The Sun and stars are light sources, and the planets are seen by reflected light. Explain how we can see the moons of Jupiter.

Answer:

180 miles/hr

Explanation:

15 min=1/4 hr

s= distance/time

s=45miles/1/4 hr

s=45miles x 4/1=180 miles/hr

Answer:

\(\huge\boxed{\sf V_i=60 \ m/s}\)

Explanation:

Final speed = \(V_f\) = 40 m/s

Time = t = 5 s

Acceleration = a = -4 m/s²

Initial velocity = \(V_i\) = ?

\(\displaystyle a = \frac{V_f-V_i}{t}\)

Put the givens in the above formula

\(\displaystyle -4=\frac{40 - V_i}{5} \\\\Multiply \ -5 \ to \ both \ sides\\\\-4 \times 5 = 40 - V_i\\\\-20 =40-V_i\\\\Subtract \ 40 \ to \ both \ sides\\\\-20-40=-V_i\\\\-60\ m/s=-V_i\\\\60 \ m/s = V_i\\\\V_i=60 \ m/s\\\\\rule[225]{225}{2}\)

Answer:

The coefficient of static friction between the ground and the soles of a runner’s shoes is 0.98. What is the maximum speed in which the runner can accelerate without slipping if they have a mass of 73 kg?

Explanation:

The required value of distance covered by the child during sliding is of 6.08 m.

Given data:

The mass of child is, m = 48 kg.

The coefficient of friction between the child and floor is, \(\mu = 0.51\).

The initial velocity of the child is, u = 7.8 m/s.

Applying the work-energy theorem, which says that the work done by the frictional force is equal to the kinetic energy change. Then,

\(W = \Delta KE \\\\f \times s = \dfrac{1}{2}mv^{2}- \dfrac{1}{2}mu^{2}\)

Here, f is the frictional force and s is the stopping distance.

Solving as,

\(-(\mu \times mg) \times s = \dfrac{1}{2}mv^{2}- \dfrac{1}{2}mu^{2}\\\\-\mu \times g \times s = \dfrac{1}{2}(0)^{2}- \dfrac{1}{2}u^{2}\\\\-0.51 \times 9.8 \times s = - \dfrac{1}{2} \times 7.8^{2}\\\\s = 6.08 \;\rm m\)

Thus, we can conclude that the required value of distance covered by the child during sliding is of 6.08 m.

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Heat the saucepan after the wine has been added. Growing molecular collisions that defeat the forces of intermolecular attraction. A portion of the wine starts to boil away almost instantly.

Example: The polar H2O molecules are drawn to the sodium and chloride ions in the beaker when NaCl and water are combined there. This interaction's potency is determined by: how big the dipole moment is.

What draws molecules together?

Polar molecules line up so that their positive ends interact with each other's negative ends. Unlike the atoms' covalent bonds in a molecule (intramolecular bonding)

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Answer:

Here's what I get  

Explanation:

When two waves meet, they interfere with each other.

1. Constructive interference

If the crests of the waves happen to line up, as in Fig. 1,  the amplitudes add up.

The crests become twice as high. The troughs also line up, so they become twice as deep.

We call this constructive interference.

2. Destructive interference

If the trough of one wave meets the crest of another, as in Fig. 2, the opposite happens.

The trough of one wave subtracts from the crest of the other, so the two waves cancel.

We call this effect destructive interference.

The direction of the force from wire 1 on wire 2 is attractive, as the two currents are in the same direction.

If two currents are flowing in the same direction and the forces between the wires are attractive, then the direction of the force on wire 2 due to wire 1 will be towards wire 1. This is because the magnetic field created by the current in wire 1 will induce a magnetic field in wire 2, and the interaction between these two magnetic fields will result in an attractive force between the wires.

In summary, if two currents are flowing in the same direction and the forces are attractive, the direction of the force on wire 2 due to wire 1 will be towards wire 1.

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Answer:

b. fission is a process in which a large nucleus is split into smaller nuclei.

Explanation:

The direction of the break dancer is always changing hence we can say that the break dancer is accelerating.

The term acceleration means change of velocity with time. It refers to the time taken for the velocity of a body to change in a specified direction. Recall that velocity takes direction into account.

The direction of the break dancer is always changing hence we can say that the break dancer is accelerating since his direction is changing even though the speed is constant.

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The output force on the piece of food the chopsticks pick up is mechanical advantage times 3 N.

The force amplified by utilising a tool, mechanical device, or machine system is known as mechanical advantage. To achieve the desired output force amplification, the gadget trades off input forces against movement.

Mathematically:

mechanical advantage = output force/input force

Given that input force = 3 N.

Hence, output force = mechanical advantage × 3 N.

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Answer:

Explanation:

a. From the information provided in the question, the blue liquid is a solution. This is because a solution is a type of homogeneous mixture (that has an evenly distributed solute in a solvent) which is the reason the liquid was said to be blue (and not immiscible blue solid in a liquid) but after been exposed to heat became just a blue solid. Typically, a solution has a solute and a solvent (combined), the solute here is the blue solid while the solvent is the liquid that made the combination a liquid.

b. Since the dish containing the liquid was placed on a windowsill, it can be assumed that the dish was subjected to heat from the sun which caused the liquid (in the solution) to evaporate after exposure to the heat from the sun (over the weekend) leaving the blue solid solute (of the solution) to remain in the dish. This can be referred to as evaporation to dryness in separation techniques (if the goal was to intentionally separate the solid solute from the liquid solvent).

Answer:

its c

Explanation:

The ball would curve down more sharply on Earth than on the moon.

The motion of the ball thrown forward is influenced by force of gravity. The force of gravity pulls the ball towards the center of the planet.

The motion of the ball on earth will be curved downwards due to the effect of gravity.

The motion of the ball on moon will be curved downward but less sharply due to lesser influence of gravity.

Thus, the ball would curve down more sharply on Earth than on the moon.

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a. True.

When salt is dissolved in water, it dissociates into its constituent ions, which can carry an electric current through the solution.

The positively charged sodium ions (Na+) and negatively charged chloride ions (Cl-) are attracted to the electrodes of an electric circuit, and when a potential difference is applied, they move towards their respective electrodes, carrying electric charge with them.

In contrast, pure water does not conduct electricity because it contains no free ions or electrons that can carry an electric current.

Pure salt (NaCl) is also a poor conductor of electricity because its constituent ions are held together by strong electrostatic forces and are not free to move.

Thus, the statement "When salt is dissolved in water, the resulting solution conducts electricity well" is true.

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Light acceleration is used to maintain slow forward motion or allow speed to increase gradually with minimum weight shift.

This is referred to the rate of change of velocity with time and  is regarded as a vector quantity.

It is also characterized by a positive forward motion and light acceleration on the other hand maintains slow forward motion or allow speed to increase gradually with minimum weight shift.

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Answer:

...............................

As the spaceship approaches and passes through the center of the asteroid ring, the gravitational force on the ship increases due to the reduced distance between them.

The gravitational force between two objects is dependent on their masses and the distance between them. When the spaceship is far away from the ring of asteroids, the gravitational force exerted by the ring on the ship is relatively weak due to the large distance between them. However, as the spaceship approaches the center of the ring, the distance between the ship and the asteroids in the ring decreases, resulting in an increase in the gravitational force. This increase in gravitational force is proportional to the decrease in distance between the two objects. As the spaceship continues to move towards the center of the ring, the gravitational force exerted by the ring on the ship will continue to increase until it reaches its maximum when the ship is at the center of the ring.

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Answer:

Explanat WRITE A ONE PAGE ESSAY TO EXPLAIN THE AUTHOR'S PURPOSE IN WRITING HOM SMART ARE ANIMAL

Answer: 5

We write the number 157,821 by moving the decimal place to the left

until the first number, taking note of the number of times you moved it.

Therefore, it is written as 1.57821 x 10^5. The power of 10 would be 5.

Answer:

C: Every mass exerts a gravitational force on every other mass

This statement is true

In a chemical reaction, activation energy increases the energy state of the reactants. This outcome causes the particles to collide with greater force and frequency, which results in the formation of new products.

Activation energy is the minimum amount of energy required for a chemical reaction to occur. In a chemical reaction, the reactants need to overcome a certain energy barrier before they can form products. This energy barrier is known as the activation energy. When the activation energy is high, it means that the reactants require more energy to overcome the energy barrier and form products.

This causes the particles to collide with greater force and frequency, resulting in a higher likelihood of successful collisions and the formation of new products. Therefore, activation energy plays a critical role in determining the rate of a chemical reaction and the amount of product that is formed.

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Find the gravitational force exerted by the sphere is r = a

Total gravitational Field at r=a

Total gravitational Field at r = a =Field due to solid sphere+ field due to spherical shell

we know gravitational field inside spherical shell is zero.

and gravitational field due to solid sphere inside = GMr/ R²

​

so here

Total gravitational Field= Field due to solid sphere+ field due to spherical shell

G = (Gm1a / R²1) + 0

Force exerted on particle  F = mG

F =  Gm1 ma / R²1

                  Gravity is a fundamental interaction in physics that causes mutual attraction between all things that have mass or energy. By far the weakest of the four fundamental interactions, gravity is approximately \(10^{38}\) times weaker than the strong interaction, \(10^{36}\) times weaker than the electromagnetic force, and \(10^{29}\) times weaker than the weak interaction.

          As a result, it has no effect at the level of subatomic particles. Gravity, on the other hand, is the most significant interaction between objects on the macroscopic scale, determining the motion of planets, stars, galaxies, and even light.

        Gravity gives physical objects weight on Earth, and the Moon's gravity is responsible for sublunar tides in the oceans. Gravity also serves many important biological functions, such as guiding plant growth via gravitropism and influencing fluid circulation in multicellular organisms.

             Gravity is responsible for many of the large-scale structures in the Universe because the gravitational attraction between the original gaseous matter in the Universe allowed it to coalesce and form stars, which eventually condensed into galaxies. Gravity has an infinite range, but its effects weaken as objects move further away.

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A baseball player launches a big home run to start the game. The ball leaves the bat with a speed of 40.0 m/s and an angle of 30.0° from the horizontal.

An item or particle that is propelled into a gravitational field, for example from the surface of the Earth, and moves across a curved route only under the influence of gravity is said to be experiencing projectile motion. Most calculations make the assumption that the effects of air resistance are passive and insignificant in the specific instance of Earth projectile motion. The curving path of objects in projectile motion was proved by Galileo to be a parabola, but it could also be a straight line in the specific situation when it is hurled directly upwards. One such trajectory is a ballistic trajectory, which is the study of such motions.

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Norepinephrine can be viewed as a Neurotransmitter or a chemical, contingent upon what discharges it and how far it should go to arrive at a receptor. It is true.

A neurotransmitter is the hormone norepinephrine, also known as noradrenaline. It is a chemical messenger that, as a neurotransmitter, aids in the transmission of nerve signals to another nerve cell, muscle cell, or gland cell across nerve endings.

A neurotransmitter is a molecule that a neuron secretes to influence another cell at a synapse. The cell that is receiving the signal—the target cell—could be a muscle or gland cell or another neuron.

Dopamine is the source of the neurotransmitter norepinephrine. Nerve cells in the brainstem and a region close to your spinal cord produce norepinephrine.

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The Big Bang Theory proposes that the universe began as a singularity, an infinitely small, dense and hot point, approximately 13.8 billion years ago.

The universe then rapidly expanded and cooled down, allowing particles to combine and form the first atoms, mostly hydrogen and helium.

The Big Bang Theory is supported by several observations, including the cosmic microwave background radiation, which is a remnant of the hot and dense early universe, and the observed abundance of light elements such as hydrogen and helium. It also explains the observed redshift of light from distant galaxies, which is consistent with the universe expanding from a single point.

The theory has been refined and expanded over time to incorporate new observations and discoveries, but the core idea of the universe starting from a singularity and expanding continues to be the most widely accepted explanation of the origin of the universe.

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Answer:

colder because of moisture

Answer:

NaOH

Explanation:

Given:

The mass on the table is,

The hanging mass is,

THe coefficient of friction is,

let the acceleration of the whole system is a (for the hanging mass it is downward and for the mass on the table it is rightward). the tension towards The fixed point of the pulley is T.

we can write,

Adding these equations we get,

Substituting the values we get,

Hence the acceleration is 6.66 m/s^2.

The average acceleration from 9 to 18 seconds is 6 meters per second.

The graph shows that from 9 to 18 seconds the speed of the ostrich stays at a steady 6 meters per second.

A nickel atom has an atomic number of 28 and an atomic mass of 59. It has a central nucleus composed of 28 protons and 31 neutrons, surrounded by an electron cloud containing 28 electrons.

The atom consists of matter that may be split without releasing electrical charges.

It's also the smallest unit of matter with chemical element features. As a result, the atom is the fundamental unit of science.

In the nucleus, proton and the neutron is existing. The condition of the atom to be electrically neutral is that the number of the proton and electron should be the same.

A nickel atom has an atomic number of 28 and an atomic mass of 59. In the nucleus, proton and the neutron is existing,the atom is the fundamental part of the particle.

In that, condition, It has a central nucleus composed of 28 protons and 31 neutrons, surrounded by an electron cloud containing 28 electrons.

Hence, option A is correct.

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