An 80-km/h airplane flying against a 10-km/h head wind has a groundspeed of
A) 10 km/h.
B) 70 km/h.
C) 80 km/h.
D) 90 km/h.
Answer: B
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According to Galileo, the acceleration of a freely falling object due to gravity is ____
a. larger if the object is dropped from a greater height b. smaller if the object is dropped from a greater height c. larger if the mass of the object is larger d. smaller if the mass of the object is larger e. the same regardless of the mass and the height from which it is dropped
Certain stars at the end of their lives are thought to collapse, combining their protons and electrons together to form a neutron star. Such a star could be thought of as a giant atomic nucleus. If a star of mass equal to M = 4.00 × 10^30 kg collapsed into neutrons (mn = 1.67 × 10^-27 kg), what would be the radius of such a star? (Hint: r = r0A1/3, where r0 = 1.20 × 10^-15 m.)
a. 12.7 km c. 16.1 km b. 25.4 km d. 18.5 km
Spacecraft have landed on all of the terrestrial worlds
Indicate whether the statement is true or false
The period T of the fundamental mode of the air in a pipe open at one end and closed at the other is equal to what multiple or fraction of the time ?t required for a sound wave to travel from one end of the tube to the other?
A. T = ?t/4 B. T = ?t/2 C. T = ?t D. T = 2?t E. T = 4?t