Physical Science A

The correct answer is 1991 because it corresponds to the lowest point on the graph, indicating the smallest number of pennies found in that year.

To convert scientific notation to conventional notation, move the decimal point to the right by the exponent value.

The main branches of natural science are typically categorized into life science (biology), physical science (physics and chemistry), and Earth science (geology, meteorology, astronomy).

Pure science focuses on expanding knowledge through experimentation and observation rather than direct application or problem-solving.

Radio telescopes are used to detect and study celestial objects by receiving radio waves emitted by them. They are essential in observing the oldest and most distant objects in the solar system due to their ability to detect radio waves from sources far away in space.

In the scientific method, the first step is usually making an observation to gather information and identify a problem to be solved.

To find the area of a rectangle, you multiply the length by the width. In this case, 4 x 102 cm * 2 x 103 cm = 8 x 105 cm2.

In physics, weight is the force exerted on an object due to gravity pulling it towards the center of the Earth. Mass refers to the amount of matter in an object, density is the mass per unit volume, and velocity is the rate of change of position of an object.

The SI unit for measuring temperature is kelvin. Celsius, Fahrenheit, and Rankine are also commonly used units for temperature measurement, but only kelvin is the SI unit.

Physicists use particle accelerators to smash atoms in order to study their properties at high energies and understand the fundamental particles that make up our universe.

A scientific theory is not merely an idea or belief but rather a well-substantiated explanation that has been rigorously tested and supported by empirical evidence.

The SI prefix 'mega-' represents one million, while 'kilo-' represents one thousand, 'giga-' represents one billion, and 'tera-' represents one trillion.

Critical thinking in science involves the ability to think logically and analytically to evaluate evidence and solve problems. It is about using reason and evidence to make informed decisions.

When determining significant figures, the answer should reflect the smallest number of decimal places from the measurements given. In this case, the length measurement has the smallest decimal places (3), so the answer should be rounded to that same decimal place, resulting in 2 significant figures.

A scientific model is designed to represent real events or objects in a way that helps us understand and make predictions about the natural world.

Most scientific questions are developed based on observations, which lead to formulating hypotheses, conducting experiments, and refining theories in the pursuit of knowledge.

A spectroscope is specifically designed to separate light into its different wavelengths, creating a rainbow-like spectrum. Telescopes and microscopes are used for magnifying objects, while a barometer measures atmospheric pressure.

The SI system is considered consistent because it is used worldwide, providing a unified measurement system for international communication and collaboration.

To convert millimoles to moles, divide by 1000 since 1 mol = 1000 mmol. Therefore, 1,250 mmol = 1,250 / 1000 = 1.25 mol.

A precise measurement refers to one that is close to the true value, indicating accuracy and reliability.

Scientific methods involve a systematic approach to problem-solving based on evidence, observation, and experimentation. Trial and error, guesswork, and intuition do not align with the rigor and reliability expected in scientific processes.

The correct answer can be calculated by finding where the line representing 270 kilometers intersects the x-axis, which corresponds to 6 hours.

The next step after formulating a question in the scientific method is to research and collect data to support or refute the initial hypothesis.

The mass of a computer is typically measured in kilograms due to the larger size and weight of computers compared to smaller objects which may be measured in grams or ounces. Although pounds are also a unit of mass, the metric system which is commonly used in measuring the mass of computers prefers the use of kilograms.

A particle accelerator can be used to study the structure of an atom by colliding particles at high speeds. Microscopes are used to view small objects, telescopes are used to view distant objects in space, and thermometers are used to measure temperature.

When measuring the height of a bookcase, it is usually done in meters, which is a metric unit of measurement commonly used for larger objects like furniture.

When a negative exponent is present, it indicates the reciprocal of the number to the positive power. In this case, 10^-2 is equivalent to 1/10^2 which simplifies to 1/100 or 0.01.

For multiplication and division, the result should have the same number of significant figures as the measured value with the least number of significant figures.

Burning is a chemical reaction that results in the formation of new substances, therefore causing a chemical change. Mixing ingredients, cutting a paper, and shaking a bottle are examples of physical changes.