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4 years ago

Which variable stars have pulsation periods between 1.5 hours in 1.2 days

Physics

1 answer:

Tom [10]4 years ago

4 0

The stars that have pulsation periods between 1.5 hours and 1.2 days are RR Lyrae variables.

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What is the formula for convection?

Tju [1.3M]

Convection is transfer of heat between a solid and a moving fluid. Boiling or condensing processes are example for convection processes.

The formula for convection is:

q = hc A dT

where

hc is convective heat transfer coefficient of the process (W/(m2K) or W/(m2oC q
A is the heat transfer area of the surface (m2, ft2)
hc = convective heat transfer coefficient of the process (W/(m2K) or W/(m2oC), Btu/(ft2 h oF))q is heat transferred per unit time (W, Btu/hr)dT is the temperature difference between the surface and the bulk fluid (K or oC, F)

8 0

3 years ago

A stiff wire 50.0 cm long is bent at a right angle in the middle. One section lies along the z axis and the other is along the l

zloy xaker [14]

Answer:

Magnitude of the force is 2.135N and the direction is 41.8° below negative y-axis

Explanation:

The stiff wire 50.0cm long bent at a right angle in the middle

One section lies along the z axis and the other is along the line y=2x in the xy plane

$\frac{y}{x} = 2$

tan θ = 2

Therefore,

slope m = tan θ = y / x

$\theta=\tan^-^1(2)=63.4^0$

Then length of each section is 25.0cm

so, length vector of the wire is

$\hat I= (-25.0)\hat k +(25.0) \cos 63.4^0 \hati +(25.0) \sin63.4^0 \hatJ\\\\\hat I = (11.2) \hat i + (22.4) \hat j - (23.0) \hat k$

And magnetic field is B = (0.318T)i

Therefore,

$\bar F = \hat I (\bar l \times \bar B)$

$\bar F = (20.0)[(0.112m)i +(0.224m)j-(0.250m)k \times 90.318T)i]$

$= (20.0)(i(0)+j(-0.250)(0.318T)+k[0-(0.224m)(0.318T)]\\\\=(20.0)(-0.250)(0.318)j-(20.0)(0.224)(0.318T)\\\\=-(1.59N)j-(1.425N)k$

Magnitude of the force is

$F = \sqrt{(-1.59N)^2+(-1.425N)^2\\} \\F = 2.135N$

Direction is

$\alpha = \tan^-^1(\frac{-1.425N}{-1.59N} )\\\\= 41.8^0$

Magnitude of the force is 2.135N and the direction is 41.8° below negative y-axis

5 0

3 years ago

Read 2 more answers

The period of a pendulum is the time it takes for the pendulum to make one full back-and-forth swing. The period of a pendulum

mixer [17]

Answer: 0.04 s

Explanation:

The given equation for the period $T$ of a pendulum when the acceleration due gravity is given in feet per squared second $g=32 ft/s^{2}$ is:

$T=2 \pi \sqrt{\frac{l}{32 ft/s^{2}}}$

Where $l=\frac{1}{18} ft$ is the length of the pendulum

$T=2 \pi \sqrt{\frac{\frac{1}{18} ft}{32 ft/s^{2}}}$

$T=0.04 s$

3 0

4 years ago

At what distance of separation, or, must two 5.87*10^-8 coulomb charges be positioned in order for the repulsive force between t

kupik [55]

Explanation:

r^2= 9×10^9 × 5.87×5.87×10^-16 / 64.9

=47.7× 10^-8

so taking sq. root

r = 6.9 ×10^-4 m

r= 6.9×10^ -2 cm

this gives the required seperation

3 0

3 years ago

39.Explain the working mechanism of a mercury barometer.

alina1380 [7]

One end is sealed to prevent air from disturbing the scale and measures. Therefore, a Mercury Barometer works on the principle of balancing the atmospheric pressure with the volume of mercury present in the device

7 0

3 years ago