The theory of matter waves was first developed by
a) Heisenberg
b) Einstein
c) Schrödinger
d) de Broglie
c
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A ball is projected upward at time t = 0.00 s, from a point on a roof 70 m above the ground and experiences negligible air resistance. The ball rises, then falls and strikes the ground. The initial velocity of the ball is 28.5 m/s
Consider all quantities as positive in the upward direction. The velocity of the ball when it is 39 m above the ground is closest to A) -38 m/s. B) -30 m/s. C) -23 m/s. D) -15 m/s. E) -45 m/s.
How likely is oil shale to be a component of the U.S. energy policy? Explain
What will be an ideal response?
Suzie Skydiver jumps from a high-flying plane. As her velocity of fall increases, her acceleration
A) increases. B) decreases. C) remains unchanged regardless of air resistance.
A small dam, which may be idealized by a large slab 1.2 m thick, is to be completely poured in a short period of time. The hydration of the concrete results in the equivalent of a distributed source of constant strength of 100 W/m3 . If both dam surfaces are at 16°C, determine the maximum temperature to which the concrete will be subjected, assuming steady-state conditions. The thermal conductivity of the wet concrete may be taken as 0.84 W/(m K).
GIVEN
FIND
The maximum temperature (Tmax)
ASSUMPTIONS
Steady state conditions prevail
SKETCH
