A 1.7 kg model airplane is flying north at 12.5 m/s initially - and 25 seconds later is observed heading 30 degrees west of north at 25 m/s. What is the magnitude of the average net force on the airplane during this time interval?
A. 0.85 N
B. 0.63 N
C. 1.1 N
D. 1.5 N
C. 1.1 N
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By how much will a slab of concrete 18. m long contract when the temperature drops from 24.°C to -16.°C? (The coefficient of linear thermal expansion for concrete is 12 × 10-6 per degree C.)
A) 1.5 cm B) 0.86 cm C) 70. mm D) 15. cm E) 0.5 cm
If you had something the size of a sugar cube that was made of white dwarf matter, it would weigh ________
A) as much as a truck B) as much as an average person C) about 5 pounds D) as much as the entire Earth
A series RLC circuit has a 100-? resistor, a 0.100-?F capacitor, and a 2.00-mH inductor connected across a 120 V rms ac source operating at resonant frequency. What is the rms value of the voltage across the inductor?
A) 170 V B) 150 V C) 120 V D) 54.0 V E) 533 V
Electromagnetic waves can travel in
A) a vacuum. B) water. C) both of these D) none of the above