1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Andrew [12]
3 years ago
12

You have a tungsten sphere (emissivity ε = 0.35) of radius 25 cm at a temperature of 25°C. If the sphere is enclosed in a room w

hose walls are kept at -5°C, what is the net flow rate of energy out of the sphere?
Physics
1 answer:
egoroff_w [7]3 years ago
8 0

Answer:

Explanation:

Stefan's formula for emission of radiation is

E = e σ A  ( T⁴ - T₀⁴ )

E is energy radiated , e is emissivity , σ is stefan's constant , T is temperature of object and T₀ is temperature of surrounding. A is area of surface .

E = .35 x 5.67 x 10⁻⁸ ( 298⁴ - 268⁴ ) x 4π x .25²

= 1.9845 x 10⁻⁸ ( 78.86 - 51.58 ) x 10⁸ x .0625

= 3.38  J /s

You might be interested in
please help. Sound travels at 330 m/s. If a lightning bolt strikes the ground 5 m away from you, how long will it take for the s
Olenka [21]

Answer:

0.015 seconds

Explanation:

5/330=0.015

3 0
3 years ago
If a projectile fired beneath the water, straight up, breaks through the surface at a speed of 13m/s, to what height above the w
OlgaM077 [116]
Well if you had either the velocity or distance traveled i could tell you. But since you haven't all i can say for sure is that the water slowed the bullet down to 13m/s so lets say you knew the distance you would calculate how many meters it traveled and you would have your answer because in this situation, meters (height) =how many seconds spent going into the air. 
3 0
3 years ago
Andre heated several solid crystals of a substance called iodine, and the iodine changed directly to a gas. The iodine gas then
Strike441 [17]

The correct choice is

B. sublimation, then condensation

Sublimation is the name of the process where a solid directly converts into gas on heating. on heating solid crystals of iodine directly change into gas. hence this is sublimation.

condensation is the process where gas is converted into liquid on cooling.

here iodine gas is being converted into droplets on reducing the temperature. hence this is condensation.


8 0
3 years ago
Read 2 more answers
When atoms are split, they release energy. this concept applies to
balu736 [363]
This applies to nuclear reactions, specifically nuclear fission.

This huge release of energy has been used in atomic bombs and in the nuclear reactors that generate electricity.
6 0
3 years ago
A step-up transformer is connected to a generator that is delivering 141 V and 110 A. The ratio of the turns on the secondary to
hammer [34]

Answer:

31302 Volts and 55/111 Amps (≈0.5)

Explanation:

Secondary voltage / 141 = 1110 / 5

Secondary voltage = (1110*141) / 5

Secondary voltage = 31302

Amperage = 110/ (31302/141) = 55/111

5 0
3 years ago
Other questions:
  • which of the following small bodies are the hardest to tell apart because they are made of similar materials ? A . dwarf planets
    9·2 answers
  • You've decided to build a new gaming computer and are researching which power supply to buy. Which component in a high-end gamin
    12·1 answer
  • How can we determine the strength of a sonic boom?
    11·1 answer
  • Two cars are travelling side by side down a straight road in opposite directions.Both cars are travelling at a speed of 22m/s. W
    11·1 answer
  • If a marathon runner averages 9.51 mi/hr, how long does it take him to run a 26.220-mile marathon. Express your answers in hours
    8·1 answer
  • How do you find density of a liquid
    10·1 answer
  • Tidal power can be generated by man without investing a lot of energy into the process. True False
    12·2 answers
  • A 44,495 kg spacecraft is traveling through space with an initial speed of 1,290 m/s relative to Earth. A thruster fires for 27.
    15·1 answer
  • Cardiovascuar exercise involves
    12·1 answer
  • Read over slides 1-7 to see definitions and map examples of each physical feature.
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!