Experiments Questions and Answers

Which statement describes a characteristic of an experimental design that will improve the quality of the results? A. It has more than one manipulated variable. B. It involves a procedure that is complex. C. It has a small sample size of test subjects. D. It has a single responding variable.

Suppose the temperature is 75 °F at NYC and 60 °F at Boston, 240 miles away. Suppose the wind is blowing directly from NYC towards Boston at 16 mph. Suppose further that the vertical turbulent heat flux is as follows at Boston: Height above ground 1000m 500 m surface Flux -0.04 Km/s +0.01 Km/s +0.06 Km/s What will the new temperature be at Boston if these conditions continue for 1 hour? What kind of boundary layer would this be? Make whatever reasonable assumptions you need to, and be sure and explain your work. Watch out for units!! If the wind were blowing from Boston to NYC (the opposite direction), with everything else the same, what would your answer be? What kind of boundary layer would this be now?

What is the result of 1.58 ÷ 3.793 written with the correct number of significant figures? 4.166 x 10-1 O 4.1656 x 10-1 O 4.2 x 10-1 O4 x 10-1 O 4.17 x 10-1

3. What is the Joly photometer made of? Two pieces of plastic and tinfoil. Two pieces of glass and tinfoil. Two blocks of paraffin wax and tinfoil. Two blocks of salt and tinfoil.

Which of these is way that the newer generation of immigrants tried to make their transition to life in a new nation easier? a Moving to rural areas to escape nativism b Forming their own political parties to advocate for their rights c Abandoning their culture in order to become true Americans d Settling in urban ethnic enclaves

An auditorium has dimensions 37 m x 15 m x 39 m. How many molecules of air fill the auditorium at 40 °C and pressure of 100 kPa? Assume air is an ideal gas. Note: Write the unit: molecules

How did the decision to strike most impact the city? A. Some union workers lost their jobs. B. Some parents were inconvenienced. c. Thousands of students had trouble getting to school. D. The strike earned national attentionl

How do two bits of unrubbed paper interact? If we were to assume that the behavior of unrubbed paper is due to the presence of a third charge, would the behavior of this third charge be consistent with thebehavior of A and B?

The specific heat capacity of aluminum is 0.22cal/g °C, How close was your experimental value to the theoretical value? Provide at least two sources of error as if you performed this lab in person.

A scientist monitors the number of eggs in five duck nests in parks, five duck nests in zoos, and five duck nests in the wild during the spring and summer for three years. He makes a multiple line graph to plot and compare data for the three locations. Which question describes what the scientist is most likely testing? (A)How many eggs do ducks usually lay? (B)What color of ducks lays the most eggs? (C)What setting is best for producing the most eggs? (D)Where is the safest place to raise ducks?

An airplane is headed south at speed 400 km/h. The airplane encounters a wind from the east blowing at 100 km/h. (A) How far will the airplane travel in 3 h? (B) What is the direction of the airplane?

You are spending the summer interning as a technical advisor for the writers of a gangster movie about Bonnie and Clyde. In one scene Bonnie and Clyde try to flee from one state to another. In the script, Bonnie is driving down the highway at 108 km/hr, and passes a concealed police car that is 1 km from the state line. The instant Bonnie and Clyde pass the patrol car, the cop pulls onto the highway and accelerates at a constant rate of 2 m/s². The writers want to know if they make it across the state line before the pursuing cop catches up with them.

A well-known result from ecology and evolution is the species-area relationship, which says that the number of species S living in a confined area A scales as A2, where the value of the exponent z depends on the nature of the confined area. For oceanic islands, which have a clear boundary and well-defined area, z≈ 0.33. Suppose island B is 1/100 th the size of island A. If island A has 400 species, how many species do you predict for island B? Express your answer as a number of species.

2. Press play and watch the video above. Listen to the sound of the horn as it passes Will and Amani who are standing by the side of the road. Which of these is true? The horn sounds different to Will and Amani when the car is approaching compared to when it is moving away. The horn sounds the same to Will and Amani when the car is approaching compared to when it is moving away.

3. Click Change on the video and select Inside Car as the cameral location. Watch and listen to the view inside the car where Charlise is holding the car horn, Which of these is true? The sound inside the car does not change as the car drives past Amani and Will. The sound inside the car changes as the car drives past Amani and Will.

5. Which statement best describes how the black spectrum of the car horn when it is stationary compares to the red spectrum of the car horn when it is approaching the recording equipment? When the car is approaching the recording equipment, the red spectrum is shifted to the right compared to when the car horn is stationary. When the car is approaching the recording equipment, the red spectrum is not shifted compared to when the car horn is stationary. When the car is approaching the recording equipment, the red spectrum is shifted to the left compared to when the car horn is stationary.

1. On the lower right corner of the video you can see an image of a graph called the spectrum of the sound of the car horn. The spectrum shows that the car horn is made up of dozens of sounds, each represented by a vertical line, called a peak, on the spectrum. Take a close look at the spectrum. What is the longest wavelength where the car horn spectrum has a peak? Hint: If you are having trouble reading the vertical axis, you can switch the video to full screen using the button on the lower right of the player

7. Here is a spectrum for a car horn a student recorded while the car was moving in red with the horn's stationary spectrum in black: Is the car approaching the recording equipment or moving away from the recording equipment? The car is approaching the recording equipment. The car is moving away from the recording equipment. There is no way to tell which way the car is moving.

Next, we'll analyze the data to find the mathematical model for brightness as a function of distance. 1. Describe the shape of the graph, and say what this tells us about the how the brightness changes with distance.

2. Linearize your data by creating a calculated column. Explore different relationships until you find one that results in a linear distribution of data points on your graph. Describe your process and results below.

5. How could you change the slope of your graph? Use a different home galaxy Stretch the rubber sheet faster Use the same home galaxy, but measure to a different set of galaxies

Activity A: Proton-proton chain Get the Gizmo ready: . Click Reset. . Be sure Proton-proton is selected in the Reaction menu. nucleus? Proton Neutron Introduction: All stars turn hydrogen into helium in a process called nuclear fusion. Stars perform this process in different ways. In stars like our sun, the proton-proton chain is used. This reaction requires temperatures greater than 4,000,000 K to occur. Question: How does the process of fusion turn hydrogen into helium in stars? 1. Observe: Click Fire proton and observe. What happens after the proton merges into the This is a form of nuclear decay called positron emission. During positron emission, a proton decays into a neutron. In this process, it emits a positron, which is a nearly massless antimatter particle with a positive charge. Focus

Following the instructions above, play the video and pause when the brightness from the bulb shining on the lower wax block is the same as the brightness of the sun's light on the upper block. Use the ruler tool to measure the distance from the bulb to the middle of the wax blocks. 1. Play the video. Pause the video and move the scrub bar at the bottom of the video until the lower wax block and upper wax block appear to me the same color. 2. Use the ruler to help you determine the r from the light source. (Remember to measure to the center of the blocks, which is where the two blocks meet). Your r should be where the distance away from the light source produces the same level of brightness on the top and bottom of the wax blocks.

Valentina has chosen the following main points for her speech on event planning: Chronological pattern problem-solution pattern spatial pattern topical pattern cause-effect pattern

Priya's speech has these three main points: Have an appropriate number of main points. Phrase main points clearly. Select main points that are mutually exclusive. State main points as declarative sentences. All main points should relate to the topic.

What are the interesting features of each planet? 1. Observe: Look closely at the diagram of planets. Based on the diagram, list the planets from smallest to largest:

Most planets are surrounded by layers of gas called an atmosphere. Click on each planet and read about it. Focus on information about each planet's atmosphere. A. Of the rocky planets, which have well-developed atmospheres?

Measure: Click Reset (). Now you will measure how long it takes each planet to orbit the Sun. Notice that the date shown below the simulation is today's date. Drag an arrow from the left of the Gizmo and place it next to Mercury. Click Play. When Mercury completes one orbit (reaches the arrow), click Pause. Record Today's date and the One orbit date in the first row of the table below. Do the same steps for each planet, filling in the table as you go. For the outer planets, zoom out (-) and increase the Speed of the simulation.

In this lab you will use a virtual spectrometer, like those found within telescopes or space probes, to analyze astronomical bodies in space. Record your hypothesis and spectrometric results in the lab report below. You will submit your completed report to your instructor. Use this Electromagnetic Spectrum Lab Report as you complete this virtual lab activity. You will submit your completed report. Review the grading rubric before you begin.

Which of the following objects is not at constant velocity? A parked car. A car moving at constant speed down a straight highway. A car moving at constant speed around a curve. A. A car moving at constant speed around a curve. B. A car moving at constant speed down a straight highway. C. All are moving at constant velocity. D. None are moving at constant velocity. E. A parked car.

This NASA footage shows the Atlas V rocket launching the Mars Science Laboratory (aka Curiosity Rover). This rocket launched the Curiosity rover on its 8.5 month long journey to Mars. The first part of the trip was to use the ATLAS V rocket to launch the rover into orbit around earth. The first few seconds of this trip are shown in the video below. 1. Let's start by calculating what acceleration the rocket must produce to launch into earth orbit. In order to attain orbit around earth, the ATLAS V rocket must accelerate up to a speed of about 7700 meters per second in about 4.2 minutes. What average acceleration is required to accomplish this? (acceleration = velocity/time)

During a conference to address developmental needs, child care providers should follow all EXCEPT which of the following guidelines? A. Explain your observations in a tactful, honest manner B. Present available options to the parents C. Avoid being positive, as it may give the parents false hope D. Be sensitive and understanding to the parents' reactions

Which of the following is a basic safety tip when teaching children to keep food safe? A. Combine food when preparing it to make cooking easier B. Wash hands and food preparation surfaces often C. Food that looks good is always good to eat D. Germs only live in hot temperatures

Sound moves through air at a speed of 340 m/s. How long would it take to hear your echo in a canyon which is 50 meters away? Show all of your work with an explanation of your answer. (You can work this out on paper, take a picture, and upload the picture by clicking on the picture icon)

A+1.70 μC point charge is sitting at the origin. What is the distance between the 1000 V surface and the 1500 V surface?

You are standing on the ground at the origin of a coordinate system. An airplane flies over you with constant velocity parallel to the x axis and at a constant height of 6.90 x 103 m. At t = 0, the airplane is directly above you so that the vector leading from you to it is Po = 6.90 x 10³ m. At t = 30.0 s the position vector leading from you to the airplane is P30 = (7.30 × 10³î + 6.90 × 10³ĵ) m as suggested in the figure below. Determine the magnitude and orientation of the airplane's position vector at t = 65.0 s. magnitude

The formulas are: V = vo + at x = vot + ½ at^2 V^2 = vo^2 + 2ax Try this one: "a car is moving at 6 m/s when it speeds up at 2 m/s^2 for 3 s. Find the velocity at the end of the problem" First: Find out what we already know vo = 6 m/s a = 2 m/s^2 • t = 3 s Second: figure out what we want to find out V = ? Third: find a formula that has those four variables - vo, a, t and v Fourth: if the problem needs to be algebraically solved for the missing variable, do it. Then plug in the numbers and solve.

If the left half of your brain is injured, what activities are MOST LIKELY to become affected? A. your ability to play the piano B. your ability to complete a puzzle C. your ability to paint a picture D. your ability to ride a bike

A data set includes wait times (minutes) for the Tower of Terror ride at Walt Disney World's Hollywood Studios theme park at 5:00 PM. Using 35 of the times to test the claim that the mean of all such wait times is more than 30 minutes, the accompanying Excel display is obtained. Test the given claim by using the display provided from Excel. Use a 0.01 significance level. Click the icon to view the Excel display. Identify the null and alternative hypotheses.

A rocket blasts off and moves straight upward from the launch pad with constant acceleration. After 2.9 s the rocket is at a height of 92 m. What is the magnitude of the rocket's acceleration? Express your answer using two significant figures. What is the direction of the rocket's acceleration? upward downward