Suppose you live at latitude 20°N. Based on the given right ascensions and declinations, which of the following stars passes closest to your zenith on its daily path through your sky?
A) Sirius: RA = 6hr 45m, dec = -16°42'
B) Canopus: RA = 6hr 24m, dec = -52°41'
C) Alpha Centauri: RA = 14hr 40m, dec = -60°50'
D) Arcturus: RA = 14hr 16m, dec = +19°11'
E) Vega: RA = 18hr 37m, dec = +38°47'
D) Arcturus: RA = 14hr 16m, dec = +19°11'
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Indicate whether the statement is true or false
A swimmer swims 20 laps in a north-south facing pool in 7.00 minutes. Her first lap is toward the north. Her displacement and average velocity are
A. 0; 0. B. 0; 2.38 m/s, south. C. 0; 2.38 m/s, north. D. 1 000 m, south; 2.38 m/s, south. E. 1 000 m, north; 2.38 m/s, north.
An air track cart with mass m and speed v moving along an air track collides with a stationary cart with a mass m/3. After the collision the first cart has a speed v/2. Is the collision elastic?
What will be an ideal response?
A proton moves around a circular path (radius = 2.0 mm) in a uniform 0.25-T magnetic field. What total distance does this proton travel during a 1.0-s time interval? (m = 1.67 × 10^-27 kg, q = 1.6 × 10^-19 C)
a. 82 km b. 59 km c. 71 km d. 48 km e. 7.5 km