From the 1970s to the present, the accepted value of H has almost doubled, so
A) the age of the universe is twice as old as we originally believed.
B) the age of the Universe is half what we believed.
C) the Copernican principle is not valid beyond our solar system.
D) the ages of the oldest globular clusters are invalid.
E) the critical density must also be halved.
B
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Write the equation of a wave, traveling along the +x axis with an amplitude of 0.02 m, a frequency of 440 Hz, and a speed of 330 m/sec
a. y = 0.02 sin [880p(x/330 - t)] b. y = 0.02 cos [880p x/330 - 440t] c. y = 0.02 sin [880p(x/330 + t)] d. y = 0.02 sin [2p(x/330 + 440t)] e. y = 0.02 cos [2p(x/330 + 440t)]
An unfueled 1000-kg experimental rocket sled at rest on level frictionless rails is loaded with 50 kg of propellant. It exhausts the propellant in a 20 s "burn.". The rocket moves at 160 m/s after the burn. What average force is experienced by the rocket during the burn?
a. 0.80 × 10^4 N c. 0.60 × 10^4 N b. 0.75 × 10^4 N d. 0.35 × 10^4 N
The current in an electron beam in a cathode-ray tube is measured to be 280 µA. How many electrons hit the screen in 50 s? (e = 1.6 × 10^-19 C)
a. 2.2 × 10^11 electrons c. 8.8 × 10^15 electrons b. 8.8 × 10^16 electrons d. 2.2 × 10^15 electrons
A recent sunspot maximum occurred in 2001 . What is the year of the sunspot maximum that immediately follows the 2001 maximum if the solar cycle continues?
a. 2006 or 2007 b. 2012 c. 2018 d. 2023 e. the last cycle started a Maunder minimum and the next maximum cannot be predicted.