A drawback to mining sulfides is the risk of _______________.

a. underground fires
c. “rock bursts”
b. tunnel collapse
d. acid mine runoff


Answer: d. acid mine runoff

Physics & Space Science

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The Babcock model employs differential rotation of the solar surface and a magnetic dynamo to describe the formation of sunspots

Indicate whether the statement is true or false

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Thin Films: A 360-nm thick oil film floats on the surface of a pool of water water. The indices of refraction of the oil and the water are 1.5 and 1.33, respectively. When the surface of the oil is illuminated from above at normal incidence with white light, what are the two wavelengths of light between 400 nm to 800 nm wavelength that are most strongly reflected?

A. 410 nm and 700 nm B. 430 nm and 720 nm C. 450 nm and 740 nm D. 470 nm and 760 nm E. 490 nm and 780 nm

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A 10.0-m-long copper wire with cross-sectional area 1.25 × 10^–4 m2 is bent into a square loop, and then connected to a 0.25-V battery. The loop is then placed in a uniform magnetic field of magnitude 0.19 T. What is the maximum torque that can act on this loop? The resistivity of copper is 1.70 × 10^–8 ?·m

a. 2.2E+2 N·m b. 1.8E+2 N·m c. 9.7E+2 N·m d. 5.6E+2 N·m

Physics & Space Science

The position of an object that is oscillating on an ideal spring is given by x = (17.4 cm) cos[(5.46 s-1)t]. Write an expression for the velocity of the particle as a function of time using the sine function

What will be an ideal response?

Physics & Space Science