Say you are in the bottom of Happy Valley. How does the force ofgravity compare towhat it would be on top of Mount Nittany?
a) two times less in Happy Valley than on Mount Nittany
b) two times greater in Happy Valley than on Mount Nittany
c) slightly greater in Happy Valley than on Mount Nittany
d) exactly equal in Happy Valley and on Mount Nittany
e) slightly less in Happy Valley than on Mount Nittany
Ans: c) slightly greater in Happy Valley than on Mount Nittany
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A block of mass M slides down a frictionless plane inclined at an angle ? with the horizontal. The normal reaction force exerted by the plane on the block is
A) Mg. B) Mg sin ?. C) Mg cos ?. D) Mg tan ?. E) zero, since the plane is frictionless.
You want to have an electron in an energy level where its speed is no more than 66 m/s
What is the length of the smallest box (an infinite well) in which you can do this? (h = 6.626 × 10-34 J ? s, mel = 9.11 × 10-31 kg) A) 5.5 µm B) 11 µm C) 2.8 µm D) 1.4 µm
What best describes what happens when an acid such as HCl is mixed with water?
A) The proton chemically bonded to the chlorine is transferred to a water molecule and forms a chloride ion and a hydronium ion. B) A proton from the chlorine nucleus is ejected and captured by a water molecule to form a negatively charged HCl and a new hydronium ion. C) A hydroxide ion from the water is transferred to the HCl molecule to form a proton and hydronium ion. D) HCl is not an acid. E) none of the above
A new star is forming inside this glowing cloud of gas. The dark band in the middle is made of a disk of thick dust, which obscures the light within it and hides the forming star from view. Newly forming stars are surrounded by gas and dust. Based on this observation--and your previous observations about the relative orbits, positions, and sizes of the planets--what is the most likely scenario for the formation of the Solar System?
Choose one: A. A cloud of gas and dust collapsed into a flattened disk, within which the Sun and planets formed. B. Two stars collided and broke apart to form the Sun and the planets. C. A cloud of gas and dust collapsed into a spherical shape, within which the Sun and planets formed. D. The Sun formed by itself from a collapsing cloud of gas and dust, then later gravitationally captured the planets as they happened to pass by.