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A Styrofoam box has a surface area of 0.88 m2 and a wall thickness of 2.0 cm. The temperature of the inner surface is 5.0°C, and the outside temperature is 27°C. If it takes 7.4 h for 5.0 kg of ice to melt in the container, determine the thermal conductivity of the Styrofoam. W/m·K
Suppose the ruler in procedure 3 is asymmetrical, balancing at the58.2cm mark. The ruler is now supported at the44.3cm mark, Find the mass of the ruler
As a baseball is being caught, its speed goes from 30 to 0m/sin about .005s. Its mass is .145kg. What is the size of the force acting on it
when it falls back it hits the ground with speed v1=50m/s. The mass of the ball is m=20g. Evaluate what is the total work done by the drag force while the ball is in the air?
After 35 minutes of running, at the 9km points in a 10km race, you find yourself 100 m behind the leader and moving at the same speed. what should your acceleration be if you are to catch up by the finish line? assume that the leader maintains a c..
A 256 kg wooden raft floats on a lake. When a 80 kg man stands on the raft, it sinks 9.0 cm deeper into the water. When he steps off, the raft vibrates for a while. What is the total energy of vibration
A long, straight wire lies in the plane of a circular coil with a radius of 0.050 m. The wire carries a current of 6.0 A and is placed along a diameter of the coil. What is the net flux through the coil
On a horizontal axis attached a flywheel and lightweight pulley with radius of 5 cm. On the pulleh is reeled with a cord, to which is hanged a weight with mass of 0.4 kg.
The wavelength of red helium–neon laser light in air is 632.8 nm. What is its frequency? What is its speed in the glass?
A constant force, F = (4.63, ?3.79, 1.96) N,acts on an object of mass 18.9 kg, What is the total work done by this force
A construct force vector F = 2.0i + 4.0j N acts on an object as it means along a straight- line path. If the object is displacement is d = 2.0i + 5.0j m calculate the work done by vector F
An aircraft performs a maneuver called an aileron roll. During this maneuver, the plan turns like a screw as it maintains a straightflight path, but using its ailerons to set the wings in circularmotion.
An electron has a spin magnetic moment of magnitude ? = 9.285·10–24 A m2. Consequently, it has energy associated with its orientation in a magnetic field.
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