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

Physics & Space Science

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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.

Physics & Space Science

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

Physics & Space Science

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

Physics & Space Science

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

Physics & Space Science