Which of the following best describes the purpose of WAI guidelines?
A. To define a web-safe color palette.
B. To centralize the domain name registration process.
C. To ensure accessibility of webpage content.
D. To encourage mobile-first web design strategy.
Answer: C
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Impulse: A 0.17-kg baseball is thrown with a speed of 38 m/s and it is hit straight back toward the pitcher with a speed of 62 m/s. What is the magnitude of the impulse exerted upon the ball by the bat?
Fill in the blank(s) with the appropriate word(s).
Red light with a wavelength of 650. nm travels from air into a liquid with an index of 1.33. What is the frequency and wavelength in the liquid?
What will be an ideal response?
Which of the following can't be associated with the spiral arms of a galaxy?
a. Dust and gas b. Metal poor stars c. Young, massive stars d. Star formation
Calculate the half-value thickness (in mm) of lead if it reduces the intensity of a beam of x-rays whose wavelength is 10 pm by a factor of two. (Assume the linear absorption coefficient of lead is 43 cm?1 for x-rays of wavelength 10 × 10^?12 m.)
a. 0.24 b. 0.20 c. 0.12 d. 0.16 e. 0.18