Astronauts appear weightless while working in the International Space Station because
A) they are in a state of free fall.
B) there isn't any gravity in outer space.
C) they have very little mass when in outer space.
Eliminate
D) they have gravitational attractions to the sun and moon

An object which starts from its resting place & accelerates at a speed of 4 rad/sec², the angular displacement is 8 rad.

An object's angular displacement is described in the following:

Angle displacement is equal to θ\(f\)-θ\(i\).

The following methodology must also be applied to determine angular displacement when the object's acceleration, starting velocity, and time are known:

θ=ωt+ 1/2αt²

[where θ= the angular displacement of an object,

ω= initial angular velocity,

α= angular acceleration,

t= time]

In this case, the object starts from the rest position.

So, the initial angular speed, ω= 0 rad/sec

Provided angular acceleration ,α = 4 rad/sec²

Time ,t= 4 sec

So, θ= \(0*4+ (1/2)*4*4\)

⇒θ= 0+ 8

⇒θ= 8 rad

Therefore, it is concluded that the angular displacement is 8 rad.

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explanation

the general form of wave equation is

       y=Asin(kx-wt)

we have

      y=5sin(3x-4t)

hence the angular frequency

     w= 4s^-1

the frequency

  f=w/2 pi

  f=4/2 pi

  f=4/2*3.14

  f=0.64 hz

the period

T=1/f

T=1/0.64

T=1.5625=1.6

the wavelength

k=2 pi/lambda

lambda=2 pi/k

k=3

so

lambda=2*3.14/3

lambda=2.09

if my answer is right then mark me brainlist

To calculate the sum of squares (SS), variance, and standard deviation for a population of n=6 scores: 1, 6, 10, 9, 4, 6, we will use the computational formula.

1. Calculate the mean (μ) of the scores:
  Add up all the scores and divide by the total number of scores: (1+6+10+9+4+6)/6 = 36/6 = 6.

2. Calculate the sum of squares (SS):
  Subtract the mean from each score and square the result. Then, add up all the squared differences.
  (1-6)^2 + (6-6)^2 + (10-6)^2 + (9-6)^2 + (4-6)^2 + (6-6)^2 = 25 + 0 + 16 + 9 + 4 + 0 = 54.

3. Calculate the variance (σ^2):
  Divide the sum of squares by the total number of scores.
  54/6 = 9.

4. Calculate the standard deviation (σ):
  Take the square root of the variance.
  √9 = 3.

So, the sum of squares (SS) is 54, the variance (σ^2) is 9, and the standard deviation (σ) is 3 for the given population of scores.

The sum of squares (SS) measures the dispersion of the scores around the mean. Variance (σ^2) represents the average of the squared differences from the mean. The standard deviation (σ) indicates the average deviation of scores from the mean.

It is important to note that the calculations assume that the given scores represent the entire population, not just a sample.

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The cooling system must remove 240 kJ of heat energy.

The first law of thermodynamics, also known as the law of conservation of energy, states that energy cannot be created or destroyed, only transferred or converted from one form to another.

Therefore, in this scenario, the total amount of energy that enters the machine must be equal to the total amount of energy that leaves the machine.

The amount of heat energy that enters the machine is 1000 kJ, and the amount of work energy that is produced by the machine is 760 kJ. Therefore, the amount of heat energy that must be removed by the cooling system is:

Total heat energy entering the machine - work energy produced by the machine = heat energy removed by cooling system

1000 kJ - 760 kJ = 240 kJ

Thus, the cooling system must remove 240 kJ of heat energy to maintain the constant temperature of the machine. This is essential in order to prevent the machine from overheating and prolong its usage, as well as to ensure that it is functioning efficiently.

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Answer:

The new charge is +2

Explanation:

Sodium atom has 11 electrons (2, 8, 1)

sodium ion is cation and it will have 10 electrons after losing 1 electron (Na⁺), the charge is +1 because it needs to lose 1 electron to attain octet structure and become stable.

When this sodium ion loses 1 more electron, the new charge will be Na²⁺.

Thus, the new charge will be  +2

Shawn's speed relative to Susan's reference frame is approximately 21.33 mph.

To determine Shawn's speed relative to Susan's reference frame, we can use the concept of vector addition. Since they are moving in different directions, their velocities can be treated as vectors.

Let's consider Susan's reference frame as the stationary frame of reference. In this frame, Susan's velocity is 0 mph because she is not moving relative to herself. Therefore, we can calculate Shawn's velocity relative to Susan by considering their relative velocity.

Using vector addition, we can find the relative velocity by subtracting Susan's velocity vector from Shawn's velocity vector. Since Susan is driving north, her velocity vector would point upwards, while Shawn is driving east, so his velocity vector would point to the right.

The magnitude of Shawn's velocity relative to Susan's reference frame can be calculated using the Pythagorean theorem:

Relative speed = \(\sqrt{(Shawn's velocity)^2 - (Susan's velocity)^2}\)

Given:

Susan's velocity = 59 mph (north)

Shawn's velocity = 55 mph (east)

Relative speed = \(\sqrt{(55 mph)^2 - (59 mph)^2}\)

= \(\sqrt{3025 mph^2 - 3481 mph^2}\)

= \(\sqrt{(-455) mph^2}\)

≈ 21.33 mph

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Answer:

technically nfrbhrbbrbbf but also the skier can hurt himself if he speeds up

Explanation:

need points so plz like it

Answer:

Lenght= 12.92cm

Width= 52cm

Answer:

a = 5

Explanation:

F = M × A

15 = 3 × a

a = 15 / 3

a = 5

This is only if the toy can is pushing the book or smth coz the question looks incomplete...?

Answer:

5 m/s^2

Explanation:

Realize that Newton's Second Law explains that the net force is equal to the mass mulitplied by the acceleration, or in simple terms, F=ma. In the problem, the force is 15 newtons, and the mass is 3 kg. Substiting and dividing, we get 5 m/s^2 (5 meters per second squared).

Answer:

a. heat your telescope, so its delicate optics are not cold

Explanation:

If star is just born and giving off  faint radiation in infrared. These radiation would be long range infra red radiation as the star is just born having less surface temperature.

In order to locate the star through telescope, it must be positioned at higher altitudes so that water vapor is minimum. The radiation from other heating objects might alter the light coming through the cosmos. Therefore, it is mandatory to shield the telescope from foreign radiations.

For the same reason mentioned above the telescope must have cold surroundings. Moreover, optics of the telescope must also be kept free from dust and dirt for clear vision.

However, Heating of telescope in order to safe optics from cold must not be done. This would change the wavelength of long range infra red radiations from star and hence, its location.

The cell potential for the given reaction is +0.066V.

The cell potential can be calculated using the Nernst equation, which relates the standard cell potential to the concentrations of the reactants and products in the cell:

where Ecell is the cell potential, E°cell is the standard cell potential, R is the gas constant, T is the temperature, n is the number of electrons transferred in the reaction, F is the Faraday constant, and Q is the reaction quotient.

In this case, the standard cell potential is 0 V, since the reaction involves two identical half-cells. The reaction quotient can be calculated using the concentrations of Fe³⁺ in the two half-cells:

Plugging in the values and solving for Ecell gives:

Therefore, the cell potential for the given reaction is +0.066V.

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Answer:

1.5 A

Explanation:

Applying

V = IR'....................... Equation 1

make I the subject of the equation

I = V/R'.................. Equation 2

Where V = Voltage, I = current, R' = Total resistance.

From the question,

In a series connection,

R' = 0.2+0.3+0.5+5 = 6 ohm.

Given: V = 9V

Substitute into equation 2

I = 9/6

I = 1.5 A.

Note: Since all the resistors are connected in series, thesame current flows through them

Therefore the current flowing through the 5 ohm resistor = 1.5 A

Answer:

Energy is a property that matter has. The same amount matter can have different amounts of energy and so represent different states of matter. For example, if you add energy to an ice cube made of water, it becomes liquid water, and if you add even more energy, it becomes steam.

Explanation: Look At Answer

Answer:

Elements that are noble gases are helium, argon, xenon, krypton, neon and radon.

Explanation:

the answerer is visible

Genetic material is known to absorb UV light. Given what we know, we can confirm that genetic material is not known to absorb light originating from an infrared or microwave radio source.

Genetic material is the hereditary substance in the cell. It carries all information specific to an organism. It is known as DNA (deoxyribonucleic acid) or RNA (ribonucleic acid)

UV light is electromagnetic radiation, and the primary source of UV light that we are exposed to is the sun.

Therefore, given that the only form of light listed that genetic material is known to absorb is that of Ultraviolet or UV light, we can confirm that the answer to the question proposed is infrared and microwave radio light.

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Answer:

76 N north-east

Explanation:

V = √(44²+62²) = 76 N

Answer:

1. less. 2 greater. 3. the same. 8. An FM radio station broadcasts its signal at a fre​- ... wave 3. | 3x108 = 269.15x107). = 3.20m. 2. An electromagnetic AM-band radio wave could have Base your answers to questions 9 and 10 on the informa- ... X rays. -Microwaves. -Long

Final equation for  stopping potential is V = (6.626 x 10^-34 J·s * 3 x 10^8 m/s) / (1.4 x 10^-7 m) - (2.3 eV / 1.6 x 10^-19 eV). The kinetic energy in electron volts (eV) of the most energetic electrons ejected is  KE = qV. The speeds of the electrons is   KE = (1/2)mv^2.

To find the stopping potential, kinetic energy, and speed of the ejected electrons, we can use the following equations:

a) The stopping potential (V) can be calculated using the equation:

  V = hc/λ - Φ

  where:

  - h is Planck's constant (6.626 x 10^-34 J·s or 4.135 x 10^-15 eV·s)

  - c is the speed of light (3 x 10^8 m/s)

  - λ is the wavelength of light (in meters)

  - Φ is the work function (in electron volts, eV)

  First, let's convert the given wavelength to meters:

  140 nm = 140 x 10^-9 m = 1.4 x 10^-7 m

  Plugging in the values, we have:

  V = (6.626 x 10^-34 J·s * 3 x 10^8 m/s) / (1.4 x 10^-7 m) - 2.3 eV

  Note: We need to convert Joules to electron volts by dividing by the elementary charge (e = 1.6 x 10^-19 C).

  1 J = 1.6 x 10^-19 eV

  V = (6.626 x 10^-34 J·s * 3 x 10^8 m/s) / (1.4 x 10^-7 m) - (2.3 eV / 1.6 x 10^-19 eV)

  Calculating this equation will give you the stopping potential in volts.

b) The kinetic energy (KE) of the most energetic electrons ejected can be calculated using the equation:

  KE = qV

  where:

  - q is the elementary charge (1.6 x 10^-19 C)

  - V is the stopping potential (in volts, obtained from part a)

  Plug in the values and calculate the equation to obtain the kinetic energy in electron volts (eV).

c) The speed (v) of the electrons can be determined using the equation:

  KE = (1/2)mv^2

  where:

  - KE is the kinetic energy (in joules, obtained from part b)

  - m is the mass of an electron (9.11 x 10^-31 kg)

  Solve the equation to find the speed of the electrons.

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Answer:

The Answer To This Question Is B

Explanation: Please Mark Brainliest!

The speed of the ball seven seconds later is 28.6 m/s.

We have the following information;

initial velocity of the ball = 40 m/s

time taken = 7 seconds

Acceleration of the ball = 9.8 m/s^2

Now;

v = u - gt (the ball is moving upwards)

v = 40 - (9.8 * 7)

v = 28.6 m/s

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Answer:

Possiable answer by edge:

The shape of a river’s stream bed affects the speed and eroding power of a river by influencing the amount of friction between the water flowing through the river and the stream bed below. Friction is the force that opposes the motion of one surface as it moves across another surface. In a river, there is friction between the flowing water and the stream bed beneath it. Where a river is deep, less water comes into contact with the stream bed, so there is less friction. The reduced friction means there is less opposition to the water’s motion, so the river flows at a greater speed and has more kinetic energy for erosion. On the other hand, where a river is shallow, more water comes into contact with the stream bed, so there is more friction. The increased friction means there is more opposition to the water’s motion, so the river flows at a lesser speed and has less kinetic energy for erosion. Also, the roughness of a stream bed covered with boulders and other obstacles causes the water to flow through the river in a turbulent fashion. This could cause the river to move slower in some cases or erode more in other cases.

Explanation:

summary of answer:

influencing the amount of friction between the water flowing through the river and the stream bed below.

Answer:

6.25 m/s

Explanation:

The average speed of an object is the ratio of the total distance traveled by the object and the total time taken to cover the distance. Mathematically,

Average speed = total distance traveled/total time taken.

In this case;

Total distance traveled = 650 + 850 = 1500 m

Total time = 240 s

Average speed = 1500/240 = 6.25 m/s

The average speed of the man is, therefore, 6.25 m/s.

Answer:

the answer is B

Explanation:

edg 2020

Explanation:

(taking g = 10 m/s^2)

F - W = m * a

500 - 310 = 31 * a

190 = 31 * a

a (Acceleration of rock ) = 6.12 m/s^2

If a system has 46.5 j of heat added to it, and the system does 75.5 j of work on its surroundings. 29 j is the change in the internal energy of the system.

Internal energy refers to the energy that exists within the system. It is represented by the letter "U" in English.

Thermal energy is another name for internal energy. It is the energy of a substance as a result of the kinetic and potential energies connected to the ad hoc motion of all the constituent particles.

Internal energy, which is measured in KJ or Joule, is the energy attributed to the chaotic arrangement or random motion of particles within the system. Using the formula for internal energy, we can calculate the same.

The difference between the heat flow in a system and the work done by or on the system (PV) equals the change in internal energy, and the change in internal energy formula aids in calculating the same.

Energy Equation within the energy of the universe is constant, in accordance with the basic law of thermodynamics.

Additionally, the sum of the work done and the heat transported is equal to the change in a system's internal energy.

Additionally, the sum of the change in the system's internal energy and the work performed by the PV system equals the heat added or flown.

The Change in Internal Energy Formula is:

                    ΔU  =  Q  +  W

Here,

U =  the total change in internal energy within the system

Q =  the heat exchanged between a system and its surroundings (outside the system)

W  =  work done by or on the system

                 =  46.5 - 75.5

                 = 29j

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The voltage expression for vy in the given RC op amp circuit with a stepped voltage can be obtained by considering the time constant. If the time constant is 4-8, and the expression for the voltage across the resistor R is 8 mF, where T is in ms, the expression for vy can be derived.

In the given RC op amp circuit, the voltage across the resistor R is given by the expression vy = vis * (1 - e^(-t/RC)), where vis is the input voltage, t is the time, R is the resistance, and C is the capacitance.

Given that the time constant is 4-8, we can assume that the product of R and C is equal to this time constant. Let's assume RC = τ, where τ lies between 4 and 8.

Substituting RC = τ and the given expression for vis as 8 mF (where T is in ms), we can write the voltage expression as vy = 8 * (1 - e^(-t/τ)).

This expression represents the voltage across the resistor R, labeled as vy in the op amp circuit, as a function of time and the time constant τ.

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Answer:

Explanation. analysis, inference, and evaluation.help you to solve your problem as well as by using it you can develop scientific and critical thinking skills among students

Answer:

i dont know

Explanation:

Sorry and good luck

The pressure at the bottom of a body of water is the weight of water per one-meter square area.

The force applied perpendicularly to an object's surface per unit area across which that force is dispersed is known as the pressure. The definition of it is force per unit area. It is usually more convenient to use pressure rather than force to describe the influences upon the behaviour of fluid. various units are used to express pressure.

In a column of fluid, pressure increases with depth as a result of the weight of the overlying fluid. As a result, the bottom of a fluid column suffers more pressure than the top, as does an object submerged in the column.

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Answer:

Inertia

Explanation:

Part of Newton's Laws of Motion

Two particles moving away from an observer in opposite directions at the speed of light are not traveling at twice the speed of light.

The speed of light, symbolized by c, is a constant of nature that is defined as the distance light travels in a vacuum during one second (299,792,458 meters, or about 186,282 miles per second).

The speed of light is constant, and nothing can travel faster than it.

It is the maximum speed at which energy, matter, or information can travel in a vacuum without violating the laws of physics.

According to Albert Einstein's theory of relativity, nothing can travel faster than the speed of light, so no matter how fast something is moving away from an observer, it cannot exceed the speed of light.

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