The cosmic microwave background gives us a view of the universe when it was
A) 380,000 years old. B) 14 billion years old.
C) about 1 million years old. D) 3-5 minutes old.
A
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A 30.0 cm wrench is used to generate a torque at a bolt. A force of 40 N is applied perpendicularly at the end of the wrench. The torque generated at the bolt is
A. 5.0 N•m. B. 7.0 N•m. C. 9.0 N•m. D. 12 N•m. E. 20 N•m.
The length and width of a rectangle are 1.125 m and 0.606 m, respectively. Multiplying, your calculator gives the product as 0.68175. Rounding properly to the correct number of significant figures, the area should be written as
A) 0.7 m2. B) 0.68 m2. C) 0.682 m2. D) 0.6818 m2. E) 0.68175 m2.
An hour of right ascension corresponds to 60 degrees in the sky
Indicate whether the statement is true or false
A steel bridge is 1000 m long at -20°C in winter. What is the change in length when the temperature rises to 40°C in summer? The average coefficient of linear expansion of this steel is 11 × 10-6 K-1
A) 0.33 m B) 0.44 m C) 0.55 m D) 0.66 m