1. A rifle with a longer barrel can fire bullets with a larger velocity than a rifle with a shorter barrel.

Answers

Answer 1

Answer: i dont believe so because thw longer the barrel the longer the bullet is inthe rifle shortening the force from the friction with the barrel so a rifle with a shorter barrel would be betterto use than one with a lomger barrel even though the longer barreled rifle may be more presice

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Emotional abuse is less harmful than physical abuse.
a. True
b. False

Answers

B) False
There is emerging evidence that emotional abuse is in fact, more harmful, than physical abuse. A study conducted by the Trauma Center at the Justice Resource Institute shows that because of the long-term nature of emotional and psychological abuse, victims score higher on a measure of a variety of negative risk factors and behaviors.

False, just because it's not physical, doesn't mean it's any less harmful than emotional.

You take a trip to a star located 1,000 light-years away and return. you travel at an average speed of 0.99c. hint: the time dilation formula is: t′=t1−(vc)2−−−−−−−−√. about how many years will pass on earth while you are gone?

Answers

Answer: 70712.44 ly

Using the following time dilation formula:

$t = \frac {t_o} {\sqrt{1- \frac {v^2}{c^2}}}$

where $t_o$ is the time measured in the moving frame, $v$ is the speed of the moving frame, $c$ is the speed of light and $t$ is time measured in other frame.

Inserting the values:

$t = \frac {1000 ly} {\sqrt{1- \frac {(0.99c)^2}{c^2}}}\n \Rightarrow t=\frac {1000 ly} {√(1-(0.99)^2)} \n \Rightarrow t=(1000ly)/(0.0141)=70712.44 ly$

Therefore, when a trip to a star 1000 ly years away is made with speed 0.99 c, 70712.44 ly would have passed on Earth.

Final answer:

Approximately 999 years will pass on Earth while you are gone.

Explanation:

The formula for time dilation is t′ = t1 - (vc)2 / c.
To calculate how many years will pass on Earth while you are on this trip, we need to determine the time experienced by the astronaut and then use the time dilation formula.
According to the information provided, the astronaut travels at an average speed of 0.99c, so v = 0.99c. The star is located 1,000 light-years away, so t1 = 1,000 years.
Plugging these values into the time dilation formula, we get:

t′ = 1,000 years - (0.99c)2 / c = 1,000 years - 0.9801 years = 999.0199 years.

Therefore, approximately 999 years will pass on Earth while you are gone.

Learn more about Time dilation here:

brainly.com/question/1933572

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A 2.75 kg sample of a substance occupies a volume of 250 cm³ . Find the density in g/cm³ and kg/m³