Question 1

Which of the following best describes the process by which scientific theories are developed and refined?

Accepted Answer

Theories are developed from observations, make predictions, and are refined when predictions are tested against new data.

Question 2

A bridge design is being reviewed by both architects and engineers. Why is clear communication between these professionals essential according to physics principles?

Accepted Answer

To prevent structural failure by accurately calculating load-bearing forces.

Question 3

Which statement about scientific models is most accurate?

Accepted Answer

Models provide mental pictures to help visualize abstract concepts, but their limitations must be acknowledged.

Question 4

A student measures a board as $$45.6 \pm 0.2 cm. $$What is the percent uncertainty in this measurement?

Accepted Answer

$$0.4\%$$

Question 5

When multiplying $$6.4 cm by$$ $$2.15 cm$$, which answer is correctly expressed with the proper number of significant figures?

Accepted Answer

$$13.8 cm$^2$$

Question 6

Which of the following is NOT a base unit in the SI system?

Accepted Answer

Gram

Question 7

Express $$0.0035$$ meters using the most appropriate SI prefix.

Accepted Answer

$$3.5 mm$$

Question 8

Convert $$7.5$$ kilometers to meters.

Accepted Answer

$$7500$$\ m

Question 9

A car travels at $$65$$ miles per hour. What is this speed in meters per second? (Given: $$1$$ mile $$= 1609 m$$, $$1 hr$$ $$= 3600 s)$$

Accepted Answer

$$29$$\ m/s

Question 10

Estimate the number of heartbeats in a human lifetime, assuming a heart rate of $$70$$ beats/min and a lifespan of $$70$$ years. What is the best order of magnitude estimate?

Accepted Answer

$$10^9$$ beats

Question 11

Which is the best order of magnitude estimate for the number of seconds in one year?

Accepted Answer

$$10^7$$ seconds

Question 12

Which expression is dimensionally consistent with velocity $$[L/T]$$? (Let $$x = $$position, $$t = $$time, $$a = $$acceleration $$[L/T^2$])$$

Accepted Answer

$$x / t$$

Question 13

The period of a pendulum is given by $$T = 2\pi \sqrt{L/g}$$, where $$L is $$length and $$g is $$acceleration due to gravity $$[L/T^2$]. $$What are the dimensions of $$T$$?

Accepted Answer

$$[T]$$

Question 14

A scientist proposes a new theory. Which criterion is most important for its acceptance?

Accepted Answer

It makes predictions that agree better with data and explains a greater range of phenomena.

Question 15

Which of the following statements about significant figures is correct?

Accepted Answer

When adding or subtracting, the answer is no more accurate than the least accurate number used.

Question 16

Which of the following is a correct use of dimensional analysis?

Accepted Answer

Checking that the solution to a physics problem has the correct dimensions.

Question 17

A measurement is recorded as $$0.062 cm. $$How many significant figures does this value have?

Accepted Answer

2

Question 18

Which scenario best illustrates the importance of physics in the life sciences?

Accepted Answer

Calculating the force required for a muscle to lift a bone in human physiology.

Question 19

A student needs to convert $$8611$$ meters to feet. Given $$1 m$$ $$= 3.28084 ft$$, what is the height in feet?

Accepted Answer

$$28251 ft$$

Question 20

Which of the following best describes a scientific law?

Accepted Answer

A law is a brief description of how nature behaves in a broad set of circumstances.

Chapter 1: Introduction, Measurement, and Estimating – Physics with Calculus Study Notes

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