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The "steam" above a freshly made cup of instant coffee is really water vapor droplets condensing after evaporating from the hot coffee. What is the final temperature of 260 g of hot coffee initially at 85.0oC if 2.50 g evaporates from it? The coffee is in a Styrofoam cup, and so other methods of heat transfer can be neglected. Assume that coffee has the same physical properties as water.
A train leaves the railroad station with an acceleration of 0.06m/s2. How far has the train traveled
Electrons in an x-ray tube are accelerated through 100 kV and directed toward a target to produce x-rays. Determine the power of the electron beam in this tube if it has a current of 12.0 mA
The rope of a swing is 3.2 meter long. Find the angle from the vertical at which a 77 kilogram man must begin to swing in order to have the same kinetic energy at the bottom as a1460 kilogram car moving at 1.55 m/s
in the form of radioactive decay known as alpha decay an unstable nucleus emits a helium-atom nucleus which is called
If 0.2 kg of chai tea at 90 degrees C is poured into a 0.3 kg cglass cup(C=840 J/kg K) at 20 degrees C, what is the final temperature of the chai tea
A 40.0 N force is applied to a 46.0 cm long torque wrench. What is the net torque applied to the nut, what is the bolt%u2019s moment of inertia
A wire is 0.79 m long and 0.77 mm2 in cross-sectional area. It carries a current of 4.1 A when a 2.0 V potential difference is applied between its ends
a 60-w light bulb emits spherical electromagnetic waves uniformly in all directions. if 50 of the power input to such a
Two balls, of masses m(a) = 40 g and m(b) = 60 g, aresuspended. The lighter ball is pulled away to a 60 degreeangle with the vertical and released. what is the velocity ofthe lighter ball before impact
two ping-pong balls each have a mass of 2.7 g and carry a net charge of 0.430 microc. one ball is held fixed. at what
Suppose that you'd like to find out if a distant star is moving relative to the earth. The star is much too far away to detect any change in its brightness as it moves toward or away from the earth. Instead we can use the Doppler effect to determi..
Gamma rays with the very high energy of 2.2×10^13 eV are occasionally observed from distant astrophysical sources. What is the frequency corresponding to this photon energy
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