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
Mice21 [21]
3 years ago
6

A certain lightbulb has a tungsten filament with a resistance of 20.3 Ω when at 20.0°C and 135 Ω when hot. Assume the resistivit

y of tungsten varies linearly with temperature even over the large temperature range involved here. Find the temperature of the hot filament. °C
Physics
1 answer:
Paladinen [302]3 years ago
3 0

Answer:

1275.61° C

Explanation:

The resistance of a conductor varies as a function of temperature and it is given as follows

R= R_o[1+\alpha(T-T_0)]

R_0 is the resistance at temperature T_0, R is  the resistance at T and  α is the coefficient of temperature of resistance

α= 0.0045/°C

R_0 = 20.3Ω T_0 = 20°C   and R= 135Ω  

135= 20.3[1+0.0045(T-20)]

T= 1275.61° C

Therefore the temperature of the hot filament =  1275.61° C

You might be interested in
A 1000 kg elevator is rising and its speed is increasing with an acceleration of 3 m/s^2. What is the resulting tension in the v
Alchen [17]

Answer:

12800 N

Explanation:

7 0
2 years ago
Which of the following are density labels? <br> a. Kg/L <br> b. g/m <br> c. g/mL <br> d. cm/g
bearhunter [10]
Density is a value for mass, such as kg, divided by a value for volume, such as m3. Density is a physical property of a substance that represents the mass of that substance per unit volume. It is a property that can be used to describe a substance.<span> </span><span>It has standard units of kg/m^3 or g/mL. So, the best answer is option C.</span>

4 0
3 years ago
Read 2 more answers
A hiker climbs a mountain. Starting at the base of the mountain, he first moved up 520m at a 32.0 degree angle. What is the fina
balu736 [363]

Answer:

\displaystyle \vec{d}=

Explanation:

<u>Displacement Vector</u>

Suppose an object is located at a position  

\displaystyle P_1(x_1,y_1)

and then moves at another position at

\displaystyle P_2(x_2,y_2)

The displacement vector is directed from the first to the second position and can be found as

\displaystyle \vec{d}=

If the position is given as magnitude-angle data ( z , α), we can compute its rectangular components as

\displaystyle x=z\ cos\alpha

\displaystyle y=z\ sin\alpha

The question describes the situation where the initial point is the base of the mountain, where both components are zero

\displaystyle P_1(0,0)

The final point is given as a 520 m distance and a 32-degree angle, so  

\displaystyle x_2=520\ cos32^o= 440.99\ m

\displaystyle y_2=520\ sin32^o=275.6\ m

The displacement is

\displaystyle \vec{d}=

5 0
2 years ago
57.9 g of gold has a volume of 3 cm³ what is the density of gold in g/ centimeters cubed
Grace [21]
D=m÷v

so density would be 57.9 ÷ 3 = 19.3 g/cm³
7 0
3 years ago
Read 2 more answers
The wavelength of the visible line in the hydrogen spectrum that corresponds to m = 5 in the Balmer equation is: A. 656 nm. B. 4
BaLLatris [955]

Answer:

The wavelength of the visible line in the hydrogen spectrum is 434 nm.

Explanation:

It is given that, the wavelength of the visible line in the hydrogen spectrum that corresponds to n₂ = 5 in the Balmer equation.

For Balmer series, the wave number is given by :

\dfrac{1}{\lambda}=R(\dfrac{1}{n_1^2}-\dfrac{1}{n_2^2})

R is the Rydberg's constant

For Balmer series, n₁ = 2. So,

\dfrac{1}{\lambda}=1.097\times 10^7\times (\dfrac{1}{2^2}-\dfrac{1}{5^2})

\lambda=4.34\times 10^{-7}\ m

or

\lambda=434\ nm

So, the wavelength of the visible line in the hydrogen spectrum is 434 nm. Hence, this is the required solution.

6 0
2 years ago
Other questions:
  • One important relationship between chemical and mechanical weathering is ________. 1. mechanical weathering forms more brittle m
    14·1 answer
  • Newton’s heliocentric view of the universe meant that the sun was the center of the universe. True False
    12·2 answers
  • An element's atomic number is 58. How many protons would an atom of this element have?
    7·1 answer
  • What did scientists predict the big bang should have left?
    12·2 answers
  • when a circular plate of metal is heated in an oven, its radius increases at .03 cm/min, at what rate is the area increasing whe
    7·1 answer
  • A pendulum of mass 0.8 kg has 20 joules of potential energy at the top of its path. It’s kinetic energy at the bottom of its swi
    15·2 answers
  • Jenny and Betty are having a great time at Busch Gardens riding the Ubanga Banga bumper cars. Jenny, who is traveling southward
    7·2 answers
  • How are mountains and plateaus alike?
    14·2 answers
  • The air pressure inside a car tire is
    12·1 answer
  • I will make brainliest! PLS HELPPP!!
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!