A cantilever wood pole carries force P 5 300 N applied at its free end, as well as its own weight (weight density 5 6 kN/m3). The length of the pole is L 5 0.75 m and the allowable bending stress is 14 MPa. The required diameter of the pole is approximately:
(A) 4.2 cm
(B) 5.5 cm
(C) 6.1 cm
(D) 8.5 cm
(B) 5.5 cm
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Semiconductors: The energy gap between the valence and conduction bands in a certain semiconductor is 1.25 eV. What is the threshold wavelength for optical absorption in this substance? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
A. 599 nm B. 959 nm C. 873 nm D. 994 nm
All the planets orbit the Sun in the ________ plane
Fill in the blank(s) with correct word
The most abundant element in Earth's core is ________.
A. iron B. hydrogen C. oxygen D. nitrogen
Solar houses use a variety of energy storage devices to retain the thermal energy absorbed during the day so that it can be released during the night
Suppose that you were to use a device of this kind to produce steam at 100°C during the day, and then allow the steam to cool to 0°C and freeze during the night. How many kilograms of water would be needed to store 20.0 kWh of energy in this way? The latent heat of vaporization of water is 22.6 × 105 J/kg, the latent heat of fusion of water is 33.5 × 104 J/kg, and the specific heat of water is 4186 J/kg ? K. A) 12.4 kg B) 23.9 kg C) 35.7 kg D) 42.6 kg E) 54.2 kg