An airplane flies in a horizontal circle of radius 500 m at a speed of 150 m/s. If the radius were changed to 1000 m, but the speed remained the same, by what factor would its centripetal acceleration change?
a. 0.25
b. 0.50
c. 1.00
d. 2.00
e. 4.00
b
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In Miller and Urey's experiment, what did they use to simulate the atmosphere in a sealed, glass container to produce amino acids and organic molecules?
a. volcanic ash b. electric arc c. water vapor d. liquid helium e. nitrogen gas
A proton, of mass m and speed v, strikes an alpha-particle (which consists of 2 protons and 2 neutrons) at rest
If the collision is completely elastic, what speed will the ?-particle have after the collision? (Assume the neutron's mass equals the proton's mass.) A) zero B) 3/2 v C) 2/5 v D) 2/3 v E) 5/3 v
A bullet is fired with a certain velocity at an angle ? above the horizontal at a location where g = 10.0 m/s2. The initial x- and y-components of its velocity are 86.6 m/s and 50.0 m/s respectively. What is the range of the bullet?
A) 500 m B) 1000 m C) 100 m D) 866 m E) 433 m
After four half-lives, the surviving tritium atoms are removed. Compared to completely new tritium atoms, they are expected to live
A. 1 /8 as long B. 1/4 as long C. 1 /2 has long D. exactly as long