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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?
A street light is supported by two wires and each makes a different angle from each other. Find the tension in each wire if the street light has a mass of 60.0 kg
A skier with a mass of 63 kg starts from rest and skis down an icy slope that has a length of 50 m at an angle of 32 degrees with respect to the horizontal. Iillustrate what is the speed of the skier at the bottom of the slope?
An 80 kg skydiver falls through air with a density of 1.15 kg/m3 . Assume that his drag coefficient is C=0.57. What are the terminal speeds in both cases
A space traveler weighs 550 N on earth. What will the traveler weigh on another planet whose radius is three times that of earth and evaluate whose mass is twice that of earth?
A basketball player makes a jump shot. The 0.600 kg ball is released at a height of 2.00 m above the floor with a speed of 7.20 m/s. The ball goes through the net 3.10 m above the floor at a speed of 4.20 m/s Find the work done on the ball by air ..
A neutral pie-meson is particle that can be created by accelerator beams. If one such particle lives 1.40 x 10^16 s as measured in the laboratory, what is its velocity relative to the laboratory
consider two solid disks of identical radius and thickness. one of the disks is made of aluminum (density=2.7g/cm), what is the ratio between the two moments of inertia
A neutron with mass of approximately 1.00 u and speed of 100 m/s strikes the nucleus of a lead atom head-on. how fast will each particle move after the impact
You can simulate radioactive decay by tossing pennies. Assemble a collection of as many pennies (or other coins) as you can; around 100 would be ideal. What is the half-life in numbers of tosses
A cylindrical piece of metal 0.085 m tall with a diameter of 3.90 cm has sp.gr. = 2.0, what is the mass of the cylinder
A flight attendant pulls her 63N flight bag a distance of 312m along a level airport floor at a constant velocity. The force she exerts is 39N at the angle of 59° above the horizontal.
Find the energy, in joules, of one quantum of energy for an atomic oscillator in a block of aluminium.
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