (in m/s) and (b) its average acceleration (in m/s2) during this interval. Include the correct algebraic sign with your answers to convey the directions of the velocity and the acceleration. (a) Number i Units (b) Number i Units A runner accelerates to a final velocity of 5.67 m/s due west in 2.00 s. His average acceleration is 0.609 m/s2, also directed due west. (a) What was his velocity when he began accelerating? (Enter the magnitude of the initial velocity.) i (b) Select the direction: In an historical movie, two knights on horseback start from rest 84.9 m apart and ride directly toward each other to do battle. Sir George’s acceleration has a magnitude of 0.231 m/s2, while Sir Alfred’s has a magnitude of 0.349 m/s2. Relative to Sir George’s starting point, where do the knights collide? Number i Units Refer to Multiple-Concept Example 5 to review a method by which this problem can be solved. You are driving your car, and the traffic light ahead turns red. You apply the brakes for 2.25 s, and the velocity of the car decreases to +4.60 m/s. The car’s deceleration has a magnitude of 3.36 m/s2 during this time. What is the car’s displacement? X= Before starting this problem, review Multiple-Concept Example 6. The left ventricle of the heart accelerates blood from rest to a velocity of +26.7 cm/s. (a) If the displacement of the blood during the acceleration is +2.05 cm, determine its acceleration (in cm/s2). (b) How much time does blood take to reach its final velocity? (a) Number i Units (b) Number Units A dynamite blast at a quarry launches a rock straight upward, and 2.1 s later it is rising at a rate of 20 m/s. Assuming air resistance has no effect on the rock, calculate its speed (a) at launch and (b) 5.9 s after launch. (a)Number i ! Units m/s (b)Number i ! Units m/s V A golf ball is dropped from rest from a height of 9.50 m. It hits the pavement, then bounces back up, rising just 5.20 m before falling back down again. A boy then catches the ball when it is 1.00 m above the pavement. Ignoring air resistance, calculate the total amount of time that the ball is in the air, from drop to catch. hi hz Number i Units

Electrostatic Force Physics Analysis-Cuyahoga Community College .

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1. In Step 4, were the strips attracted or repelled, and precisely why would they end up behaving that way? 2. In Step 6, were the strips attracted or repelled, and precisely why would they end up behaving that way? 3. In Step 8, the water may have acted in a peculiar manner with respect to the strips’ charges. Exactly what did it do, and why did it do this?

 

Proportionality Relations Worksheet-MTSU.

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Workbook #1 – Module #1 PHYS2050 Problem 1: Proportionality relations. John and Linda are arguing about the definition of density. John says the density of an object is proportional to its mass. Linda says the object’s mass is proportional to its density and to its volume. Which one, if either, is correct? A. They are both wrong. B. John is correct, but Linda is wrong. C. John is wrong, but Linda is correct. D. They are both correct. E. They are free to redefine density as they wish. First, answer the following questions that should help you find the right answer to the main question below: a) What is the formula for the density? b) What does it mean that two quantities are proportional to each other? c) Can two quantities be inversely proportional? What does it mean? d) Can you think of any physical or mathematical relation in which two quantities are proportional to each other? 1 Workbook #1 – Module #1 PHYS2050 Problem 2: Estimates: Order of magnitude. How many aluminum soft drink cans are thrown away or recycled each year by US consumers? Before you answer that question list all the assumptions that you make to estimate the number of aluminum cans: Provide your answer below: 2

Physics Worksheet-Palomar College .

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EXAMPLE II Given: The force acting on the pole at point A. Find: The components of the force acting parallel and perpendicular to the axis of the pole. Plan: 1. Find F, rOA and uOA 2. Determine the parallel component of F using F|| = F • uOA 3. The perpendicular component of F is F⊥ = (F2 – F|| 2) ½ Statics, Fourteenth Edition R.C. Hibbeler Copyright ©2016 by Pearson Education, Inc. All rights reserved.

Physics Energy Electroscope Worksheet-Palomar College .

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How do I solve this problem?”. Instead, ask specifics questions, like “Did anyone use the concept of energy to solve this problem?” or “Which coordinate system did you use to solve the problem?