You hit a handball too hard, and it lands horizontally on top of a roof. If its original velocity was vo at an angle ? above the horizontal, then it lands on the roof with a velocity of
A) vo sin ?
B) 2vo
C) vo cos ?
D) zero
E) vo
C
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An asteroid in orbit about the Sun has a linear speed of 4 km/s when at a distance of closest approach d from the sun. What is its linear speed when it is at its greatest distance from the sun, a distance 4d?
a. 1 km/s c. 8 km/s b. 2 km/s d. 16 km/s
How does the Sun's mass compare with that of the planets?
A) It is a hundred times more massive than all the planets combined. B) It is a thousand times more massive than all the planets combined. C) It is about as massive as all the planets combined. D) It is a thousand times more massive than Earth. E) It is a hundred times more massive than Earth.
Which of the following modes of observation of the image of a sample in an AFM is not expected to produce atomic resolution?
(a) Contact (b) Amplitude-modulated dynamic (c) Frequency-modulated dynamic (d) Dynamic-contact or tapping
In a long, 30-cm square bar shown in the accompanying sketch, the left face is maintained at 40°C and the top face is maintained at 250°C. The right face is in contact with a fluid at 40°C through a heat transfer coefficient of 60 W/(m2 K) and the bottom face is in contact with a fluid at 250°C through a heat transfer coefficient of 100 W/(m2 K). If the thermal conductivity of the bar is 20 W/(mK), calculate the temperature at the 9 nodes shown in the sketch if the temperature distribution on the top surface of the bar varies sinusoidally from 40°C at the left edge to a maximum of 250°C in the center and back to 40°C at the right edge.
GIVEN
Square bar with one surface at fixed temperature, one surface with a specified temperature
distribution, and two surfaces with convective boundary conditions
FIND
(a) Temperature at 9 shown nodes
SKETCH
