HESI A2 Physics Quizlet

HESI A2 Physics Quizlet Related

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Jon walks all the way around a rectangular park that is 1 km 2 km. Which statement is true about Jon's walk?

  • A. The displacement of his walk is 3 kilometers, and the distance traveled is 0 kilometers.
  • B. The displacement of his walk is 0 kilometers, and the distance traveled is 16 kilometers.
  • C. The displacement of his walk is 6 kilometers, and the distance traveled is 0 kilometers.
  • D. The displacement of his walk is 0 kilometers, and the distance traveled is 6 kilometers.
Correct Answer: D

Rationale: Jon walks all the way around a rectangular park that is 1 km 2 km, which means he walks a total distance of 6 kilometers (1 km + 2 km + 1 km + 2 km = 6 km). However, the displacement of his walk is 0 kilometers because he starts and ends at the same point after completing the rectangular path around the park. Displacement refers to the change in position from the starting point to the ending point, regardless of the actual distance traveled. Choice A is incorrect because the total distance traveled by Jon is 6 kilometers, not 0 kilometers. Choice B is incorrect as the displacement is not 0 kilometers, and the distance traveled is 6 kilometers, not 16 kilometers. Choice C is incorrect because the displacement is 0 kilometers, and the distance traveled is 6 kilometers, not 0 kilometers.

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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.

A 120-volt heat lamp draws 25 amps of current. What is the lamp's resistance?

  • A. 96 ohms
  • B. 104 ohms
  • C. 150 ohms
  • D. 4.8 ohms
Correct Answer: D

Rationale: To find the resistance of the lamp, we use Ohm's Law, which states that resistance (R) is equal to voltage (V) divided by current (I), expressed as: R = V / I. Given that the voltage (V) is 120 volts and the current (I) is 25 amps, we substitute these values into the formula: R = 120 V / 25 A = 4.8 ohms. Therefore, the resistance of the lamp is 4.8 ohms. Choice A, 96 ohms, is incorrect as it is not the result of the correct calculation. Choice B, 104 ohms, is incorrect as it does not match the calculated resistance. Choice C, 150 ohms, is incorrect as it is not the correct resistance value obtained through the calculation.

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.

A pitcher throws a 45-g baseball at a velocity of 42 meters per second. What is the ball's momentum?

  • A. 0.189 kgâ‹…m/s
  • B. 1.89 kgâ‹…m/s
  • C. 1.07 kgâ‹…m/s
  • D. 0.93 kgâ‹…m/s
Correct Answer: B

Rationale: Momentum is calculated by multiplying mass (in kg) by velocity (in m/s). The mass of the baseball is 0.045 kg (45 grams converted to kg), and the velocity is 42 m/s. Momentum = 0.045 kg 42 m/s = 1.89 kgâ‹…m/s. Therefore, the correct answer is 1.89 kgâ‹…m/s. Choice A is incorrect as it incorrectly converts the mass from grams to kg. Choice C and D are incorrect due to calculation errors.

For steady, incompressible flow through a pipe, the mass flow rate (ṁ) is related to the fluid density (ρ), cross-sectional area (A), and average velocity (v) via the continuity equation:

  • A. ṁ cannot be determined without additional information
  • B. ṁ = ρvA
  • C. Bernoulli's principle is solely applicable here
  • D. The equation of state for the specific fluid is required
Correct Answer: B

Rationale: The continuity equation for steady, incompressible flow states that the mass flow rate is the product of the fluid's density, velocity, and cross-sectional area. Hence, ṁ = ρvA. Choice A is incorrect because the mass flow rate can be determined using the given formula. Choice C is incorrect as Bernoulli's principle does not directly relate to the mass flow rate calculation. Choice D is incorrect as the equation of state is not needed to calculate the mass flow rate in this scenario.

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