At an instant when a particle of mass 80 g has a velocity of 25 m/s in the positive y direction, a 75-g particle has a velocity of 20 m/s in the positive x direction. What is the speed of the center of mass of this two-particle system at this instant?
a. 16 m/s
b. 45 m/s
c. 23 m/s
d. 20 m/s
e. 36 m/s
a
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Matter Waves: A proton and an electron are both accelerated to the same final speed. If ?p is the de Broglie wavelength of the proton and ?e is the de Broglie wavelength of the electron, then
A. ?p > ?e. B. ?p = ?e. C. ?p < ?e.
The concept of uniformitarianism was developed by ______________, the "father of geology."
Fill in the blank(s) with correct word
A car travels on a road that, if viewed from the side, has a semicircular dip. When at the bottom of the dip, the occupants of the car feel as though they weigh twice their normal weight. What is the radius of the semicircle if the speed of the car is 27 m/s?
A. 37 m B. 132 m C. 149 m D. 74 m
A car moving at a steady 10 m/s on a level highway encounters a bump that has a circular cross-section with a radius of 30 m
The car maintains its speed over the bump. What is the force exerted by the seat of the car on a 60.0-kg passenger when the car is at the top of the bump? A) 200 N B) 390 N C) 790 N D) 490 N E) 590 N