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Question: A Styrofoam box has a surface area of 0.81 m2 and a wall thickness of 2.0 cm. The temperature of the inner surface is 5.0°C, and the outside temperature is 25°C. If it takes 7.3 h for 5.0 kg of ice to melt in the container, determine the thermal conductivity of the Styrofoam.
Four ropes, all at right angles to each other, pull on a ring. the force N, W; and D= 20N, S. Find the resultant direction of force on the ring
If a person radiates about 67 W of power at room temperature, how long does it take for a person to radiate away the energy acquired by consuming a 260 Calorie donut?
Musicians can use beats to tune their instruments. One flute is properly tuned and plays the musical note A at exactly 440 Hz. By how much she must shorten her flute to bring it into tune
A bat strikes a 0.145-kg baseball. Just before impact, the ball is traveling horizontally to the right at 60.0m/s , Find the vertical component (Fy) of the average force on the ball
q1. two charges are placed on the x axis. one of the charges q1 6.95c is at x1 3.00 cm and the other q2 -27.3c is at
Heat continues to be supplied to the two pots at constant rates beyond the time when they have equal temperature. When the water in the second pot reaches 80°C, what is the temperature of the water in the first pot
A 17.00{\rm kg} lead sphere is hanging from a hook by a thin wire 3.30{\rm m} long, What must be the minimum initial speed of the dart so that the combination makes a complete circular loop after the collision
High-speed stroboscopic photographs show that the head of a 220-g golf club is traveling at 42 m/s, Find the speed of the golf ball just after impact
Three moles of a monatomic ideal gas are heated at a constant volume of 1.16 m3. The amount of heat added is 3.33 x103 J. (a) What is the change in the temperature of the gas? (b) Find the change in itsinternal energy. (c) Determine the change inp..
A cyclotron for acceleration deuterons ( A Deuteron has one proton and one neutron) has a magnetic field of .5 T and a radius of 1 m, the frequency of the cyclotron is
A long vertical wire carries an unknown current. Coaxial with the wire is a long, thin, cylindrical conducting surface that carries a current of 31.7 mA upward, what is the current (in A) in the wire
Assume that each cubic centimeter of water has a mass of exactly 1.00 g. What is the mass of one cubic meter of water
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