A 0.20-km wide river has a uniform flow speed of 3.0 m/s toward the east. A boat with a speed of 8.0 m/s relative to the water leaves the south bank and heads in such a way that it crosses to a point directly north of its departure point. How long does it take the boat to cross the river?
a. 29 s
b. 23 s
c. 25 s
d. 27 s
e. 17 s
D
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The surface of the Sun has a temperature of about 5 770 K. If the radius of the Sun is 7 × 10^8 m, determine the power output of the Sun. (Take e = 1, and ? = 5.67 × 10^?8 W/m2/K4)
a. 3.9E+26 W b. 1.2E+26 W c. 6.7E+22 W d. 2.2E+30 W e. 5.5E+17 W
Four identical particles (mass of each = 0.40 kg) are placed at the vertices of a rectangle (2.0 m × 3.0 m) and held in those positions by four light rods which form the sides of the rectangle. What is the rotational inertia of this rigid body about an axis that passes through the mid-points of the longer sides and is parallel to the shorter sides?
A. 2.7 kg?m2 B. 3.6 kg?m2 C. 3.1 kg?m2 D. 4.1 kg?m2 E. 1.6 kg?m2
Why can't a massive star generate energy through iron fusion?
What will be an ideal response?
The ____________________ of a star can be determined from its color
Fill in the blank(s) with correct word