A train deports from a station at a constant acceleration of 5 m/s what is the speed of the train at the end of 20 seconds ?

Answers

Answer 1

Answer: You multiply the length of time by the speed, to get 100m/s

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What is the mass of a child if the force of gravity on the child's body is 100 N?
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The average distance from the sun to Pluto is approximately 6.10 time 10^9 km. How long does it take light from the sun (384,000 km/s) to reach Pluto?

An object starts at position 12 on a horizontal line with a reference point of 0. What is the position of the object if it moves 14 units to the left?

Answers

Answer:

The position of the object is $-2$

Explanation:

I add a picture of the situation in order to explain the question.

We are going to state the ''zero'' on a horizontal line. Then, we are going to state as positive the sense from left to right.

Now, if the object moves 14 units to the left , we need to subtract to the original position 14 units (because it will be a negative move given that the object is moving to the left) ⇒

$12-14=-2$

It new position will be at $-2$ .

In general, the first step to solve this kind of exercises is to set a reference system. Then, it is very important to draw the situation.

-2 is the right answer

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.

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A 15-kg bicycle carrying a 50-kg boy is traveling at a speed of 5 m/s. What is the KE of the bicycle and the boy?

Answers

Together as one moving package, their mass is (15 + 50) = 65 kg.

   Kinetic energy = (1/2) (mass) (speed)²

   = (1/2) (65 kg) (5 m/s)²

   = (32.5 kg) (25 m²/s²)

   =    812.5 kg-m²/s² = 812.5 joules .

An element can be identified by its spectrum. True False

Answers

True. Even though some elements have very similar spectrums that are not easy to tell apart so need to be examined carefully.

Answer: True on odyssey

Explanation:

Increasing the pitch of a note on the piano means you make the note

Answers

Increasing the pitch makes a note higher

Answer:

Increasing the pitch of a note on the piano means you make the note higher

Sound waves in air are a series ofa. periodic disturbances.
b. periodic condensations and rarefactions.
c. high- and low-pressure regions.
d. all of the above E. none of the above

Answers

Sound waves in air are a series of periodic disturbances, periodic condensations and rarefactions, and high- and low-pressure regions. It is all of the above. The answer is letter D.

Final answer:

Sound waves in air are a series of periodic condensations and rarefactions.

Explanation:

Sound waves in air are a series of periodic condensations and rarefactions. When a sound is produced, it creates compression regions (areas of high pressure) and rarefaction regions (areas of low pressure) that propagate through the air. These alternating regions of high and low pressure create the characteristic waveform of the sound wave.

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In a sound wave, the magnitude of the compression is ___ the magnitude of the rarefaction. greater than less than equal to