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Physics answers to 85 questions
Three properties of air are: a. Air is a homogeneous mixture of gases that combine to become colorless and odorless. However, air consists of dust particles, chippings of other matter, other impurities, and waste. b. Air has a mass of…
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Temperature is a continuous variable and not a discrete variable. This is because while the values of a discrete variable is gotten by counting data, the values of a continuous variable are obtained by measuring provided data. Temperature can be…
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The sum of an object's kinetic and potential energy is referred to as the mechanical energy of the object. Also known as the total mechanical energy (TME), it relates to the sum of the energy an object possesses while moving…
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At a wavelength of 92.05nm, n=1 When n=10 transferring of an electron to level 10, (n2 = sqrt (Rl/Rl - 1) = 10); At a wavelength of 901.3nm, transferring electron from 10th level to level 3 (n1 = sqrt (100…
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To maintain a star's internal thermal pressure, two processes are involved: nuclear fusion and gravitational contraction. Nuclear fusion within the star implies that the nucleus of hydrogen atoms combines to form the nucleus of one or more larger ones. When…
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A sheet or web supported by springs in a metal frame and used as a springboard is called a trampoline. The three main parts of a trampoline are the metal frame for keeping the form together, the springs for extra…
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Average velocity over an interval is a change in position divided by time. Average velocity = Δx / Δt vavg = (x1 - 1) / (t1 - t0)
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The specific heat capacity of ice is 2.108kJ/kgK, water - 4.200 kJ/kgK, steam - 1.996 kJ/kgK.
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You should you the following energy equation: E = n * h * ν h = Planck's constant = 6.62607004 × 10-34 m2 kg / s So, dividing the energy by Planck's constant will give you the number of photons emitted per…
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Correct answer is D - both balls have the same electrical charge.
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It can be calculated this way: As can be seen on the picture, there're three mole of green (P1) P1 = 0.63 atm = 2*3 atoms P2 = 5 moles of diatomic orange P3 = 6 moles of diatomic blue…
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The correct answer is 0 - zero net forces act on the object. Explanation: According to Newton's second law, "the object acceleration is directly proportional to the net force and inversely proportional to its mass". The mass of this object…
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The correct option is B. Explanation: Any object feels weightless in the earth satellite, since it is in a state if freefall towards the Earth. The satellite is moving in the orbit with extremely high speed, so, both the satellite…
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It's 8. Let’s break it down. Let's count the number of electrons in the H2CO molecule: H=1, but 2(1) =2 C = 4 = 6 Total = 12 Let's get the diagram with carbon in the middle, bonded to H,…
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The aspect of life that would most likely be impacted by the absence of George Westinghouse's invention is the distribution of electricity. George Westinghouse was an American inventor who died March 12, 1914. He was the first to adopt the…
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The radius of the earth is the straight distance from the earth’s center to a point on its surface. This value is between 6,378 km, particularly around the equator and about 6,357 km at the poles. However, for purposes of uniformity and…
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The freezing point of water is 0 Celsius (°C), which is considered to be 273 Kelvin (K). In scientific circles, room temperature ranges between 20°C and 25 °C, averaging about 23 °C. Therefore, room temperature in Kelvin can be adding 273…
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The solar system comprises planets and other bodies. Jupiter is the largest planet of all that exist in the solar system hence the comparison with the sun. It is the fifth from the sun and quite massive reaching a size…
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The moon has a lower gravitational pull than that of the earth. It is approximated that gravitational pull on the moon is 1/6th of the earth’s gravitational pull. In that case, people will weigh less on the moon, basically, 1/6th…
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Constellations are beautiful sights to behold. These groups of stars form patterns that look like pictures. Orion is one such constellation among others like Leo the Lion and Taurus the Bull. Just like other constellations, Orion is a pattern that…
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A light year, in astronomy, is the distance which light traverses during one standard Earth year. Just calculate how many hours there are in one year and multiply this quantity by 1080000000, and you will receive the distance in kilometers.…
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The reaction equation 2O3 → 3O2 x+y=20 3/2 x+y=29 Thus, 1/2 x=29-20=9 So, x=2(9)=18. y=20-18=2. The volume % of Oxygen gas in real mixture is 2/20 100%=10%.
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Let t1 be 2s, t2 be 5s The velocity after 2 seconds is V=a ∙ t1 V=4∙2=8(m/s) The final velocity is equal to velocity after 2 seconds, because during last 5 seconds the velocity was constant. So the answer is: The final…
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B. The faster movement is, the more kinetic energy it has. So It's True (T) C. - True (T) as atoms are constantly moving D. Kinetic energy is the energy of motion. Atoms are in a constant move, so they…
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There are three different ways 3D printers work but they all rely on the printer converting a design into individual 2D slices which are then combined to make the final 3D object. The first method uses a pool of chemicals…
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