Physics

Hydrocarbons are by-products of which of the following:a. Fossil oils, mines and fossil fuelsb. Burning fires, water treatment plants and fossil oilsC. Combustion in fossil, lighting and exhaust fumesd. Petrol, sea waves and combustion in vehiclese. Burning fires and combustion in factories and vehicles
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What is the mass of a mallard duck whose speed is 9.1 m/s and whose momentum has a magnitude of 12 kgm/s?
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PLEASE HELP! I'LL GIVE BRAINLEST
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In the process of fluorescence, a molecule in its ground state will absorb a photon with a certain energy Eex, called the excitation energy, and then emit a photon with energy Eem, the emission energy. Obviously, the molecule cannot emit more energy than was absorbed.a) You wrote in your notebook that you excited a fluorescent bead at = 640 nm and found that it fluoresced (emitted) at = 520 nm. Or was it the other way around? Do a calculation and see if those figures should be switched.b) You shine a laser on your bead at the excitation wavelength. The laser has a power of 1 mW. How many photons are emitted by the laser in one second?c) You wish to build a microscope that allows you to excite the bead at its excitation wavelength and detect the fluorescence at the emission wavelength. This requires a pair of filters, one that allows only the excitation wavelength to pass through, and the other that allows only the emission wavelength to pass through. What color will these filters appear (i.e. what color light will they transmit?) You may have to look at an electromagnetic spectrum to figure this out
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what happens to the current in a circuit if a 1.5 volt battery is removed and is placed by a 9 volt battery?
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Which statement is true about how early humans met their needs?
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What specific type of tide has the smallest difference between high and low tide?
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What is Force ?.............
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If a virtual image is formed 10.0 cm along the principle axis from a convex mirror of focal length-15.0 cm, how far is the object from the mirror
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Calculate the acceleration of a car if the force on the car is 450 Newtons and the mass is 1300 kilograms.
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A 0.545-kg ball is hung vertically from a spring. The spring stretches by 3.56 cm from its natural length when the ball is hanging at equilibrium. A child comes along and pulls the ball down an additional 5cm, then lets go. How long (in seconds) will it take the ball to swing up and down exactly 4 times, making 4 complete oscillations before again hitting its lowest position
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A 25.0kg girl pushes a 50.0kg boy so that he accelerates at 4.00m/s2. What is the force of the boy on the girl? A. 200N B. 100N C. 12.5 D. 400N
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who won the 2020-2021 Nfl Mvp Award
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Magnetic objects will attract to a magnet even if they are far from it.Yes or No
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A certain type of laser emits light that has a frequency of 4.9 x 1014 Hz. The light, however, occurs as a series of short pulses, each lasting for a time of 2.9 x 10-11 s. The light enters a pool of water. The frequency of the light remains the same, but the speed of light slows down to 2.3 x 108 m/s. In the water, how many wavelengths are in one pulse
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The work done is a vector quantity and SI base unit is J
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A meter is larger than a A. hectometer B. kilometer C. decimeter D. dekameter
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A textbook of mass 2.10 kg rests on a frictionless, horizontal surface. A cord attached to the book passes over a pulley whose diameter is 0.100 m , to a hanging book with mass 3.10 kg . The system is released from rest, and the books are observed to move a distance 1.29 m over a time interval of 0.850 s . Part A What is the tension in the part of the cord attached to the textbook
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Which type of map best shows the three dimensions of Earths surface?
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the ratio between the force of sliding friction and the normal force of an object is called?A. The rolling frictionB. The dragC. The coefficient of frictionD. The starting friction
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Each of these flasks contains the same number of gas molecules. Inwhich container is the pressure highest?Flask 1Flask 2Flask 3Flask 4Flask 3Flask 4Flask 2Flask 1Page
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A 3.9 kg object is on top of a shelf that is 1.5 meters high. The object falls at a velocity of 9.2 m/s. Calculate the kinetic energy of the falling object
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Plz help What factors determinehow the speed of the marbles changes in acollision?
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what do solar winds and the earths magnetic field create
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