If the Earth's North polar axis is always tilted 23.5 degrees toward the Sun, but the Earth is still rotating about this axis once each day:
A) it would always be winter in the Southern hemisphere
B) it would always be summer in the Southern hemisphere
C) the stars would never be visible from anywhere in the Northern hemisphere
D) the stars would never be visible from anywhere in the Southern hemisphere
E) the days would be longer in the Southern hemisphere
Answer: A) it would always be winter in the Southern hemisphere
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The diagram below shows the position of a long straight wire perpendicular to the page and a set of directions labeled A through H. When the current in the wire is directed up out of the page, the direction of the magnetic field at point P is
A. D. B. E. C. F. D. G. E. H.
The only force acting on a 2.0-kg body as it moves along the x axis is given by Fx = (12 ? 2.0x) N, where x is in m. The velocity of the body at x = 2.0 m is 5.5 
m/s. What is the maximum kinetic energy attained by the body while moving in the +x direction?
A. 36 J B. 39 J C. 43 J D. 46 J E. 30 J
A soap bubble has an index of refraction of 1.33. What minimum thickness of this bubble will ensure maximum reflectance of normally incident 530 nm wavelength light?
A) 24.9 nm B) 76.9 nm C) 99.6 nm D) 199 nm E) 398 nm
A steel guitar string with a diameter of 0.300 mm and a length of 70.0 cm is stretched by 0.500 mm while being tuned. How much force is needed to stretch the string by this amount? Young's modulus for steel is 2.0 × 1011 N/m2
What will be an ideal response?