An ideal solenoid with 3000 turns is 70.0 cm long. If its self-inductance is 25.0 mH, what is its radius? (?0 = 4? × 10-7 T ? m/A)
A) 0.0222 m B) 52.0 m C) 0.00199 m D) 327 m
A
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A star whose mass is 5 times larger than the Sun's and whose luminosity is 100 times larger than the Sun's has a main sequence lifetime about
A. 5 times longer than the Sun's. B. 5 times shorter than the Sun's. C. 20 times shorter than the Sun's. D. 100 times shorter than the Sun's. E. 500 times longer than the Sun's.
A very thin uniform rod, 2.40 m long and of weight 135 N, has a frictionless hinge at its lower end. It starts out vertically from rest and falls, pivoting about the hinge
Just as it has rotated through an angle of 55.0°, what is the downward acceleration of the end farthest from the hinge? A) 5.02 m/s2 B) 8.03 m/s2 C) 9.80 m/s2 D) 12.0 m/s2 E) 19.6 m/s2
An equal amount of 0°C air that is twice as hot has a temperature of
A) 0°C. B) 64°C. C) 100°C. D) 273°C. E) none of the above
A 40.0-g block of ice at -15.0°C is dropped into a calorimeter (of negligible heat capacity) containing water at 15.0°C. When equilibrium is reached, the final temperature is 8.0°C
How much water did the calorimeter contain initially? 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) 302 g B) 345 g C) 405 g D) 546 g E) 634 g