A heavy block at rest is suspended by a vertical rope. When the block is accelerated upward by the rope, the rope tension
A) is less than its weight.
B) equals its weight.
C) is greater than its weight.
Answer: C
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Which of the following sequences of electromagnetic radiation is arranged in the order of increasing energy?
A) Gamma rays, X-rays, infrared radiation, and radio waves B) Radio waves, microwaves, gamma rays, and ultraviolet radiation C) Visible light, ultraviolet radiation, X-rays, and gamma rays D) Visible light, microwaves, radio waves, and infrared radiation
The composition of the interstellar dust suggests that it is formed primarily in the atmospheres of cool stars
a. True b. False Indicate whether the statement is true or false
Pour vinegar onto beach sand from the Caribbean and the result is a lot of froth and bubbles. Pour vinegar onto beach sand from California, however, and nothing happens. Why?
A) Beaches in tropical climates generally have remnants of volcanic deposit not present in California sand. These deposits contain soil with organic residue. Vinegar's acetic acid reacts with organic matter. B) The pH of the warm sands of tropical waters is well into the basic range, unlike the beach sand in California. Therefore, the acidic vinegar reacts with Caribbean beach sand but not with sand from California. C) Beach sand from the Caribbean and many other tropical climates is made primarily of the calcium carbonate remains of coral and shelled creatures. Vinegar is an acid and the calcium carbonate is a base. D) Caribbean beach sand contains deposits from the mouth of the Mississippi river which carries with it a great deal of contamination from urban waste. These warm water contaminates react with the acid in vinegar.
A 4 ft radius spherical container holds helium gas at 20 psia and 95ºF. Estimate the amount of helium lost through diffusion in 24 hours if the sphere is made of silicon dioxide, SiO2 (glass) and if it is assumed that at a point 1/8 inches into the container wall from the inside the concentration of helium is zero.
What will be an ideal response?