A 1-kg block of iron weighs about
A) 1 N.
B) 5 N.
C) 10 N.
D) more than 10 N.
Answer: C
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Multiple-Object Accelerating Systems: Three blocks, light connecting ropes, and a light frictionless pulley comprise a system, as shown in the figure. An external force of magnitude P is applied downward on block A, causing block A to accelerate downward at a constant 2.5 m/s2. The tension in the rope connecting block B and block C is equal to 60 N.(a) What is the magnitude of the force P?(b) What is the mass of block C?
Fill in the blank(s) with the appropriate word(s).
The spectra of most galaxies show redshifts. This means that their spectral lines
A) have wavelengths that are longer than normal. B) always are in the red part of the visible spectrum. C) have wavelengths that are shorter than normal. D) have a higher intensity in the red part of the spectrum.
Which of the following statements is correct?
a. For a nearsighted person, the near point is always located closer than 25 cm from the eye and the corrective lens is diverging. b. For a nearsighted person, the near point is always located closer than infinity from the eye and the corrective lens is converging. c. For a farsighted person, the near point is always located farther than 1 m from the eye and the corrective lens is diverging. d. For a farsighted person, the near point is always located farther than 25 cm from the eye and the corrective lens is converging.
Although the United States has less than 5% of the world's population, it accounts for approximately ______________ of the world's annual consumption of fossil fuels
a. 15% b. 25% c. 35% d. 45%