HESI A2
HESI Exams Quizlet Physics Questions
Question 1 of 5
The drag force (F_d) experienced by an object moving through a fluid depends on:
Correct Answer: B
Rationale: The drag force experienced by an object moving through a fluid depends on multiple factors, including the object's shape, size, velocity, and the fluid's properties such as viscosity and density.
Choices A, C, and D are incorrect because drag force is not solely determined by the object's shape and size, depth of submersion, or buoyant force acting on the object. The primary factors affecting drag force are the fluid properties and the object's velocity.
Therefore, the correct answer is B.
Question 2 of 5
Archimedes' principle explains the ability to control buoyancy, allowing:
Correct Answer: C
Rationale: Archimedes' principle states that the upward buoyant force acting on an object submerged in a fluid is equal to the weight of the fluid displaced by the object. Submarines control their buoyancy by adjusting the volume of water they displace, which allows them to submerge and resurface.
Choice C is correct because it directly relates to the principle of buoyancy and how submarines utilize it.
Choices A, B, and D are incorrect because they do not accurately reflect the application of Archimedes' principle in controlling buoyancy for submergence and resurfacing.
Question 3 of 5
A 0-kg block on a table is given a push so that it slides along the table. If the block is accelerated at 6 m/s2, what was the force applied to the block?
Correct Answer: A
Rationale: According to Newton's second law of motion,
F=ma. Since the block has a mass of 0 kg, the force applied must be 0 N, as no force is needed to move an object with zero mass.
Question 4 of 5
A constant force is exerted on a stationary object. In this scenario, work is:
Correct Answer: B
Rationale: Work is only done when a force causes displacement. Since the object is stationary, no displacement occurs, and therefore, no work is performed.
Choice A is incorrect because work requires both force and displacement.
Choice C is incorrect as there is no partial work - work is either done or not done.
Choice D is incorrect as the scenario provided is clear - the object is stationary, so no work is being performed.
Question 5 of 5
Two objects attract each other with a gravitational force of 12 units. If you double the distance between the objects, what is the new force of attraction between the two?
Correct Answer: A
Rationale: The gravitational force between two objects is inversely proportional to the square of the distance between them. If the distance is doubled, the force will be reduced to 1/4 of the original force.
Therefore, the new force of attraction between the two objects will be 12 units / 4 = 3 units.
Choice A is correct because doubling the distance reduces the force to 1/4 of the original value.
Choices B, C, and D are incorrect as they do not consider the inverse square relationship between distance and gravitational force.