A student wants to test the effects of type of exercise on heart rate. What would be a proper hypothesis?

Question

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Exercise increases heart rate
If exercise affects heart rate, jumping jacks will increase heart rate the most
Jumping jacks will cause the highest heart rate
If type of exercise affects the heart rate of a person, then jumping jacks will increase the heart rate the most
A student is planning an experiment to find out how the height from which he drops a ball affects how high the ball bounces. The dependent variable is the _____.
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Diameter of the ball
Height that the ball bounces
Force acting on the ball
Height from which the ball is dropped
Which month showed the largest decrease in total imports over the previous month?
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Captionless Image
February
March
April
May
What was the difference (in thousands of tons) in coil and sheet steel in the first 3 months of the year? (Use the graph above.)
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10
16
18
20
During an investigation, Rachel placed two spoons in a pan of water on a heated hot plate. One spoon was made of wood and the other was made of metal. After several minutes, the metal spoon became much hotter than the wooden spoon. This most likely happened because:
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Both are good thermal conductors.
The wooden spoon was larger, therefore harder to heat.
Wood reflects thermal conduction.
Wood is a good insulator; metal is a good conductor.
Based on Figure 2, when was the current in the circuit flowing counterclockwise?
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Captionless Image
2 msec
6 msec
10 msec
15 msec
Based on Figure 2 below, on average, where was the brightest surface soil found?
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Captionless Image
At the coastal line
50 km inland
100 km inland
150 km inland
A period is the amount of time it takes a wave to complete one full cycle. Using Figure 3, the period for VL was:
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Captionless Image
2 msec
10 msec
15 msec
20 msec
The foods listed in Figure 1 are listed in order of the percent by mass of proteins, lowest to highest. As the percent of mass of proteins increased, the mass of food remaining at 28 hr:
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Captionless Image
decreased only
increased only
decreased and then increased
increased and then decreased
Jane is setting up an experiment involving bean plants. She places a bean inside a damp paper towel, then places it inside a Ziploc bag. She takes another bean but places it inside a dry paper towel. She tapes both Ziploc bags to her classroom window next to each other. She checks each day to observe and record the data. Jane is most likely invesitgating which hypothesis:
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Beans cannot grow in a paper towel.
What does a bean look like once it's sprouted?
Amount of sunlight affects how fast beans grown.
A dry bean grows quicker than a damp bean.

Answer 1

1. Proper Hypothesis: The most appropriate hypothesis for the student's experiment on the effects of type of exercise on heart rate is:

   • If type of exercise affects the heart rate of a person, then jumping jacks will increase the heart rate the most.

2. Dependent Variable: The dependent variable in the student's experiment regarding how the height from which he drops a ball affects how high the ball bounces is:

   • Height that the ball bounces.

3. Largest Decrease in Total Imports: Since the image is missing, I cannot provide a specific answer. However, you would look for the month with the greatest drop from the previous month in the data presented.

4. Difference in Coil and Sheet Steel: Again, without the graph provided, I cannot accurately provide the answer. You would determine the difference in thousands of tons based on the values shown on the graph for coil and sheet steel for the first 3 months of the year.

5. Reason for Temperature Difference Between Spoons: The reason the metal spoon became much hotter than the wooden spoon is:

   • Wood is a good insulator; metal is a good conductor.

6. Current Flowing Counterclockwise: Without the image referenced in Figure 2, I cannot provide a specific answer. You would refer to the figure to determine at what time interval the current flowed in a counterclockwise direction.

7. Brightest Surface Soil: Without the figure, I cannot provide a specific answer. You would have to look at the figure to determine the average location where the brightest surface soil was found.

8. Period for VL: As the specific image is missing, I cannot provide an answer. You would use Figure 3 to determine the period for VL based on the wave cycle.

9. Mass of Food with Increasing Proteins: Without the figure mentioned in Figure 1, I cannot accurately provide an answer. You would analyze the data to determine how the mass of food remaining at 28 hr changes as the percent by mass of proteins increased.

10. Hypothesis Jane is Investigating: Based on Jane's setup with the bean plants and the conditions of the paper towels, she is most likely investigating the hypothesis:

• A dry bean grows quicker than a damp bean.

If you need specific answers for any of the questions that require images or data, please ensure to provide those visuals or datasets.