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Physics answers to 85 questions
The freezer is too cold. Ice crystals in meat occur when air comes in contact with the meat. When meat is frozen there would be a couple of water molecules from the meat that would end up forming ice crystals.…
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A. A set of mathematics topics that is relevant to introductory physics courses. The physics primer is not defined as the online comprehensive mathematics textbooks. Physics Primer consists of tutorials, videos, and answers to specific questions, the main idea is…
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As unrelated as both concepts seem, there is a fundamental connection between them. As observed in the molecules of an atom, when there is an increase in temperature, the molecules of the atoms begin to vibrate rapidly and move erratically,…
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Answer: B. Low. The light and heat generated by the sun are absorbed by the water as soon as it hits the surface and is only retained by the first few meters of the ocean's water. Also, the colder and…
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Answer: Swedish astronomer, Carl Charlier. In the 20th century, Charlier developed a cosmological model that described the cosmos as an intricate system, arranged hierarchically. According to Charlier, the cosmos is arranged in scales that grow larger as each cluster is…
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An energy source is a medium through which energy can be obtained in any form, and through any process (conversion or transformation, directly, etc.). A generator produces energy, a solar cell converts the sun's energy into another form, a battery…
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The sun is a giant ball of gasses that is in constant motion, and it produces energy through the process of nuclear fusion. Here, two protons (hydrogen atoms) moving at very high speeds collide with each other, forming a helium…
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When light travels through a medium or from one medium to another, its direction is bound to change, and this change is what forms the basis for the difference between reflection and refraction. Reflection occurs when the light returns back…
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Going by the word "poly" meaning "many" or "numerous", a polyatomic ion refers to an ion that is made up of at least two atoms. The atoms on a polyatomic ion are most often bound by covalent bonds, and based…
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The electromagnetic spectrum comprises all the ranges of wavelengths of every electromagnetic radiation or electromagnetic wave. The waves are arranged in order of frequencies and wavelengths. The waves are microwaves, radio waves, x-rays, visible light, ultraviolet, infrared, and gamma rays.…
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Kinetics refers to the science of deciphering the reason behind the types of motion, while kinematics refers to the science of understanding and explaining how objects move, with respect to, acceleration, position, etc. In kinetics, the cause of motion is…
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Answer: 5. Aluminum. Explanation: The ionization energy of an atom is the amount of energy required to remove an electron from a mole of atoms while in the gas phase. The second ionization energy is the energy required to remove a second electron, to…
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Answer: D. Conservation of energy. Explanation: The first law of thermodynamics states that energy (matter) can neither be created nor destroyed, but can be converted from one form to another. This means that regardless of the physical or chemical processes…
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Answer: C. The phosphate portions attract water, and the lipid portions repel water. Explanation: Every phospholipid molecule has two elements: the head (or the phosphate group), and two tails (two chains of fatty acids that lie side by side). The…
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A real gas behaves like an ideal gas when there's an increase in temperature with a decrease in pressure. At this point, there is a reduction in the intermolecular collision, resulting in a reduction in the potential energy of the…
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Answer: C. The temperature of the gas. Explanation: The average molecular kinetic energy of a gas is directly proportional to the temperature of the medium containing the gas. As the temperature of the gas increases, the molecules of the gas…
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Metals are good conductors of electricity because of the kind of bond that exists between their molecules. The molecules of metals are held together by a metallic bonding. As such, the atoms of metals are encased by a horde of…
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Answer: A. From the south pole to its north pole. Explanation: When referring to the direction of a magnetic field, it is assumed towards the north pole as recorded by the compass needle. By convection, therefore, the field lines begin…
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Although both words are often used interchangeably in physics, there are a number of differences between them. Pressure is used when referring to the amount of force that is applied to a given area as regards the surface area of…
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For every metric measurement that is done, one must first understand the importance of the density of the said liquid. That being said, if one has 1 liter of water it would weigh exactly 1000 grams (or 1 kilogram) because…
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Solution: E = 1400 N/C, The electron's initial speed (V1) = 0ms, M = 9.11x10^-31 kg, Q = 1.60x10^-19 C. 1. F (electric force exerted on the electron) is expressed as: F = Eq A (magnitude of the acceleration of…
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Solution: A) The potential energy contained in a proton that is positively charged from 5.0v potential location to 7.5v potential location will increase. This is due to the fact that energy is expended on the proton within an electric field…
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When using the lens equation, a real object has a positive object distance – choice B. The lens equation is a vital topic in the study of optics and physics in general. It helps in the quantification of the relationship…
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Answer: A. Still air. For anything to be able to conduct heat properly, it has to have its molecules packed closely together while vibrating vigorously. All the molecules of water are closely packed together, so water is a good conductor…
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At 0°, water exists in a solid state as ice. At normal atmospheric temperature, water exists in a liquid form. 0°C is the freezing point of pure water. At that temperature, the structure of the water molecules begins to change.…
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A converging lens is one that focuses (converges) light rays as they come towards the lens. A diverging lens is one that diverges separates or scatters light rays as they come towards the lens. Converging lenses are thicker towards the…
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An elastic collision occurs when the sum of the kinetic energy of a moving object is equal to the sum of the kinetic energy of the object after collision with another object. An inelastic collision occurs when there is a…
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The temperature where °C and F have the same value is at -40°. Explanation: The formula for converting temperature from Celsius scale to Fahrenheit scale is thus: °C = (F - 32) times (5/9), while the conversion from Fahrenheit to…
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In physics, magnitude refers to the dimensions of an object or quantity when compared to its motion. These dimensions include the size of the object or quantity, its direction, etc. In the example 10km/hr, 10 is the magnitude of speed…
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Air is regarded as a mixture rather than a compound. All its components can be separated by distilling liquid air. Also, air exhibits the individual properties of its component gases, something that can be shown by its different boiling temperatures.…
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