A rod of 2.0-m length and a square (2.0 mm × 2.0 mm) cross section is made of a material with a resistivity of 6.0 × 10^?8 ? / m. If a potential difference of 0.50 V is placed across the ends of the rod, at what rate is heat generated in the rod?
a. 3.0 W
b. 5.3 W
c. 8.3 W
d. 1.3 W
e. 17 W
c
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A star can be a supernova
A) in predictable cycles of decades. B) a few times, at unpredictable intervals. C) only if it can fuse iron in its core. D) before it reaches the main sequence, if it is massive enough. E) only once.
Vector is 5.5 cm long and points along the x axis. Vector is 7.5 cm long and points at +30° above the negative x axis
(a) Determine the x and y components of Vector . (b) Determine the x and y components of Vector . (c) Determine the sum of these two vectors in terms of components. (d) Determine the sum of these two vectors in terms of magnitude and direction.
A fluid has a density of 1 040 kg/m3 . If it rises to a height of 1.60 cm in a 1.50-mm diameter capillary tube, what is the surface tension of the liquid? Assume a contact angle of zero
a. 0.0612 N/m b. 0.122 N/m c. 6.12 N/m d. 0.245 N/m e. 12.2 N/m