________________ compression retains all the image data during compression.
A. Opaque
B. High resolution
C. Artifact
D. Lossless
Ans: D. Lossless
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A 5.00 gram bullet has a velocity of 300 m/s. It strikes a block of wood and penetrates to a distance of 10.0 cm. The average force of the block of wood on the bullet is
A. 1,500 N. B. 1,750 N. C. 1,870 N. D. 2,030 N. E. 2,250 N.
Again consider two twin sisters, Gwen and Jackie, who are both 20 years old in the year 2020. This time, assume that Jackie makes the round-trip to Vega, which is 25 light-years away, at an average speed of 0.9999c
Which of the following correctly describes the situation when Jackie returns to Earth? (Ages in this problem refer to biological ages—that is, how much time has passed for each sister since she was born.) A) It's the year 2070. Gwen (who stayed home) is 70 years old, but Jackie is only a little older than her age of 20 when she left. B) It's the year 2070 and both twin sisters are 70 years old. C) It's the year 2070. Gwen is 70 years old. Jackie is 19. D) According to Gwen, Jackie returns to Earth in the year 2070, but according to Jackie, she returns in the year 2021.
Why are Uranus and Neptune so blue?
A. The planets are very hot, so their blackbody spectra peak at blue wavelengths. B. Hydrogen appears blue when it reflects sunlight. C. Methane in their atmospheres absorb red light and reflect blue light. D. They reflect blue light from their moons.
To describe the relationship between the stress and strain for a cube of Jello when it jiggles from side to side, which of the following would we use?
1.the shear modulus 2.the bulk modulus 3.Young's modulus 4.none of these