Master Physics with Fun Quizzes & Brain Teasers!

Explain why distance has a larger impact on the gravitational force between two objects than mass does.
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Explain how a formula 1 car demonstrates the Doppler effect
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while standing at the edge of a cliff 45m high, you drop a ball. When the ball has fallen 5m, you throw a second ball straight down. What initial speed must you give the second ball if they are both to reach the ground at the same time?
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Are all resistance ohmic in nature?
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When 2.0 x 10^-16 kilogram of matter is converted into energy, how much energy is realeased?
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The equation below can be used to find the specific heat capacity of a substance. What is the specificheat capacity if it takes 1,000J of energy to heat 25g of this substance by 100C? Give your answer inJ/kgC.
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find the weight of 5 kg potato
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See attachment for the question
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Myopia is caused when the (a) eye lens becomes thick (b) eye lens becomes thin (c) eye ball becomes shorter then the normal size (d) none of the above
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Can someone please explain to me why the direction at the final answer is said to be left.
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why does a combination of red, yellow and blue paint look black?
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A gold bar has dimensions 1.5 inches by 4 inches by 9.2 inches. What is the mass of the gold bar in grams? Kilograms? Recall the density of gold is 19.3 g / cm^3, and there are 2.54 cm in 1 inch.
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In a closed system that has 560 J of mechanical energy, the gravitational potential energy of a weight being lowered by a pulley decreases from 250 J to 175 J. How does the systems kinetic energy change if there is no friction?
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HiA stone of mass 2.0kg is attached to one end ofstringed of length 1.5m, if the stort is swung round in ahorizontal circle at 1 rev/sec, Calculate the tension in theSpring. [take ^314
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When vectors B+A=5i-j and B-A=i-7j, what is the magnitude and direction of vector A?
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Which of the following divisions of time is NOT based on an orbital property of the Earth, Sun, and Moon?1 The year 2 the Month 3 the day
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An electric heater rated 220V and 2.2KW works for 3 hours. Find the energy consumed and the current drawn by it. [Ans: 2.376 107J.
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At the time of Copernicus, what was the strongest argument against the heliocentric or Sun-centered model of the Solar System?The fact that the earth does not seem to be in motion Telescopic observations showing that the solar system orbits were not circular The fact that Mars has episodes of retrograde motion The fact that Venus shows phases
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50 N60 degVasIn the figure above, 50 Newtons of Force are pushing at a downward 60 degree angle as shown,The part of the force parallel to the ground is 25 Newtons. If the lawnmower is pushed 20 metersin a straight line what work is done by the force pushing the mower?O 500 JO 250 J1000 J60 J
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!!!!100 POINTS!!!! Select a time span from the list below. 1500 - 1600 1600 - 1700 1800 - 1900 1920 - 1940 1950 - 1970 1970 - 1990 1990 - present Research astronomy during that time and create a timeline of important events. You may use several materials to create your timeline, including a roll of paper, construction paper, or the computer. Be sure your timeline is accurate, legible, and visually appealing. Choose the event you believe had the greatest impact and write a 150 word summary supporting your opinion. Upload your timeline and summary in the box below. Astronomy Timeline
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Which statement is true of a mechanical wave?
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an electric kettle of rating 2.5kW. calculate the amount of energy consumed in 5 minutes
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Why does a siren have a lower pitch as it moves away? ( I need a answer quick !)A) The amplitude of the sound wave is increasedB) The period of the sound wave is decreasedC) The crests of the sound are farther apartD) The troughs of the sound wave are spaced closer together
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A skydiver jumps out of a hovering helicopter, so there is no forward velocity. Ignore wind resistance for this exercise. What is the skydiver's acceleration?
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