PHYSICS HIGH SCHOOL

What do ultrasounds use?radio waves
ultraviolet waves
light waves
sound waves

Answers

Answer 1
Answer:

Ultrasounds are used in the medical profession for the purpose of diagnosis. Ultrasounds uses high frequency sound waves. Thus, the correct option is D.

What are Ultrasounds?

Ultrasound are the sound waves with frequencies which are higher than the upper audible limit of normal human hearing. Ultrasound is not different from normal audible sound frequencies in its physical properties, except that humans cannot hear these sound.

Ultrasound is used in diagnostics where it is also called as sonography or diagnostic medical sonography. It is an imaging method which uses sound waves to produce images of structures within the body of a person. The images produced can provide valuable information for the purpose of diagnosing and directing treatment for a variety of diseases and conditions.

Therefore, the correct option is D.

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Answer 2
Answer:

Answer:

D. sound waves

Explanation:

on edg

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The Great Barrier Reef is home to many types of different animals, including sea turtles, coral, sea snakes, great white sharks, shrimp, and giant clams. What do all of these animals have in common? A) They are all producers. B) They are all consumers. C) They are all herbivores. D) They are all top-level carnivores.

Lithification is the process that produces _______ rocks

Answers

Lithification is the process that produces sedimentary rocks which show the Earth's natural past by bringing together sediments into layers of solid rock.

Lithification forms sedimentary rocks. Earth's three main rock kinds are sedimentary, igneous, and metamorphic. Sediments, microscopic particles from pre-existing rocks, minerals, organic materials, or chemical precipitates, accumulate, transport, and deposit at or near the Earth's surface.

Lithification is a multistep process. Sediments are initially deposited in riverbeds, lakes, oceans, deserts, and glaciers. As new sediments are deposited on top, these loose particles are pressured by the weight of higher layers. This pressure compacts sediments, narrowing pore gaps between particles and sticking them together.

During lithification, minerals dissolved in groundwater can precipitate and cement the sediments. Calcite, silica, and iron oxides are sedimentary rocks' main cementing minerals. Sediments become solid rock by cementation.

As pressure rises, dewatering forces water out of sediment pore spaces during lithification. This helps sediment layers compact and solidify.

Lithification creates a cohesive and cemented sedimentary rock that records historical environmental conditions, climate changes, and life on Earth. Sandstone, limestone, conglomerate, shale, and mudstone are sedimentary rocks.

Lithification is essential to the production of sedimentary rocks, changing the Earth's surface and revealing its geological past.

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wanswer is ''sedimentary'' rocks

While skiing, Ellen encounters a ledge that sends her flying horizontally at a rate of 12 m/s. How far away will she land if the ledge is 7 meters high? ...?

Answers

In this problem, we must first calculate that Ellen will be on air. Using the equation of a free-falling body,

y = -g/2*t^2 + y0

When she hits the ground, y = 0. With y0 = 7 and g = 9.80,
0 = -4.90*t^2 + 7
t = 1.20 s

Thus, her horizontal displacement is then
x = vt
x = (12)(1.20)
x = 14.3 m

What happens to the temperature of a substance during a phase change?a. The temperature increases.
b. The temperature decreases.
c. The temperature remains constant.
d. The temperature fluctuates randomly.

Answers

during a phase change, the temperature remains constant. obviously all the heat is used in phase transformation.

Answer:

THE TEMPERATURE DECREASES

Explanation:

the clouds reflect the suns rays so the go away therefore making it less hot

What is the minimum speed with which he’d need to run off the edge of the cliff to make it safely to the far side of the river? the answer was 6 m/s the world-record time for the 100 m dash is approximately 10 s. given this, is it reasonable to expect brady to be able to run fast enough to achieve brady's leap? a.yes, the obtained speed is less than the world-record.
b.yes, the obtained speed is almost equal to the world-record.
c.no, the obtained speed is greater than the world-record.
d.no, the obtained speed is almost equal to the world-record.

Answers

The answer is

A. Yes, the obtained speed is less than the world record

The explanation:

when the obtained speed is 6 m /s

and the world record speed = distance / time = 100 m / 10 s = 10 m/s

So, Yes, the obtained speed is less than the world record

Not only is it less, its also a reasonable average speed for a somewhat athletic person. Therefore, the leap is entirely possible.

-Samuel Brady gained his lasting notoriety for his leap over the Cuyahoga River around 1780 in what is now Kent, Ohio. After following a band of Indians into the Ohio country, a failed ambush attempt resulted in the band chasing Brady near the Cuyahoga River. To avoid capture, Brady leaped across a 22-foot (6.7 m) wide gorge of the river (which was widened considerably in the 1830s for construction of the Pennsylvania and Ohio Canal) and fled to a nearby lake where he hid in the water under a fallen tree using a reed for air.

Part (a): The minimum speed of Brady should be \boxed{6\text{ m/s}} to cross the cliff.

Part (b): The speed of Brady’s leap is possible to achieve, as it is less than the speed of world record.

Further Explanation:

(a)

Brady jumps from a cliff to go on other side. He crosses 22\text{ ft} horizontal distance from a height of 20\text{ft}. To jump from cliff, he follows the Newton’s law of motion.

Given:

The horizontal distance is 22\text{ ft}.

The vertical distance is 20\text{ft}.

Concept:

The horizontal distance in meter is 6.71\text{ m}.

The vertical distance in meter is 6.10\text{ m}.

To obtain the time of flight, applying one of the equation of motion given as:

s=ut+(1)/(2)at^2

Substitute 0\text {m/s} for u and rearrange the above equation for t :

t=\sqrt{(2s)/(a) }

Substitute 6.10\text{ m} for s and 9.81\text{ m}/\text{s}^2 for a in above equation.

\begin{aligned}t&=\sqrt{(2*6.10)/(9.81)}\text{ s}\n&=1.12\text{ s}\end{aligned}

The time of flight and time taken to cover horizontal distance are equal.

Horizontal velocity of Brady given as:

\begin{aligned}v&=(6.71)/(1.12)\text{ m/s}\n&\approx6\text{ m/s}\end{aligned}

Thus, the minimum speed of Brady should be \boxed{6\text{ m/s}} to cross the cliff.

(b)  

The minimum speed with which Brady is running is 6\text{ m/s}.

The speed of world record given as:

\begin{aligned}V&=(100)/(10)\text{ m/s}\n&=10\text{ m/s}\end{aligned}  

Thus, the speed of Brady’s leap is possible to achieve, as it is less than the speed of world record.

Learn more:

1. Projectile motion of a body: brainly.com/question/11023695

2. Body in pure rolling motion: brainly.com/question/9575487

3. Newton’s law of motion: brainly.com/question/6125929

Answer Details:

Grade: High School

Subject: Physics

Chapter: Kinematics

Keywords:

1780, Brady's Leap, Captain, Sam, U.S. Continental Army, horizontally, cliff, Ohio's Cuyahoga, gorge, leap, 22 ft, 20 ft, minimum, speed, river, 100 m, dash, 10 s, jump, time of flight, vertical and distance.

a tungsten and coil has a resistance of 12 ohm at 15 degree celsius is the temperature coefficient of resistance of tungsten is 0.004 calculate the equal resistance at 80 degree Celsius​

Answers

Answer:

The resistance of the tungsten coil at 80 degrees Celsius is 15.12 ohm

Explanation:

The given parameters are;

The resistance of the tungsten coil at 15 degrees Celsius = 12 ohm

The temperature coefficient of resistance of tungsten = 0.004/°C

The resistance of the tungsten coil at 80 degrees Celsius is found using the following relation;

R₂ = R₁·[1 + α·(t₂ - t₁)]

Where;

R₁ = The resistance at the initial  temperature = 12 ohm

R₂ = The resistance of tungsten at the final temperature

t₁ = The initial temperature = 15 degrees Celsius

t₂ = The final temperature = 80 degrees Celsius

α = temperature coefficient of resistance of tungsten = 0.004/°C

Therefore, we have;

R₂ = 12×[1 + 0.004×(80 - 15)] = 15.12 ohm

The resistance of the tungsten coil at 80 degrees Celsius = 15.12 ohm.

Imagine that a car is traveling from your left to your right at a constant velocity. Which two actions could the driver take that may be represented as (a) a velocity vector and an acceleration vector both pointing to the right and then (b) changing so the velocity vector points to the right and the acceleration vector points to the left?

Answers

Answer:

(a). The speed of car will increases.

(b). The speed of car will decreases.

Explanation:

Given that,

A car is traveling from your left to your right at a constant velocity.

We need to find two actions could the driver take

Using given data

(a). If the velocity and acceleration of car to the right

It means the velocity and acceleration of car is in same direction then the speed of car will increases.

(b). If the velocity to the right and the acceleration to the left

It means the velocity and acceleration of car is in opposite direction then the speed of car will decreases.

Hence, (a). The speed of car will increases.

(b). The speed of car will decreases.
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