Master Physics with Fun Quizzes & Brain Teasers!

What magnification will be produced by a lens of power 4.10 D (such as might be used to correct myopia) if an object is held 22.5 cm away?
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In the diagram below the mass on the incline is 4.0 kg and the hanging mass is 5.0 kg.The pully is frictionless and the string and pully are massless. The incline makes a 40with the horizontal. The acceleration of the hanging mass is 1.50 m/s2. What is thetension on the string and the coefficient of friction between the incline and the mass onit?
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An object is moving in a circle of radius 2 m at a constant speed of 5 m/s. What is its acceleration?
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A rock thrown horizontally from the roof edge of a 10.9 m-high building hits the ground below, a horizontal distance of 14.4 m from the building. What is the overall speed of the rock when it hits the ground?
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A small boy is playing with a ball on a stationary train. If he places the ball on the floor of the train, when the train starts moving the ball moves toward the back of the train. Discuss and explain this observation in terms of what you have learned about Newton's Laws.
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A leftward force of 50 N is applied to an 8 kgobject to move it across a rough surface with aleftward acceleration of 5 m/s/s. Determine thegravitational force, normal force, frictionalforce, net force, and the coefficient of frictionbetween the object and the surface.
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13. A roller coaster is moving at a speed of 39 m/s. How much time does it take to stopwhile accelerating at -6 m/s2?
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A 50 ohm resistor in a circuit has a current flowing through it of 2.0 A. What isthe power dissipated by the resistor? (Use P-OVI - R=V)OA. 25 WOB. 100 WC. 200 WOD. 50 W
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A point on a spinning record experiences a centripetal acceleration of .75 cm/s^2 . How far is the point from center of the record if the record spins at 0.5 revolutions per second?
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What is the potential energy of a 3kg ball that is on the groundPotential Energy = Weight x HeightWeight = Potential Energy / HeightHeight = Potential Energy / WeightWeight = Mass x 10Mass = Weight / 10
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Which properties describe elements that are nonmetal gases? Select all that apply.A)composed of an extended structureB)composed of individual atoms or diatomic moleculesC)high melting pointD)low melting pointE)strong attractions between particlesF)weak attractions between particles
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Which arrow indicates the direction of gravitationalforce on the object, represented by the black dot?B.Which arrow indicates the direction of centripetalforce on the object, represented by the black dot?
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Which of the following is NOT a characteristic of parallel circuits? Select one:a.the same voltage in every branch of the circuit b.allows for loads and appliances to be used independently c.the same current in all branches of the circuit d.many pathways for electric current
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Tom Cogwagee Longboat, of the Six Nations of the Grand River, is one of Ontarios best known distance runners. In 1907, he set a new Boston Marathon record, beating all of the previous decades champions by almost 5 minutes! If he ran the 39.2 km course in 2 hours, 24 minutes and 24 seconds, what was his speed? HINT: well need our units to be metres per second - what do you need to convert in the question?A. 0.221 m/sB. 0.272 m/sC. 4.52 m/sD. 17.5 m/s
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When there is no torque acting on a body, its angular momentum is constant.Question 9 options:TrueFalse
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An unknown radioactive element decays with a half life of 0.440 days. What is the decay constant for the element? Express your answer in 1/day.
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Which statement is true about newtons first law of motion? 1) according to legend newton formulated the law seeing an apple fall to the floor2) it restated the ideas of aristotle 3) it was an addition to and improvement of galileos observation 4) it was completely invented by newton
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A uniform door weighs 70.0 N and is 1.20 m wide and 2.60 m high. What is the magnitude of the torque due to the doors own weight about a horizontal axis perpendicular to the door and passing through a corner?
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018You weigh 740 N.What would you weigh if the Earth weretwo times as massive as it is and its radiuswere four times its present value?
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A motorcycle traveling at 25 m/s accelerates at a rate of 6 m/s/s for 6 seconds. What is the final speed of the motorcycle in m/s? Round your answer to a whole number.
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its about Sankey diagram
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A box of weight W = 500 N is set on a light plank d = 5 meters from a fulcrum. A force F is applied to the plank on the opposite side of the fulcrum a distance D = 10 meters from the fulcrum, as shown. What minimum force is required to lift the box?
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An air conditioner uses 10,832 J of energy to run, but only 5,488 J of energy is used to heat or cool the air of a home. What is its energy efficiency?
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Two capacitors of 4 F and 8 F are connected in parallel. What is the equivalent capacitance of this system?3 F17 F12 F9 F
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