HESI Exams Quizlet Physics

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

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: The drag force experienced by an object moving through a fluid depends on fluid properties (like viscosity and density) and object velocity. This is because the resistance encountered by the object is influenced by how easily the fluid can flow around it and the speed at which it moves through the fluid. The shape and size of the object can affect the drag force, but they are not the only factors determining it. The depth of submersion primarily affects buoyancy, not drag force. The buoyant force acting on the object is related to its weight and the density of the fluid, but it does not directly determine the drag force experienced by the object.

Correct Answer: A

Rationale: To find the current drawn, use the formula: Current (I) = Power (P) / Voltage (V). Substituting the values: I = 60 watts / 110 volts = 0.55 amperes (A). This is the correct answer. Other choices are incorrect as they do not match the calculated value. B: 1.83A, C: 50A, D: 6,600A are all significantly different from the calculated current of 0.55A, thus not the correct answer.

Correct Answer: A

Rationale: To find the current flowing through the flashlight, use Ohm's Law: Current (I) = Voltage (V) / Resistance (R). Given V=3V and R=60Ω, I = 3V / 60Ω = 0.05 amp (A). This is the correct answer. Choice B, 0.5 amp, is incorrect as it does not match the calculated value. Choice C and D, 1.8 amp and 18 amp respectively, are also incorrect as they are significantly higher than the calculated current value and would require a much higher voltage source.