Isaac Newton's contributions to physics include
a. the laws of motion.
b. the law of universal gravitation.
c. invention of the calculus.
d. the invention of the reflecting telescope.
e. all of the above.
e
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What is the radius of curvature of the path of a 3.0-keV proton in a perpendicular magnetic field of magnitude 0.80 T?
A. 9.9 mm B. 1.1 cm C. 1.3 cm D. 1.4 cm E. 7.6 mm
You and your friend, who has the same mass as you, want to go to the top of the Eiffel Tower. Your friend takes the elevator straight up. You decide to walk up the spiral stairway, taking longer to do so
Compare the gravitational potential energy of the system you-Earth and your friend-Earth, after you both reach the top. A) It is impossible to tell, since the times you both took are unknown. B) It is impossible to tell, since the distances you both traveled are unknown. C) The friend-Earth system's gravitational potential energy is greater than the you-Earth system's gravitational potential energy, because he got to the top faster. D) Both systems have the same amount of gravitational potential energy at the top. E) The you-Earth system's gravitational potential energy is greater than the friend-Earth system, because you traveled a greater distance in getting to the top.
A quantity that has only a magnitude but no direction associated with it is called a __________
Fill in the blank(s) with correct word
When work is done by a system and heat is subtracted, the temperature of the system
A) increases. B) decreases. C) remains unchanged.