The coefficient of linear expansion of copper is 17 × 10-6 K-1
A block of copper 30 cm wide, 45 cm long, and 10 cm thick is heated from 0°C to 100°C What is the change in the volume of the block?
A) 2.3 × 10-5 m3
B) 4.6 × 10-5 m3
C) 5.2 × 10-5 m3
D) 6.9 × 10-5 m3
E) 13.8 × 10-5 m3
D
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A satellite moves east, taken as the positive x axis direction, at a speed of 0.5c and a spaceship moves toward it (to the west) at a speed of 0.8c as measured by an observer on the Earth. The speed of the satellite measured by an observer in the spaceship is
a. 8.7c. b. 0.21c. c. ?0.21c. d. 0.93c. e. ?0.93c.
The formula for the hydronium ion is ______________
A. H? B. H?O? C. H?O? D. H?O?
The ______________ on the Moon are believed to have been caused by moonquakes
Fill in the blank(s) with correct word
The inhabitants of a planet in another galaxy have their eyes at the exact center of their 4.0-m long bodies. How long must a plane mirror be for such a creature to be able to see all of its body in the mirror?
a. 1.0 m b. 2.0 m c. 2.5 m d. 4.0 m e. 8.0 m