what happens to the work done on an object when the angle between force and displacement is 90 degrees
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ATI TEAS 7

TEAS 7 science practice

1. What happens to the work done on an object when the angle between the force and displacement is 90 degrees?

Correct answer: B

Rationale: When the angle between the force and displacement is 90 degrees, the work done is given by the formula W = F * d * cos(theta), where theta is the angle between the force and displacement vectors. Since cos(90 degrees) = 0, the work done becomes zero. This means that no work is done on the object when the angle between the force and displacement is 90 degrees. Choice A is incorrect because maximum work is done when the force and displacement are in the same direction (theta = 0 degrees). Choice C is incorrect as minimum work is done when the force and displacement are parallel (theta = 0 degrees), not perpendicular. Choice D is incorrect because work cannot be infinite; it depends on the force, displacement, and the cosine of the angle between them.

2. Identify the INCORRECT function of the liver.

Correct answer: D

Rationale: A) Correct - The liver produces bile, which aids in the digestion and absorption of fats in the small intestine. B) Correct - The liver is responsible for synthesizing blood proteins, including albumin, which helps maintain osmotic pressure in the blood. C) Correct - The liver stores glucose in the form of glycogen and helps regulate blood sugar levels by releasing glucose when needed. D) Incorrect - The liver does not filter waste products from the blood. Instead, the kidneys are responsible for filtering waste products from the blood and excreting them in the form of urine.

3. What is the first thing you should do to help him?

Correct answer: B

Rationale: The first thing you should do to help the student is to provide guidance on how books are arranged in the library, which is by the author's last name, as observed in the science book section. By explaining this system to the student, you empower him to locate the books independently. This approach fosters self-reliance and problem-solving skills. Choice A is incorrect as it delays addressing the immediate need, which is helping the student navigate the library. Choice C is also incorrect as it suggests postponing assistance to a later time. Choice D is not the best course of action as it doesn't directly help the confused student in the moment.

4. Which of the following describes the difference between prokaryotic and eukaryotic cells?

Correct answer: D

Rationale: Eukaryotic cells have a true nucleus that contains the genetic material, while prokaryotic cells lack a true nucleus. Eukaryotic cells also have membrane-bound organelles such as mitochondria, endoplasmic reticulum, and Golgi apparatus, which are absent in prokaryotic cells.

5. What is one feature that both prokaryotes and eukaryotes have in common?

Correct answer: A

Rationale: The correct answer is A: A plasma membrane. Both prokaryotes and eukaryotes share the characteristic of having a plasma membrane that surrounds the cell. While eukaryotes also possess a nucleus enclosed by a membrane and various organelles, prokaryotes lack a nucleus and membrane-bound organelles. The plasma membrane, however, is a universal feature found in all cells, regardless of their classification as prokaryotic or eukaryotic. Choice B is incorrect because only eukaryotes have a nucleus enclosed by a membrane. Choice C is incorrect because prokaryotes have limited organelles compared to eukaryotes. Choice D is incorrect as a nucleoid is a region in prokaryotic cells where the genetic material is located, not a common feature shared with eukaryotes.

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