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A 1500 ft2 wall has an R-value of 11.0 hr.oF.ft2/Btu, including the effects of the interior and exterior air layers. How many Btus are lost through this wall in a 5600 degree day heating season?
The tape is now wound back into the drum at angular rate. With what speed would the end of the tape move? (Note that our drawing specifies that a positive derivative of implies motion away from the drum. Be careful with your signs. The fact that the ..
q1. two balls of masses 43kg and 65kg are suspended. the lighter ball is pulled away to a 66 angle with the vertical
A uniform 270N ladder rests against a perfectly smooth wall, making a 40.0? angle with the wall. What is the friction force on the ladder at the floor
An audio amplifier, represented by the AC source and the resistor R, what is the time-averaged power delivered to the speaker
Three pendulums with strings of the same length and bobs of the same mass are pulled out to angles q1, q2 and q3 respectively and free. The approximation sin q = q holds for all three angles, with q3 > q2 > q1. How do the angular frequencies of th..
An 85 kg linebacker is running at 8 m/s directly toward the sideline of a football field. Determine their common speed and direction immediately after they collide
A 82 kg diver steps off a 12 m tower and drops from rest straight down into the water. If he comes to rest 4.0 m beneath the surface, find out the average resistance force exerted on him by the water.
A sperical source ratiates sound uniformly in all directions. At a distance of 18m, the sound intensity level is 100dB. what power is radiated by this source
How much work is needed to move a 120-kg refrigerator.
Assume that the earth is a uniform density spherical mass. (This assumption is not correct but we will use it for simplicity in working the problem.)
(a) Construct the wave function for hydrogen in the state n=4, l=3, m=2. Express your answer as a function of the spherical coordinates (r,theta,phi). (b) Find the expectation value of r in this state.
A ball thrown straight up from the ground passes a window 5.6 m up. An observer looking out the window sees the ball pass the window again, going down, 2.6s later
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