About how many potentially hazardous asteroids pass within 0.05 AU of the Earth per decade in modern times?
A) None
B) 10-20
C) 200-300
D) 5000-1000
E) A completely unknown quantity; it could easily be anywhere from just a few to millions.
C
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What process do scientists use to determine how nature works?
a. The observational method b. The scientific method c. The brainstorming method d. The laboratory method e. The naturalistic method
How much water at 20 degrees Celsius is needed to melt 500 grams of ice at 0 degree Celsius?
a. 500 grams b. 1000 grams c. 1500 grams d. 2000 grams
If Jupiter were 10 times more massive, it would generate nuclear fusion in its core and be a star instead of a planet
Indicate whether the statement is true or false
Two identical particles, each with a mass of 4.5 mg and a charge of 30 nC, are moving directly toward each other with equal speeds of 4.0 m/s at an instant when the distance separating the two is equal to 25 cm. How far apart will they be when closest to one another?
a. 9.8 cm b. 12 cm c. 7.8 cm d. 15 cm e. 20 cm