A 100-kg spacecraft has a sail of area 300 m2 that is absorbing sunlight of intensity 800 W/m2 . What is the resulting acceleration of the spacecraft?
a. 2.4 m/s2 b. 2.7 × 10^–6 m/s2
c. 8.0 × 10^–6 m/s2 d. 3.8 × 10^–5 m/s2
c
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Two objects, one of mass m and the other of mass 2m, are dropped from the top of a building. Assuming there is no air resistance, when they hit the ground
A) both will have the same kinetic energy. B) the heavier one will have twice the kinetic energy of the lighter one. C) the heavier one will have four times the kinetic energy of the lighter one. D) the heavier one will have half the kinetic energy of the lighter one. E) the heavier one will have one-fourth the kinetic energy of the lighter one.
In free space, electromagnetic waves travel at a
A) variety of speeds. B) single speed. C) speed depending on frequency.
The medical diagnostic technique PET stands for
a. proton energizing test. b. phosphorus electron tracing. c. precision electronic tracking. d. positron emission tomography.
There are currently considered to be _________ basic building blocks for elementary particles and _________ different forces in the universe
a. 4 / 25 b. 8 / 4 c. 4 / 8 d. 6 / 4 e. 25 / 4