How much heat (in joules) is required to raise the temperature of 34.0 kg of water from 15°C to 95°C?
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A fortnight is a charming English measure of time equal to
2.0 weeks (the word is a contraction of “fourteen nights”).That is a
nice amount of time in pleasant company but perhaps a painful
string of microseconds in unpleasant company. How many microseconds
are in a fortnight?
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How fast (in rpm) must a centrifuge rotate if a particle 8.0 cm from the axis of rotation is to experience an acceleration of 100,000 g’s?
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An average active person consumes about 2500 Cal a day. (a) What is this in joules? (b) What is this in kilowatthours? (c) If your power company charges about 10 ¢ per kilowatt-hour, how much would your energy cost per day if you bought it from the power company? Could you feed yourself on this much money per day?
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(a) 18° below zero on the Celsius scale is what Fahrenheit temperature? (b) 18° below zero on the Fahrenheit scale is what Celsius temperature?
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Sketch qualitatively the electric field lines both between and outside two concentric conducting spherical shells when a uniform positive charge q1 is on the inner shell and a uniform negative charge -q2 is on the outer. Consider the cases q1 greater than q2, q1 = q2, and q1 less than q2.
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A sinusoidal transverse wave of wavelength 20 cm travels along a string in the positive direction of an x axis. The displacement y of the string particle at x = 0 is given in the figure as a function of time t. The scale of the vertical axis is set by y_s = 4.0 cm. The wave equation is to be in the form y(x, t) = y_m sin(kx ± ωt + ϕ). (a) At t = 0, is a plot of y versus x in the shape of a positive sine function or a negative sine function? What are (b) ym, (c) k, (d) v, (e) ϕ, (f) the sign in front of ω, and (g) the speed of the wave? (h) What is the transverse velocity of the particle at x = 0 when t = 5.0 s?
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Two billiard balls of equal mass undergo a perfectly elastic head-on collision. If one ball’s initial speed was 2.00 m/s, and the other’s was 3.60 m/s in the opposite direction, what will be their speeds and directions after the collision?
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A bird can fly 25 km/h. How long does it take to fly 3.5 km?
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