HESI A2 Physics Quizlet

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: A

Rationale: The correct answer is A, P = ρgh. This is derived from the hydrostatic equation, which states that pressure in a static fluid at a depth h is directly proportional to the density of the fluid (ρ), gravitational acceleration (g), and depth (h). Therefore, P = ρgh is the correct formula to calculate pressure in a static fluid. Choice B, P = γh, does not include the density of the fluid and is incorrect. Choice C, P = μgh, introduces a new variable μ which is not part of the hydrostatic equation and is thus incorrect. Choice D, P = bh, does not include the density of the fluid or gravitational acceleration, making it an incorrect formula for calculating pressure in a static fluid.

Correct Answer: B

Rationale: The correct answer is B: Momentum. Momentum is not considered a fundamental energy type because it is a property of moving objects, not a form of energy itself. Thermal energy (A), sound energy (C), and chemical energy (D) are all fundamental energy types as they represent different forms of energy that can be converted into other forms. Thermal energy is the internal energy of an object due to its temperature, sound energy is caused by vibrations in a medium, and chemical energy is stored in the bonds of chemical compounds. Momentum, on the other hand, is a measure of an object's mass and velocity, not a distinct form of energy.

Correct Answer: C

Rationale: To calculate current, we use the formula I = P/V, where P is power in watts and V is voltage in volts. In this case, the power is 780 watts and the voltage is 120 volts. Therefore, I = 780/120 = 6.5 amperes. Choice C is correct. Choice A (660 amperes) is incorrect as it is an unrealistic and excessively high value for current in this scenario. Choice B (150 amperes) is incorrect as it does not align with the calculated value using the formula. Choice D (0.15 amperes) is incorrect as it is the decimal form of the correct answer but not expressed in amperes.

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.