a cluster with a lot of type o and b stars, but no bright k or m stars, is very group of answer choices old. faint. young. poor in heavy elements. densely packed.

The time it takes the object to fall freely at a distance of 120m is  7.75 sec.

Velocity is the directional pace of an item in motion as an indication of its rate of exchange in the role as determined from a selected frame of reference and as measured by way of a selected standard of time.

Calculation:-

mass = 20 kg

height = 200 m

new height = 120

S = ut +1/2at²

120 = 0 + 0.5× 10 t²

t² = 120/5

    =  60

   = 7.75 sec

Average velocity is calculated by means of dividing your displacement (a vector pointing out of your initial role in your final position) through the entire time; the average pace is calculated by way of dividing the overall distance you traveled by means of the total time.

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The force that the skydiver pull up on the earth with a mass of 37.9 kg is 371.42 N.

Force can be defined as the product of mass and acceleration.

The force that the skydiver pull up on the earth with is the same as its weight. To calculate the weight of the skydiver, we use the formula below.

Formula:

Where:

From the question,

Given:

Substitute these values into equation 1

Hence, the force that the skydiver pull up on the earth is 371.42 N.

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The upward force experienced by Dee during the instance is 366.3 N

According to Newton's law, we understood that force, mass and acceleration are related by the following formula:

Force (F) = mass (m) × acceleration (a)

F = ma

With the above formula, we can determine the upward force experienced by Dee. Details below.

From the question given above, the following data were obtained:

Force = mass × acceleration

Upword force = 45 × 8.14

Upword force = 366.3 N

Thus, the upword force is 366.3 N

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Tension in the string is  F = 2.415 N

Acceleration needed to keep the ball in a circle is    α = 13.803 m/s²

It is given that:

mass of the ball,  m = 175g = 0.175Kg

The radius of the circle, r = diameter/2 = 0.5m

The ball makes 2.0 revolutions every 1.0 s. So, angular speed is

ω = 4π radian/sec

Since, it is moving in circular path so centripetal acceleration will act here.

So, centripetal acceleration  α = mω²r

                                            α = 0.175Kg × ( 4π )² × 0.5

So,                                      α = 13.803 m/s²

Hence, the acceleration is  13.803 m/s² and it is directed toward the center of rotation.

Tension is a force that is given by:  F = ma

                                                        F = 0.175Kg × 13.803 m/s²

                                                        F = 2.415 N

Friction is a force, the resistance of motion when one object rubs against any other. On every occasion objects rub towards every different, they purpose friction. Friction works against the movement and acts on the contrary direction.

Friction can slow matters down and forestall stationary things from shifting. In a frictionless global, more objects would be sliding about, clothes and shoes would be difficult to preserve and it might be very tough for human beings or motors to get transferring or exchange routes.

Contact forces are the kind of forces that perform between objects which are in physical touch with each other.

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Answer:

below

Explanation:

vf = at = 18 (150) = 2700 m/s

d = 1/2 a t^2 = 1/2 ( 18)(150^2) = 202.5 km

According to Lenz's law direction of the induced current is in such a way that it opposes the change in magnetic flux. So the direction of the induced magnetic field will be along the axis of the solenoid and towards the magnet. and the direction of the induced current will be clockwise.

As the bar magnet moves relative to the solenoid the solenoid's magnetic field changes. Therefore, a current is induced in the magnetic coil, which induces a magnetic field. The induced current is counterclockwise when viewed from the direction of the increasing magnetic field.

The direction of the field can be determined by the right grip rule. For a single long straight wire, the direction of the electric field is given by placing the right thumb in the direction of the current and bending the fingers in the direction of the electric field. As the bar magnet moves freely, it oscillates until one end moves toward the Earth's North Pole and the other toward the Earth's South Pole.

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The number of platinum (pt) atoms in the cube is 6.6* 10⁻²² .

Number of atoms in a molecule of given weight can be calculated by dividing the total mass of molecule by mass of single atom .

we have provided the following informations,

length of edge = 1.10 cm

density of platinum (pt) = 21.45 g/cm³

Mass of single platinum (pt) atom

= 3.2×10⁻²² g

For calculating the number of platinum atoms present in cube first we find out the amount of platinum present in grams.

density of atom = mass of atom (grams) / Volume of solution(cm³).

21.45 g/cm³ = mass of pt in grams /1.0cm³

mass of platinum present in grams

=21.45 g

Using the Atomicity, number of atoms present is

21.45 g / 3.2 × 10⁻²²g = 6.6 × 10⁻²²platinum atoms.

Therefore, the number of platinum (pt) atoms is 6.6× 10⁻²² .

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The current through R1 immediately after the switch is opened which has been closed for a long time is 0.5 A ( up )

Vc = V30Ω + V10Ω

Vc = I R2

Vc = Voltage across capacitor

V30Ω = Voltage across 30Ω resistor

V10Ω = Voltage across 10Ω resistor

I = Current

R2 = Resistance across resistor 2

I = 2 A

R2 = 10 Ω

Vc = 2 * 10

Vc = 20Ω

V = I R

V30Ω = 30 I

V10Ω = 10 I

Vc = V30Ω + V10Ω

20 = 30 I + 10 I

20 = 40 I

I = 1 / 2

I = 0.5 A ( up )

Therefore, the current through R1 immediately after the switch is opened is 0.5 A ( up )

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Tension of the rope is 183.75 N.

In medium lengths, tension exerts its force, especially in flexible materials like rope or cable. The force of tension is still a gravitational force. The tension will be referred to as the T = W + ma if the body is traveling upward. The thickness remains constant as the body descends, T = W - ma.

The total Tension on the rope at this point=

Sum of the weight of the ball + the centripetal force on the ball

T= W+ mv^2/r

Where T is tension, W is weight of the ball, m is mass of the ball, r is radius of rotation, v is the velocity of rotation. g= acceleration due to gravity

W= 120N

m= W/g= 120/9.8 = 12.24kg

v= 5m/s

r= 4.8m

Therefore,

T= 120 + 12.24×5^2/4.8

T= 120 + 63.75

T= 183.75N

complete question :

a heavy ball with a weight of 120 n is hung from the ceiling of a lecture hall on a 4.8-m-long rope. the ball is pulled to one side and released to swing as a pendulum, reaching a speed of 5.1 m/s as it passes through the lowest point. What is the tension in the rope at that point?

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High mass stars produce energy at a faster rate and use carbon in a process that fuses hydrogen to helium.

What is energy ?

Energy, in physics the ability to do work. It can exist in electrical, kinetic, thermal, electrical, chemical, nuclear, or various other forms. There is also heat and work. H. Energy in transfer from one object to another. After transmission, energy is always referred to according to its nature. Thus, the heat transferred can become thermal energy, while the work done can appear as mechanical energy. All forms of energy are associated with movement. For example, any object has kinetic energy when it is in motion. A taut device such as a bow or spring can create motion even when stationary. Because of its composition, it contains potential energy. Similarly, nuclear energy is potential energy as it results from the composition of subatomic particles within the nucleus.

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Increased intensity throughout a workout, whether it be aerobic or anaerobic, improves insulin sensitivity, raises lactate threshold, and accomplishes a number of other benefits.

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Answer:

Below

Explanation:

First of all, the horizontal speed is irrelevant to the question...not needed.

The time to hit the ground can be computed by

HEIGHT = 1/2 a t^2         where a = 32.2 ft/s^2   or 9.81 m/s^2

     solve this for 't' in seconds

as the HEIGHT was not given in the question, this cannot be answered though you can say     t =   sqrt ( 2 * height / a )

If 2 stars, a & b is the same size, and star a is main sequence star, and starsb is a giant, then in term of temperatures star a is hotter than star b.

Main sequnce stars including sun, lie along a diagonal the band in the H-R Diagram. They have temperature characteristic from 3,000 to >50,000K.

Meanwhile the giant stars, they are brighter than main sequence stars but with the same effective temperatures.

Therefore, from the characteristic of main sequence stars, the comparation of temperatures is star a is hotter than star b.

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Sarah will get - 7 after solving this equation

BODMAS is a rule to explain order of operations in calculations. BODMAS stands for Brackets, Order, Division, Multiplication, Addition, Subtraction. '

5(4 −8) + 7 −2(-8 + 5)

5(-4) + 7 - 2(-3)

-20 + 7 + 6 = -7

Sarah will get - 7 after solving this

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1134 kgm/s is the momentum of the dog weighing 18 kg runs into a park at a velocity of 63 m/s.

Formula to calculate momentum:

M = mv,

Where: M = Momentum

            m = Mass

             v = Velocity

let given,

mass m =  18 kg

velocity v = 63 m/s

substitute the values in above equation

Momentum, M =  (18×63)

Momentum, M = 1134 kgm/s

Hence, the momentum of the dog is 1134 kgm/s.

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The car stops after travelling a distance 42.1 ft.

The rate at which a body's displacement changes in relation to time is known as its velocity. Velocity is a vector quantity with both magnitude and direction is displacement.

Given parameters:

Initial velocity of the car; u = 40 ft/sec.

Final velocity of the car; v = 0 ft/sec.

Deceleration of the car; a = 19 ft/sec².

We have to find, distance travelled by the car before stops; d = ?

For decelerated motion, we know that;

v² = u² - 2as

Putting all values, we get;

0² = 40² - 2×19×s

⇒ s = (40×40)/(2×19)

= 42.1 ft.

Hence,  distance travelled by the car before stops is 42.1 ft.

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Answer:

exothermic

Explanation:

The required average speed to reach the school will be 2.5 meters per second.

According to the question,

School is still 1500m away and it starts in 10 minutes. We need to determine at what average speed you need to travel to reach the school on time.

What is speed?

Speed is defined as when an object is subjected to move, the distance covered by the object in a certain time interval is the speed of that particular object.

Here it is given,

Distance = 1500m

Time = 10 minutes or 10×60(seconds) = 600 seconds

Speed = distance/time

Speed = 1500/600

Speed = 2.5 meters per second

Thus, the average speed needed to reach the school at a distance of 1500m in 10 minutes will be 2.5 meters per second.

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The average power a car engine needs to bring a car of 2100 kg from rest to a highway speed of 65.0 mi/h in 13.0 s is 136.79 KW

W = F d cos θ

F = m a

a = v / t

v = Velocity

t = Time

m = Mass

a = Acceleration

W = Work done

F = Force

d = Distance

θ = Angle between force and displacement vector

v = 65 mi / h = 29.1 m / s

t = 13 s

m = 2100 kg

a = 29.1 / 13

a = 2.24 m / s²

F = 2100 * 2.24

F = 4700.77 N

W = F v t

W = 4700.77 * 29.1 * 13

W = 1778.3 KJ

P = W / t

P = Power

P = 1778.3 / 13

P = 136.79 KW

Therefore, the average power of the car engine is 136.79 KW

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According to the special theory of relativity, while traveling at very high speed your own pulse rate that you measure will increases.

The time interval between two events is not constant from one observer to the next, but instead depends on the relative speeds of the observers' reference frames (e.g. the twin paradox is a situation in which one twin departs in a spacecraft at nearly light speed and returns to find that the other twin has aged significantly more. The paradox is that at constant speed, we are unable to tell which twin is travelling and which twin is not.)

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Answer:

oven mitt covering your hand (figure 70.27). This is an example of rapid heat transfer by the heating of a solid, the oven mitt.

Explanation:

please give brainliest, really appreciated.

because the in falling matter has some angular momentum that is why matter falling towards a white dwarf, neutron star, or black hole in a binary system form an accretion disk.

The mass falls toward the central body, causing conservation of angular momentum to enhance the orbital speed. As a result, a rotating disc is created by the falling materials.

what is Angular momentum?

Angular momentum is any rotating object's characteristic determined by moment of inertia times angular velocity. It is a characteristic of rotating bodies determined by the sum of their moment of inertia and angular velocity.

The mass, motion, and distance of an object's mass from the centre of rotation all affect angular momentum, also known as spin.

Therefore, because the in falling matter has some angular momentum that is why matter falling towards a white dwarf, neutron star, or black hole in a binary system form an accretion disk.

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The minimum height of the loop without falling it off is 2.7(R-r).

What is height?

height is the measurement of someone or something .

Sol-It is given that capital art Israelis of loop. The loop. Small M. Is the mass of the marble. Small art is radius of the marble. We have to find minimum height edge. The track must have for the marble to make it around the loop. The loop without falling off coming to the solution. We have art is radius of solid marvel. Capital art is radius of circular, loop. Track moment of inertia of this is all in I is equal to two divided by five M. R squared. Thank you lad velocity of the marvel is equal. Do your makeup when the slides down the incline plane and regis the top of the loo. Let this be equation to and let this be equation three gain in potential energy related to center of mass is equal to mg. Multiplied by to capital R minus smaller. Let this be equation four. From law of conservation. Oh Nrg we have Equation one is equal to equation too plus equation three plus equation four substituting we have M G multiplied by H plus R is equal to half M V squared plus half I omega squared plus MG multiplied by two R -R. M G multiplied by H plus R. Is equal to half M B squared plus half. Multiplied by two divided by five M R squared. Omega square plus MG.

Hold square plus M G. Multiplied by two R minus R divide M G. On both sides we have H. Plus art Is equal to seven divided by 10, multiplied by R -R. Plus to r minus R. H plus odd as it will do 2.7 R -1.7 are therefore H is equal. Do 2.7 multiplied by R -R. Hence it can be concluded that height of the track. H is equal to 2.7 multiplied by R -R.

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The two main steps in protein synthesis , along with the key molecules involved in the process include the following below:

This is referred to as a biomolecule which contains amino acids and it is necessary for the growth and repair of worn out tissues in the body. They are broken down in the body by enzymes known as protease and are easily denatured by heat and chemicals.

In the process of transcription, the gene is converted into a template molecule called messenger RNA (mRNA) and involves the transfer of genetic materials.

Translation on the other hand involves protein synthesis in the ribosome in which the mRNA is converted into protein thereby making it the correct choice.

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The shorter the wavelength of light, the greater the refraction. As a result, red light refracts the least and violet light refracts the most, spreading the colored light across the spectrum.

Dispersion, the phenomenon in which the phase velocity of a wave depends on its frequency. The term "chromatic dispersion" is sometimes used specifically for optical systems. When white light passes through a glass prism, it is broken down into a spectrum of colors (in the order violet, indigo, blue, green, yellow, orange, red) and this process of splitting white light into individual colors takes place is called dispersion.

When light hits a water droplet, it refracts at the boundary between air and water and enters the water droplet, where it scatters into seven colors. The rainbow effect occurs because light reflects inside the droplets and is eventually refracted back into the air.

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The temperature increase is 0.24°C.

Solution:

Gravitational potential energy = mgh

= 1.4*9.8*807 = 11072.04 J

19% of PE = heat energy

0.19*11072 = mcΔ

1439.3652 = 1.4*4186*Δ

Δ = 0.24° C

so the temperature increase is 0.24°C.

Gravitational potential energy is converted to thermal energy at the fire point. When an object high above the ground heats a surface or other object, it produces thermal energy through friction and vibration. When an object falls from a great height, gravitational potential energy is converted into kinetic energy.

When you hit something and stop falling, all the kinetic energy is converted into heat. When the light is turned on, potential energy travels through the wires and is converted into light and heat, which are forms of kinetic energy. The gravitational potential energy at large distances is directly proportional to mass and inversely proportional to the distance between them. The gravitational potential energy increases with the increase.

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The Deceleration required by the to avoid the pileup is 4.71m/s².

The car is travelling with a speed of 82 km/h. The driver starts to apply breaks at a distance of 55 m.

The minimum deceleration required to make the car stop to avoid a pileup is given by,

a = u²/2s

u is the initial velocity,

a is the negative acceleration,

s is the displacement of the car,

The speed is 82 km/h, converting it, the speed is 22.77m/s.

Putting values,

a = 22.77 x 22.77/2 x 55

a = 4.71m/s².

The negative acceleration or the deceleration required is 4.71m/s².

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During free fall, the motion is under gravity so the acceleration due to gravity is constant at 9.8m/s², and the speed is 29.4 m/s.

Freefall is described as a state of affairs while a frame is shifting handiest underneath the impact of the earth's gravity. in view that outside pressure is appearing at the ball, the motion may be extended. This free-fall acceleration is likewise known as acceleration because of gravity.

A motion under gravity refers to the movement of an object whose vertical movement is stricken by the presence of gravity. The pressure that draws gadgets downwards is GRAVITY. In fact, gravity works closer to the center of the Earth. Newton's regulation of universal gravitation is normally stated as that each particle attracts each other particle in the universe with a force that is proportional to the made from their hundreds and inversely proportional to the square of the gap among their facilities.

For speed:-

V = U  + at

    = 0 + 9.8 × 3

   = 29.4 m/s

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Answer:

Why is it important to explore our solar system? Space exploration allows us to prove or disprove scientific theories developed on Earth. Studying the solar system for example has brought us insights into such phenomena as gravity the magnetosphere the atmosphere fluid dynamics and the geological evolution of other planets.