How much does it cost to operate a 25-W soldering iron for 8.0 hours if energy costs 8.0¢/kWh?
A) 25¢ B) $1.50 C) 16¢ D) 1.6¢
D
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Gravitational Force: As a 70-kg person stands at the seashore gazing at the tides (which are caused by the Moon), how large is the gravitational force on that person due to the Moon? The mass of the Moon is 7.35 × 1022 kg, the distance to the Moon is 3.82 × 108 m, and G = 6.67 × 10-11 N ? m2/kg2.
A. 0.24 N B. 0.024 N C. 0.0024 N D. 0.00024 N
Circular Motion of Charges: A proton having a speed of 3.0 × 106 m/s in a direction perpendicular to a uniform magnetic field moves in a circle of radius 0.20 m within the field. What is the magnitude of the magnetic field? (e = 1.60 × 10-19 C, mproton = 1.67 × 10-27 kg)
A. 0.080 T B. 0.16 T C. 0.24 T D. 0.32 T E. 0.36 T
For what reason was Pluto demoted from full planetary status in 2006?
A) because of objects as large or larger than Pluto in the Kuiper belt B) because Pluto resides outside of the zone that can truly be described as the solar system C) because Pluto was discovered to be a twin planet system D) because according to the standard definition, no planet can be smaller than the Earth's moon
Summarize the links in the distance chain that allow us to estimate distances to the farthest reaches of the universe
What will be an ideal response?