Physics Homework Answers & Questions Page 45

• What does a transformer do to AC voltage?

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• How does energy flow through an ecosystem?

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• If a 60 kg person on a 15 kg sled is pushed with a force of 300 N, what will be a person's acceleration?

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• How can I calculate the densities of a hydrogen nucleus and a hydrogen atom?

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• How is buoyant force related to floating and sinking?

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• How does heat differ from thermal energy?

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• How are electromagnetic waves different from sound waves?

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• What is the magnitude and direction of the gravitational force that acts on a woman who weighs 500 N at the surface of Earth?

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• How do you calculate specific heat capacity of an unknown metal?

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• What kind of simple machine is a pliers?

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• How would you add two vectors that aren't perpendicular or parallel?

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• How does mass affect a pendulum's period?

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• How does wave refraction occur at a shoreline?

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• Is uniform circular motion in equilibrium?

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• How does thermal expansion affect a thermometer?

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• Rupert drove home at an average rate of 58 miles per hour. What is his rate in feet per second?

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• How many seconds are there in a year?

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• How does electromagnetic radiation relate to flame tests?

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• What are free body diagrams and what are they used for?

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• What color of light has the most energy?

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• In unit-vector notation, what is the sum of A = (5.4m)i + (1.4m)j and B = (-14.0m)i +(6.4m)j.What are (b) the magnitude and (c) the direction of A+B (relative to i) ?

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• Why is plane polarised light not the same as monochromatic light?

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• The Eiffel Tower is built of wrought iron approximately 300 m tall. Estimate how much its height changes between July (temperature of 31°C) and January (temperature of-4°C). Ignore the angles of the iron beams, and treat the tower as a vertical beam.

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• Which are those two vectors whose resultant vector is zero?

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• A segment of steel railroad track has a length of 30,000 m when the temperature is 0,0 Celsius. What is the length when the temperature is 40 Celsius?

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• Explain why dogs pant during hot summer days using the concept of evaporation?

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• What is 75 miles per hour in kilometers per second?

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• What is the percent difference between the acceleration due to gravity at sea level and at the uppermost peak of Mount Everest?

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• Light is travelling in quartz, which has an index of refraction of 1.458. How fast does light travel in quartz?

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• Why does wavelength of a light change when it passes from one medium to another?

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• Does a steeper graph mean a greater acceleration?

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• A 12.0 g rubber bullet travels at a velocity of 150 m/s, hits a stationary 8.5 kg concrete block resting on a frictionless surface, and ricochets in the opposite direction with a velocity of -100. m/s. How fast will the concrete block be moving?

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• How much energy will it take to melt 100 grams of ice at 0◦C?

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• The latent heat of fusion of water is 334 J/g. How many grams of ice at 0°C will melt by the addition of 3.34 kJ of heat energy?

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• If Jacob ran 24 kilometers, how many miles did Jacob run?

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• Can anyone please tell me the definition of Time, Speed, and Velocity please?

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• How does Newton's third law relate to an egg drop?

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• How do you convert a length of 17.0 m to inches?

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• By what factor would your weight change if Earth's diameter were tripled and its mass were tripled?

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• What is the unit for the index of refraction?

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• What is Pressure?

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• What is the average power supplied by a 60.0 kg person running up a flight of stairs a vertical distance of 4.0 m in 4.2 s?

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• What does force mean?

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• What is instantaneous acceleration?

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• Is capacitance inversely proportional to voltage?

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• Neon gas has a volume of 2,000ml with an atm of 1.8, however if the pressure decreases to 1.3atm, what is now the volume of the neon gas?

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• What are vectors used for?

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• How do you calculate the mechanical advantage of a second-class lever?

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• How does the law of conservation of energy apply to chemical changes?

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• Calculate the equivalent resistance of the combination of three resistors of 2 ohm ,3ohm,and 6ohm joined in parallel?

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