In which of these processes is an element transformed into a completely different element?
A) alpha decay
B) beta decay
C) both of these
D) none of the above
Answer: C
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The filament in a light bulb has a diameter of 0.050 mm and an emissivity of 1.0. The temperature of the filament is 3000°C
What should be the length of the filament so it will radiate 60 W of power? The Stefan-Boltzmann constant is 5.670 × 10-8 W/m2 • K4. A) 11 cm B) 9.4 cm C) 8.6 cm D) 7.2 cm E) 5.9 cm
Snell's Law: A thin laser beam traveling in air strikes the surface of a glass plate at 41.2° with the normal. In the plate, this beam makes an angle of 22.4° with the normal. What is the speed of light in this glass? (c = 3.0 × 108 m/s)
Fill in the blank(s) with the appropriate word(s).
The following quantities relate to the rate of change of position. Which pair will always have the same magnitude?
A. Average speed and average velocity B. Average velocity and instantaneous velocity C. Instantaneous speed and instantaneous velocity D. Average speed and instantaneous speed
A mass 
is connected by a light string that passes over a pulley of mass M to a mass 
sliding on a frictionless horizontal surface as shown in the figure. There is no slippage between the string and the pulley. The pulley has a radius of 25.0 cm and a moment of inertia of 1?2 
If m1 is 1.00 kg, 
is 2.00 kg, and M is 4.00 kg, then what is the tension in the string attached to 
?
A. 3.92 
B. 3.65
C. 3.23
D. 3.02
E. 2.98