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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The equator receives the same amount of sunlight from season to season
a. True b. False Indicate whether the statement is true or false
A heater is rated at 1200 watts for a 120-volt source.If two heaters are connected in parallel across the 120-volt source, the current in amperes drawn from the source is
a. 5 b. 10. c. 20 d. none of the above.
A radioactive nuclide of atomic number Z emits an electron, then the daughter nuclide emits a gamma ray. What is the atomic number of the resulting nuclide after both processes?
A) Z+1 B) Z-1 C) Z-2 D) Z-3
A super train is moving along a track at a speed close to the speed of light. You are watching the train from the ground. You observe lightning to strike in two places along the track, a mile apart, at precisely the same time
What would someone on the train say? A) The two bolts of lightning struck at different times, and they struck at places that are more than a mile apart. B) The two bolts of lightning struck at the same time, and they struck at places that are less than a mile apart. C) The two bolts of lightning struck at different times, and they struck at places that are precisely a mile apart. D) The two bolts of lightning struck at different times, and they struck at places that are less than a mile apart.