Which of the following properties can be inferred from the star's orbital period?
What will be an ideal response?
the planet's orbital radius
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Which scientist built a radio transmitting tower at the turn of the 20th century and claimed that he was receiving interplanetary communications with it?
A) Guglielmo Marconi B) Thomas Edison C) Nikola Tesla D) Grote Reber
A chocolate chip cookie is a good example of
a. a compound. b. an element. c. a homogeneous mixture. d. a heterogeneous mixture.
General Questions: The figure shows two boxes, with m1 > m2, that are on a level frictionless surface. We can apply a horizontal force 
either toward the right on m1 or toward the left on m2. The magnitude of the force that the boxes exert on each other is
A. zero newtons in either case.
B. larger if 
is applied toward the right.
C. larger if 
is applied toward the left.
D. the same in either case.
The precision and number of significant figures in 1.003 km is
A. precision = .0001 km, significant figure = 4. B. precision = .001 km, significant figure = 4. C. precision = .0001 km, significant figure = 3. D. precision = .001 km, significant figure = 3. E. precision = .0001 km, significant figure = 2.