An unfueled 1000-kg experimental rocket sled on level frictionless rails is loaded with 50 kg of propellant. It exhausts the propellant in a 20 s "burn.". If the rocket, initially at rest, moves at 160 m/s after the burn, what impulse is experienced by the rocket sled?
a. 1.1 × 10^5 kg•m/s
c. 1.5 × 10^5 kg•m/s
b. 1.6 × 10^5 kg•m/s
d. 1.9 × 10^5 kg•m/s
B
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Hydrogen fusion in the Sun requires a temperature (in Kelvin) of
A) trillions of degrees. B) any temperature, as long as gravity is strong enough. C) thousands of degrees. D) billions of degrees. E) millions of degrees.
The electric field in the region defined by the y-z plane and the negative x axis is given by E = ?ax, where a is a constant. (There is no field for positive values of x.) As ?x increases in magnitude, relative to V = 0 at the origin, the electric potential in the region defined above is
a. a decreasing function proportional to ?|x2|. b. a decreasing function proportional to ?|x|. c. constant. d. an increasing function proportional to +|x|. e. an increasing function proportional to +|x2|.
The figure shows a distance vs. time graph of an object with three distinct regions, I, II, and III
?
The object’s acceleration is zero in region(s)
a.
I.
b.
II.
c.
III.
d.
no regions
The diagram below shows three approximate locations of the sun along the western horizon. Which number indicates the location of the sun at sunset on the vernal equinox for an observer at a latitude of 48° S?
a. 1
b. 2
c. 3
d. The sun will set in the east for an observer in the southern hemisphere.
e. The sun will not set on vernal equinox at this latitude.