An electron has a kinetic energy that is twice its rest energy. Determine its speed
a. 0.76 c
b. 0.81 c
c. 0.94 c
d. 0.54 c
e. 0.87 c
c
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If light takes 4 billion years to reach us from a distant galaxy, how much further away is the distant galaxy than the Andromeda galaxy which is 2 million light years away?
a) 4 billion times b) 200 times c) 20 times d) 2000 times e) 2 million times
An un-stretched hanging spring is 50 cm long. Suspending a 100-N block from it increases its length to 60 cm. Adding another 100-N block makes the spring's length
A) 60 cm. B) 70 cm. C) 80 cm. D) 100 cm. E) 120 cm.
Compared to the total energy available to support life on Earth, the total energy available to support life in a Europan ocean would be
A) about the same B) much larger C) slightly larger D) much smaller
What is the net power that a dog with surface area of 0.075 m2 radiates if his emissivity is 0.75, his skin temperature is 315 K, and he is in a room with a temperature of 290 K? The Stefan-Boltzmann constant is 5.67 × 10-8 W/(m2?K4)
A) 8.8 W B) 6.0 W C) 8.0 W D) 15 W E) 18 W