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ss7ja [257]
3 years ago
14

Why do hot stars look bluer than cool stars?

Physics
1 answer:
brilliants [131]3 years ago
5 0

Answer:

(B) The wavelength that a star radiates the most energy is inversely proportional to the temperature.

Explanation:

As we know that

According to Wien's law wavelength is inverse proportional to the temperature .

  λ.T = Constant.

λ.∝ 1 /T

As we know that star radiates wavelength and this wavelength is inverse proportional to the temperature of the star.

The temperature of cool star is cooler than the temperature of hot star that is cool star looks red and hot star looks blue.Cool star have low energy and hot star have high energy.

So option B is correct.

(B) The wavelength that a star radiates the most energy is inversely proportional to the temperature.

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Find the distance traveled in one back-and-forth swing by the weight of a 12 in. Pendulum that swings through a 75 degree angle.
tia_tia [17]

The distance traveled by pendulum, in one back-and-forth swing is 75.75 inches.

The period of pendulum can be calculated by

T = 2\pi \sqrt {\dfrac Lg}

Where,

T - period

L - length = 12 inches

g- gravitational acceleration  = \bold {9.8\rm \ m/s^2}

Put the values,

T = 2\pi \sqrt {\dfrac {12}{9.8}}\\\\T = 2 \times 3.14 \times \sqrt {0.122}\\\\T = 2.191

Now, the angular displacement of the pendulum can be calculated by,

\theta = A\times\rm \  cos(\omega T)

Where,

A- amplitude

\theta - angle  = 75^o

\omega - angular displacement = 2\pi/T = 2.866 m

Put the values and calculate for \omega,

75 = A\times{\rm \  cos}(2.866\times 2.191)\\\\75 =A \times cos\ 6.26\\\\A =\dfrac {75}{0.99}\\\\A = 75.75 \rm \ inches

Therefore, the distance traveled by pendulum, in one back-and-forth swing is 75.75 inches.

To know more about Amplitude of pendulum,

brainly.com/question/14840171

4 0
3 years ago
3. You drop an egg out of your 10 m 2nd story window. If it took 1.43 sec, calculate the
zhannawk [14.2K]

Answer:

15 is the answer

Explanation:

i multiplied 1.5 by 10 to get 15

8 0
3 years ago
A mechanic jacks up the front of a car to an angle of 8.0° with the horizontal in order to change the front tires. the car is 3.
Zina [86]
<span>First draw a free-body diagram. Torque T = Force F x Distance d where force is the component of gravitational force g and d is the lever arm distance to the pivot point. Since the pivot point is at the back tire we subtract that from the length of the car resulting in d = 1.12 - 0.40 = 0.72 meters = d. We are interested in the perpendicular component of the force exerted on the car jack so use sin 8 degrees then T=1130 kg x 9.81 m/s^2 x sin(8 degrees) x0.72 m = 1,110.80 Newton-meters</span>
5 0
4 years ago
Which of the following is the name for matter made up of only one type of atom?
kolbaska11 [484]

Answer:  <u>Element </u>

Explanation:

A chemical element is a substance which contain only one type of atom and it may be in the form solid, liquid and gas. On more the smallest particle of element is the atom.

5 0
3 years ago
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Give reason standard physical quantity is used for correct measurement of the given body​
PtichkaEL [24]

Answer:

Physical quantities are the substances which can be measured. By measuring physical quantities, we can measure the mass, weight and other physical properties

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