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You have a 2.09-m-long stretched string with a mass of 19.1 g. When you oscillate the string at 440 Hz, which is the frequency of the standard A pitch that orchestras tune to, you observe transverse waves with a wavelength of 16.7 cm traveling along the string. Calculate the tension in the string.
Today's terrestrial background radiation is about 50 mrem/year, mainly due to the uranium and thorium decay chains, and potassium. The earliest evidence of life on earth was about 3.5 billion years ago.
A parallel-plate capacitor is made by placing polyethylene ( =2.3) between two sheets of aluminum foil. The area of eachsheet of aluminum foil is 410 cm2, and the thickness ofthe polyethylene is 0.5 mm.
A camera has a lens with a focal length of 26.8 cm. how far from the film should the lens be placed
A quasar 10 billion light years from Earth appears the same brightness as a star 5.9*10^4 light years away. How does the power ouput of the quasar compare with that of the star
A cannonball shot with the initial velocity of 129 m/s at an angle of 36° follows a parabolic path and hits a balloon at the top of its trajectory. Neglect air resistance, how fast is the cannonball going as it hits the balloon.
during heavy rain a section of a mountainside measuring 3.8 km horizontally perpendicular to the slope 0.44 km up along
A 35 mm camera with interchangeable lenses is used to take a picture of a hawk that has a wing span of 1.5 m. The hawk is 39 m away. What would be the ideal focal length of the lens used
A 40 kg crate is pulled across a rough horizontal surface with a force of 350 N at an angle of 25o above the horizontal. What is the horizontal acceleration, in m/s2, of the crate
A "swing" ride at a carnival consists of chairs that are swung in a circle by L = 14.2 m cables attached at an angle of ? = 62.7° to a vertical rotating pole. Calculate the tension in the cable attached to the chair
You launch a rock from the origin (0,0) with an initial speed of 50 m/s at an angle of ?o=30° from horizontal. How far horizontally will the rock travel before it lands
The atmosphere on Mars is almost all carbon dioxide (CO2), and has a pressure of about 6.9×102 Pa, what is the mass of one cubic meter of the atmosphere
a mass-spring system oscillates on a horizontal frictionless surface with an amplitude of 3.56 cm. if the spring
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