Most pulsars _____
a. speed up their rotation as they age
b. become more luminous as they age
c. emit lower energy radiation as they age
d. emit higher energy radiation as they age
e. slow downtheir rotation as they age
e
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A small bulb is rated at 7.50 W when operated at 125 V. The tungsten filament has a temperature coefficient of resistivity ? = 4.50 × 10^?3 / °C. When the filament is hot and glowing, its temperature is seven times room temperature (20 °C). What is the resistance of the filament (in ohms) at room temperature?
a. 234 b. 1 350 c. 2 080 d. 4 530 e. 5 630
The pitch of a sound is determined by the frequency; the higher the frequency, the higher the pitch
Indicate whether the statement is true or false
How do the escape speeds for two rockets, the first weighing 20 N and the second weighing 20,000 N compare?
A) The escape speed for the lighter rocket is smaller than that for the heavier rocket. B) The escape speed for the lighter rocket is the same as that for the heavier rocket. C) The escape speed for the lighter rocket is greater than that for the heavier rocket.
A race car goes around a curve at 50 m/s. The radius of the curve is 400 m. What is the car's acceleration?