An airplane travels 80 m/s as it makes a horizontal circular turn which has a 0.80-km radius. What is the magnitude of the resultant force on the 75-kg pilot of this airplane?
A. 0.69 kN
B. 0.63 kN
C. 0.66 kN
D. 0.60 kN
E. 0.57 kN
Answer: D
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A thin copper rod 1.00 m long has a mass of 50.0 g. What is the minimum current in the rod that would allow it to levitate above the ground in a magnetic field of magnitude 0.100 T?
1.1.20 A 2.2.40 A 3.4.90 A 4.9.80 A 5.none of those answers
How much heat must be removed from 456 g of water at 25.0°C to change it into ice at -10.0°C? The specific heat of ice is 2090 J/(kg?K) and the latent heat of fusion of water is 33.5 × 104 J/kg
A) 105 kJ B) 153 kJ C) 57.3 kJ D) 47.7 kJ E) 210 kJ
Giant and supergiant stars are rare because that stage of stellar evolution is short
Indicate whether the statement is true or false
A hydrogen atom is in its n = 2 excited state when its electron absorbs a photon of energy . What is the energy of the resulting free electron? The lowest level energy state of hydrogen is -13.6 eV. (h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A) 5.1 eV B) 6.6 eV C) 6.9 eV D) 7.7 eV