1.1 Physics: Definitions and Applications
- quantum mechanics and Einstein’s theory of relativity
- quantum mechanics and classical physics
- Newton’s laws of motion and classical physics
- Newton’s laws of motion and Einstein’s theory of relativity
- the strength of gravity within a black hole
- the motion of a plane through the sky
- the collisions of subatomic particles
- the effect of gravity on the passage of time
- Physics explains how energy passes from one object to another.
- Physics explains how gravity works.
- Physics explains the motion of objects that can be seen with the naked eye.
- Physics explains the fundamental aspects of the universe.
- Understanding how cells reproduce is mainly about physics.
- Predictions of the side effects from the radiation therapy are based on physics.
- The devices used for generating some kinds of radiation are based on principles of physics.
- Predictions of the life expectancy of patients receiving radiation therapy are based on physics.
1.2 The Scientific Methods
- Its use requires constructing replicas of the metal wire in the lab.
- It involves analyzing an imaginary system simpler than the real wire it resembles.
- It examines a model, or ideal, behavior that other metals should imitate.
- It attempts to examine the metal in a very realistic, or model, way.
A scientist wishes to study the motion of about 1,000 molecules of gas in a container by modeling them as tiny billiard balls bouncing randomly off one another. Which of the following is needed to calculate and store data on their detailed motion?
- a group of hypotheses that cannot be practically tested in real life
- a computer that can store and perform calculations on large data sets
- a large amount of experimental results on the molecules and their motion
- a collection of hypotheses that have not yet been tested regarding the molecules
- The worker thought it was a nice location.
- because ants may have to find a spot for the queen to lay eggs
- because there may be some food particles lying there
- because the worker ants are supposed to group together at a place.
1.3 The Language of Physics: Physical Quantities and Units
Suppose that a bathroom scale reads a person’s mass as 65 kg with a 3 percent uncertainty. What is the uncertainty in their mass in kilograms?
- a. 2 kg
- b. 98 kg
- c. 5 kg
- d. 0
- a trend that shows an exponential relationship
- something whose value can change over multiple measurements
- a measure of how much a plot line changes along the y-axis
- something that remains constant over multiple measurements
A high school track coach has just purchased a new stopwatch that has an uncertainty of ±0.05 s . Runners on the team regularly clock 100-m sprints in 12.49 s to 15.01 s . At the school’s last track meet, the first-place sprinter came in at 12.04 s and the second-place sprinter came in at 12.07 s . Will the coach’s new stopwatch be helpful in timing the sprint team? Why or why not?
- No, the uncertainty in the stopwatch is too large to effectively differentiate between the sprint times.
- No, the uncertainty in the stopwatch is too small to effectively differentiate between the sprint times.
- Yes, the uncertainty in the stopwatch is too large to effectively differentiate between the sprint times.
- Yes, the uncertainty in the stopwatch is too small to effectively differentiate between the sprint times.