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A 30 g ice cube floats in 210 g of water in a 100 g copper cup; all are at a temperature of 0°C. A piece of lead at 95°Cis dropped into the cup, and the final equilibrium temperature is 12°C. What is the mass of the lead?
a pump on the ground floor of a building can pump up water to fill a tank of volume 30 m3 in 15 min. if the tank is 40m
A harmonic on a string1.3 m long has a frequency of 15.6 Hz. The next higher frequency is 23.4 Hz. Both ends ofthe string are fixed. What is the fundamental frequency
A non-uniform beam of length 4.51m and weight 1.05kN makes an angle of 24.0 degrees with the horizontal. Find the vertical component of the force exerted on the beam by the pivot
An explosion occurs at the end of a pier. The sound reaches the other end of the pier by traveling through three media: air, fresh water, and a slender metal handrail. After the first sound arrives, how much later does the second sound arrive
A ray of light is incident on glass-air interface at the critical angle of 41 deg., what is the refracted angle, What is the strength of a lens which forms an image 24 cm from the lens when the object is 40 cm away
A runaway, 400-kg wagon enters a cornfield with a velocity of 12 m/s and eventually comes to rest. What work was done on the wagon in kJ
The wheels, axle, and handles of a wheelbarrow weigh W = 68 N. The load chamber and its contents weigh WL = 605 N. Find the magnitude of the man's force for both designs
A styrofoam cooler (K = .030 W/mo C) has an average surface area of 0.576 m2 and an average thickness of 2.6 cm. How much heat is required to melt the ice in the cooler
Mars rotates on its axis once every 1.02 days (almost the same as Earth does). (a) Find the distance from Mars at which a satellite would remain in one spot over the Martian surface. (Use 6.42 1023 kg for the mass of Mars.) m (b) Find the speed of th..
Show that the boundary conditions far away from the cylinder
A generator has a square coil consisting of 600 turns. The coil rotates at 66 rad/s in a 0.32 T magnetic field. What is the length of one side of the coil
A 9.0 kg mess kit sliding on africtionless surface explodes into two 4.5kg parts, one moving at 6.0 m/s, duenorth, and the other at 7.5 m/s,30° north of east. What was the original speed of the mess kit?
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