Which of the following are not found on Venus?
a. arachnoids
b. coronae
c. rolling plains
d. lobate scarps
e. high atmospheric pressure
D
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A long cylindrical rod, 8 cm in diameter, is initially at a uniform temperature of 20°C. At time t = 0, the rod is exposed to an ambient temperature of 400°C through a heat transfer coefficient of 20 W/(m2 K). The thermal conductivity of the rod is 0.8 W/(mK) and the thermal diffusivity is 3 × 10–6 m2/s. Determine how much time will be required for the temperature change at the centerline of the rod to reach 93.68% of its maximum value. Use an explicit difference equation and compare your numerical results with a chart solution.
GIVEN • Cylindrical rod suddenly exposed to increased ambient temperature FIND (a) Time required for the centerline temperature change to reach 93.68% of its maximum value
The ratio of kinetic energy of object A to the kinetic energy of object B is 2:1. Object A is moving with a speed of 6.0 m/s and object B is moving with a speed of 2.0 m/s. If the mass of object A is 4.0 kg then what is the mass of object B?
A) 2.0 kg B) 4.0 kg C) 8.0 kg D) 18 kg E) 16 kg
According to the Stefan–Boltzmann law, an object at room temperature that is sitting in a room (also at room temperature) must emit electromagnetic radiation. Since it is losing energy by emitting this radiation, why does its temperature remain constant?
A. It receives heat by conduction from the air and from what it is sitting on. B. It receives heat by convection from the air. C. It receives heat by radiation from objects in the room. D. All of the above. E. Its temperature actually does decrease. F. It does not actually emit any radiation. T. Some other explanation (specify)
A light-emitting diode (LED) converts electricity to approximately sinusoidal electromagnetic waves with a definite frequency f. Imagine that light from the LED creates an oscillating electric field with amplitude E0 at a certain location. If we increase the electrical power to the LED so that the oscillation amplitude is now 2E0, by what factor have we increased the power?
A. 4 times
B. 2 times
C. 
times
D. One cannot answer without more information.