During the past few million years, ice ages were MOST LIKELY caused by
A) changes in the distance from the Earth to the Sun
B) small changes in the Earth's axis tilt and orbit
C) changes in the heat released from the Earth
D) changes in the energy output of the Sun
B
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The number of significant figures in 3.24 cm is
A. 2. B. 3. C. 4. D. 5.
What is the "chicken-and-egg" type problem we face when trying to decide which came first–proteins or nucleic acids?
A) proteins and nucleic acids probably looked very different before the origin of life B) nucleic acids cannot replicate without proteins, and proteins cannot be made without nucleic acids C) early proteins and nucleic acids were very similar to each other D) proteins and nucleic acids are always present together at the same time
Rupel pushes a box 7.00 m by applying a 25.0-N horizontal force. What work does she do?
a. 3.57 J b. 0.280 J c. 175 J d. –175.0 J e. 25.0 J
Calculate the current through a 10.0-m long 22-gauge nichrome wire with a radius of 0.321 mm if it is connected across a 12.0-V battery. The resistivity of the nichrome is 1.00 × 10-6 ? ? m
A) 30.9 A B) 61.8 A C) 0.776 A D) 0.388 A