I have two assignments I need completed by this evening for physics. I need a paper 500 words written on global warming three paragraphs describing evidence of Earth heading to global warming catastrophe and a final statemnt stating my opinion and i do believe we are heading toward global warming. I also hav textbook questions as well. Please help!!!
Question 1 Not yet answered Marked out of 1 Not flaggedFlag question Question text How many significant figures are in 1.609? Select one: a. 3 b. 4 c. 2 d. 1 Question 2 Not yet answered Marked out of 1 Not flaggedFlag question Question text How many significant figures are in .00254? Select one: a. 5 b. 3 c. 6 d. 2 Question 3 Not yet answered Marked out of 1 Not flaggedFlag question Question text Which is greater, an acceleration from 25 km/h to 30 km/h or one from 96 km/h to 100 km/h if both occur during the same time? Select one: a. 25 km/h to 30 km/h b. 96 km/h to 100 km/h c. Same acceleration for both. d. Not enough information Question 4 Not yet answered Marked out of 1 Not flaggedFlag question Question text Light travels in a straight line at a constant speed (constant velocity) of 300,000 km/s. What is the acceleration of light? Select one: a. 0 b. 300,000 km/s c. Not enough information. d. 9.8 m/s^2 Question 5 Not yet answered Marked out of 1 Not flaggedFlag question Question text John and Tracy look from their 80.-m high-rise balcony to a swimming pool below-not exactly below, but rather 12 m out from the bottom of their building. They wonder how fast they would have jump horizontally to succeed in reaching the pool. What is the answer? Select one: a. 5 m/s b. 80 m/s c. 20 m/s d. 3.0 m/s Question 6 Not yet answered Marked out of 1 Not flaggedFlag question Question text A ball is thrown horizontally from a cliff at a speed of 10 m/s. What is its speed two second later. Note: Find the vertical component of the velocity after 2 second by using v (vertical component) = gt and since there is no horizontal acceleration, the horizontal velocity does not change and is equal to 10 m/s. Now find the speed (magnitude of the resultant velocity) with the use of Pythogorean theorem. That is V = SQRT [(v-(vertical component))^2 + (v-(horizontal component))^2]. Select one: a. 14 m/s b. 22 m/s c. 10 m/s d. 19.8 m/s Question 7 Not yet answered Marked out of 1 Not flaggedFlag question Question text What is the acceleration of a 40-kg block of cement when pulled sideways with a net force of 200 N? Select one: a. 0.2 m/s^2 b. 5 m/s^2. c. 8000 m/s^2. d. 0 Question 8 Not yet answered Marked out of 1 Not flaggedFlag question Question text If a mass of 1 kg is accelerated 1 m/s^2 by a force of 1 N, what would be the acceleration of 2 kg acted on by a force of 4 N? Select one: a. 2 m/s^2. b. 4 m/s^2. c. 0 d. 1 m/s^2. Question 9 Not yet answered Marked out of 1 Not flaggedFlag question Question text What is the acceleration of a 25-kg block of cement when pulled sideways with a net force of 200 N? Select one: a. 0.2 m/s^2 b. 5 m/s^2. c. 8000 m/s^2. d. 8 m/s^2 Question 10 Not yet answered Marked out of 1 Not flaggedFlag question Question text How many joules of kinetic energy does a 1-kg book have when it is tossed across the room at a speed of 2 m/s? Select one: a. 2 J b. 4 J c. 0 J d. 0.5 J Question 11 Not yet answered Marked out of 1 Not flaggedFlag question Question text This question is typical on some driver's license exams: A car moving at 50 km/h skids 15 m with locked brakes. How far will the car skid with the locked brakes at 150 km/h? Select one: a. 45 m b. 135 m c. 15 m d. 150 m Question 12 Not yet answered Marked out of 1 Not flaggedFlag question Question text Why is it incorrect to say that impulse equals momentum? Select one: a. Impulse = momentum x force b. Impulse = momentum x time c. Impulse is equal to change in momentum d. It is the same. Question 13 Not yet answered Marked out of 1 Not flaggedFlag question Question text Lillian (mass 40 kg) standing on slippery ice catches her leaping dog (mass 15 kg) moving horizontally at 3.0 m/s. What is the speed of Lillian and her dog after the catch? Select one: a. 3 m/s b. 0.82 m/s c. 0 m/s d. 9 m/s Question 14 Not yet answered Marked out of 1 Not flaggedFlag question Question text A lady bug sits halfway between the axis and the edge of a phonograph record. What will happen to its tangential speed if the RPM is doubled? At this doubled rate, what will happen to its tangential speed if it crawls out to the edge? Select one: a. (a) no change, (b) no change b. (a) doubled, (b) four times the original value in first part. c. (a) doubled, (b) doubled, d. (a) half the value, (b) one fourth the original value Question 15 Not yet answered Marked out of 1 Not flaggedFlag question Question text What is the tangential speed of a passenger on a Ferris wheel that has a radius of 10 m and rotate once in 30 s? Select one: a. 0.33 m/s b. 10 m/s c. 300 m/s d. 2 m/s Question 16 Not yet answered Marked out of 1 Not flaggedFlag question Question text Consider a bicycle that has wheels with a circumference of 2 m. What is the linear speed of the bicycle when the wheels rotate at 1 revolution per second? Select one: a. 1 m/s b. 2 m/s c. 3 m/s d. 4 m/s Question 17 Not yet answered Marked out of 1 Not flaggedFlag question Question text What is the tangential speed of a passenger on a Ferris wheel that has a radius of 10 m and rotate once in 20 s? Select one: a. 3 m/s b. 10 m/s c. 20 m/s; d. 2 m/s Question 18 Not yet answered Marked out of 1 Not flaggedFlag question Question text A 10,000 N vehicle is stalled one-quarter the way across the bridge. Calculate the additional reaction forces that are supplied at the supports on both ends of the bridge. Note: Both forces at the end will be vertically upwards. Select one: a. 5000 N at both ends b. 7500 N at right end and 2500 N at left end c. 7500 N at the left end and 2500 N at the right end d. 10,000 N at both ends Question 19 Not yet answered Marked out of 1 Not flaggedFlag question Question text To tighten a bolt, you push with a force of 80 N at the end of a wrench handle that is 0.25 m from the axis of the bolt. (a) What torque are you exerting? (b) If you move your hand inward to be only 0.10 m from the bolt, what force do you have to exert to achieve the same torque? Select one: a. (a) 20 N.m, and (b) 200 N b. (a) 20 N.m, and (b) 80 N c. (a) 320 N.m, and (b) 200 N d. (a) 80 N.m, and (b) 80 N Question 20 Not yet answered Marked out of 1 Not flaggedFlag question Question text Which has more volume - a kilogram of gold or a kilogram of aluminum? Select one: a. a kilogram of gold has more volume b. a kilogram of aluminum gas more volume c. same volume for both d. not enough information Question 21 Not yet answered Marked out of 1 Not flaggedFlag question Question text A rectangular barge, 5 m long and 2 m wide, floats in fresh water. (a) find how much deeper it floats when its load is 400-kg horse. (b) If the barge can only be pushed 15 cm deeper into the water before water overflows to sink it, how many 400-kg horses can it carry? Note that buoyant force = volume displaced x density of water x g, where density of water is 1000 kg/m^3 and g = 10 m/s^2. Also 400 kg load is 400 g = 4000 N. Select one: a. .04 m or 4 cm and 3 horses only b. .15 m or 15 cm and only 1 horse c. .01 m or 10 cm and only 1 horse d. .01 m or 1 cm and 15 horses Question 22 Not yet answered Marked out of 1 Not flaggedFlag question Question text What is the mass of a cubic meter of air at room temperature (20 deg. C)? Note that the density of air at room temperature (20 deg. C) is 1.21 kg/m^3. Select one: a. 20 kg b. 1.21 kg c. 10 kg d. 0.1 kg
physics formal written lab report ( too easy ) i uploaded images about the lab what we did in class and what you need to do for report, please check them. images NUMBER : 6379, 6380, 6381 are instructions about how to do lab report.
A workman on the scaffolding outside one of the science classrooms drops a wrench. A physics student, bored with the lesson, times it as it falls past the classroom window. She found that it took 0.6s to fall past the 2m tall window. Calculate the spanner’s initial velocity as it appears at the top of the window.
Hi, I'd Like you to my Pre-Lab Physic. It's 2 pre-labs. Here is the link for the book as an ebook. If the pics are not clear see the link below. Pages(lab 3: 37-38) & (lab 4 : 47-48) http://uqu.edu.sa/files2/tiny_mce/plugins/filemanager/files/3930328/ebooksclub.org__Physics_Laboratory_Manual__3rd_Ed__.pdf
The structures for the lab report are: 1- Separate cover page. 2- Purpose. 3- What was this Experiment? 4- What we did- Performing the Experiment. 5- Data and calculations 6- Executive Summary. The attachments are the Lab and PROBLEMS. It's due monday morning.
ERRORS There are several types and sources of experimental errors: The accuracy limitations of the measuring device: For example a digital scale may be accurate to 0.1 g, 0.01 g, 0.001 g, etc., a precision analytical balance may be accurate to 0.0002 g or 0.2 mg. Instrument errors due to calibration of an instrument. Reading errors: Incorrectly interpreting interpolated values; inaccurate readings due to fluctuating instrument read-outs. Uncontrolled environmental factors: Slight temperature or humidity variation in the laboratory may affect the measurements. Over-simplifications or inherent limitations in the experimental design: For example, we may not be able to achieve a totally frictionless environment in a physics experiment. Human errors: Reading the measurement incorrectly, or simply writing down the wrong number; reading a scale at angle may result in a “parallax error.” Experimental error is the difference between a measurement and the true value. However, because we will know the true value, we have to make an estimation of this true value. QUESTION 1 Imagine that your team has been assigned by a construction company to measure the dimensions of an empty lot in a subdivision. Briefly give examples of the 6 types/sources of errors described above and explain what you would do to minimize them. Two important concepts: Accuracy and Precision. Accuracy refers to how close a measured value is to the true or accepted value. As the true value of the quantity is often not known, it may be impossible to determine the accuracy of a measurement. Instead, we rely on estimated values. Precision (also known as repeatability or reproducibility)refers to how closely repeated measurements agree with each other under identical experimental conditions. These concepts are typically represented using the following bull’s eye diagrams: QUESTION 2 A certain gas is known to have a pressure of 9 psi. We are asked to take measurements using two different sensors. These are the results that we obtained after measuring the pressure of the gas 7 different times. Sensor 1: 9.8 10.010.3 9.7 9.9 10.1 9.8 Sensor 2: 9.3 9.5 8.6 9.0 8.9 9.2 8.5 Do you believe one of the sensors is more accurate than the other? What about precise? Explain your reasoning. Percent error: This is the difference between the measured value and the real value divided by the real value. As we may not know the real value, most of the times we will use the accepted or estimated value. The percent error can be written as: The |Measured Value – Accepted Value| means the absolute value between these two numbers; this means to omit the sign. Example: Measuring a 1.5 V battery twice gives the following readings: 1.63 V and 1.37 V. Calculate the percent error of each measurement. Mean and Standard Deviation: These are the two most used parameters at the time of evaluating experimental measurements. Mean is the average of the measurements.It indicates the central value at which the values tend to congregate. If we called x each value, the mean is notated as x. It can be calculated as: Standard Deviation is an indication of the spread of the individual measurements around the mean. Standard deviation is typically notated using the Greek letter Sigma (? ). Standard deviation for a set of values (x) can be calculated as: Let’s see what this means. The part (x - x ) indicates the difference between each one of the measurements and the mean. Each one of these number is squared. The symbol ? means summation, so we will add those values. The total result will be then divided by the number of measurements minus 1 and finally, we calculate the square root of the result. Example: Let’s calculate the mean and standard deviation of the gas pressure experiment using sensor 1. As you remember , the set of values is as follows: Sensor 1: 9.8 10.0 10.3 9.7 9.9 10.1 9.8 IMPORTANT NOTE Most of today’s handheld calculators and spreadsheet programs can perform calculations of mean, standard deviation and other statistical parameters. Other than for answering Question 3, you can use these tools for the rest of this lab as well as for calculations in future labs. If you are not familiar on how to do this, it is now a good time to dust off the calculator’s user manual or search for how to do these calculations in the spreadsheet you are using. QUESTION 3 Calculate the mean and standard deviation from the values using Sensor 2. Show all your work step by step. Sensor 2values: 9.3 9.5 8.6 9.0 8.9 9.2 8.5 QUESTION 4 If we were able to perform totally accurate and precise measurements, what would be the standard deviation in these conditions? QUESTION 5 By inspecting the mean and standard deviation values from Sensor 1 and Sensor 2, what can you say about the accuracy of each sensor. What about its precision? PROCEDURE Since this is the first lab experience, we will work with a set of given data rather than taking the data yourself. The data in the table below corresponds to measurements taken during a free-fall experiment. At different time intervals the experimenter measures the distance of the object from its initial point as it falls down. The experiment is repeated 5 times (5 trials). Distance (y) at different time intervals in free-fall experiment Trial 1 Trial 2 Trial 3 Trial 4 Trial 5 Time (s) Y1 (m) Y2 (m) Y3 (m) Y4 (m) Y5 (m) 0.00 0 0 0 0 0 0.50 1.0 1.4 1.1 1.4 1.5 0.75 2.6 3.2 2.8 2.5 3.1 1.00 4.8 4.4 5.1 4.7 4.8 1.25 8.2 7.9 7.5 8.1 7.4 QUESTION 6 Calculate the Mean (Y) and Standard Deviation for each time completing the table below. Distance (y) at different time intervals in free-fall experiment Trial 1 Trial 2 Trial 3 Trial 4 Trial 5 Mean Std. Dev. Time (s) Y1 (m) Y2 (m) Y3 (m) Y4 (m) Y5 (m) (Y (m)) ? 0.00 0 0 0 0 0 0.50 1.0 1.4 1.1 1.4 1.5 0.75 2.6 3.2 2.8 2.5 3.1 1.00 4.8 4.4 5.1 4.7 4.8 1.25 8.2 7.9 7.5 8.1 7.4 QUESTION 7 Using the spreadsheet or plotting program of your choice, plot (Y) vs. t (that is, plot (Y) in the vertical axis and t in the horizontal axis. LABORATORY REPORT Create a laboratory report using Word or another word processing software that contains at least these elements: Introduction: what is the purpose of this laboratory experiment? Description of how you performed the different parts of this exercise. At the very least, this part should contain the answers to questions 1-7 above. You should also include procedures, etc. Adding pictures to your lab report showing your work as needed always increases the value of the report. Conclusion: What area(s) you had difficulties with in the lab; what you learned in this experiment; how it applies to your coursework and any other comments.
Edwin Hubble's discoveries in the 1920s led to the understanding that the Milky Way is not the only galaxy in the Universe. In a 2 to 3 paragraph essay, describe the five types of galaxies within Hubble classification system. Select one of the galaxy types and search online for an example. Include a picture of your example galaxy.
