Experiments Questions

Physics

Experiments Solutions

Natália is using ___ in her speech when she says, "In state after state where spending on education went up, crime went down." (A)deductive reasoning (B)inductive reasoning (C)causal reasoning (D)reasoning by analogy

Physics

Experiments Solutions

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?

Physics

Experiments Solutions

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?

Physics

Experiments Solutions

An object is subjected to an acceleration a = 4 + 3v. It is given that the displacement S = 0 when v = 0. The value of displacement when v = 3 m/s is: 1. 1+(4/3)ln(13/4) 2. 1-(4/3)ln(13/8) 3. 1-(4/9)ln(13/4) 4. 1+(4/9)ln(13/8)

Physics

Experiments Solutions

Part A Fish can adjust their buoyancy with an organ called the swim bladder. The swim bladder is a flexible gas-filled sac; the fish can increase or decrease the amount of gas in the swim bladder so that it stays neutrally buoyant-neither sinking nor floating. Suppose the fish is neutrally buoyant at some depth and then goes deeper. What would happen to the volume of air in the swim bladder if the fish didn't change the amount of air in it? O The volume of air would decrease because of the decreasing pressure. O The volume of air would increase because of the increasing pressure. O The volume of air would decrease because of the increasing pressure. O The volume of air would increase because of the decreasing pressure. Submit Request Answer Part B Will the fish need to add or remove gas from the swim bladder to maintain its neutral buoyancy? O The fish will need to add gas, otherwise the fish will go deeper with decreasing speed. O The fish will need to remove gas, otherwise the fish will go deeper with decreasing speed. O The fish will need to remove gas, otherwise the fish will go deeper with increasing speed. O The fish will need to add gas, otherwise the fish will go deeper with increasing speed.

Physics

Experiments Solutions

For each measurement of the period, you should measure at least three times, take the average and also calculate the standard deviation to use as a measure of the uncertainty. In addition, to decrease the uncertainty of the measurement, you should measure the period of 10 oscillations and then divide by 10. This will make the reaction time, which contributes to the uncertainty, a smaller percentage of the actual measurement. It is also useful for one student to release the pendulum and another person to time the measurement. However, if the student releases the pendulum and simultaneously tells the student timing to start the stopwatch, this introduces another uncertainty. Instead, the student with the stopwatch should let the pendulum swing through one oscillation before starting the stopwatch. This will decrease the uncertainty in the measurement. Investigation 1.1 Follow your procedure from Exploration 2 and the measurement procedure described above. Test the three variables of mass, amplitude of the swing and length of the string to see, if they influence the period. You should choose at least three different values for each of the variables being tested. (So use three different masses, if you are testing mass, etc.) The variables not being tested should be held constant. For example, if you test length first, the mass and amplitude will be held constant for all measurements of length. Because it is difficult to return to a previous length, the length should be measured first or last. There is a table available on the next page to record your data. For every measurement, repeat the measurement at least three times and record the mean and standard deviation of those measurements. 3 Mass Number of washers 1 washer = 28.2 g 1 Amplitude of swing = 10° , Length =42.5 cm Measurement Average and Uncertainty in seconds 1.31 1.28 1.32 1.30 1.33 1.33 1.32 1.30 1.3.2 2 3 Amplitude of swing Degrees Length = 42.5 cm Average and Uncertainty 10 Mass = 1 washer Measurement 1.31 1.28 1.32 1.31 1.31 1.31 1.36 1.33 1.33 15 20 Length 10º, Mass = 1 washer Average and Uncertainty cm 95.7 Amplitude of swing = Measurement 1.93 1.96 1.95 1.64 1.65 1.62 1.31 1.28 1.32 64.8 42.5

Physics

Experiments Solutions

Exploration 1 Among your group members, discuss what variables could influence the period of a pendulum. In the space below, list three or four variables your group agrees upon, along with possible reasons for your choosing those variables. Discuss your list with your TA before continuing. 1 Exploration 2 Explain how you will determine if a variable affects the period of the pendulum. Suppose, for example that you are testing to see if the mass of the bob affects the period. How would you set up the experiment? What would have to be kept constant? What would be allowed to change? How many masses would you need to test? If the mass does affect the period, would it be possible to determine a mathematical relationship between the mass and the period? Exploration 3 How would you measure the period? Would there be uncertainty in the measurement of the period? How could you minimize that uncertainty?

Physics

Experiments Solutions

Question 9 < > B0/1 pt 53 99 0 Details A disease spreads through a population. The number of cases t days after the start of the epidemic is shown below. Days after start (t) Number infected (N(t) thousand) 60 10 69 12 Assume the disease spreads at an exponential rate. How many cases will there be on day 86? thousand (Round your answer to the nearest thousand) On approximately what day will the number infected equal sixty-nine thousand? (Round your answer to the nearest whole number) Question Help: Video Written Example Add Work Submit Question Jump to Answer

Physics

Experiments Solutions

4. Based on your answer to these questions, which of these do you think is correct? The sound of the horn in changing as the car drives. People in the car or by the road hear the same changes in sound. The sound of the car horn sounds different to someone standing by the side of the road, but the sound produced by the horn does not change for someone in the car. Submit Answer unlimited submissions remaining Score: 0/1

Physics

Experiments Solutions

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 o m Submit Answer unlimited submissions remaining Score: 0/ 1 ho viden

Physics

Experiments Solutions

submissions remaining Score: 1/ 1 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. Submit Answer 2/2 submissions remaining Score: 0/1

Physics

Experiments Solutions

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. Submit Answer 2/2 submissions remaining Score: / 1