Why don't the nuclei of atoms contain any types of quarks but ups and downs?
A: Those are the only kind of quarks that exist.
B: Only those types of quarks have positive charges.
C: Only those types of quarks have negative charges.
D: The other flavors are not massive enough.
E: The other flavors do not live for very long.
Ans: E: The other flavors do not live for very long.
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A boat travels upstream and after one hour has gone 10 km. The boat next travels downstream and after one hour has gone 18 km. If the boat's speed relative to the water is constant, what is the speed of the current in the river?
a. 3 km/h b. 4 km/h c. 5 km/h d. 6 km/h e. 7 km/h
A nearsighted man wears contact lenses of -3.00 diopters. With these lenses, his corrected near point is 25.0 cm. What is his uncorrected near point?
What will be an ideal response?
A 4.00 kg ball is traveling at 3.00 m/s and strikes a wall. The 4.00 kg ball bounces off the wall with a velocity of 4.0 m/s. If the contact with the wall by the ball lasts for 0.10 seconds, then the average force on the ball is
A. 230 N. B. 280 N. C. 320 N. D. 360 N. E. 400 N.
Hydrocarbon fuels come from
A) the original geological processes that formed planet Earth billions of years ago. B) lava flows from volcanoes that erupted millions of years ago. C) Disneyland. D) hydrocarbon ores that are mined and then milled in order to extract the small fraction of hydrocarbon in them. E) the remains of plants and animals that died millions of years ago.