The paths of fragments of fireworks are
A) normally straight lines.
B) parabolas.
C) different from the paths of projectiles.
Answer: B
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How many grams of ethanol (specific gravity 0.80 ) should be added to 5 grams of chloroform (specific gravity 1.50 ) if the resulting mixture is to have a specific gravity of 1.20?
A) 2.0 gms B) 2.4 gms C) 1.8 gms D) 4.4 gms E) 1.6 gms
A spaceship moves away from the Earth with a speed of 0.80c. The spaceship then fires a missile with a speed of 0.50c relative to the spaceship
(a) What is the velocity of the missile measured by observers on the Earth if the missile is fired away from the Earth? (b) What is the velocity of the missile measured by observers on the Earth if the missile is fired toward the Earth?
In contrast to the outer solid mantle, parts of the central regions of Earth's interior are thought to be fluid because
a. P seismic waves cannot make it through those regions. b. S seismic waves cannot make it through those regions. c. neither P nor S seismic waves can make it through those regions. d. both P and S seismic waves easily make it through those regions.
A 160 lb person has a mass of 160/32 = 5 slugs. A 160-lb person steps into an elevator and stands on a bathroom scale. Determine the scale reading for the given scenarios. The elevator accelerates upwards and is now moving at a constant speed
a. 150 lb b. 160 lb c. 170 lb d. none of the above