HESI Exams Quizlet Physics - Nurselytic

Correct Answer: C

Rationale: When the car falls to the ground, its potential energy is converted to kinetic energy as it accelerates downwards. Upon impact with the ground, the car's kinetic energy is dissipated in various forms, such as sound energy, heat, and deformation energy.
Therefore, the car does not retain its initial potential energy of 367.5 kJ when it hits the ground.
Choice A is true because the potential energy of the car can be calculated as mgh = 1500 kg * 9.8 m/s^2 * 25 m = 367,500 J = 367.5 kJ.
Choice B is true because as the car falls, its potential energy is converted to kinetic energy.
Choice D is true as the kinetic energy is eventually dissipated into other forms upon impact.

Correct Answer: B

Rationale: The period is the time taken for one complete vibration of the guitar string.
To find the period, you need to take the reciprocal of the frequency. Since the string makes 80 vibrations in one second, the period is 1/80 = 0.0125 seconds (or 0.025 s).
Choice A is incorrect because it is the reciprocal of 80.
Choice C is incorrect as it is 10 times the reciprocal of 80.
Choice D is incorrect as it is 100 times the reciprocal of 80.

Correct Answer: A

Rationale: The correct equation relating heat transfer (Q), mass (m), specific heat capacity (c), and change in temperature (ΔT) is Q = mcΔT. This equation states that the heat transfer is equal to the product of the mass, specific heat capacity, and temperature change.
Therefore, the correct answer is B, as it correctly represents this relationship.

Choices C and D do not correctly represent the relationship between these quantities and are therefore incorrect.

Correct Answer: C

Rationale: The spring constant (k) can be calculated using Hooke's Law formula: F = -kx, where F is the force applied, k is the spring constant, and x is the displacement from equilibrium. In this case, the force applied is equal to the weight of the block, F = mg, where m = mass of the block = 5 kg and g = acceleration due to gravity = 9.8 m/s^2. The displacement x = 10 cm = 0.1 m. Substituting the values, we have: 5 kg * 9.8 m/s^2 = k * 0.1 m. Solving for k gives k = 5 * 9.8 / 0.1 = 49 N/m.
Therefore, the spring constant for this spring is 49 N/cm.
Choice A (4.9 N/cm) is incorrect because it is one decimal place lower than the correct answer.
Choice B (9.8 N/cm) is incorrect as it does not account for the correct calculation based on the given information.
Choice D (50 N/cm) is incorrect because it is slightly higher than the accurate value obtained through the calculations.

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.