The auroral displays occur in our ________
Fill in the blank(s) with correct word
ionosphere
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Spherical Mirrors: An object is in front of a concave spherical mirror, and its image is 4.0 cm behind the mirror. If the focal length of the mirror has a magnitude of 5.0 cm, where is the object?
A. 2.2 cm in front of the mirror B. 2.2 cm behind the mirror C. 9.0 cm in front of the mirror D. 1.0 cm behind the mirror
A brass rod, 75.0 cm long and having a cross-sectional area of 2.50 cm2, conducts heat from a large furnace at 375°C into a very large cold water bath at 10.0°C
without losing any heat at the lateral surface of the rod. Steady state has been established, and the thermal conductivity of brass is 109 W/m?K. The rate at which the entropy of the system (furnace plus water) is changing is closest to A) 2.05 × 10-2 W/K. B) 2.64 × 10-2 W/K. C) 3.54 × 10-2 W/K. D) 4.69 × 10-2 W/K. E) 6.74 × 10-2 W/K.
Briefly explain why radiation was trapped for 380,000 years during the era of nuclei, and why the cosmic background radiation was formed at the end of this era
What will be an ideal response?
In the figure, if F = 2.0 N and M = 1.0 kg, what is the tension in the connecting string? The pulley and all surfaces are frictionless.
?
?
A. 2.6 N B. 1.1 N C. 2.1 N D. 1.6 N E. 3.7 N