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On a cold night the temperatures of the two surfaces of a glass windowpane in a house are 7.8° C on the outer surface and 8.0° C on the inner surface when the air temperature is 0° C outside and 18.6° C inside. The glass is 3.33 mm thick. (The thermal conductivity for glass is 0.8 W/m-C°.)
(a) Find the rate at which heat is conducted through the glass per square meter of window area.
(b) Find the value of the convection coefficients for the heating of the inner surface of the glass and for the cooling of the outer surface.
An arrow is shot vertically upward and then 2.06 s later passes the top of a tree 41.3 m high. How much longer will the arrow travel upward
The escape speed from a very small asteroid is only 26 m/s. If you throw a rock away from the asteroid at a speed of 39 m/s, what will be its final speed.
describe why pluto was demoted from the planet status. be sure to describe what class of planetoid it is considered now
A rectangular plate has a length of (20.4 0.2) cm and a width of (8.7 0.1) cm. Calculate the area of the plate
A person swings a 0.521-kg tether ball tied to a 4.60-m rope in an approximately horizontal circle. what is the maximum angular speed of the ball
When a hammer strikes a nail, it is compressed along its length. Suppose that a steel nail 10.00 cm long and 3.00 mm in diameter is compressed an average of 65.0 µm by a 0.415 kg hammer during a 1.20 ms collision
You want to throw a pebble at a window located 9.6 m above the ground, making sure that the pebble hits the lowest part of the window with a strictly horizontal velocity. What is the velocity with which the pebble hits the window
What are the following values about the central axis at the instant the torque has been applied for 195ms? The angular momentum of disk.
a force of magnitude 7.50 N pushes three boxes with masses m1 = 1.30 kg, m2 = 2.80 kg, and m3 = 5.30 kg. Find the magnitude of the contact force between boxes 1 and 2
q1. a man pulls a crate of mass 75.0 kg across a level floor. he pulls with a force of 180.0 n at an angle of 26.0deg
Two objects of the same mass, m = 1.00 kg, are projected towards each other. The first object initially has velocity (20.0m/s)i^. What is the change in kinetic energy in the collision
An automobile battery has an emf of 12.2 V and an internal resistance of 0.088 omegacap.gif. What is the potential difference across the headlight bulbs when they are the only load on the battery
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