(me if you can)
a wall is made up of four elements, as follows: ½” wood siding r = 0.81 ½” plywood sheathing r = 0.62 3 ½” fiberglass r = 10.9 ½” sheetrock r = 0.45 (units of r-value are ft2-hr-of/btu)
a. how many btu per hour would be would be transferred through a 1 sq. foot section of the wall if the outside is 50of colder than the inside.
b. in which direction (in or out) would the heat flow? (units of r-value are ft2-hr-ºf/btu)
c. what is the heat transfer through the wall (in btu/hr) if the insulation was not installed?

Bone-strengthening physical activity done increases bone-mineral content and bone density in youth.

There is a theory that indicates that dinosaurs became extinct when about 65 million years ago, a large asteroid hit the earth surface. dust caused by this collision blocked the sunlight reaching the earth's surface and many forms of life became extinct due to the cold. fearing this threat, how large the radius of an asteroid should you be looking for if the dangerous asteroid size is approximately the same as the one that killed the dinosaurs? available data suggests that about 18% of that asteroid's mass ended up as a dust spread evenly over earth after eventually settling out of the upper atmosphere. about 0.0180 g/cm^2 of dust, which is chemically different than the earth's rock, covered the earth's surface. typical asteroids have a density of about 1.9 g/cm^3. now that we know the size of the asteroid, how much energy was released during impact, assuming all of it was just the kinetic energy of the asteroid right before the impact?

The car hoist allows the car to be driven onto the platform, after which the rear wheels are raised. if the loading from both rear wheels is 1380 lb, determine the force in the hydraulic cylinder ab. neglect the weight of the platform itself. member bcd is a right-angle bell crank pinned to the ramp at c. the force is positive if in tension, negative if in compression.