Why won't Pluto collide with Neptune?
A) Pluto is always much farther from the Sun than Neptune.
B) Pluto orbits the Sun exactly 2 times for every 3 Neptune orbits, which ensures they never come close together.
C) Pluto's orbit never comes anywhere close to Neptune's orbit.
D) Actually, a collision of the two is inevitable within the next billion years.
B
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How do we know that chlorine caused the ozone hole?
A) From measurements of the relationship between the experimental release of chlorine from the land surface in Antarctica, and the depletion of ozone that appeared in the atmosphere a few days later. B) From laboratory experiments involving a replica of the atmosphere over Antarctica. C) From the relationship between the release of chlorine by the Pinatubo volcano and the depletion of ozone over Antarctica a few months later. D) From theories of the chemical destruction of ozone, coupled with computer calculations. E) From measurements of chlorine monoxide and ozone in the Antarctic atmosphere as the sun reappeared in the spring.
A ball thrown upwards reaches a maximum height and then comes back down to the original level. As the ball is going downwards
a. the velocity and acceleration both point up. b. the velocity points up and the acceleration down. c. the velocity points down and the acceleration up. d. the velocity and acceleration both point down. e. the acceleration is zero.
The coefficient of static friction between the tires of a car and the street is ?s = 0.70 . Of the following, what is the steepest inclination angle of a street on which a car can be parked (with wheels locked) without slipping?
a. 30° b. 40° c. 35° d. 45° e. 32°
Nuclear fusion within the Sun proceeds step by step in a series of reactions called the neutron–neutron chain
a. True b. False Indicate whether the statement is true or false