Help me plz it physics

suppose that you look into a photometer's eyepiece and the fluorescent disks appear to be equal in intensity. If the distance be

Y_Kistochka [10]

75 candela

Hope this helps ;)

7 0

3 years ago

A(n) __________ refers to a substance or treatment that is often used in an experiment but does not have an actual medicinal or

kipiarov [429]

Answer:

A placebo refers to a substance or treatment that is often used in an experiment but does not have an actual medicinal or experimental benefit.

Explanation:

3 0

2 years ago

Read 2 more answers

Brian is repairing an old alarm clock. He needs to replace a device that converts the electric energy into sound energy. Which o

kkurt [141]

Heyo, the answer would be buzzer (B)
think of how the buzzer makes a sound due to the electric energy

3 0

2 years ago

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Asbestos, HPV, chemicals found in tobacco smoke, and exposure to radioactivity and UV radiation are causes of

Neko [114]

The BT chemicals in the polymers of the UV radiation and asbestos

8 0

3 years ago

A fatigue test was conducted in which the mean stress was 50 MPa (7250 psi) and the stress amplitude was 225 MPa (32,625 psi).

Tems11 [23]

Answer:

275 MPa, -175 MPa

-0.63636

450 MPa

Explanation:

$\sigma_{max}$ = Maximum stress

$\sigma_{min}$ = Minimum stress

$\sigma_m$ = Mean stress = 50 MPa

$\sigma_a$ = Stress amplitude = 225 MPa

Mean stress is given by

$\sigma_m=\frac{\sigma_{max}+\sigma_{min}}{2}\\\Rightarrow \sigma_{max}+\sigma_{min}=2\sigma_m\\\Rightarrow \sigma_{max}+\sigma_{min}=2\times 50\\\Rightarrow \sigma_{max}+\sigma_{min}=100\ MPa\\\Rightarrow \sigma_{max}=100-\sigma_{min}$

Stress amplitude is given by

$\sigma_a=\frac{\sigma_{max}-\sigma_{min}}{2}\\\Rightarrow \sigma_{max}-\sigma_{min}=2\sigma_a\\\Rightarrow \sigma_{max}-\sigma_{min}=2\times 225\\\Rightarrow \sigma_{max}-\sigma_{min}=450\ MPa\\\Rightarrow 100-\sigma_{min}-\sigma_{min}=450\\\Rightarrow -2\sigma_{min}=350\\\Rightarrow \sigma_{min}=-175\ MPa$