HESI Exams Quizlet Physics

Correct Answer: C

Rationale: The correct answer is C: 49 N/cm. To calculate the spring constant, we use Hooke's Law: F = kx, where F is the force applied, k is the spring constant, and x is the displacement from equilibrium. Given F = mg (mass multiplied by gravity) and x = 10 cm = 0.1 m, we can solve for k: k = F/x = mg/x = 5 kg * 9.8 m/s^2 / 0.1 m = 49 N/cm. Choice A is incorrect as it is lower than the correct answer. Choices B and D are incorrect as they are higher than the correct answer.

Correct Answer: C

Rationale: The correct answer is C because when the car hits the ground, all of its potential energy is converted into kinetic energy. As the car falls, potential energy decreases while kinetic energy increases. Therefore, the car does not retain any potential energy when it hits the ground. Choice A is correct as the potential energy at the height can be calculated as mgh (mass x gravity x height). Choice B is correct as potential energy is converted to kinetic energy as the car falls. Choice D is incorrect as the potential energy is first converted to kinetic energy, not directly to sound energy.

Correct Answer: C

Rationale: The correct answer is C: Zero. Inside a hollow conductor with a net charge, the electric field is zero due to electrostatic shielding. Charges within the conductor redistribute to cancel out the electric field inside, resulting in a net zero field. This is a fundamental property of conductors in electrostatic equilibrium. Explanation for other choices: A: Remains constant - Electric field inside a hollow conductor with a net charge does not remain constant; it is zero. B: Decreases - Electric field does not decrease inside a hollow conductor with a net charge; it is zero. D: Becomes unpredictable - The electric field inside a hollow conductor with a net charge is predictable and known to be zero due to redistribution of charges.

Correct Answer: B

Rationale: The correct answer is B because as a raindrop falls, air resistance increases, counteracting the force of gravity. Initially, gravity pulls the raindrop down, causing it to accelerate. However, as the raindrop gains speed, air resistance becomes stronger, eventually balancing out the gravitational force. This results in a constant velocity rather than acceleration. A: Gravity does pull the raindrop down, but it doesn't do so at a constant rate. The acceleration due to gravity is constant but is countered by air resistance. C: The mass of the raindrop remains constant as it falls, so its mass decreasing is not a factor in its speed. D: Objects in motion do not necessarily decelerate over distance; in the case of the raindrop, air resistance prevents further acceleration.

Correct Answer: B

Rationale: Step-by-step rationale for choice B (Repulsion to magnetic fields) being correct: 1. Diamagnetic materials create small, weak opposing magnetic fields when in the presence of an external magnetic field. 2. These opposing fields cause repulsion between the material and the external field. 3. This repulsion is a characteristic feature of diamagnetism, distinguishing it from other types of magnetism. 4. Therefore, choice B is correct. Summary of why other choices are incorrect: A: Diamagnetic materials are not attracted to magnetic fields, so this choice is incorrect. C: Diamagnetic materials do not amplify magnetic fields, so this choice is incorrect. D: Diamagnetic materials do not show indifference to magnetic fields but rather exhibit repulsion, making this choice incorrect.