Only two forces act on a 3.0-kg mass. One of the forces is 9.0 N east, and the other is 8.0 N in the direction of 62° north of west. What is the magnitude of the acceleration of the mass?
a. 2.0 m/s2
b. 2.4 m/s2
c. 3.3 m/s2
d. 2.9 m/s2
e. 5.7 m/s2
d
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If a planet has 9 times the radius of the Earth, but has the same density as the Earth, what is the gravitational acceleration at the surface of the planet? (g = 9.8 m/s2)
a. 29.4 m/s2 c. 265 m/s2 b. 88.2 m/s2 d. 39.2 m/s2
At what frequency should a 200-turn, flat coil of cross sectional area of 300 cm2 be rotated in a uniform 30-mT magnetic field to have a maximum value of the induced emf equal to 8.0 V?
A. 7.5 Hz B. 7.1 Hz C. 8.0 Hz D. 8.4 Hz E. 16 Hz
A real (non-Carnot) thermodynamic engine, operating between thermal energy reservoirs at temperatures of 450 K and 270 K, performs 3.3 kJ of net work, and rejects 8.2 kJ of energy in a single cycle
(a) What is the thermal efficiency of this thermodynamic engine? (b) What is the maximum efficiency it could possibly have?
What is the minimum speed needed by a ground-state hydrogen atom for its kinetic energy to be enough to ionize the atom in a collision? (1 eV = 1.60 × 10-19 J, mH ? mproton = 1.67 × 10-27 kg)
A) 66.5 km/s B) 51.0 km/s C) 21.7 km/s D) 113 km/s E) 44.2 km/s