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No mechanical waves cannot travel in a vacuum

Answer:

What are Newton's laws of motion? Newton's laws of motion relate an object's motion to the forces acting on it. In the first law, an object will not change its motion unless a force acts on it. In the second law, the force on an object is equal to its mass times its acceleration.

Answer:

c

Explanation:

the first 35 to 40 acceleration will be 5 same as 40 to 45 ,

5+5=10

Car is moving in a straight line and steadily increases its speed. Then its acceleration in the first is  35 to 40 acceleration will be 5 same as 40 to 45 ,then 5+5=10.

"Speed is the distance traveled per unit of time. It is how fast an object is moving. Speed is the scalar quantity that is the magnitude of the velocity vector. It doesn't have a direction."

"Acceleration is the rate of change of the velocity of an object with respect to time. Accelerations are vector quantities. The orientation of an object's acceleration is given by the orientation of the net force acting on that object. "

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Answer:

As the temperature increases, the kinetic energy of the molecules of the liquid increases.

Explanation:

Answer:c a b I think I might be wrong but I’m pretty sure that’s it

Explanation:

Answer:

Magnification is the degree to which an object is multiplyed to get it's image.

For example if an object size is 10cm an it's image size is 20cm then the magnification is 2, that is the image is twice the size of the object.

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Answer:

1,378.9ms²

Explanation:

Given the following

Distance S = 70.6m

Time t = 0.32secs

Initial velocity = 0m/s

Required

Acceleration

Using the equation of motion

S = ut+1/2at²

Substitute

70.6 = 0+1/2a(0.32)²

70.6 = 0.0512a

a = 70.6/0.0512

a = 1,378.9

Hence the acceleration is 1,378.9ms²

Answer:

Scientists will hope to find a lot of things. Such as lava, fossils, and landmarks.

Explanation:

i farted

I think that it is true, but I'm not exactly sure. :)

Answer:

The needed energy to melt of ice is 1670 J.

Explanation:

Given that,

Mass of ice = 5 g

Specific latent heat = 334000 J/kg

We need to calculate the energy

Using formula of energy

[tex]Q=mL[/tex]

Where, m = mass

L = latent heat

Put the value into the formula

[tex]Q=5\times10^{-3}\times334000[/tex]

[tex]Q=1670\ J[/tex]

Hence, The needed energy to melt of ice is 1670 J.

Answer:

The momentum of the car is 35,000 kg.m/s

Explanation:

Momentum

Momentum is often defined as mass in motion.

Since all objects have mass, if it's moving, then it has momentum. It can be calculated as the product of the mass by the velocity of the object:

[tex]\vec p = m\vec v[/tex]

If only magnitudes are considered:

p = mv

The car has a mass of m=1,000 kg and travels at v=35 m/s. Calculating its momentum:

p = 1,000 kg * 35 m/s

p = 35,000 kg.m/s

The momentum of the car is 35,000 kg.m/s

The momentum of the car is 35000 kgm/s.

Linear momentum, translational momentum, or simply momentum is the product of the mass and velocity of an object. It is a vector quantity, possessing a magnitude and a direction.

If m is the mass and v is the velocity of an object, then the object's momentum p is given below.

[tex]p = mv[/tex]

Given that the mass of the car is m=1,000 kg and travels at v=35 m/s. The momentum is given below.

[tex]p = 1000 \times 35[/tex]

[tex]p = 35000 \;\rm kg m/s[/tex]

Hence we can conclude that the momentum of the car is 35000 kgm/s.

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Answer:            Below...

Explanation:

Fundamental Quantities: based and defined by the process of measurement... some examples are length, mass, time

Derived Quantities:          can be defined through the fundamental quantities... some examples are velocity, volume, pressure

EX:  volume (derived q.) can be measured by mass (fundem. q.)

Answer:

post secondary certificate.

Explanation:

Answer:

post secondary certificate sorry that you got it wrong

Explanation:

Answer:

swim with flotation device

Explanation:

Answer:

C,D

Explanation:

an image is created based on the amont of time it takes for a sound wave to return

Tissues in the babys body reflect high-frequency sound waves

In ultrasound scanning, an image of internal organs is created based on the amount of time it takes for a sound wave to return.Thus, option C is correct.

High-frequency sound waves are used in ultrasound imaging, also known as sonography, to view within the body. Real-time ultrasound imaging allows for the display of blood flowing via blood vessels as well as movement of the body's internal organs.

Contrary to X-ray imaging, ultrasonic imaging does not expose patients to ionizing radiation.A transducer (probe) is positioned either on the skin or inside a bodily orifice during an ultrasonic examination.

To allow the ultrasonic waves from the transducer to pass through the gel and into the body, a small coating of gel is placed to the skin.

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First, we need to understand what we mean by sound and temperature. Sound is the vibration of particles traveling as a wave. Temperature is a measure of energy in a system of particles. A higher temperature means the particles have a higher energy, higher energy means they're moving around faster, and that faster motion makes them more capable of carrying sound waves.

Answer:

21.9m/s²

Explanation:

Given parameters:

Mass of the physics student  = 73kg

Net force  = 1600N

Unknown:

The acceleration at this point  = ?

Solution:

To solve this problem, we apply a knowledge of Newton's second law of motion which is mathematically expressed as;

        F  = m a

F is the friend

m is the mass

a is the acceleration

          1600  = 73 x a

              a  = 21.9m/s²

Answer:

400W

Solution :

power (w) = work done (J) ÷ time(s)

x= 24000J ÷ 60s = 400W

planets

Explanation:

Answer:

The female birds find more attractive which option is likely to happen is discussed below in detail.

Explanation:

All About Robins and How to Attract Them - Natural Birds Unlimited | Wild Birds Unlimited. These birds are interested to inaugurate grasslands and gardens with seasoned underbrush and trees. While they consume a variety of pests and grains or seeds, it has been remarked that they can consume up to 5 meters of earthworms in a day.

Answer:

Social media has helped many businesses grow and promote itself, and has helped people find a better way to connect and communicate with one another. On the other hand, it's also provided many people with problems involving mental health, emotional insecurities, and waste of time

Explanation:

what they said is correct

Answer:

The best glasses have a wider bowl than rim to allow for proper swirling. The swirl releases volatile aroma compounds and creates a vortex in the center of the glass towards which these compounds are drawn

Explanation:\\\

Answer:

90m

Explanation:

Distance is not a vector but a scalar quantity. depicted by a quantity only.

hence:

Distance is equal to 30+40+20 = 90 m

Answer:

Push -repulsion

Pull - attraction

Explanation:

When two magnets are brought together, a push happens when a force of repulsion is experienced where the magnets move away from each other. This means their polarity is the same and this will cause the magnet to push away from each other.

When two magnets are brought together , a pull happens when a force of attraction is experienced where the magnets move close to each other. This means their polarity is different and thus causes the magnets to pull closer to each other.

Answer:

If the temperature of the air in the balloon is less than the temperature of the air surrounding the balloon then the balloon will appear slightly deflated because of the difference in temperature.

As the temperature of the air in the balloon reaches the surrounding air temperature, then the balloon will appear to be fully inflated because the temperature of the air in the balloon is the same as the surrounding air temperature.

Answer:

B: transmission

Explanation: Transmission of waves occurs when waves pass through a given point or medium. Sound waves are transmitted through solids, liquids, and gases therefore the answer is the transmission

Answer:

The first one is: His weight on the Earth before take-off and the weight after take-off back on Earth once he gets back should be recorded as his Independent variable and his dependent variable.

The second one is: If he gained the weight back that he had lost while on the trip then you should disregard them unless that was the weight he was when he weighed himself after he got back.

The Third one is: The mass of an object is the amount of matter it contains, regardless of its volume or any forces acting on it. … Gravity is a force that attracts objects toward the Earth. The weight of the object is defined as the force caused by gravity on a mass.

Explanation:

I took  the quiz earlier. Hope this Helps you.

Answer: 588.9 m/s

Explanation:

Given that :

θ = 30°

Height, h = 3400m

Time, t = 10 seconds

From trigonometry ;

Tanθ = opposite / hypotenus

Tan 30 = 3400 / x

x tan 30 = 3400

0.5773502x = 3400

x = 3400 / 0.5773502

x = 5888.9727

Recall ;

Speed = Distance / time

Speed = 5888.9727 / 10

Speed = 588.897 m/s

Speed = 588.9 m/s

Answer:

Average velocity= 1 m/s

Explanation:

Step one:

given data

total distance covered =  10 meters backwards+  20 more meters backwards

toatal distance= 10+20= 30 meters

time taken = 20 seconds

Required

The average velocity

Step two:

the expression for the average velocity is

Average velocity= total distance/total time taken

Average velocity= 30/30

Average velocity= 1 m/s