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Question 1 of 10
Many individuals concerned with their carbon footprint are excited about the availability of hybrid electric vehicles. These cars are much more efficient in their use of fossil fuels than similarly sized internal combustion automobiles. However, hybrid electric vehicles do come with an environmental price tag. Their construction uses scarce metals, such as neodymium, lithium and lanthanum. Additionally, mining these elements involves pumping acids into deep boreholes to dissolve the surrounding rock and then removing the acid and mineral slurry. Such extraction processes are a type of surface mining, which have severe environmental impacts such as erosion, acid mine drainage, water pollution, and disruption of habitat.
Based on the passage above, what are the environmental trade-offs of hybrid electric vehicles?
Question 2 of 10
How many calories does someone need to eliminate from their diet in order to lose weight? First they should calculate their basal metabolic rate (BMR) which identifies how many calories they burn each day when at complete rest. After calculating their BMR, they can then use an additional formula to factor in their level of activity. There are seperate BMR formulas for men and womnen, and these formulas require three variables: age, height, and current weight. Here is BMR formula for women:
BMR = 655 + (4.35 × W) × (4.7 x H) − (4.7 × A)
W = Weight in pounds H = Height in inches A = Age
According to the formula, which of the following will result in a lower BMR?
Question 3 of 10
Tonisha is conducting an experiment to determine the effects of watering clover with liquid Vitamin B. One week into her experiment the average clover plant from her control group is 17.3 millimeters tall.
(1 decimeter = 100 millimeters)
Convert this height measurement into meters:
Question 4 of 10
Mechanical advantage is a measure of the force amplification that is achieved by using a tool, mechanical device, or machine system. The formula for mechanical advantage is:
\(MA = \dfrac{\text{output force}}{\text{input force}}\)
A crowbar can be used to remove a nail from a board. If the crowbar has a mechanical advantage of 8, and the a force of 40 Newtons is applied to it, what will be the output force?
Question 5 of 10
Many individuals concerned with their carbon footprint are excited about the availability of hybrid electric vehicles. These cars are much more efficient in their use of fossil fuels than similarly sized internal combustion automobiles. However, hybrid electric vehicles do come with an environmental price tag. Their construction uses scarce metals, such as neodymium, lithium and lanthanum. Additionally, mining these elements involves pumping acids into deep boreholes to dissolve the surrounding rock and then removing the acid and mineral slurry. Such extraction processes are a type of surface mining, which have severe environmental impacts such as erosion, acid mine drainage, water pollution, and disruption of habitat.
Which sentence from the passage above best supports the idea that driving a hybrid electric vehicle burns gasoline?
Question 6 of 10
In a lab experiment designed to test the rate at which plants grow under artificial light, the kind of light used is which type of variable?
Question 7 of 10
An experiment was performed to determine the effect of caffeine on the pulse rate of 20 healthy 20-year-old women. Each woman, in a state of fasting, was given a 250 mL beverage at the same time of day. The women had their pulse rates measured before they consumed the beverage, and then 30 minutes after consuming the beverage. This process was repeated over 5 days, with 5 different beverages. Below are the results:
Beverage Amount of Caffeine (mg/serving) Average pulse at 0 minutes Average pulse at 30 minutes
Water
0
60
60
Caffeine-free soda
0
54
55
Caffeinated soda
10
59
69
Decaffeinated coffee
3
61
66
Regular coffee
45
59
82
After analyzing the data, what is the most appropriate conclusion about the effects of caffeine on the heart rate of healthy 20-year-old women?
Question 8 of 10
A student hypothesizes that eating a teaspoon of raw honey will prevent sneezing in people who are allergic to pollen. She runs an experiment to test her hypothesis. What is the dependent variable?
Question 9 of 10
A computer network is a set of computers connected together for the purpose of sharing resources. Network latency is an expression of how much time it takes for a packet of data to get from one designated point to another. For computer networks to work effectively, it is important to minimize network latency. The following equations can be used to calculate latency:
Which of the following changes would decrease network latency?
Question 10 of 10
Purple flowers, yellow seeds and inflated seed pods are all dominant traits in pea plants. The recessive traits being white flowers, green seeds and constricted seed pods. If a plant that is homozygous dominant for flower color is crossed with a plant that is heterozygous for flower color, what percentage of the offspring will have yellow flowers?
