Ask question

Ask question

All categories

3 years ago

7

A man is walking while riding a train. He says he is moving at 2 mph. A woman standing on a platform at a train station says the

man on the train is moving at 72 mph. Which person is correct?

1 answer:

-BARSIC- [3]3 years ago

5 0

The woman is correct because it is the pace he is moving not walking.

You might be interested in

Looking at the bottom standing wave in the picture, how many complete waves are present?

Shtirlitz [24]

Answer:

the last one

Explanation:

4 0

2 years ago

A new roller coaster contains a loop-the-loop in which the car and rider are completely upside down. If the radius of the loop i

levacccp [35]

Answer:

The minimum speed must the car must be 13.13 m/s.

Explanation:

The radius of the loop is 17.6 m. We need to find the minimum speed must the car traverse the loop so that the rider does not fall out while upside down at the top.

We know that, mg be the weight of car and rider, which is equal to the centripetal force.

$mg = \dfrac{mv^2}{r}\\v = \sqrt{rg}\\v = \sqrt{17.6\times 9.8}\\v = 13.13\ m/s\\$

So, the minimum speed must the car must be 13.13 m/s.

5 0

2 years ago

What is the right way to sleep

nignag [31]

Answer:

by lying down on a nice and soft quilted matress

5 0

2 years ago

Read 2 more answers

A scientific law is ____________________A. A rule enacted by the National Academy of Sciences. B. What scientists expect will al

lapo4ka [179]

Your question asks what a scientific law is.

Your answer would be B). What scientists expect will always happen under particular circumstances

A scientific law is something that will always happen, it is mostly like a repeat when doing a experiment with certain factors in place. This is also known as a "natural law" because something will naturally happen when it is enacted with the same factors for multiple "trials". This "scientific law" will allow scientist to predict what would happen during other multiple trials that are conducted. Concise data would be received from these trials.

An example of a scientific law is Newton's law of gravitation.

Therefore, your answer would be B.

5 0

2 years ago

The displacement (in centimeters) of a particle moving back and forth along a straight line is given by the equation of motion s

Veseljchak [2.6K]

Answer:

$v_{avg} = 0$

Explanation:

The object is moving to and fro about its mean position

and the equation for its displacement is given as

$s = 5 sin(\pi t) + 5 cos(\pi t)$

now in one complete time period we know that the the object will complete its one oscillation

So the change in the position of the object in one complete time period will be ZERO

so here we can say that

$v_{avg} = \frac{displacement}{time}$

since change in position is zero

so displacement = 0

$v_{avg} = 0$

4 0

3 years ago