Of the possible statements that parallel rays are brought to a focus by a
1)concave mirror,2)convex mirror,3)converging lens,4)diverging lens,the correct answer is
A. 1 and 2.
B. 3 and 4.
C. 1 and 3.
D. 2 and 3.
E. 2 and 4.
Answer: C
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An unusual spring has a restoring force of magnitude F = (2.00 N/m)x + (1.00 N/m2)x2, where x is the stretch of the spring from its equilibrium length
A 3.00-kg object is attached to this spring and released from rest after stretching the spring 1.50 m. If the object slides over a frictionless horizontal surface, how fast is it moving when the spring returns to its equilibrium length? A) 2.06 m/s B) 4.33 m/s C) 3.27 m/s D) 5.48 m/s E) 1.50 m/s
The surface of Venus is hotter than the surface of Mercury because:
a) Venus is smaller than Mercury so it does not require so much energy to heat it. b) of the volcanic activity that occurs on Venus. c) Mercury's atmosphere prevents radiation from penetrating through to its surface. d) Venus is closer to the Sun than Mercury. e) Venus is more massive and is able to retain a thick atmosphere.
Valley networks are located in Mars's northern hemisphere
Indicate whether the statement is true or false
A 50.0 cm long organ pipe is filled with air at 10.0
and is open at both ends. The velocity of sound in air at 0.00 
is 331 m/s. Another 50.0 cm long organ pipe is filled with air at 15.0
and is open at both ends. What is the beat frequency between the fundamental modes of the two organ pipes?
A. 2.96 Hz B. 2.45 Hz C. 2.10 Hz D. 1.94 Hz E. 1.77 Hz