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At a mail sorting facility, packages slide down a ramp but are stopped part way down the ramp so that they can be scanned. While the packages are scanned, they are held in place by a horizontal, spring-loaded arm. Calculate the force that must be applied by this arm to hold a package on the ramp. The ramp is at an angle of 31.5 degrees with the horizontal. The package has a mass of 9.25 kg. the coefficient of static friction between the ramp and the package is .385. (keep in mind that the spring-loaded arm is not parallel to the ramp, but horizontal.)
A jumbo jet has a mass of 2.3 × 105 kg and a total wing area of 950 m2, what is the difference in pressure between the upper and lower wing surface
A skydiver is falling downward through the air. He weighs 241.5 pounds. There is an upward force of air friction opposing his fall. What is the upward force of air friction
A dragster starts from rest and accelerates down a track. Each tire has a radius of 0.320 m and rolls without slipping. At a distance of 408 m, determine the linear speed of the dragster
The electricity received at an electric substation has a potential difference of 2.80 10^5V. If the requires output is 440V, what must be the ratio of the turns of the step-down transformation.
Two newly discovered planets follow circular orbits around a starin a distant part of the galaxy. The orbital speeds of the planetsare determined to be 44.3 km/s and 60.5 km/s. The slower planet'sorbital period is 7.03 years.
A refracting telescope is used to view the Moon (diameter 3480 km, distance from Earth 385,000 km). What should be the distance between the lenses
A 4.7- kg box of books is pulled up a 4.16- m-long inclined plank to a height of 1.8 m. What percent of the work is lost to friction
A prospector finds a solid rock composed of granite (\rho = 2560 {\rm kg/m^{3}}) and gold, What percentage of the rock is gold by volume
A vertical cylinder with a heavy piston contains air at 320 K. The initial pressure is 3.35x10^5 Pa, and the initial volume is 0.270 m3. Calculate the mass of the air in the cylinder
A Van de Graaff generator has a spherical dome of radius 20 cm. what is the maximum charge that can be held on the dome
question at the top of earths atmosphere sunlight has an average intensity of 1380wm2 .if the average distance from
The head of a grass string trimmer has 100 g of cord wound in a light, cylindrical spool with inside diameter 3.00 cm and outside diameter 18.0 cm as shown in the figure below. The cord has a linear density of 10.0 g/m. A single strand of the cord..
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