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3 years ago

Which of the following does not affect the apparent brightness of a star.

Physics

2 answers:

Tamiku [17]3 years ago

4 0

I would say that it is a how old the star is

Zigmanuir [339]3 years ago

3 0

A) how old it is :)))

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I don't know what to do so first people to answer get 30 points

garik1379 [7]

Answer: Hi!

Explanation:

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4 years ago

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A car having a total mass of 2250 kg and traveling at 72.0 km/h smashes into a tree. The car is stopped in 0.250 s. The average

musickatia [10]

Answer:

A. 1.8x10⁵

Explanation:

For this question we have

72km/h = speed

Total mass = 2250kg

Stopped at t = 0.2250s

To get average force acting on this car on collision:

72km/3.6 = 20m|s

Impulse = ∆p

This implies:

F∆t = m∆v

F = m∆v/∆t

= 2250x20/0.250

= 180000

= 1.8x10⁵

Therefore option A is correct.

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3 years ago

An object has kinetic energy of 324 J. If it’s speed is 9m/s, what is it’s mass?

harkovskaia [24]

It is 8 kilograms

I had to type more so here you go

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3 years ago

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ball dropped from top of 50m high cliff stone thrown straight up from bottom with speed of 24. they collide. how far above base

Tresset [83]

Answer:

28.73 m from the base of the cliff collide happen

Explanation:

Equation for ball dropped from 50 cliff is reaches distance x in t seconds isi given by

$x=ut+\frac{1}{2} at^2\\\\x= 0 \times t+\frac{1}{2} gt^2 =\frac{1}{2} gt^2......(1)$

stone is thrown up from the bottom with speed u=24 m/s . it reaches distance y when stone collide with ball.(g is negative here)

$y=24t-\frac{1}{2} gt^2.............(2)$

we know that total distance traveled by ball and stone is 50 m

$x+y=50 m$

adding equation 1 and 2, we get time t

$x+y=\frac{1}{2} gt^2+24t-\frac{1}{2}gt^2\\50=24t\\t=2.083 s$

substitute this time in equation 2, we can get the required distance where they collide

$y=24t-\frac{1}{2} gt^2\\y=24\times 2.083-\frac{1}{2}\times 9.8\times 2.083^2\\y=28.73 m$

28.73 m from the base of the cliff collide happen

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3 years ago

Why would the loss of cell service be an issue during the time of a major emergency like a hurricane? Answer using complete sent

Zarrin [17]

Without cell service you can't communicate with others, and outside of a hurricane people can't call their families to see if they are okay because they don't have cell service.

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4 years ago