A(n) ______________ force is necessary for uniform circular motion
Fill in the blank(s) with correct word
centripetal
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What is Tunguska?
A) the site of an asteroid impact that occurred in Siberia in 1908 B) a postulated binary companion to the Sun thought to be responsible for mass extinctions C) a long period comet that struck Jupiter in 1994 D) the Gulf of Mexico basin that is the crater of the asteroid impact that caused the mass extinction of the dinosaurs 65 million years ago E) a newly discovered moon of Pluto
If the density of the universe is equal to the critical density, and H equals 50 km/sec/Mpc, then the true age of the universe is 13.3 billion years
Indicate whether the statement is true or false
A 2-kg mass weighs 20 N and is held 4 m above the ground. Its potential energy relative to the ground is
A) 8 J. B) 20 J. C) 60 J. D) 80 J. E) none of the above
A dictator has built a bunker for his use in emergencies. Its dimensions are shown below. When it floods to ground level during a tropical storm, the gauge pressure at point A, in Pa, is
a.
3.92 × 105.
b.
4.90 × 105.
c.
5.39 × 105.
d.
5.88 × 105.
e.
6.89 × 105.