Master Physics with Fun Quizzes & Brain Teasers!

An electric kettle has a power rating of 2.4kW. How long does it take the kettle to heat up 4.5kg of tap water from 28C to 100C ? (c of water = 4200Jkg1C-) What assumption must you make to arrive the answer ?pls helppp....
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Three objects move with a velocity of 1 m/s what is the total kinetic energy of the system?
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what components make up fire
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The half life of Po-218 is three minutes. How much of a 2.0 gram sample remains after 15 minutes? Suppose you wanted to buy some of this isotope, and it required half an hour for it to reach you. How much should you order if you needed to use 0.10 gram of this material?
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ill give brainliest, help!!An applied force of 10.0 N is applied to a 2.0 kg mass over a distance of 4.0 m. Thesurface is horizontal and friction is negligible. Assume that te object is initially at rest.(a)(b)Calculate the work done on the object.Calculate the final speed of the object.
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help me plzzz. ill give brainliest!!!1. In the 1950's, an experimental train that had a mass of 2.50 x 10* kg, was powered acrossa level track by a jet engine that produces a thrust of 5.00 x 10' N for a distance of 5.00 x107 m. What is the final speed of the train if there was no friction?2. A hockey puck is accelerated, using a hockey stick, over a smooth, level ice surface. Thepuck has a mass of 0.400 kg and is moved by the stick for a distance of 0.800 m. Whatwas the average force applied to the puck if the final speed is 25.0 m/s?
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What does a vector consist of?
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How much work must be done to stop a 925-kg cartraveling at 95 km/h?
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A 3 kg model airplane is traveling at a speed of 33 m/s. The operator then increases the speed up to 45 m/s in 2 seconds. How muchforce did the engine need in order to make this change?
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The graph below represents the relationship between speed and time for an object moving along a straight line. What is the total distance traveled by the object during the first 4 seconds
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A triangular plate abc should have side ab 4 cm , side bc 6 cm and the internal angle between sides ab and bc equal to 60 degrees. What is the approximate measurement in cm that will result for the side ac?.
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Plss help me answer this
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Help plsss I need to answer this
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A blue toy train has a mass of 2 kg and moves to the right at a velocity of 1 m/s initially. A red train with a mass of 1 kg moves to the left at a velocity of -1 m/s initially. When the trains collide the blue train experiences an impulse of - 0.6 kg m/s. What impulse does the red train experience?
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Whats the answer pls
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Thesuper hero Flash uses 500 J of energy to complete one lap of the track in 5 seconds. What is the runner'spower?
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It takes 35 J to push a large box 5 m across a floor.Assuming the push is in the same direction as themove, what is the magnitude of the force on thebox?a. 5N b. 7N c. 35 N d. 175 N e. none ofthe above
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how is horsepower relative to the power use of a phone or light bulb?
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QUICK HELP ILL MARK U BRAINLIEST_____can be used to calculate how much energy is being wasted or lost. I
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Explain what is meant by the term dispersion in the context of a waveguide.
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what happens when a magnet passes through a closed loop of wire? A) an electric current is generated in the wireB) any nearby magnets gain an electric charge C) the looped part of the wire no longer is attracted to magnetsD) any device in the circuit becomes a permanent magnet
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True or false? An object that is accelerating is always speeding up or slowing down.
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True or false? An object at rest has an instantaneous acceleration of zero.
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True or False? Instantaneous acceleration is always changing
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