An earthquake P wave travels through
a. the inner core only.
b. the mantle only.
c. the outer core only.
d. all of these.
d
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Conduction: The thermal conductivity of aluminum is twice that of brass. Two rods (one aluminum and the other brass) of the same length and cross-sectional area are joined together end to end. The free end of the brass rod is maintained at 0°C and the free end of the aluminum rod is maintained at 200°C. If no heat escapes from the sides of the rods, what is the temperature at the place where the two rods are joined together?
A. 76°C B. 133°C C. 148°C D. 155°C
A 6.0-kg object moving 5.0 m/s collides with and sticks to a 2.0-kg object. After the collision the composite object is moving 2.0 m/s in a direction opposite to the initial direction of motion of the 6.0-kg object. Determine the speed of the 2.0-kg object before the collision
a. 15 m/s b. 7.0 m/s c. 8.0 m/s d. 23 m/s e. 11 m/s
A spacecraft (mass = m1) orbits a planet (mass = m2) in a circular orbit (radius = r). What is the minimum energy required to send this spacecraft to a distant point in space where the gravitational force on the spacecraft by the planet is negligible?
A. Gm1m2/(4r) B. Gm1m2/R C. Gm1m2/(2R) D. Gm1m2/(3R) E. 2Gm1m2/(5R)
A ball is thrown vertically upward with an initial speed of 20 m/s. Two seconds later, a stone is thrown vertically (from the same initial height as the ball) with an initial speed of 24 m/s. At what height above the release point will the ball and stone pass each other?
A. 17 m B. 21 m C. 18 m D. 27 m E. 31 m