HESI A2 Physics Quizlet

Correct Answer: D

Rationale: To compress the spring from 40 cm to 30 cm, we calculate the change in length = 40 cm - 30 cm = 10 cm = 0.1 m. The force needed is given by Hooke's Law: F = k * x, where F is the force, k is the spring constant (20 N/m), and x is the change in length (0.1 m). Therefore, F = 20 N/m * 0.1 m = 2 N. Choice D (2 N) is correct because it correctly applies Hooke's Law. Choices A, B, and C are incorrect because they do not correctly calculate the force based on the given spring constant and change in length.

Correct Answer: A

Rationale: To find the object's velocity, we use the formula for momentum: momentum = mass x velocity. Given momentum = 180 kg⋅m/s and mass = 45 kg, we rearrange the formula to solve for velocity: velocity = momentum / mass. Substituting the values, velocity = 180 kg⋅m/s / 45 kg = 4 m/s. Therefore, the correct answer is A: 4 m/s. Summary: B: 8.1 km/s and C: 17.4 km/h are incorrect as they do not match the calculated velocity of 4 m/s. D: 135 m/s is incorrect as it is significantly higher than the calculated velocity of 4 m/s.

Correct Answer: D

Rationale: To calculate power, we use the formula P = W / t, where P is power, W is work done, and t is time taken. The correct formula is D: P = F / t. Power is the rate at which work is done, so it is the work done per unit time. Therefore, the correct formula depicts power as the force applied divided by the time taken to do the work. Incorrect choices: A: P = W / F - This formula is incorrect because power is not work divided by force. B: P = d / t - This formula is incorrect because power is not distance divided by time. C: P = W x t - This formula is incorrect because power is not work multiplied by time. In summary, choice D is correct because power is defined as work done per unit time, which is represented by force divided by time.

Correct Answer: C

Rationale: Failed to generate a rationale after 5 retries.

Correct Answer: B

Rationale: To calculate momentum, we use the formula p = mv, where p is momentum, m is mass, and v is velocity. Given mass = 45g = 0.045kg and velocity = 42m/s. Substituting the values, we get p = 0.045kg * 42m/s = 1.89 kg⋅m/s. Therefore, the correct answer is B (1.89 kg⋅m/s). Choice A: Incorrect. 0.189 kg⋅m/s is obtained by incorrectly calculating the product of mass and velocity. Choice C: Incorrect. 1.07 kg⋅m/s is not the correct calculation of momentum based on the given values. Choice D: Incorrect. 0.93 kg⋅m/s is an incorrect calculation and does not represent the momentum of the baseball accurately.