How would you expect a star that formed recently in the disk of the galaxy to differ from one that formed early in the history of the disk?
A) It should have a higher fraction of elements heavier than hydrogen and helium.
B) It should be much brighter.
C) It should be higher in mass.
D) It should orbit the galactic center at a much higher rate of speed.
E) All of the above would be expected.
A
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A radioactive isotope with an atomic number of 92 undergoes alpha decay. What is the atomic number of the daughter nucleus?
A) 93 B) 90 C) 91 D) 94
Your lab instructor projects a ball horizontally from a lab bench that lands on the floor a horizontal distance away. Compared with the time the ball would take if simply dropped vertically from the bench, the time in the air for the projected ball is
1) less. 2) the same. 3) greater. The horizontal distance from the bottom of the bench the ball travels in hitting the floor is equal the ball's initial speed 4) multiplied by its time in the air. 5) coupled with its speed of fall. 6) squared plus its downward speed squared when hitting the floor.
An auditorium has dimensions 10 m × 10 m × 60 m. How many moles of air fill this volume at one atmosphere and 0°C?
A. 2.7 × 102 B. 2.7 × 104 C. 2.7 × 103 D. 2.7 × 105 E. 2.7 × 106
A nonprismatic cantilever beam of one material is subjected to load P at its free end. Moment of inertia I2 5 2I1. The ratio r of the deflection ?B to the deflection ?1 at the free end of a prismatic cantilever with moment of inertia I1 carrying the same load is approximately:
(A) 0.25
(B) 0.40
(C) 0.56
(D) 0.78
