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padilas [110]
2 years ago
14

A fire is burning in a fireplace. Where is the radiation?

Physics
1 answer:
mrs_skeptik [129]2 years ago
5 0
I think it’s A.
........
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Which<br> factors will increase the speed of a sound wave in the air?
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A higher temperature, stiffer materials, and less dense materials increase the speed of sound.
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The magnetic field around a magnet is called<br> Plss tell me fasssttt
Olenka [21]

Explanation:

The magnetic needle of a compass lines up with Earth's magnetic poles.

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2 years ago
A dragster starts from rest and travels 1/4 mi in 6.80 s with constant acceleration. What is its velocity when it crosses the fi
Ahat [919]
<h2>Its velocity when it crosses the finish line is 117.65 m/s</h2>

Explanation:

We have equation of motion s = ut + 0.5 at²

        Initial velocity, u = 0 m/s

        Acceleration, a = ?

        Time, t = 6.8 s    

        Displacement, s = 1/4 mi =    400 meters

     Substituting

                      s = ut + 0.5 at²

                      400 = 0 x 6.8 + 0.5 x a x 6.8²

                      a = 17.30 m/s²

Now we have equation of motion v = u + at

     Initial velocity, u = 0 m/s

     Final velocity, v = ?

     Time, t = 6.8 s

      Acceleration, a = 17.30 m/s²

     Substituting

                      v = u + at  

                      v = 0 + 17.30 x 6.8

                      v = 117.65 m/s

Its velocity when it crosses the finish line is 117.65 m/s

6 0
3 years ago
An eastbound car travels a displacement of 80.0 Km in 45 minutes. What is the velocity
alexgriva [62]

Explanation:

d= 80km = 8000m

t = 45 min = 45/60 h

= 0.75 h

V= ?

we know that,

V = d /t

or,V= 80 km / 0.75 h

  1. or, V= 106.67 km/hr

or,V= 106.67×1000m / 3600 s

2. or, V= 29.63 m/s

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2 years ago
Question 2 of 5 Instructions:Select the correct answer. What do scientists use to determine the temperature of a star? thermomet
Lena [83]
Scientists use the color of a star to determine its temperature.
PreviousReset C:\format dir\..<span />
4 0
3 years ago
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