The molecular building blocks of life have been found
A) only on the Earth
B) on the Earth, in interstellar clouds, and in meteorites
C) on the Earth and in meteorites
D) on the Earth and on Mars
B
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How fast must a hydrogen atom be traveling for its kinetic energy to be just enough to excite the ground-state atom to its first excited state in a collision? (1 eV = 1.60 × 10-19 J, mH ? mproton = 1.67 × 10-27 kg)
A) 44.2 km/s B) 21.7 km/s C) 66.5 km/s D) 113 km/s E) 51.0 km/s
To save on electricity and eliminate heat in the kitchen, you would like to build a solar cooker. Which type of mirror would work best?
A. convex B. concave C. planar
Velocity is similar to speed, but a ________ is also involved in velocity
a. acceleration b. direction c. position d. scalar
Which of the following correctly states the value and units of the acceleration of gravity on Earth?
A) 9.8 m/s2 B) 9.8 m/s C) 9.8 km/s2 D) 9.8 m2/s E) 9.8 km/s