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2 years ago

Apparent brightness depends on which two properties?

Physics

2 answers:

Serjik [45]2 years ago

6 0

Answer:

I believe it is luminosity and distance

Explanation:

So B

hodyreva [135]2 years ago

4 0

Brightness-Luminosity Relationship:

At a particular Luminosity, the more distant an object is, the fainter its apparent brightness becomes as the square of the distance
So the correct ans is B

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What is the metric unit of force? kg kg/cm^3 kg/cm^2 N

Feliz [49]

Force is found by multiplying mass (kg) and acceleration (m/s^2), so the metric unit of force is kg*m/s^2 or N (newtons)

4 0

2 years ago

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1. Why is it important to use units in any graph?

Scorpion4ik [409]

Answer:

so its easier to understand for the reader

Explanation:

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2 years ago

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A rubber ball is dropped and bounces vertically from a horizontal concrete floor. If the ball has a speed of 3 m/s just before s

Ganezh [65]

Answer:

F=12.5N

Explanation:

Net force = rate of change of momentum

$F = m*a$

so find the change of momentum P

Pdown

$P=m*v_1=0.42kg*3m/s$

Pup

$P=m*v_1=0.42kg*6.5m/s$

dP = change in P

$dP= 0.42kg (3- -.6.5)m/s =3.99 kg m/s$

$dT = 0.32 s$

$F = \frac{dP}{dt}=\frac{3.99Kg*m/s}{0.32s} =12.468 N$

6 0

2 years ago

A student uses two magnets to pick iron screws out of a pile of scraps. Would more magnets attached to the top of the first two

Bond [772]

Answer:

any type of magnet or the number of magnet dosent matter its what matters is that iron is attracted to a magnet . Because iron is a metal and metals always attract magnet or any magenetic objects .

Explanation:

5 0

2 years ago

A sinusoidal electromagnetic wave is propagating in vacuum. At a given point P and at a particular time, the electric field is i

olasank [31]

Answer:

The direction of the wave propagation is the negative z -axis

The amplitude of electric and magnetic field are $A_E= 3.35*10^5 V/m$ ,

$A_M= 1.12 *10^{-3} T$ respectively

Explanation:

According to right hand rule, your finger (direction of electric field) would be pointing in the positive x-axis i.e towards your right let your palms be face toward the direction of the magnetic field i.e negative y-axis (toward the ground ) Then anywhere your thumb stretched out is facing is the direction of propagation of the wave here in this case is the negative z -axis

The Intensity of the wave is mathematically represented as

$I = \frac{1}{2} c \epsilon _O E_{rms}^2$