A sphere of surface area 1.25 m2 and emissivity 1.0 is at a temperature of 100°C. At what rate does it radiate heat into empty space? (? = 5.67 × 10-8 W/m2 ? K4)

A) 7.1 W
B) 0.71 mW
C) 1.4 kW
D) 9.9 mW
E) 3.7 W


C

Physics & Space Science

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Matter falling onto a compact object, such as a neutron star or black hole,forms a(n):

a. accretion disk b. binary star c. gamma-ray burst d. pulsar e. magnetar

Physics & Space Science

Matter Waves: Electrons are accelerated to a speed of 4.0 × 104 m/s and are then aimed at a double-slit apparatus, where interference fringes are detected. If the electrons were replaced by neutrons, what speed must neutrons have to produce interference fringes with the same fringe spacing as that observed with the electrons? (h = 6.626 × 10-34 J ? s, melectron = 9.11 × 10-31 kg, mneutron = 1.675 × 10-27 kg)

A. 2.2 × 101 m/s B. 7.3 × 107 m/s C. 1.7 × 106 m/s D. 9.3 × 102 m/s

Physics & Space Science

Each form element is called a(n) ______.

A. cell B. field C. tag D. label

Physics & Space Science

Suppose you have three identical lightbulbs, some wire, and a battery. You connect one lightbulb to the battery and take note of its brightness. You add a second lightbulb, connecting it in series with the previous lightbulbs, and again take note of the brightness. Repeat the process with the third lightbulb, connecting it in series with the other two. As the lightbulbs are added, the lifetime of

the battery (Neglect the battery’s internal resistance.) 1.increases. 2.decreases. 3.remains the same. 4.Need more information.

Physics & Space Science