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(a) What is the rate of energy loss in watts per square meter through a glass window 1.6 mm thick if the outside temperature is -8.3°F and the inside temperature is +84°F?
(b) A storm window having the same thickness of glass is installed parallel to the first window, with an air gap of 6.7 cm between the two windows. What now is the rate of energy loss if conduction is the only important energy-loss mechanism? (The thermal conductivity of window glass is 1.0 W/m·K, and of air is 0.026 W/m·K.)
What can you conclude about the resulting displacements?
A shopper pushes a cart 39 m south down one aisle and then turns 90.0° west and moves 22 m. He then makes another 90.0° turn and moves 14 m.
It starts from rest at t = 0, and a line drawn from the center of the disk to a point P on the rim of the disk makes an angle of 57.3° with the positive x-axis at this time. Find out the angular speed of the wheel at t = 2.30 s.
A ray of sunlight is passing from diamond into crown glass; the angle of incidence is 36.00°. Determine the angle between the refracted blue and red rays in the crown glass
Consider a thin rod of mass 3.7 kg, length 1.8m and uniform density. The rod is pivoted at one end on a frictionless horizontal pin
suppose 20m long steel rods are used in 20m long slabs. calculate the increase of length of a slab due to this speeding 18 wheeler on this hot day
First, set the mass of the star to 1.0 solar masses and click the "Auto" box. What is the lifetime of a Solar mass star according to this simulation
A stick is resting on a concrete step with 2/5 of its length hanging over the edge. A single ladybug lands on the end of the stick hanging over the edge, and the stick begins to tip. obtain the magnitude of the angular acceleration of the stick
A satellite is in a circular orbit about the earth (M = 5.98 x 1024kg). The period of the satellite is 3.44 x 104s. What is the speed at which the satellite travels?
An unstable particle with a mass equal to 3.34 multiplied by 10-27 kg is initially at rest. The particle decays into two fragments that fly off with velocities of 0.981c and -0.864c, respectively. Find the masses of the fragments. (Hint: Conserve ..
Two forces parallel to the x axis do 16.8 J of work on a small tray while moving it 17.5 m in the x direction across a gym floor. What is the other force
A circular disk with a radius of 0.65 meters and mass of 0.26 kg has a hole cut in the middle.
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