The acceleration of a ball as it rolls down a ramp is 4 m/s2 . The ball is referred to 2 s after it starts to roll. The distance from the starting point is __________
Fill in the blank(s) with correct word
8 m
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Suppose you live at latitude 30°N. Based on the given right ascensions and declinations, which of the following stars is never visible in 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'
In present day technology, a substance can become a superconductor
A. only at absolute zero temperature. B. at room temperature. C. at a temperature above the boiling point of water. D. at temperatures above 0 Kelvin but less than 100 Kelvin.
If the measured momentum of an electron is 3.20 × 10^-27 kg×m/s with an uncertainty of 4.8 × 10^-28 kg×m/s, what is the minimum uncertainty in the position? (h = 6.63 × 10^-34 J×s)
a. 0.63 × 10^-4 m c. 3.3 × 10^-6 m b. 2.2 × 10^-7 m d. 1.1 × 10^-7 m
A series LR circuit consists of a battery, resistor, inductor and a switch. When the switch is closed the circuit has a time constant of 8.0 s. If the resistance and inductance of the circuit are both doubled, what is the resulting time constant?
A. 8.0 s
B. 16 s
C. 32 s
D. 4.0 s
E. 2.0 s