PHYSICS HIGH SCHOOL

Which of the following could be a potential safety hazard of indoor recreation?a. slippery rocks and loose gravel
b. flash floods
c. traveling without a compass, map, or GPS
d. a liquid spill on the floor that was not cleaned

Answers

Answer 1
Answer: d. a liquid spill on the floor that was not cleaned could be a potential safety hazard of indoor recreation

A liquid spill on the floor that was not cleaned could be a potential safety hazard of indoor recreation.

NOT:

a. slippery rocks and loose gravel
b. flash floods
c. traveling without a compass, map, or GPS
Answer 2
Answer:

Answer:

THE ANSWER IS D

Explanation:

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Gravity and Electromagnetic forceCompare and contrast these forces. Also provide two ways that they are alike and two ways that they are different.

Answers

Differences between gravitational and electromagnetic radiation

So far we have been emphasizing how, at a fundamental level, the generation and propagation of gravitational and electromagnetic radiation are basically quite similar. This is a major point in demystifying gravitational waves. But, on a more practical level, gravitational and electromagnetic waves are quite different: we see and use electromagnetic waves every day, while we have yet to make a confirmed direct detection of gravitational waves (which is why they seemed so mysterious in the first place).

There are two principal differences between gravity and electromagnetism, each with its own set of consequences for the nature and information content of its radiation, as described below.

Gravity is a weak force, but has only one sign of charge.
Electromagnetism is much stronger, but comes in two opposing signs of charge.
This is the most significant difference between gravity and electromagnetism, and is the main reason why we perceive these two phenomena so differently. It has several immediate consequences:Significant gravitational fields are generated by accumulating bulk concentrations of matter. Electromagnetic fields are generated by slight imbalances caused by small (often microscopic) separations of charge.Gravitational waves, similarly, are generated by the bulk motion of large masses, and will have wavelengths much longer than the objects themselves. Electromagnetic waves, meanwhile, are typically generated by small movements of charge pairs within objects, and have wavelengths much smaller than the objects themselves.Gravitational waves are weakly interacting, making them extraordinarily difficult to detect; at the same time, they can travel unhindered through intervening matter of any density or composition. Electromagnetic waves are strongly interacting with normal matter, making them easy to detect; but they are readily absorbed or scattered by intervening matter. 

Gravitational waves give holistic, sound-like information about the overall motions and vibrations of objects. Electromagnetic waves give images representing the aggregate properties of microscopic charges at the surfaces of objects.
Gravitational charge is equivalent to inertia.
Electromagnetic charge is unrelated to inertia. 
This is the more fundamental difference between electromagnetism and gravity, and influences many of the details of gravitational radiation, but in itself is not responsible for the dramatic differences in how we perceive these two types of radiation. Most of the consequences of the principle of equivalence in gravity have already be discussed, such as:The fundamental field of gravity is a gravitational force gradient (or tidal) field, and requires an apparatus spread out over some distance in order to detect it. The fundamental field in electromagnetism is an electric force field, which can be felt by individual charges within an apparatus.The dominant mode of gravitational radiation is quadrupolar: it has a quadratic dependence on the positions of the generating charges, and causes a relative "shearing" of the positions of receiving charges. The dominant mode of electromagnetic radiation is dipolar: it has a linear dependence on the positions of the generating charges, and creates a relative translation of the positions of receiving charges.

Answer:

1) Gravitational force and electromagnetic force both are field forces which means both forces exerted from long range of distance and we do not require any physical contact to apply these type of forces.

2) Now we also know that

F_g = (Gm_1m_2)/(r^2)

F_e = (kq_1q_2)/(r^2)

both the forces are inversely depends on the square of the distance between two charges or two masses

so both forces follow inverse square law.

Now two ways they are alike is

1) gravitational force never exist in form of repulsive force while electromagnetic force is either repulsive or attractive.

2) Gravitational force is independent of the medium between two masses while electromagnetic force is dependent on the medium between two charges

17. Explain some of the uses of the Global Positioning System. Why might emergency vehicles be equipped with GPS receivers?

Answers

GPS or Global Positioning System is a US-owned utility which provides the users with the navigation, positioning, and timing of a person's location. This is equipped in vehicles to receive the zone coordinates during the wars.

What is GPS?

The Global Positioning System or GPS is a U.S.-owned utility which provides the users with all the three services which are the positioning, navigation, and timing (PNT) services. The GPS system consists of all the three segments which are the space segment, the control segment, and the user segment.

The Navigation refers to getting from one location to another. Tracking is the monitoring of object or personal movements. Mapping is the creation of maps of the world. Timing includes bringing the precise timing to the world.

Vehicles which are equipped with the GPS receivers provide flight crew with a much more accurate landing zonecoordinates which are within 100 feet. This greatly lessens the helicopter's response time.

Learn more about GPS here:

brainly.com/question/28275639

#SPJ2

They can be used to map forests, help farmers harvest their fields, and navigate airplanes on the ground or in the air. They might be used in emergency vehicles to help the driver find the quickest route to the person in need and the quickest way back to the hospital.

Under what conditions can light be modeled like a ray? Like a wave?

Answers

when the aperture or object size is equivalent to the wavelength of light

Why is it important to define a frame of reference?a. An observer cannot be moving.
b. Motion must be defined relative to something.
c. It's impossible to measure motion.
d. A stationary observer is always moving.

Answers


Motion must be defined relative to something.

Here's an obvious, everyday example:

-- You're in a passenger jet, going to visit grandma on the
coast for the holidays.
-- You're sitting still in your seat, listening to some 'mp3's,
reading a book, and dozing off.
-- At the same time, people on the ground see you flying over
at almost 500 miles per hour.

Are you moving at 500 mph, or are you not moving at all ?

The answer is 'Yes. Both.'. It just depends on who's measuring your speed.

There's no such thing as your "real" speed.  Motion is always
relative to something.  Different reference = different speed.

It is important to define a frame of reference because motion must be defined relative to something. Hence option(b) is correct.

Further Explanation:

Frame of reference is a framework that is used for observation of physical phenomena. It consists of an observer, a coordinate system and positions with respect to the coordinate system.

(a)

Let us take an example of a trolley moving with velocity u and a man on the ground at rest.

Since, the man's velocity is zero, the relative velocity of trolley with respect to the man is u.

Now, if a man starts to run with speed u and speed of trolley increases to two times of initial velocity u i.e. 2u, the relative velocity of trolley with respect to man is (2u-u=u).

Here, in both the conditions, the relative velocity of trolley with respect to time is same.

Therefore, it is wrong to say that an observer cannot be moving. Hence, option(a) is incorrect.

(b)

Let us take an example of a man on the ground at rest and a trolley moving with the velocity u having an object placed in it. The object will also moves with the velocity u.

For a man, trolley is moving with velocity u but for an object trolley is at rest because there is no relative motion between object and trolley.

Therefore, it is right to say that motion must be defined relative to something. Hence, option(b) is correct.

(c)

Let us take an example of a first object moving with velocity u and a second object moving with velocity v in the opposite direction and a third object is at rest.

The relative velocity of first object with respect to second object is (v+u) and the relative velocity of first object with respect to third object is v.

Here, the relative velocity of an object is different with respect to different object but all the motions are measurable.

Therefore, it is wrong to say that it's impossible to measure motion. Hence, option(c) is incorrect.

(d)

Let us take an example of two trains moving with same velocity in same direction.

Consider a man sitting in one train observes a man running in other train, then the man sitting is said to be stationary observer for the man running. Here, the man is stationary observer while in motion.

Now, if a man standing on the ground at rest will see the man on train, he will be called stationary observer. Here, the man is stationary observer while not in motion.

Therefore, it is wrong to say that a stationary observer is always moving. Hence, option(d) is incorrect.

Learn more:

1. Motion on a rough surface: brainly.com/question/7031524

2. Motion under the gravitational force: brainly.com/question/10934170

3. Principle of conservation of momentum: brainly.com/question/9484203

Answer Details:

Grade: High School

Subject: Physics

Chapter: Kinematics

Keywords:

Frame, reference, important, observer, motion, relative, velocity, speed, moving, measure, stationary, example, trolley, man and train.

A sound wave has a wavelength of 0.450 meters. If its speed in cold air is 330 meters/second, what is the wave's frequency?

Answers

Most of the information's required are already given in the question. Based on those information's the answer can be easily deduced.
Wavelength of the sound wave = 0.450 meters
Speed of the sound wave = 330 meters per second
We already know
v=fλ
330 = f * 0.450
f = 330/0.450
  = 733.33 hertz
So the frequency of the wave is 733.33 hertz

Most of the information's required are already given in the question. Based on those information's the answer can be easily deduced.

Wavelength of the sound wave = 0.450 meters

Speed of the sound wave = 330 meters per second

We already know

v=fλ

330 = f * 0.450

f = 330/0.450

 = 733.33 hertz

So the frequency of the wave is 733.33 hertz

Why Newton's law of gravitation also called universal law?

Answers

Answer:

Explanation:

Newton's law of gravitation states that every particle of matter attracts any other particle in the universe with a force directly proportional to the product of there masses and inversely proportional to the square of the distance between them.

This law is also called universal law because it is applicable to all masses at all distances irrespective of the medium.
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