A satellite moves east, taken as the positive x axis direction, at a speed of 0.5c and a spaceship moves toward it (to the west) at a speed of 0.8c as measured by an observer on the Earth. The speed of the satellite measured by an observer in the spaceship is
a. 8.7c.
b. 0.21c.
c. ?0.21c.
d. 0.93c.
e. ?0.93c.
d
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The position of a particle moving along the x axis is given by x = (21 + 22t ? 6.0t2) m, where t is in s. What is the average velocity during the time interval t = 1.0 s to t = 3.0 s?
a. ?6.0 m/s b. ?4.0 m/s c. ?2.0 m/s d. ?8.0 m/s e. 8.0 m/s
Which one of the following is the SI unit for the magnetic field?
a) monopole (MP) b) tesla (T) c) fermi (Fm) d) gross (G) e) Oersted (oe)
If you double the thickness of a wall built from a homogeneous material, the rate of heat loss for a given temperature difference across the thickness will
A) become one-half its original value. B) double. C) become one-fourth its original value. D) quadruple. E) become one-eighth its original value.
A stone is thrown at an angle of 30° above the horizontal from the top edge of a cliff with an initial speed of 8.0 m/s. A stop watch measures the stone's trajectory time from top of cliff to bottom to be 5.9 s. How far out from the cliff's edge does the stone travel horizontally? (g = 9.8 m/s2 and air resistance is negligible)
a. 41 m b. 27 m c. 300 m d. 130 m