An instrument is thrown upward with a speed of 15 m/s on the surface of planet X where the acceleration due to gravity is 2.5 m/s2 and there is no atmosphere. How long does it take for the instrument to return to where it was thrown?
A) 12 s B) 6.0 s C) 10 s D) 8.0 s
A
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Two experiments are performed. In (A), an 18.0-N force pushes horizontally on a 2.00-kg block that then pushes on a 4.00-kg block. In (B), an 18.0-N force pushes on a 4.00-kg block that then pushes on a 2.00-kg block. Which statement is correct?
a. The acceleration is 3.00 m/s2 in both (A) and (B). b. The acceleration is 4.50 m/s2 in both (A) and (B). c. The acceleration is 6.00 m/s2 in both (A) and (B). d. The acceleration is 9.00 m/s2 in both (A) and (B). e. The 2.00-kg block has a 9.00 m/s2 acceleration. The 4.00-kg block has a 4.50 m/s2 acceleration.
A light ray in water passes into air. The angle of incidence in the water is 40°. What is the angle of refraction in air if the index of refraction of water is 1.33?
A) 59° B) 0.59° C) 40° D) 1.33° E) 29°
Relate the formation of Mercury's scarps to its differentiation
What will be an ideal response?
How long ago did multicellular life forms appear in the fossil record?
A) 4.5 billion years ago B) 3.8 billion years ago C) one billion years ago D) 63 million years ago E) 30 million years ago