An object is dropped from a bridge. A second object is thrown downwards 1.0 s later. They both reach the water 20 m below at the same instant. What was the initial speed of the second object? Neglect air resistance
A) 21 m/s B) 9.9 m/s C) 20 m/s D) 15 m/s E) 4.9 m/s
D
Physics & Space Science
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Explain differential rotation and Keplerian motion
What will be an ideal response?
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An 8000-kg aluminum flagpole 100-m long is heated by the Sun from a temperature of 10°C to 20°C. Find the heat transferred (in J) to the aluminum if the specific heat of aluminum is 0.215 cal/g?°C.
A. 7.2 × 105 B. 7.2 × 107 C. 7.2 × 103 D. 7.2 × 101 E. 7.2 × 102
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The Great ________ Spot of Neptune was striking in 1989, but gone by 1995
Fill in the blank(s) with correct word
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If ? = 9.0 V, what is the current in the 15-? resistor?
a.
0.20 A
b.
0.30 A
c.
0.10 A
d.
0.26 A
Physics & Space Science