If a car travels 60 mi. north for one-half hour, 100 mi. west for one hour, and 60 mi. south for 30 minutes, what is the total displacement of the car?100

220

0

Is The direction N, S, E, W, or N/A

Answers

Answer 1

Answer:
The first and the last segment ... 60 mi north and 60 mi south ... canceled
each other. The only segment left is the 100 mi west, so that's the overall
displacement ... 100 miles west. The times don't matter at all.

Answer 2

Answer: I would say that the total displacement of the car would have to be in the Westward direction.

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Explain why the current is reduced as electrons move through a conductor.

Current can also be calleda. voltage.
b. electricity.
c. moving charges.
d.
b. and
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Answers

Electrical current is the flow of moving charges.

D. It is electricity and moving charges

Emilio's teacher told his class that a controlled experiment's results are valid only if one factor in the experiment is changed and all the other factors remain constant. Why is this statement true?Changing several different factors in an experiment takes too much time.

Changing several different factors in an experiment takes too many controls.

When only one factor is changed, you don't need to use a control.

When only one factor is changed, you can be more certain that it caused the results.

Answers

Actually, two of the statements can be argued to be true:
1)Changing several different factors in an experiment takes too many controls.

This means that for every factor that is changed you need a control which has all the other factors stable - but with many factors, this might be undoable.

2) - and this is the best answer:
When only one factor is changed, you can be more certain that it caused the results.

If this factor is the only thing that changes, you can safely assume that it caused the results!

A. When only one factor is changed, you can be more certain that it caused the results.

There are several ways to make sure the results of an investigation are valid. First, you and others can try to repeat the experiment. In addition, if it is a controlled experiment, you can make sure you have a control, only one independent variable, at least one dependent variable, and constants.

It is especially important to use only one independent variable because when only one factor is changed, you can be more certain that it caused the results. If you change multiple factors, you won't know which one was responsible for the change.

A solid sphere has a radius of 0.200 m and a mass of 150.0 kg. how much work is required to get the sphere rolling with an angular speed of 50.0 rad/s on a horizontal surface? assume that the sphere starts from rest and rolls without slipping.

Answers

Here in this case we can use work energy theorem

As per work energy theorem

Work done by all forces = Change in kinetic Energy of the object

Total kinetic energy of the solid sphere is ZERO initially as it is given at rest.

Final total kinetic energy is sum of rotational kinetic energy and translational kinetic energy

$KE = (1)/(2)Iw^2 +(1)/(2) mv^2$

also we know that

$I = (2)/(5)mR^2$

$w= (v)/(R)$

Now kinetic energy is given by

$KE = (1)/(2)((2)/(5)mR^2)w^2 +(1)/(2) m(Rw)^2$

$KE = (1)/(5)mR^2w^2 +(1)/(2) mR^2w^2$

$KE = (7)/(10)mR^2w^2$

$KE = (7)/(10)*150*(0.200)^2(50)^2$

$KE = 10500 J$

Now by work energy theorem

Work done = 10500 - 0 = 10500 J

So in the above case work done on sphere is 10500 J

What group does paracetamol come under

Answers

Paracetamol is grouped within the 'painkillers' category.

Explain why dissolving is a physical change

Answers

It's a physical change because it is changing from one matter to another.

because the kinetic energy start to decrease, for example if we put sugar in a high temperature tea and we shake it what will happen to the sugar will the kinetic energy increase or decrease, it will probably decrease, just like us the people when we enter a cold room and we have a hot temp.

Which satellite gave us our first photograph of Earth from space?

Answers

The correct answer is explorer 6

Final answer:

The first satellite to capture a photograph of Earth from space was Explorer 1, launched on January 31, 1958. This and subsequent space missions like the Apollo program expanded our visual understanding and perception of our planet.

Explanation:

The first satellite to give us a photograph of the Earth from space was Explorer 1, launched on January 31, 1958. Prior to Explorer 1, the Soviet Union had launched Sputnik 1 in October 1957, but Explorer 1 was the first satellite to provide us with images of Earth from space. This marked a significant moment in human history, altering our perception of the planet.

Later on, the Apollo program further improved our visual understanding of Earth, with the Apollo 17 mission capturing the 'Blue Marble' - one of the rare full disk images of the Earth in sunlight. Such images underscored our perception of Earth as a small, yet interconnected and strikingly beautiful, celestial body floating in the vastness of space.