HESI A2 Physics Quizlet

HESI A2 Physics Quizlet Related

Review HESI A2 Physics Quizlet related questions and content

According to the Law of Universal Gravitation, the gravitational force between two objects is directly proportional to what factor?

  • A. the gravitational constant
  • B. the distance between them
  • C. the product of their masses
  • D. the square of the distance between them
Correct Answer: C

Rationale: According to the Law of Universal Gravitation, the gravitational force between two objects is directly proportional to the product of their masses. The equation is: F = G (m₁ mâ‚‚) / r², where F is the gravitational force, G is the gravitational constant, m₁ and mâ‚‚ are the masses of the two objects, and r is the distance between them. Choice A is incorrect because the gravitational constant is a constant value. Choice B is incorrect because the distance between the objects affects the strength of the gravitational force inversely proportional to the square of the distance, not directly proportional. Choice D is incorrect as it represents the inverse square law, where the gravitational force decreases with the square of the distance between the objects.

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If a wave has a frequency of 60 hertz, which of the following is true?

  • A. It completes one cycle per minute.
  • B. It measures 60 m from crest to crest.
  • C. It completes 60 cycles per second.
  • D. It measures 60 m from crest to trough.
Correct Answer: C

Rationale: The frequency of a wave is the number of cycles it completes in one second. A wave with a frequency of 60 hertz completes 60 cycles per second. Therefore, choice C is correct. Choice A is incorrect because a frequency of 60 hertz means 60 cycles per second, not per minute. Choice B is incorrect as the frequency of the wave does not determine the distance from crest to crest. Choice D is also incorrect as the frequency does not relate to the distance from crest to trough.

The Reynolds number (Re) is a dimensionless quantity used to characterize:

  • A. Fluid density
  • B. Flow regime (laminar vs. turbulent)
  • C. Surface tension effects
  • D. Buoyancy force magnitude
Correct Answer: B

Rationale: The Reynolds number is a dimensionless quantity used to characterize the flow regime, specifically whether it is laminar (smooth) or turbulent (chaotic). It depends on the velocity of the fluid, its characteristic length (such as pipe diameter), and its viscosity. A low Reynolds number indicates laminar flow, while a high Reynolds number suggests turbulence. Choices A, C, and D are incorrect because the Reynolds number is not related to fluid density, surface tension effects, or buoyancy force magnitude.

Amanda uses 100 N of force to push a lawnmower around her lawn. If she mows 20 rows measuring 30 meters each, how much work does she do?

  • A. 3,000 Nâ‹…m
  • B. 6,000 Nâ‹…m
  • C. 60,000 Nâ‹…m
  • D. The answer cannot be determined from the information given.
Correct Answer: C

Rationale: The work done by Amanda pushing the lawnmower is calculated by multiplying the force applied (100 N) by the distance over which the force is applied (the total distance mowed). Since Amanda mows 20 rows, each measuring 30 meters, the total distance mowed is 20 rows x 30 meters/row = 600 meters. Therefore, the work done is 100 N x 600 m = 60,000 Nâ‹…m. Option A and B are incorrect as they do not account for the total distance mowed. Option D is incorrect as the work done can be accurately calculated based on the information provided.

In the mechanical power equation P = E / t, power is measured in ___________.

  • A. ohms
  • B. Joules
  • C. volts
  • D. watts
Correct Answer: D

Rationale: In the mechanical power equation P = E / t, power is measured in watts. Watts are the standard unit of power in the International System of Units (SI), named after the Scottish engineer James Watt. Watts are defined as joules per second, reflecting the rate at which energy is transferred or converted. Ohms (choice A) are the unit of electrical resistance, Joules (choice B) are the unit of energy, and volts (choice C) are the unit of electric potential difference. Therefore, the correct answer is watts as it directly relates to power in the given equation.

When light travels from air into a denser medium like glass, its speed:

  • A. Increases
  • B. Decreases
  • C. Remains constant
  • D. Becomes unpredictable
Correct Answer: B

Rationale: When light travels from air into a denser medium like glass, its speed decreases. This is because the higher refractive index of the denser medium causes light to slow down as it propagates through the medium. Choice A is incorrect because the speed of light decreases in a denser medium. Choice C is incorrect because the speed of light changes when it enters a denser medium. Choice D is incorrect because the change in speed is predictable based on the refractive index of the medium.

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