HESI A2
HESI A2 Physics Practice Test Questions
Question 1 of 5
What is the kinetic energy of a 500-kg wagon moving at 10 m/s?
Correct Answer: C
Rationale: The formula for calculating kinetic energy is KE = 0.5 mass velocity². Given the mass of the wagon is 500 kg and the velocity is 10 m/s, we can substitute these values into the formula: KE = 0.5 500 kg (10 m/s)² = 0.5 500 kg 100 m²/s² = 25,000 J or 2.5 10â´ J.
Therefore, the kinetic energy of the 500-kg wagon moving at 10 m/s is 2.5 10â´ J.
Choice A (50 J) is incorrect because it is too low;
Choice B (250 J) is incorrect as it does not match the correct calculation;
Choice D (5.0 10^5 J) is incorrect as it is too high. The correct answer is C (2.5 10^4 J).
Question 2 of 5
When a crane hoists a massive object at a constant velocity compared to lifting the same object gradually, the work done by the crane is:
Correct Answer: C
Rationale: The work done by the crane is identical in both scenarios. Work is defined as the force applied over a distance. Since the force needed to lift the object is equal to its weight and the displacement is the same, the work done is identical, whether the object is lifted gradually or at a constant velocity.
Choice A is incorrect because the work done is the same in both cases.
Choice B is incorrect as well since the work done does not increase.
Choice D is incorrect as the mass of the object does not affect the work done by the crane in this scenario.
Question 3 of 5
What force was applied to the object that was moved if 100 Nâ‹…m of work is done over 20 m?
Correct Answer: A
Rationale: Work is calculated using the formula Work = Force x Distance. Given that 100 Nâ‹…m of work is done over 20 m, we can rearrange the formula to solve for Force. Force = Work / Distance. Plugging in the values, we get Force = 100 Nâ‹…m / 20 m = 5 N.
Therefore, the force applied to the object that was moved is 5 N.
Choice B (80 N) is incorrect because it doesn't match the calculated force of 5 N.
Choice C (120 N) is incorrect as it is higher than the calculated force.
Choice D (2,000 N) is incorrect as it is significantly higher than the correct force of 5 N.
Question 4 of 5
A 110-volt appliance draws 0 amperes. How many watts of power does it require?
Correct Answer: A
Rationale: When a 110-volt appliance draws 0 amperes, it means that the power consumption is zero as well. The formula to calculate power is P = V x I, where P is power in watts, V is voltage in volts, and I is current in amperes. Since the current is 0 amperes, the power required by the appliance is also 0 watts.
Therefore, the correct answer is 0 watts.
Choice B, 108 watts, is incorrect because there is no current drawn.
Choice C, 112 watts, and choice D, 220 watts, are incorrect as well since the appliance is not consuming any power when drawing 0 amperes.
Question 5 of 5
Certain non-Newtonian fluids exhibit shear thickening behavior. In this case, the fluid's viscosity:
Correct Answer: C
Rationale: When a non-Newtonian fluid exhibits shear thickening behavior, its viscosity increases with increasing shear rate. This means that as more force is applied to the fluid, its resistance to flow also increases, resulting in a higher viscosity. This phenomenon is opposite to shear thinning, where viscosity decreases with increasing shear rate.
Therefore, in the case of shear thickening behavior, the correct answer is that the fluid's viscosity increases with increasing shear rate.
Choices A, B, and D are incorrect because shear thickening behavior specifically involves an increase in viscosity with increasing shear rate, not remaining constant, decreasing, or depending on applied pressure.