HESI Exams Quizlet Physics

Correct Answer: A

Rationale: The momentum of an object is calculated by multiplying its mass by its velocity. In this case, for option A, the momentum of the car is calculated as 1,250 kg x 5 m/s = 6,250 kg*m/s. This is greater than the momentum of the other choices. For option B, the momentum of the person is 80 kg x 4 m/s = 320 kg*m/s, which is less than the car's momentum. For option C, the momentum of the meteorite is 10 kg x 600 m/s = 6,000 kg*m/s, which is also less than the car's momentum. For option D, the momentum of the rock is 0.5 kg x 40 m/s = 20 kg*m/s, making it the smallest momentum among the choices. Therefore, the car moving at 5 m/s has the greatest momentum due to its higher mass and velocity compared to the other objects.

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: A

Rationale: Failed to generate a rationale after 5 retries.

Correct Answer: C

Rationale: Failed to generate a rationale after 5 retries.

Correct Answer: C

Rationale: The correct answer is C: Gay-Lussac's law. This law states that the pressure of a gas is directly proportional to its temperature when volume is constant. When a car is driven for a long time, the tires heat up due to friction with the road, causing the air inside to heat up as well. According to Gay-Lussac's law, as the temperature increases, the pressure of the gas also increases. Choice A, Boyle's law, states that pressure and volume are inversely proportional at constant temperature. Choice B, Charles' law, states that volume and temperature are directly proportional at constant pressure. Choice D, Dalton's law, is about the total pressure of a gas mixture being the sum of the partial pressures of the individual gases. These laws do not directly explain why the pressure in the tires of a car increases with driving.