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3 years ago

What 2 rules do scientists use to determine if something is a planet.

2 answers:

5 0

Answer: one of the things that determinates something is a planet and not a star is that planets are constanlty moving around the sun while stars are "still"

Explanation:

velikii [3]3 years ago

3 0

Answer:

1. It must orbit a star (in our cosmic neighborhood, the Sun).

2. It must be big enough that its gravity cleared away any other objects of a similar size near its orbit around the Sun.

Explanation:

I hope this helps!

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Indicate whether the following statements are always true or can be false. An object's velocity will change if a net force acts

Sergio [31]

Answer:

1-An object's velocity will change if a net force acts on the object. (True)

2-In order not to slow down, a car moving at a constant velocity needs a small net force applied. (False)

3- The net force which acts on an object which remains at rest is zero. (True)

4- If an object's speed does not change, no net force is acting on the object.(True)

5- If two objects are under the influence of equal forces, they have the same acceleration. (False)

6- During the collision of a car with a large truck, the truck exerts a greater force on the car than the car exerts on the truck.(False) (Newton Third Law)

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3 years ago

In a physical change a substance changes from one Blank to another

attashe74 [19]

Answer:

In a physical change a substance changes from one PHASE to another

7 0

3 years ago

To understand the relationships between the parameters that characterize a wave. It is of fundamental importance in many areas o

Monica [59]

Answer:

1) c.

2) a.)

Explanation:

At any wave, if its waveform repeats itself every time interval T, it is said that the wave is periodic, with a period T, which is the time needed to complete an entire cycle. The other options refer at the way in the waves propagates (longitudinal or transversal) and to the type of waveform (sinusoidal), so the right answer is c).

At any wave that propagates at a constant speed, there exists a fixed relationship between the velocity v, the frequency f and the wavelength λ, as follows:

$v = \lambda * f (1)$

So in order to v keep constant, if the frequency is increased, the wavelength will decrease in the same proportion, so a) is the right answer.

7 0

3 years ago

"The International Space Station (ISS) orbits at a distance of 350 km above the surface of the Earth. (a) Determine the gravitat

vagabundo [1.1K]

Answer:

(a) g = 8.82158145 $m/s^2$ .

(b) 7699.990192m/s.

Explanation:

(a) Strength of gravitational field 'g' by definition is

$g = \frac{M_{(earth)} }{r^2} G$ , here G is Gravitational Constant, and r is distance from center of earth, all the values will remain same except r which will be radius of earth + altitude at which ISS is in orbit.

r = 6721,000 meters, putting this value in above equation gives g = 8.82158145 $m/s^2$ .

(b) We have to essentially calculate centripetal acceleration that equals new 'g'.

$a_{centripetal}=\frac{V^2}{r} =g$ here g is known, r is known and v is unknown.

plugging in r and g in above and solving for unknown gives V = 7699.990192m/s.

(c) S = vT, here T is time period or time required to complete one full revolution.

S = earth's circumfrence , V is calculated in (B) T is unknown.

solving for unknown gives T = 5484.3301s = 1.5234hours.

3 0

3 years ago

Name the instrument used to control current in an electric circuit. Guys please help me

Delvig [45]

The instrument which is used to control current in an electric circuit is rheostat. 

Hope this helps :)

8 0

3 years ago

What 2 rules￼￼ do scientists use to determine if something is a planet￼.

What 2 rules do scientists use to determine if something is a planet.