An extraterrestrial civilisation lives on a planet with a very elliptical orbit. Additionally, thousands of large asteroids orbit their solar system. The civilisation uses the light from their home star to count the number of asteroids in the direct line between the star and their planet. For a first measurement, they count the asteroids for 60 days and detect 1000 objects. Several months later, they start a second measurement: This time, they count for 80 days. How many asteroids will they detect during the second measurement? Explain why. (Note: Assume that the asteroids are homogeneously distributed in their solar system.)





i will mark as a brainiest please help me as soon ​

Answer:

0 m/s²

Explanation:

Acceleration is defined as the rate of change of velocity:

[tex]acceleration = \frac{change \space\ in \space\ velocity}{time taken}[/tex] .

As the velocity is constant, change in velocity = 0.

∴ acceleration = 0/ 10

                        = 0 m/s²

The rarest type of galaxies is the elliptical double-ringed galaxy.

elliptical double-ringed galaxy is considered as the rarest type of galaxy because of its small number. The example of such type of galaxy is PGC 1000714. Scientists suggest that about 0.1% of galaxies are of this type.

So we can conclude that the rarest type of galaxies is the elliptical double-ringed galaxy.

Learn more about galaxy here: https://brainly.com/question/13956361

#SPJ11

Answer:

The car will stop after 4 seconds after moving the distance of 0.08km.

Explanation:

The reading above it clearly states that a car is moving at a speed of 72Km/hr. And it asking for the distance the car move when it stops after 4 seconds.

Looking at speed formula , speed=distance÷time.

But in this problem we I finding distance, so in speed formula make distance the subject.

Before going ahead you should have this in mind the unit for distance is Km and m . Our speed is in Km/hr but our time is in second. In this case change 4 seconds to hour which is 0.00111 hr .you change second to hour because hr will cancel hr when solving for distance giving distance unit Km

Distance = speed × time

Distance= 72km/hr × 0.00111 hr

hour cancel hour

Distance= 72km × 0.00111

Distance = 0.08km

Therefore the car will stop after 4 seconds after moving the distance of 0.08km.

Please mark brainliest.

conversion :

72 km/h = 72 × (1000/3600) = 20 m/s

so, in 4 seconds it travel

Answer:

75%

Explanation:

Efficiency=MA/VR*100

=3/4*100

=0.75*100

=75%

Answer:

Periodic

Explanation:

The groups in the periodic table that want to gain electrons are groups; 15, 16 and 17. The members of these groups are mostly nonmetals.

The velocity is 6.75

The velocity in the equation stated above can be calculated as follows

m= 2,000
p= 2.25

y= 6000

velocity= 2.25 × 6000/ 2000
= 13500/2000
= 6.75

Hence the velocity is 6.75

Please see the link below for more information.
https://brainly.com/question/23547288?referrer=searchResults

The total cost for the energy used if electricity costs 10p per unit is determined as 2p.

The total energy consumed during the process is calculated as follows;

E = Pt

where;

E = (800 W/1000) x (2.5 /60)   + (2 kW) x (5/60)

E = 0.8 kW x 0.042 hr     +    2kW x 0.083 hr

E = 0.0336 kW-hr  +  0.166 kW-hr

E = 0.1996 kW-hr

C = E x 10p

C = 0.1996 kW-hr x 10p

C = 1.996p

C ≈ 2p

Thus, the total cost for the energy used if electricity costs 10p per unit is determined as 2p.

Learn more about cost energy here: https://brainly.com/question/3303657

#SPJ1

To find how far away the school is:

3m/s * 30 s = 90m

Hope it helps!

All move at the same speed.

Explanation:

Electronic magnetic spectrum includes radio waves, micro waves, infra red, visible light, ultra violet, x-rays, gamma rays. These all electromagnetic waves travel at the same speed of light of about 300,000,000 m/s through vacuum. Though they have different wavelength, their speed is same.

Answer:

I think it would be C: open primary

Explanation:

Answer:

Titan.It is the largest moon of Saturn

Answer:

All move at the same speed

Explanation:

because they are all waves of the electromagnetic spectrum and they all travel at the speed of light

(300 000 km/s)

The vector B will have two components and those components will be called resultant vectors.

A component vector is a unit vector that represents a given vector in a particular direction.

A vector can be represented in x - direction and y - direction.

Thus, the vector B will have two components and those components will be called resultant vectors.

Learn more about component vectors here: https://brainly.com/question/13416288

#SPJ12

Explanation:

Light Light from a moving source travels at 300,000 km/sec (186,000 miles/sec).

Note:

The Speed of Light Is Constant.

Explanation:

LIGHT TRAVELS AT A CONSTANT VELOCITY OF 300,000 km/sec.

Answer:

No

Explanation:

In order for the rope to be perfectly horizontal, there must be a vertical component in tension

The speed the golf must have initially to reach the hole is 31.32`1 m/s.

When an object is thrown at an angle from the horizontal direction, the object is said to be in projectile motion. The object which follows the projectile motion.

A golfer wishes to chip a shot into the hole 50m away on flat level ground. if the ball flies to a maximum height of 25m.

The angle with which the ball flies,

tan θ = 25 m/ (50m/2)

tan θ =1

θ  =45°

If u is the initial speed, the maximum height of the ball is

H = u² sin²θ / 2g

Put the values, we get

25 =  u² sin²45 / (2x9.81)

u = 31.321 m/s

Thus, the initial speed is 31.321 m/s

Learn more about projectile.

brainly.com/question/11422992

#SPJ1

Answer:

A downward force of magnitude 5 N is exerted on the book by the force of ... Do the downward force in Part A (gravity) and the upward force in Part B ...

The number of formula units would be  2.5 x  [tex]10^2^3[/tex]

This is mathematically given as: mole x Avogadro number

Molar mass of the aluminum sulfide (Al2S3) sample = 26.98 x 2 + 32.06 x 3

= 53.96 + 96.18 = 150.14 g/mole

Mole of 62.2 g aluminum sulfide = 62.2/150.14 = 0.4143 moles

Formular unit = 0.4143 x 6.023 x [tex]10^2^3[/tex] = 2.5 x  [tex]10^2^3[/tex]

More on formula units can be found here: https://brainly.com/question/21494857

#SPJ1

Answer:

The amount of thermal energy needed is 626.6 J

Explanation:

When a certain amount of heat energy Q is supplied to a substance, the temperature of the substance increases according to the equation

where m is the mass of the substance is the specific heat capacity of the substance is the change in temperature

Answer:

642.6 kJ

Explanation:

Using the formula for heat energy required:

[tex]Q = mc \Delta T[/tex] ,

where:

C   → specific heat capacity  =  1.68 kJ/kg°C

Q   → heat energy required  =  ?

m   → mass of the object  =  4.5 kg

ΔT → change in temperature  =  97°C - 12°C  =  85°C,

Q = 4.5  x  1.68  x  85

   = 642.6 kJ

The velocity of the ball at position A is 3.13 m/s.Since all energy is converted to KE.

The potential energy is due to the virtue of the position and the height. The unit for the potential energy is the joule.

A person has the most potential energy due to her position. when he is sitting on the highest point.

Given data;

Mass,m = .5 kg

Height,H = 0.5 m

Acceleration due to gravity,g = 9.8 m/s²

H is the height

The potential energy is found as;

The potential energy is mainly dependent upon the height of the object.

Potential energy = mgh

The potential energy at point B;

PE = mgh

PE = ( 1.5 kg) ( 9.8 m/s2) (0.5 m)

PE = 7.35 J

Since all energy is converted to KE, the kinetic energy at point B;

KE = 0.5mv^2

KE = PE

7.35 = 0.53(1.5) v^2

V = 3.13 m/s

Hence, the velocity of the ball at position A is 3.13 m/s.

To learn more about the potential energy, refer to the link;

https://brainly.com/question/24284560

#SPJ1

From the head wind component charts,  the crosswind component for a landing on runway 18 is 19 knots.

When winds are not parallel to or directly with  the line of travel, the wind is said to have a crosswind component.

From the head wind component charts, at 220° at 30 knots, the corresponding crosswind component is 19 knots.

Thus, from the head wind component charts,  the crosswind component for a landing on runway 18 is 19 knots.

Learn more about crosswind component here: https://brainly.com/question/14320579

#SPJ12

Answer:

1). Brake pedal or lever

2). A pushrod also called an actuating rod

Answer:

it is easier to kick a stone than to drag a stone.

Explanation:

the science behind the question is fairly simple.

when you kick and object for say a (rock) you have inertia which is made from you clocking your leg back and swinging it full force forward. when you kick with inertia, you will have a much further travel distance of the object rather than dragging it which is almost set at a certain rate of how fast you are moving (m) and how much inertia you are using by pulling (p)

so m+p=i for inertia. hope this  helped

Answer:

D

Explanation:

The magnitude is 13 m/s

   the direction is east    the   units  are  m/s

Answer:

Motion of an object that travels in a curved path under the influence of Earth's gravitational field. Examples include throwing a ball, javelin throw, and golf ball.

Explanation:

Answer:

1. In sports.

2. In programming or Animation.

3. In home appliances.

4. In military.

Explanation:

1. In sports. Being common in sports, projectile motion is applied in motion of a projectile which is usually a ball. This is because we are able to calculate the angle of the flight developed by a ball to maximize its distance or velocity. For example in baseball and basketball.

2. In programming or Animation. Considering that there is a challenge for animators and programmers in modern world, physics is applied in televisions or video games. For example a baseball being hit by a player in video game or TV, it should look real. Hence the application of projectile motion.

3. In home appliances. Appliances for example hose or water gun uses an application of projectile motion. As the water exits the hose or water gun, the angle over which the water travels depends on the distance moved and force that is being applied.

4. In military. Bullets being shot from the barrel of the gun is a projectile in air. The speed of the bullet is higher than that of the water exiting the hose therefore it will travel a longer distance. The manufacturers of weapons such as a gun tries to maximize the speed while minimizing gun's recoil.

A Stable Ride is the main characteristic of a catamaran hull.

Catamaran Hull is a multi-hulled watercraft, which have two parallel hulls of equal size.

The characteristic of a catamaran hull are as follows:

Therefore, Catamarans has a stable ride, according to their characteristic.

Learn more about catamaran hull here:

https://brainly.com/question/11184488

#SPJ1

Momentum= mass × velocity

momentum= P

P= m×v

P= 5×4.5

P=22.5

I hope this helps.

The difference in time between the sound waves being detected at the other end of the plank and the sound being heard through the air will be 0.09 sec.

A sound wave is produced when a medium begins to vibrate. When an entity vibrates, a pressure wave is formed, which causes sound.

Given data;

The speed of sound in wood,u= 3300 m/s

The speed of sound in air,v=330 m/sec

long plank of wood, L=33 m

The time period in the air was found as;

T₁ = 33 m / 330 m/sec

T₁= 0.1 sec

The time period in wood ;

T₂= 33 m / 3300 m/sec

T₂=0.01 sec

T = T₁ - T₂

T=0.1-0.01

T=0.09 sec

Hence, the difference in time between the sound waves being detected at the other end of the plank and the sound being heard through the air will be 0.09 sec.

To learn more about the sound wave, refer to https://brainly.com/question/11797560.

#SPJ1