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a 710 n daredevil was shot out of a cannon at an upward angle. he landed 2.3 s later in a net at the same height but 35m away from the cannon.

A)what was the magnitude of his initial velocity?
B)what was the launch angle?
C)it took the cannon 0.6 seconds to launch him and the kinetic friction in the cannon was 405 n. what constant force did the cannon apply to the daredevil? (hint after the second attempt.)
causes of background radiation
With the recent award to Higgs,etc. for defining the Higgs/Bosin field- something that slows matter down and allows it to attain mass. I was wondering, why is it that particles moving at the speed of light are not affected by the Higgs/Bosin field? I remember from college that as things approach the speed of light, they become massless and that this fulfills theory-but in a physical sense, why is this?
why are electrons revolving around orbit?
compare momentum of 10^5eV X ray photon (Px) with that of a 10^5eV electron
why laser beam is parallel in ruby laser?
which cause of ultra violet radiation?
does the temerature effect the rate of decay of radioactive nucleoid ? if so . how ?
what are the difficulties in making the fission chain reaction (go)?
Derive the expression for the isotopic energy shift