Determine the change in length of a 20-m railroad track made of steel if the temperature is changed from ?15°C to +35°C. (?STEEL = 1.1 × 10^?5/°C)
1.1 cm
Physics & Space Science
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What is 34 + ( 4 ) × (1.2465 ) written with the correct number of significant figures?
A) 39.0 B) 38.99 C) 4 × 101 D) 39 E) 38.986
Physics & Space Science
When a wave crosses from one medium into another in which the wave speed is lower, the frequency is unchanged. The wavelength
A. decreases. B. stays the same. C. increases.
Physics & Space Science
The kinetic energy of a bullet, per gram, is
A. about the same as the energy released from 1 gram of TNT B. about the same as the kinetic energy in a typical 1-gram meteor C. about the same as the energy released by 1 gram of chocolate chip cookies D. none of the above
Physics & Space Science
Cosmic rays originate in the
A) Earth's interior. B) Earth's upper atmosphere. C) Sun. D) cosmos. E) none of the above
Physics & Space Science