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
mote1985 [20]
2 years ago
7

The surface temperature of our sun is about 5800 K, and the peak of its intensity curve is in the middle of the visible spectrum

. Mammals have a body temperature of about 310 K. A star that appears reddish could have a surface temperature of:
Physics
1 answer:
amm18122 years ago
3 0

Explanation:

i expected to use Stefan's law of heat exchange but the value you gave aren't conclusive.

I should say that the temperature of the star should be close to that of the sun because of the similarity in the intensity curves

You might be interested in
Which property of gases best explains the ability of air bags to cushion the force of impact during a car accident?
Cerrena [4.2K]
Gasses because they are comperssible (plato)
7 0
3 years ago
Review please help.
iragen [17]

Answer:

1 and 3

Explanation:

because they are going up from 0

7 0
3 years ago
A 20-kg block slides down a fixed rough curved track The block has a speed of 5 0 m/s after its height above a horizontal surfac
Crank

Answer:

U = 102.8 J (100 J to two significant digits)

Explanation:

potential energy converted = 20(9.8)(1.8) = 352.8 J

kinetic energy at base of track = ½(20)5.0² = 250 J

energy (work) of friction 352.8 - 250 = 102.8 J

8 0
3 years ago
A fireman is sliding down a fire pole. As he speeds up, he tightens his grip on the pole, thus increasing the vertical frictiona
Andrei [34K]

Answer:

The fireman will continue to descend, but with a constant speed.

Explanation:

In kinetic friction <em>(which is the case discussed here) </em>since the fireman is already in motion because of a certain force, once the frictional force matches the normal force, the fireman will stop accelerating and continue moving at a constant rate with the original speed he had. We will need a force greater than the normal force acting on the fireman to cause a deceleration.

We need to understand the difference between static friction and kinetic friction.

Static friction occurs in objects that are stationary, while kinetic friction occurs in objects that are already in motion.  

In static friction, when the frictional force matches the weight or normal force of the object, the object remains stationary.

While in kinetic friction, when the frictional force matches the normal force, the object will stop accelerating. This is the case of the fireman sliding down the pole as discussed above.

8 0
3 years ago
The first law of thermodynamics states that energy can neither be created nor destroyed. If this is true then why are we always
riadik2000 [5.3K]

Answer:

The second law of thermodynamics states in an isolated system, the entropy (the amount of thermal energy that cannot be converted into mechanical work, also known as the amount of disorder) always increases, therefore, an isolated system always require an external input (new sources) of energy for there to be orderliness or for the available energy of the system to remain constant or increase

Explanation:

5 0
3 years ago
Other questions:
  • A player kicks a soccer ball from ground level and sends it flying at an angle of 30 degrees at a speed of 26 m/s. What is the v
    15·1 answer
  • A man runs 650 m east and then turns and runs 850 m west. This takes him 240 seconds.
    9·1 answer
  • If one gram of matter could be completely converted into energy, the yield would be
    7·1 answer
  • A 2.43ug particle moves at 1.97 x 108 m/s. What is its momentum?
    5·1 answer
  • The deflection plates in an oscilloscope are 10 cm by 2 cm with a gap distance of 1 mm. A 100 volt potential difference is sudde
    13·1 answer
  • Newton first law of motion​
    13·2 answers
  • What is the difference between muscular strength and muscular endurance
    8·2 answers
  • A metal bar magnet produces a magnetic field in space surrounding it. The point
    5·1 answer
  • .Why does the tension in each chain of a
    14·1 answer
  • In Bolt’s fastest 100 meter, he accelerated from the starting block to a speed of 27.8 mi/hr in 9.58 s. What was his acceleratio
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!