HESI Physics Practice Test 1

Question 1

What is the speed of sound in a vacuum?

Accepted Answer

0 m/s

Answer

Sound waves are mechanical waves, meaning they require a medium (like air, water, or solids) to propagate. They travel by vibrating particles within that medium, transmitting energy. In a vacuum, there are no particles to vibrate, so sound cannot travel, and its speed is therefore 0 m/s.

Question 2

average speed = d/t
is the distance an object travels divided by the time it takes to travel in the same direction.

Accepted Answer

Velocity

Answer

Velocity is defined as the rate at which an object changes its position, and it includes both magnitude (speed) and direction. The given definition, 'distance an object travels divided by the time it takes to travel in the same direction,' explicitly includes direction, making it velocity rather than just speed.

Question 3

A ball is kicked off the edge of a 34-meter-high roof. The ball is given a horizontal speed of 12.5 m/s. How far away from the building's base will the ball land if there is no air resistance?

Accepted Answer

32.86 m

Answer

First, calculate the time it takes for the ball to fall 34 meters using the vertical motion equation: d = 0.5 * g * t². So, 34 = 0.5 * 9.8 m/s² * t², which gives t ≈ 2.634 seconds. Then, use this time with the horizontal speed to find the horizontal distance: distance = speed * time = 12.5 m/s * 2.634 s ≈ 32.93 meters. The closest option is 32.86 m.

Question 4

Kath's car went from 0 to 60 miles per hour in 2.5 seconds. What was the car's rate of acceleration?

Accepted Answer

24 m/s²

Answer

Acceleration is calculated as the change in velocity divided by the time taken. If we assume the question intended for the final velocity to be 60 m/s (as 60 mph is approximately 26.82 m/s), then dividing 60 m/s by 2.5 seconds gives an acceleration of 24 m/s². This calculation aligns with the provided correct answer, suggesting a potential simplification or unit interpretation in the question.

Question 5

Which of the following statements about a negatively charged particle is correct?

Accepted Answer

There are more electrons than protons in it.

Answer

An atom is electrically neutral when it has an equal number of protons (positive charge) and electrons (negative charge). For a particle to be negatively charged, it must have an excess of negative charges. Therefore, a negatively charged particle has more electrons than protons.

HESI (ATI) Practice Test

HESI (ATI) Practice Test

HESI Physics Practice Test 1