Which of the following is a testable hypothesis? A) High levels of salt in soil will probably affect plant growth by either making the plants grow better or causing the plants to die. B) The growth rate of an E. coli bacterial colony will increase as temperature increases from 10 °C to 50 °C. C) Is there a proportional relationship between the number of pimples a person gets and the amount of chocolate he/she eats? D) Hurricanes look larger in images taken by an orbiting satellite than in video footage taken by weather reporters standing on Earth's surface.

QUESTION POSTED AT 09/10/2019 - 11:04 PM

Answered by answersmine AT 09/10/2019 - 11:04 PM

Answer:

The Answer is A

Explanation:

Your welcome

Post your answer

Related questions

Which force causes a soccer ball to fall to the ground after it has been kicked up in the air

Gravity? I'm pretty sure

ANSWERED AT 17/10/2019 - 09:26 AM


QUESTION POSTED AT 17/10/2019 - 09:26 AM

Which energy transfer occurs when a person blows a whistle

Wind energy to sound energy

ANSWERED AT 17/10/2019 - 09:25 AM


QUESTION POSTED AT 17/10/2019 - 09:25 AM

A police car is approaching you with its siren sounding apparently at 330 Hz. When it reaches you, the police car stops and the frequency of the siren is now 300 Hz. If the air temperature is 20 0C, how fast was the police car travelling when it was approaching you?

The change in frequency is called the Doppler effect. The speed of the car can be calculated by the formula for the Doppler effect for when the observer is standing still and the source of the sound is moving towards him:

f¹={V/(V-Vs)}*f,

where f¹ is the frequency of the car while moving towards the observer, V=343 m/s is the speed of sound, Vs is the speed of the car and f is the frequency of the car while standing still.

We need to solve the equation for the Vs:

f¹/f=V/(V-Vs)

V-Vs=V/(f/f¹)

-Vs=V/(f/f¹)-V

Vs=-V/(f/f¹)+V= -343/(300/330)+343=-343*0.91+343=-312.1+343=30.9 m/s

So the speed of the moving police car is Vs=30.9 m/s. 

ANSWERED AT 17/10/2019 - 09:25 AM


QUESTION POSTED AT 17/10/2019 - 09:25 AM

In your own words describe the rotation of the earth and its revolution around the sun in terms of the Foucault Pendulum experiment and parallax and the aberration of starlight.

Rotation of the earth is pulled anf controlled by the core of the sunThe sun travels like a conment towards the centet of the universeAllo

ANSWERED AT 17/10/2019 - 09:16 AM


QUESTION POSTED AT 17/10/2019 - 09:16 AM

What materials have a high buoyancy please hurry

Rubber,Plastic,I think thats it but everyone that can float has a high buoyancy

ANSWERED AT 17/10/2019 - 09:11 AM


QUESTION POSTED AT 17/10/2019 - 09:11 AM

Speed is the rate of change in

Speed is the rate of change of distance.

ANSWERED AT 17/10/2019 - 08:56 AM


QUESTION POSTED AT 17/10/2019 - 08:56 AM

Which type of climate receives the most intense solar energy? A. grasslands climate B. polar climate C. temperate climate D. tropical climate

The answer to your question is D. Tropical Climate. This is because tropical rainforests (or the climate it's self) are/is more likely to be located near the equator where the sun gives off direct solar energy.

ANSWERED AT 17/10/2019 - 08:49 AM


QUESTION POSTED AT 17/10/2019 - 08:49 AM

If a light Ray is reflected off the shiny surface at 170 degrees at what angle did the light-ray first strike the surface

Answer:

The light-ray first strike the surface at angle of 5 degrees.

Explanation:                                                          

It is given that,

If a light Ray is reflected off the shiny surface at 170 degrees. We have to determine the light- ray first strike the surface. It is based on the laws of reflection which states that the angle of incidence is equal to the angle of reflection.

Here, the angle between the reflected ray and the surface is 170 degrees. So, it is clear that the angle between the incident ray and the surface is 5 degrees.

ANSWERED AT 17/10/2019 - 08:45 AM


QUESTION POSTED AT 17/10/2019 - 08:45 AM

A 200.0 kg block of a substance requires 3.59 kj of heat to raise its temperature by 20.0 k. what is the specific heat of the substance? PLEASE HELP ASAP 23 POINTS!

Specific heat capacity = (1/200) x (3590/20) = 0.8975Jkg^-1K^-1= 0.898Jkg^-1K^-1

ANSWERED AT 17/10/2019 - 08:41 AM


QUESTION POSTED AT 17/10/2019 - 08:41 AM

If a resistor draws 1.2 x 10^-3 a of current from a 12 v battery, then what is the value of the resistor? PLEASE HELP ASAP

Value of resistor = (12V) /(1.2 x 10^-3A)=10000ohms=10k ohms

ANSWERED AT 17/10/2019 - 08:39 AM


QUESTION POSTED AT 17/10/2019 - 08:39 AM

The angular momentum of an electron in each of its orbits must be some multiple of: wavelength Planck's constant velocity of light circumference

The Bohr's proposal for the angular momentum of an electron in Bohr's model of the hydrogen atom is:

L=(n*h)/(2π), where n is the number of the energy level and h is the Planck's constant. This equation shows us the quantization of angular momentum of the electron. So the correct answer is the second one: Planck's constant. 

ANSWERED AT 17/10/2019 - 08:27 AM


QUESTION POSTED AT 17/10/2019 - 08:27 AM

Assume that a magnetic field exists and its direction is known. Then assume that a charged particle moves in a specific direction through that field with velocity (v). Which rule do you use to determine the direction of force on that particle? A. first right-hand rule B. second right-hand rule C. third right-hand rule D. fourth right-hand rule

 The first right-hand rule determines the directions of magnetic force, conventional current and the magnetic field.  Given any two of theses, the third can be found. 
The second Right-Hand Rule determines the direction of the magnetic field around a current-carrying wire and vice-versa 
So, assuming that a magnetic field exists and its direction is known and assuming that a charged particle moves in a specific direction through that field with velocity (v(, to determine the direction of force on the particle we should use the second right-hand rule.

ANSWERED AT 17/10/2019 - 08:23 AM


QUESTION POSTED AT 17/10/2019 - 08:23 AM

The extraction of oil from oil shales can be detrimental to the environment mainly because this process requires large amounts of A.) Land B.) Water C.) Explosives D.) Heavy equipment

I believe the correct answer would be A. The extraction of oil shale is detrimental to the environment mainly because the process of extraction requires large amounts of land. Lands are being excavated in order to locate areas which contains the oil. This is not good since it affects ecosystems and destroy habitats.

ANSWERED AT 17/10/2019 - 08:21 AM


QUESTION POSTED AT 17/10/2019 - 08:21 AM

The changing of water into hydrogen and oxygen gas is an example of a what type of change? A) Chemical B) Phase C) Thermal D) Thawing

Hey your answer to this would be

a. Chemical change

Hope this helped you!

ANSWERED AT 17/10/2019 - 08:18 AM


QUESTION POSTED AT 17/10/2019 - 08:18 AM

A satellite is orbiting Earth in an approximately circular path. It completes one revolution each day (86,400 seconds). Its orbital distance is 22,500 kilometers from the Earth's center. What is the satellite's average speed?

@AL2006 had answered this before: Well, first of all, wherever you got this question from has done 
a really poor job of question-writing.  There are a few assorted 
blunders in the question, both major and minor ones:

-- 22,500 is the altitude of a geosynchronous orbit in miles, not km.

-- That figure of 22,500 miles is its altitude above the surface, 
   not its radius from the center of the Earth. 

-- The orbital period of a synchronous satellite has to match 
    the period of the Earth's rotation, and that's NOT 24 hours.  
    It's about 3 minutes 56 seconds less ... about 86,164 seconds. 

Here's my solution to the question, using some of the wreckage 
as it's given, and correcting some of it.  If you turn in these answers
as homework, they'll be marked wrong, and you'll need to explain 
where they came from.  If that happens, well, serves ya right for
turning in somebody else's answers for homework.


The satellite is traveling a circle. The circle's radius is 26,200 miles
(not kilometers) from the center of the Earth, so its circumference 
is (2 pi) x (26,200 miles) = about 164,619 miles.

    Average speed = (distance covered) / (time to cover the distance)

                             = (164,619 miles) / day
                                (264,929 km)

                             =      6,859 miles per hour
                                  (11,039 km) 

                           =          1.91 miles per second
                                      (3.07 km)

ANSWERED AT 17/10/2019 - 08:16 AM


QUESTION POSTED AT 17/10/2019 - 08:16 AM

Check my answers? An astronomer sees two stars in the sky. Both stars are equally far from Earth, but the first star is brighter than the second star. Which of the following is a valid conclusion about the first star? It is larger than the second star. It is smaller than the second star. It is older than the second star. It is younger than the second star. I think it is C but I think I read something about younger stars being brighter.

Answer:

It is larger than the second star.

Explanation:

  Stars that are closer will also appear brighter . Since both the stars are at equal distance from the Earth, the one which is larger appears more brightly than the other. Thermonuclear fusion reactions that occur in the core of a star are the reason behind the brightness of a star. Larger stars have larger fuel (hydrogen, helium gases). Larger ones have more energy and shine much brighter.

Even more massive stars are also brighter. So younger stars are not that massive to appear very bright, compared to massive and larger stars.

ANSWERED AT 17/10/2019 - 08:15 AM


QUESTION POSTED AT 17/10/2019 - 08:15 AM

A(n) ___ keeps a reaction from occurring by increasing the activation energy required for a reaction to occur. A. inhibitor B. catalyst C. stopper D. synthesis

A. inhibitor

think about what inhibit means, it means to keep something from happening.

ANSWERED AT 17/10/2019 - 08:09 AM


QUESTION POSTED AT 17/10/2019 - 08:09 AM

Which of the following does NOT contribute to wellness? A. habits B. tendencies C. exercise D. diet

the one that does not contribute to wellness is : D. Tendencies Tendency refer to an individual's natural characteristic or behavior. For example, two person might have different characteristics, one of them tend to like to spend her time reading books and the other one like to spend her time by socializing. But if they're doing it in moderate amount, they can still have a same level of wellness.

ANSWERED AT 17/10/2019 - 08:00 AM


QUESTION POSTED AT 17/10/2019 - 08:00 AM

What principle do all modern camaras use to form images

I believe they use Refraction.

ANSWERED AT 17/10/2019 - 07:57 AM


QUESTION POSTED AT 17/10/2019 - 07:57 AM

When baking soda and vinegar react, the surface bubbles. What does this most likely indicate?

A chemical reaction??

ANSWERED AT 17/10/2019 - 07:52 AM


QUESTION POSTED AT 17/10/2019 - 07:52 AM

How is it possible for a convex lens to form a real image? A)exiting light rays refract toward the normal and intersect at the focal point B) light rays refract and travel parallel to the principal axis C) exiting light rays travel backward and bend toward the normal D) light rays travel though the focal point on the way to the lens

Answer:

A

Explanation:

When the two refracted rays meets actually, then the image formed is real.

In case of convex lens, in every position of object the image formed is real except when the object placed between optical centre and the focus of the lens.

When the object placed between the optical centre and the focus of the convex lens the image formed is virtual.

So, option (A) is correct.

ANSWERED AT 17/10/2019 - 07:42 AM


QUESTION POSTED AT 17/10/2019 - 07:42 AM

What is the radius of a communications satellite’s orbital path that is in a uniform circular orbit around Earth and has a period of exactly 24.0 hours (86,400 seconds). (Measurement is from the center of Earth.)

Answer:

42400 km

Explanation:

The time taken by a satellite to complete one revolution around the earth is called the time period of the satellite.

The time period for the satellite is given by

T = \frac{2\pi }{R}\times \sqrt{\frac{(R+h)^{3}}{g}}

where, R be the radius of earth, h be the height of satellite from earth's surface and g be the acceleration due to gravity.

Substitute, 86400 s for T, 6400000 m for R and 9.8 m/s^2 for g , we get

86400 = \frac{2\pi }{6400000}\times \sqrt{\frac{(6400000+h)^{3}}{9.8}}

h = 35954355.13 m

h = 36 x 10^3 km

Distance from the centre of earth is R + h = 6400 km + 36000 km = 42400 km .

ANSWERED AT 17/10/2019 - 07:30 AM


QUESTION POSTED AT 17/10/2019 - 07:30 AM

A two-year college-level degree is called

Level degree is what it would be called

ANSWERED AT 17/10/2019 - 07:29 AM


QUESTION POSTED AT 17/10/2019 - 07:29 AM

A four-year college-level degree is called

A four-year college-level degree is called a bachelor degree.
If you decide to continue your education after receiving your bachelor degree, you will then pursue an associate degree. 
If you decide to further pursue a higher degree after receiving an associate degree, you will then pursue a master degree.
Finally, once you have received your master degree, if you want to pursue an even higher education, you will then pursue a doctorate degree, or PhD.


ANSWERED AT 17/10/2019 - 07:28 AM


QUESTION POSTED AT 17/10/2019 - 07:28 AM

Identify the magnetic North Pole of Earth's magnet

Answer:

As we know that magnetic field lines always originated out from the north pole of magnet and then terminate at south pole of the magnet

So here in order to find out the magnetic north pole we can say that magnetic field lines will originated out from that pole

In order to find out that part of earth from which magnetic field lines originated out we have to suspend a bar magnet freely in the air.

Now the south pole of bar magnet is always attracted towards the North pole of Earth magnetic field

So when We freely suspend the bar magnet then its south pole always shows the position of North pole of Earth magnetic field.

So we can say that the Geographic south position of Earth is the magnetic North pole of Earth

ANSWERED AT 17/10/2019 - 07:24 AM


QUESTION POSTED AT 17/10/2019 - 07:24 AM