In a positively-curved Universe (the surface of Earth has positive curvature), the angles of a triangle add up to
A. exactly 180 degrees.
B. less than 180 degrees.
C. more than 180 degrees.
Answer: C
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A 0.60-kg object is suspended from the ceiling at the end of a 2.0-m string. When pulled to the side and released, it has a speed of 4.0 m/s at the lowest point of its path. What maximum angle does the string make with the vertical as the object swings up?
a. 61° b. 54° c. 69° d. 77° e. 47°
The x component of the velocity of an object vibrating along the x-axis obeys the equation vx(t) = (0.445 m/s) sin[(25.4 rad/s)t + 0.223]
(a) What is the amplitude of the motion of this object? (b) What is the maximum acceleration of the vibrating object?
A uniform linear charge density of 4.0 nC/m is distributed along the entire x axis. Consider a spherical (radius = 5.0 cm) surface centered on the origin. Determine the electric flux through this surface
a. 68 N × m2/C b. 62 N × m2/C c. 45 N × m2/C d. 79 N × m2/C e. 23 N × m2/C
Relative to a stationary observer, a moving object
A) appears shorter than normal. B) appears longer than normal. C) keeps its same length. D) can do any of the above. It depends on the relative velocity between the observer and the object. E) can do any of the above. It depends on the relative energy between the observer and the object.