Lesson 17 : ACT Science Mastery

Lesson 17 : ACT Science Mastery

Multiple Choice

In Method 1, Z=?

• X-Y

• X

• X+Y+Z

• X+Y

The correct answer is D.

Test each equation by plugging in the data from the 25 mil/hr row of Table 1. Only D is true

Multiple Choice

Compared to X at an initial speed of 25 mi/hr, X at a speed of 75 mi/hr is:

• greater

• smaller

• the same

• none of the above

The correct answer is A.

According to Table 1, X at 25 mi/hr is 28 ft, while X at 75 mi/hr is 84 ft. 

Multiple Choice

Compared to Y at an initial speed of 148 ft/ sec, Y at an initial speed of 20 ft/sec is

• greater

• smaller

• the same

• none of the above

The correct answer is B.

According to Table 1, Y at 148 ft/sec is 450 ft, while Y at 20 ft/sec is not on the graph but will be smaller than Y at 36 ft/sec.

Multiple Choice

Compared to Z calculated by Method 1 for initial speed of 110 ft/sec, Z calculated by M 1 for an initial speed of 148 ft/sec is:

• greater

• smaller

• the same

• none of the above

The correct answer is A.

According to Table 1, Z at 110 ft/sec is 359 ft. while Z at 148 ft/sec is 562 ft.

Multiple Choice

According to Figure 1, if the initial speed is 125 mi/hr, what is the best estimate for the total stopping distance according to Method 1?

• 400ft

• 600ft

• 750ft

• 200ft

The correct answer is C.

Extend the line labeled Method 1 as well as the initial speed markers at the bottom of the graph. The best estimate for this point on the line is 750. 

Multiple Choice

According to Figure 1, if the initial speed is 125 mi/hr, what is the best estimate for the total stopping distance according to Method 2?

• 400ft

• 600ft

• 750ft

• 200ft

The correct answer is A.

Extend the line labeled Method 2 as well as the initial speed markers at the bottom of the graph. The best estimate for this point on the line is 400.

Multiple Choice

At what initial speed does Method 1 predict a shorter stopping distance than Method 2?

• 50 mi/hr

• 25 mi/hr

• 75mi/hr

• 100 mi/hr

The correct answer is B. 

Z using Method 1 at 25 mi/hr is only 53 ft. while Z using Method 2 at 25 mi/hr is 72ft

Multiple Choice

At what initial speed does Method 2 predict a shorter stopping distance than Method 1?

• 10 mi/hr

• 25 mi/hr

• 36 mi/hr

• 50 mi/hr

The correct answer is D.

According to Table 1, at speeds of 50 mi/hr and over, Method 2 predicts a lower stopping distance than Method 1. A, B, and C are all speeds under 50 mi/hr and so are incorrect. D is the best answer. Z using Method 1 at 50 mi/hr is 156 feet, while Z using Method 2 at 50 mi/hr is 148 ft. 

Multiple Choice

Define Catalyst:

• something which can be dissolved into another liquid or aqueous

  solution.

• a substance that speeds up a chemical reaction but does not change the

  outcomes of the reaction..

• the green pigment present in plants that captures light energy for

  photosynthesis.

Multiple Choice

Define Chlorophyll:

• the green pigment present in plants that captures light energy for

  photosynthesis.

• the amount of time it takes for molecules or atoms of a material to

  spread from an area of high concentration to an area of lower concentration.

• a substance that is naturally deposited somewhere.

Multiple Choice

Define Coherent:

• to find the exact cause and explanation of an event, phenomena, result

  (in an experiment), etc.

• the amount of time it takes for molecules or atoms of a material to

  spread from an area of high concentration to an area of lower concentration.

• logical and consistent with the preceding arguments, theories, or

  policies.

Multiple Choice

Define Correspond:

• to agree or correlate with; to communicate by exchanging messages.

• logical and consistent with the preceding arguments, theories, or

  policies.

• a high-temperature reaction involving fuel and an oxidant (usually

  oxygen), commonly associated with the process of burning.

Multiple Choice

Define Combustion:

• a substance that speeds up a chemical reaction but does not change the

  outcomes of the reaction.

• a high-temperature reaction involving fuel and an oxidant (usually

  oxygen), commonly associated with the process of burning.

• to treat something or recognize it as different.