A rectangular steel plate with dimensions of 40.0 cm × 30.0 cm is heated from 14.0°C to 164.0°C. What is its change in area? (Coefficient of linear expansion for steel is 11 × 10^?6/C°.)
a. 8.96 cm2
b. 29.7 cm2
c. 3.96 cm2
d. 1.32 cm2
e. 9.90 cm2
c
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How would the inward migration of a Jovian-like planet in an extrasolar planetary system alter the probability of Life appearing?
A) it would improve chances since it would protect inner, Terrestrial-like planets from impacts B) it would improve chances slightly since some of the Terrestrial planets may become moons of the Jovian planet C) it would greatly decrease the chance since the orbits of the inner, Terrestrial-like planets would be disrupted D) it would make no difference at all
A 1.0-C point charge is 15 m from a second point charge, and the electric force on one of them due to the other is 1.0 N
What is the magnitude of the second charge? (k = 1/4??0 = 8.99 × 109 N ? m2/C2) A) 10 nC B) 0.025 C C) 25 C D) 1.0 C E) 25 nC
In a particle accelerator, a proton reaches an acceleration of 9.0 × 1013 m/s2. The mass of a proton is 1.7 × 10-27 kg. What is the force on the proton?
What will be an ideal response?
A heat engine ________
a. converts work into heat energy b. needs a temperature difference to be able to work c. can be 100% efficient in the absence of friction d. needs electricity to be able to run