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An elevator manufacturing company is stress-testing a new elevator in an airless test shaft. The elevator is traveling at an unknown velocity when the cable snaps. The elevator falls 1.40 m before hitting the bottom of the shaft. The elevator was in free fall for 0.900 s. Compute its velocity when the cable snapped.
two coils have the same number of circular turns and carry the same current. each rotates in a magnetic field acting
A canoe heading 30 degrees west of north is being paddled at a rateof 7 mi/h. Find the resulting speed and direction of the canoe
a cylindrical container with a cross-sectional area of 62.2 cm2 holds a fluid of density 786 kgm3. at the bottom of the
The radius of Earth is about 6.38 multiplied by 10^3 km. A 7.02 multiplied by 10^3 N spacecraft travels away from Earth. What is the weight of spacecraft at the following distances from Earth's surface: 6.38 times 10^3 km and 1.4 times 10^4 km.
A NASCAR racecar rounds one end of the Martinsville Speedway. What is the force responsible for the centripetal acceleration in this case
At one point in space, the electric potential energy of a 10 charge is 34. If a 25 charge were placed at this point, what would its electric potential energy be
A 0.575 kg mass falls from a height of 3.95 m. If all of the energy of this mass could be converted to visible light of wavelength 5.29E-7 m
A crude model of the human vocal tract treats it as a pipe closed at one end. Find the effective length of the vocal tract in a person whose fundamental tone is 550Hz . Sound speed in air at body temperature is 354 m/s.
Two objects with different masses are stuck together and attached to the ends of two strings coming down from a mass less, frictionless pulley. explain will the tension in the rope change
Two equal mass stars maintain a constant distance apart of 8.0x 1010 m and rotate about a poing midway betweenthem at a rate of one revolution every 12.6 yr , What must be the mass of each stars
You have a 1200W microwave. When you put a cup of water in for 8 minutes only half evaporates. How efficient is your microwave
a 4 microf capacitor is charged by a 200 v supply. it is then disconnected from the supply and is connected to another
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