Master Physics with Fun Quizzes & Brain Teasers!

Matter can undergo chemical reactions and nuclear reactions, which statement is true for both types of reactions? a. the reactants have the same numbers of atoms as the products, b. they conserve mass. c. they involve breaking and making chemical bonds, d. they have reactants and products,
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Question 5 of 25 a cordless drill is used to drill a hole in a wooden board. which of the following energy conversions begins the process that leads to the turning drill bit removing the wood?
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If an aircraft is equipped with a fixed-pitch propeller and a float-type carburetor, the first indication of carburetor ice would most likely be
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A 1 kg block sliding to the right on a level, frictionless surface with a speed of 2 m/s collides and sticks to a second 1 kg block sliding to the left. after the collision, the blocks are motionless. what was the speed of the second 1 kg block before the collision?
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A 75-kg sprinter accelerates from rest to a speed of 11.0 m/s in 5.0 s. (a) calculate the mechanical work done by the sprinter during this time. (b) calculate the average power the sprinter must generate. (c) if the sprinter converts food energy to mechanical energy with an efficiency of 25%, at what average rate is he burning calories? (d) what happens to the other 75% of the food energy being used?
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A boat accelerates uniformly from rest to a speed of 10 m/s over a distance of 50 m. (a) Determine the acceleration of the bike. (b) how long will take to do that? in this 34 A boat accelerates uniformly from rest to a speed of 10 m / s over a distance of 50 m . ( a ) Determine the acceleration of the bike . ( b ) how long will take to do that ?
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Summarize a black hole in 50-100 words.
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Several planets in our solar system have a magnetosphere. Describe what is required, in general, for a magnetosphere to exist (not just Earth). Also comment on what you see as the impact to us if we had no magnetosphere.
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When did stromatolites appear on Earth?A. HadeanB. MesozoicC. Archean
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a wave is created by causing vibrations in particles of matter.
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As a boss, knowing your employees personality types can help you
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1. A fluid with viscosity 1.2 Pa s moves through a 200-m-long pipe with a 20 cm diameter. What difference in pressure between the ends of the pipe is needed for a flow of 0.1 m^3/s?1. 611 kPa2. 380 kPa3. 38 mPa4. 0.61 Pa2. A torpedo with characteristic length L=1.2 m is traveling through water (density 1000 kg/m^3, viscosity 1.0 mPa s) at speed 10 m/s. What is Reynold's number for this torpedo?1. 1.2x10^42. 1.23. 1.2x10^74. 1.2x10^-33. A torpedo with characteristic length L=1.2 m is traveling through water (density 1000 kg/m^3, viscosity 1.0 mPa s) at speed 10 m/s. Is the flow of water around the torpedo laminar?1. It is unstable, so it could be either laminar or turbulent.2. It is neither because water isn't real.3. No, it is turbulent.4. Yes, it is laminar.
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Rahul is carrying 20 bricks of 10 N each for 30m distance in minutestime, calculate his power.
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Rearranging the equation m= 5Kg and a= 2 m\s2
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What is the cos of 22
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i. How does The Bhutan Forest Act of 1969, affect the lives of shifting cultivators?
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Current is a stream of
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The following table was made to compare the different seismic waves. What correction needs to be made? A. Rayleigh waves have a rolling movement and Love waves have a horizontal movement that is perpendicular to the wave.B. Rayleigh and Love waves are body waves, P-waves and S-waves are surface waves.
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In Asch's study referenced above, answer the following questions: How is the principle of conformity examined? When and why do you think the subject in the experiment began to "second guess" himself? What are some of the circumstances in the experiment which contribute to conformity? Why do you think some participants would be more likely to conform than others? There are many reasons why people conform. Were you ever in a situation where you had to conform? Why did you feel the need to conform?
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Consider an ideal intrinsic semiconductor in thermal equilibrium. No external forces or elds are applied to this semiconductor. At temperatures above 0 K, the electron concentration in the conduction band is non-zero becauseA: some electrons from dopant atoms will overcome the bandgap by gained thermal energy.B: some electrons from dopant atoms will overcome the ionization energy by gained thermal energy.C: some electrons from the conduction band will overcome the bandgap by gained thermal energy.D: some electrons from the valence band will overcome the bandgap by gained thermal energy.
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Which material will transfer the most electrons when rubbed against a rubber rod?cottonwoolrabbit fursilk
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A climber throws a rope with a velocity of 3.0 m/s downward to another climber 4.0 m directly below. Conclude the ropes velocity when it reached the lower climber? Assume no air resistance and that a = -g = -9.81 m/s2.
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You are driving through town at 11.0 m/s when suddenly a ball rolls out in front of you. You apply the brakes and begin decelerating at 3.2 m/s?
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What gravitational force does the earth exert on a personstanding on the surface of the earth? The mass of the earth is5.97 x 1024 kg, the mass of the person is 62 kg and the radiusof the earth is 6.4 x 106 m.
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