Physics, 07.09.2021 04:50 madisonrosamond99
A tree moves at 30 km/s relative to the Sun. A squirrel jumps from a branch on
this tree to an acorn on the ground. But taking one second to drop, the acorn
should then be 30 kilometers away. We can understand why this reasoning is
wrong by looking to Newton's
Third law
First law
Second law
Law of gravitation
Answers: 1
Physics, 21.06.2019 17:30
Acatapult is tested by roman legionnaires. they tabulate the results in a papyrus and 2000 years later the archaeological team reads (distances translated into modern units): range = 0.4 km; angle of launch = π/5 rad; landing height = launch height. what is the initial velocity of launch of the boulders if air resistance is negligible?
Answers: 3
Physics, 22.06.2019 22:50
Cyclotrons are widely used in nuclear medicine for producing short-lived radioactive isotopes. these cyclotrons typically accelerate h- (the hydride ion, which has one proton and two electrons) to an energy of 5 mev to 20 mev. this ion has a mass very close to that of a proton because the electron mass is negligible—about 1 2000 of the proton’s mass. a typical magnetic field in such cyclotrons is 1.9 t. (a) what is the speed of a 5.0-mev h-? (b) if the h- has energy 5.0 mev and b = 1.9 t, what is the radius of this ion’s circular orbit?
Answers: 1
A tree moves at 30 km/s relative to the Sun. A squirrel jumps from a branch on
this tree to an aco...
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