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The concrete wall of a building is 0.114 m thick. The temperature inside the building is 24.3 °C, while the temperature outside is 0.0 °C. Heat is conducted through the wall. The outside of the wall loses the energy only due to radiation. What is the emissivity of the wall?
An object is placed in front of a converging lens in such a position that the lens (f = 13.1 cm) produces a real image located 22.0 cm from the lens. What is the image distance of this new image
A playground merry-go-round has radius 3-{rm m} and moment of inertia 3000-{rm{ kg}} cdot {rm{m}}^2 about a vertical axle through its center, and it turns with negligible friction.
Two masses of 1.50 kg each, connected by a string, slide down a ramp making an angle of 37° with the horizontal. The coefficient of kinetic friction between M1 and the ramp is 0.39. The coefficient of kinetic friction between M2 and the ramp is 0.14...
A uniform slender rod of length l and mass m rotates about a vertical axis AA' with a constant angular velocity V. Determine the tension in the rod at a distance x from the axis of rotation
What is the total momentum of the system in kg m/s? (Assume motion to the right is positive and all variables are known to 3 significant figures).
What is the direction of this velocity. What is the magnitude of the velocity.
Apply Bohr's quantization condition to the motion of the Earth around the Sun. Find a formula for the radii of the allowed circular Earth orbits (involving quantum number n ). What is the difference in radii among the orbit in part (b) and the next l..
A 0.035 kg aluminum bullet traveling at 429 m/s strikes an armor plate and comes to a stop. What is the bullet temperature change in degrees Celsius
a mass is hanging from a spring. consider this position the zero point. it is in equilibrium at this position. by
The flywheel of an engine has moment of inertia 2.50 kg about its rotational axis. What constant torque is needed to bring it up to an angular speed of 400 rev/min in 8.00 s, starting from rest?
A 251 kg wooden raft floats on alake. When a 76 kg man stands on theraft, it sinks 9.0 cm deeper into thewater. When he steps off, the raft vibrates for a while. What is the frequency of vibration
A ship moves 10.2km dueeast, and then 5.9km due north. What are the magnitude and the direction of the resultant displacement vector
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