Consider the following situations:
· a car slowing down at a stop sign
· a ball being swung in a circle at constant speed
· a vibrating string
· the Moon orbiting the Earth
· a skydiver falling at terminal speed
· an astronaut in an orbiting space station
· a ball rolling down a hill
· a person driving down a straight section of highway at
constant speed with her foot on the accelerator
· a molecule in the floor of this room
In how many of the situations is the object accelerating?
1.One of the situations.
2.Two of the situations.
3.Three of the situations.
4.Four of the situations.
5.Five of the situations.
6.Six of the situations.
7.Seven of the situations.
8.Eight of the situations.
9.Nine of the situations.
10.None of the situations.
7
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For life to have existed continually on the Earth for the past 4 billion years, the oceans must have been
A) completely liquid for this entire time B) frozen for most of this time C) partially liquid for most of this time D) partially frozen for most of this time
Two frisky otters slide down frictionless hillsides of the same height but different slopes. The slope of the hill of otter 1 is 30°, while the slope of the hill of otter 2 is 60°
If both start from rest, which otter is moving faster when she reaches the bottom of her hill? A) Otter 1 is moving faster. B) Otter 2 is moving faster. C) The heavier otter is moving faster, no matter which hill she used. D) Both otters have the same speed at the bottom. E) The otter that took the shorter time is moving faster.
Which statement below about the distance between the starting and ending positions and the displacement between the starting and ending positions is correct?
A) The distance between the starting and ending positions is twice the magnitude of the displacement between the starting and ending positions. B) The distance between the starting and ending positions is equal to the magnitude of the displacement between the starting and ending positions. C) The distance between the starting and ending positions is the negative of the magnitude of the displacement between the starting and ending positions. D) The distance between the starting and ending positions is greater than the magnitude of the displacement between the starting and ending positions. E) The distance between the starting and ending positions is less than the magnitude of the displacement between the starting and ending positions.
Why is the Schrödinger equation so much simpler to solve for electrons in atoms like H and He+ than for Na or even B+?