HESI Exams Quizlet Physics

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: Sure! Pascal's principle states that a pressure change applied to a confined incompressible fluid is transmitted undiminished throughout the fluid. This is because the fluid transmits the pressure equally in all directions. The other choices are incorrect because: A: Pressure is not amplified, it remains constant. C: The pressure change is not limited by the container size. D: The fluid type may affect other properties, but not the transmission of pressure.

Correct Answer: A

Rationale: The correct answer is A: Q = cΔT. This equation represents the definition of specific heat capacity, where Q (heat transfer) is equal to the product of c (specific heat capacity) and ΔT (temperature change) for a unit mass of the material. This equation is derived from the formula for heat transfer, Q = mcΔT, by dividing both sides by mass 'm'. Therefore, the correct equation is Q = cΔT. Summary of other choices: B: Q = mcΔT - This is the formula for total heat transfer, not specific heat capacity. C: Q = c / mΔT - This equation does not accurately represent the relationship between specific heat capacity, heat transfer, temperature change, and mass. D: Q = ΔT / mc - This equation is not a correct representation of specific heat capacity and does not follow the standard formula.

Correct Answer: B

Rationale: Step 1: Work is defined as the product of force and displacement in the direction of the force. Step 2: In this scenario, the object is stationary, meaning there is no displacement. Step 3: Without displacement, work done is zero. Step 4: Therefore, the correct answer is B: Not performed. Summary: A: Incorrect because work requires displacement. C: Incorrect as partial work implies partial displacement, which is not the case here. D: Incorrect as it is conclusive that work is not performed due to the absence of displacement.

Correct Answer: A

Rationale: To calculate momentum, we use the formula p = mv, where p is momentum, m is mass, and v is velocity. Since momentum is conserved, the momentum of the 2,000-kg car is equal to the momentum of the 1,500-kg car. Setting the two momentum equations equal to each other, we get 2000*15 = 1500*v, where v is the velocity of the 1,500-kg car to generate the same momentum. Solving for v, we get v = (2000*15) / 1500 = 20 m/s. Therefore, to generate the same momentum as the 2,000-kg car, the 1,500-kg car would need to accelerate to 20 m/s. Choice A is correct. Choices B, C, and D are incorrect as changing the mass or a combination of adding mass and velocity will not lead to the 1,500-kg car generating