What is the primary way in which stars with masses similar to the Sun ultimately return some of their material to the interstellar medium?
A) by exploding as white dwarf supernovae
B) through jets they may have during the protostar stage
C) through planetary nebulae
D) through the winds they have during their main-sequence lives
E) Stars with masses similar to the Sun do not recycle any material back into the interstellar medium.
C) through planetary nebulae
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A long solenoid (n = 1200 turns/m, radius = 2.0 cm) has a current of a 0.30 A in its winding. A long wire carrying a current of 20 A is parallel to and 1.0 cm from the axis of the solenoid. What is the magnitude of the resulting magnetic field at a point on the axis of the solenoid?
A. 0.60 mT B. 0.85 mT C. 52 ?T D. 0.40 mT E. 0.75 mT
Suppose Earth's axis tilt was significantly greater than its current 23.5 degrees, but Earth's rotation period and orbital period were unchanged. Which statement below would not be true?
A) Summers and winters would be more severe (for example, hotter and colder, respectively) than they are now. B) The region of Earth where the Sun does not rise on the winter solstice would be larger (extending farther south) than it is now. C) The length of each season (for example, the number of days from the summer solstice to the fall equinox) would be significantly longer than it is now. D) Polaris would not be our North star.
A 1200-kg ore cart is rolling at 10.8 m/s across a flat friction-free surface. A crane suddenly drops of ore vertically into the cart. How fast does the cart move just after being loaded with the ore?
A) 5.70 m/s B) 4.20 m/s C) 6.30 m/s D) 3.80 m/s