Which element is likely more reactive, and why?

Element 1 is more reactive because it has fewer electron shells and is toward the top of its group on the periodic table.
Element 1 is more reactive because it has more electrons in its valence shell and is farther to the right on the periodic table.
Element 2 is more reactive because it does not have a valence shell close to the nucleus, so it will attract electrons.
Element 2 is more reactive because it does not have a full valence shell, so it will attract electrons

Answer:

C voltage

Explanation:

Voltage is the change in electric potential so basically current flows from high potential to low potential due to voltage.

The weight of a \(45 kg\) box is \(441.45 N\).

Weight refers to the measure of the force exerted on an object due to the gravitational pull of the Earth.

Given the mass of the box is \(m=45 kg\).

The weight of an object (\(W\)) can be found by multiplying the mass of the object (\(m\)) by the acceleration due to gravity (\(g\)).

So, \(W=mg\).

It is known that acceleration due to gravity, \(g=9.81 m/s^2\).

Hence, the weight of the box, \(W=(45kg)\times (9.81 m/s^2)\).

\(\Rightarrow W=441.45 (kg\cdot m/s^2)\\\Rightarrow W=441.45 N\)

Therefore, the weight of the box is \(441.45 N\).

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Answer:

44.1 W

Explanation:

Power = Voltage x current

(P = VI)

P = 12.6 x 3.5

P = 44.1 W

Answer:

2

1

2

1

3

1

Explanation:

I'm pretty sure these are right. you might want to go back and check the first and third, but the other 4 are right

The greater mass will have greater acceleration is a fact from second law of motion. Thus, first situation is an example of second law. Spilling of water from the glass indicates the first law , that is law of inertia.

Newton' s first law of motion states that, every body tends to continue on the state of motion or rest until an external force acts upon it. This law is called law of inertia.

Second law states that the force applied on a body is directly proportional to the mass and acceleration.

Newton's third law states that, for every action there is an equal and opposite reaction. The first statement indicates the second law of motion and water spilling indicates the law of inertia.

As the mass increases, more force to be applied and acceleration decreases with mass. Thus third situation indicates second law. The magician pulling the cloth from stationary, hence it is first law.

A rocket launches by a force applied on the space and an opposing force from the fuel make it move indicating the third law. The last situation indicates the first law. Hence, the labeling is as 2,1,2,1,3,1.

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Answer:

juuhu

Explanation:

jjj

The acceleration of gravity on the surface of Mars's moon Phobos is 0.00717 m/s². A 70 kg person would weigh 91.0 N on Europa.

The acceleration of gravity on a planet or moon is calculated using the following formula:

g = G * M / R^2

where:

g is the acceleration of gravity (in m/s²)

G is the gravitational constant (6.674 × 10^-11 m³/kg s²)

M is the mass of the planet or moon (in kg)

R is the radius of the planet or moon (in m)

In this case, the mass of Phobos is 1.3 × 10¹⁶ kg and the radius of Phobos is 11 km. Substituting these values into the formula above, we get:

g = 6.674 × 10^-11 m³/kg s² * 1.3 × 10¹⁶ kg / (11 km)^2 = 0.00717 m/s²

Therefore, the acceleration of gravity on the surface of Phobos is 0.00717 m/s².

The weight of an object on a planet or moon is calculated using the following formula:

w = mg

where:

w is the weight of the object (in N)

m is the mass of the object (in kg)

g is the acceleration of gravity (in m/s²)

In this case, the mass of the person is 70 kg and the acceleration of gravity on Europa is 1.3 m/s². Substituting these values into the formula above, we get:

w = 70 kg * 1.3 m/s² = 91.0 N

Therefore, a 70 kg person would weigh 91.0 N on Europa.

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Answer:

convection: heat transfer by movement of currents inside a liquid, currents in the mantle, temp inside the house, red dye rises blue dye sinks,

radiation: heat from a bonfire, transfer of energy through space,

conduction: frying pan to cooking egg, candle heating up foil to chocolate chips

Explanation:

Answer:

The free-body diagram of the cannonball is found in the attachment below

Note The question is incomplete. The complete question is as follows:

A cannonball has just been shot out of a cannon aimed 45∘ above the horizontal rightward direction. Drag forces cannot be neglected.

Draw the free-body diagram of the cannonball.

Explanation:

Free-body diagrams are diagrams used to show the relative magnitude and direction of all forces acting upon an object in a given situation.

In order to construct free-body diagrams, it is important to know the various types of forces acting on the object in that situation. Then, the direction in which each of the forces is acting is determined. Finally the given object is drawn using any given representation, usually a box, and the direction of action of the forces are represented using arrows.

In the given situation of a cannonball which has just been shot out of a cannon aimed 45∘ above the horizontal rightward direction., the forces acting on it are:

F = force exerted by the cannon acting in the direction of angle of projection

Fdrag = drag force. The drag force acts in a direction opposite to the force exerted by the cannon

Fw = weight of the cannonball acting in a downward direction

The free body diagram is as shown in the attachment below.

The particle with a velocity of 4 m/s and with an acceleration 10 m/s2 in a sec will travel a distance of: 9 m

The formula for Uniformly varied rectilinear motion (UVRM) and procedure we will use to solve this exercise is:

x = (vi* t) + (a * t²)/2

Where:

Information about the problem:

Applying the distance formula, we have:

x = (vi* t) + (a * t²)/2

x = (4 m/s * 1 s) + (10 m/s² * (1 s)²)/2

x = 4 m + (10 m/s² * 1 s²)/2

x = 4 m + (10 m)/2

x = 4 m + 5 m

x = 9 m

It is a physical quantity that indicates the variation of velocity as a function of time, it is expressed in units of distance per time squared e.g.: m/sec2 ; km/h2

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ok? EXPLAIN PLS

Explanation:

Answer:

A

Explanation:

The wavelength is the spatial time of an occasional wave, the distance over which the wave's shape rehashes.

Hope this helped!!

Answer:

wavelength

Explanation:

If you look at the tip of a pencil ,0.553 m the distance of the image from the lens of your eye will be 0.024m.

The human eye has a focal length of about 22 mm, but this is deceiving because

(i)our eyes have curved backs,

(ii) our peripheral vision has gradually less detail than our central vision,  (iii) the scene we see is a combination of what our two eyes see.

Since the coronary muscles are flexible, they allow our lenses to alter in focus length in response to the amount of light entering our eyes. This characteristic of the eye is known accommodation.

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A light-year is the distance that light travels in a year and is approximately equal to 9.46 trillion kilometres or 5.88 trillion miles.

The distance travelled by light in one year (365 days). A light-year is a way to measure distance in space. The distance that light can travel in one year, which is approximately 5.88 trillion miles (9.46 trillion kilometres), is referred to as a light-year. The reason light-years are utilized as a measurement of distance in space is that distances in space are vast, making miles or kilometres inadequate.

The speed of light is approximately 186,000 miles per second (299,792 kilometres per second). When you multiply that by the number of seconds in a year (31,536,000), you get 5.88 trillion miles or 9.46 trillion kilometres. Therefore, the distance travelled by light in one year (365 days) is a light-year.

A leap year, which happens every four years, adds an extra day to the year, making it 366 days long. However, this does not have an impact on the definition of a light-year as a unit of distance, thus choice B is incorrect. C and D are incorrect because a light-year does not measure time but instead measures distance.

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Want to be friends?

Answer:

yes

Explanation:

velocity is vector though but speed is scalar

velocity requires direction

so velocity is literally speed with direction

In order to produce a longitudinal stadium wave, fans in a stadium must move in a coordinated manner. They should perform a forward and backward motion in their seats, while staying in place horizontally.

In order to produce a longitudinal stadium wave, fans in a stadium must move in a coordinated and synchronized manner. The wave typically starts with a small group of fans standing up and raising their hands, then quickly sitting down as the fans behind them do the same, creating a ripple effect throughout the entire stadium. This wave-like motion is created as each group of fans stands up and sits down in sequence, creating a wave that appears to travel across the stadium. It is important that fans move in a consistent and uniform manner for the wave to be successful and visually appealing. The key to creating a successful stadium wave is timing and coordination, as each fan must move in unison with the others around them.
This motion creates areas of high pressure (compression) and low pressure (rarefaction) that move through the crowd, resembling the movement of particles in a longitudinal wave. The fans' synchronized actions result in the wave-like appearance that travels through the stadium.

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Object appears 33% closer in water, this is due to the refractive index of water.

When a ray of light passes through an optically denser medium from an optically rarer medium, it gets bent towards the normal. This is called the refraction of light. This is due to the different speeds of light in different mediums of different optical densities.

Refractive index of a substance is the ratio of the speed of light in a vacuum to the speed of light in the substance. Mathematically

Refractive index = speed of light in vacuum/speed of light in substance

Refractive index of water is 1.33. It means the distance travelled by the light in a vacuum is 1.33 times more than that of in water.

So object appears (1.33d × 100)/d = 33% closer

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Answer:

114.29s

Explanation:

average speed = distance/Time

Given

speed = 7m/s

distance = 800m

Required

Time taken by the runner to complete the race

From the formula:

Time = Distance/speed

Time = 800/7

Time = 114.29seconds

Hence it took the runner 114.29s to complete the race

Answer:

V= 0.25L

Explanation:

The correct order of increasing impedance is:

C. PZT, gel, skin, matching layer

Impedance is a measure of the opposition to the flow of sound waves in a medium. It depends on the density and speed of sound in the material. In the given options, the order of increasing impedance can be determined by considering the properties of the materials involved.

PZT (lead zirconate titanate) has a higher impedance than gel, skin, and the matching layer. PZT is a piezoelectric material commonly used in ultrasound transducers and has a higher density and speed of sound, leading to higher impedance.

Gel has a lower impedance compared to PZT but higher impedance than skin and the matching layer. Gel is used as a coupling medium between the transducer and the skin to enhance acoustic coupling and minimize impedance mismatch.

Skin has a lower impedance than both gel and the matching layer. It is the outermost layer and acts as an interface between the transducer and the biological tissue.

The matching layer has the lowest impedance among the given options. It is designed to match the impedance of the PZT to the impedance of the tissue being imaged, facilitating efficient sound transmission.

Therefore, the correct order is C.

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Explanation:

We Know That

POTENTIAL ENERGY= MASS*g*HEIGHT

When the objects are lifted to same height then the object with heavier mass would have the highest potential energy

.

When you turn off pressure and turn on acceleration, you will notice that the focus shifts from the force exerted on an object to the rate of change in its velocity.

When the pressure is turned off and the acceleration is turned on, there will be a change in the movement of the object. Instead of the object being pushed or held in place by the pressure, it will now be moving in the direction of the acceleration.

                                        This can be observed by changes in the velocity, position, and direction of the object. Additionally, the amount of force required to move the object may also change, depending on the magnitude of the acceleration.
                                           when you turn off pressure and turn on acceleration, you will notice that the focus shifts from the force exerted on an object to the rate of change in its velocity. The acceleration provides information about how quickly an object is speeding up or slowing down, rather than the force applied to it.

In summary, turning off pressure and turning on acceleration changes the perspective from force to the rate of change in velocity.

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The principle behind the generation of electricity is that when a conductor passes or is passed by a magnetic field, a current is produced (induced) in the conductor. This principle is known as electromagnetic induction.

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Answer:

yes it does exert a force, it pushes it up

Explanation:

this is called normal force

if it didn't exert a force the book would keep going down

according to newton every force has an equal amd opposite reaction

so the book exerts a force on the table and vice versa

hope this helped

The displacement due to the constant speed and the displacement due to the deceleration gives a total displacement of 238.5 mi.

Displacement is the measurement of how far an object has moved from its initial position. It is commonly expressed in terms of distance and direction, and is often measured in terms of meters or kilometers. Displacement is a vector quantity, meaning it has both magnitude and direction.

The total displacement of the jetliner between touchdown and coming to rest can be calculated by adding the displacement due to the constant speed for 1.1 seconds and the displacement due to the deceleration over the same time period.

The displacement due to the constant speed of 143 mi/h for 1.1 s is found by multiplying the speed (143 mi/h) by the time (1.1 s) to get 159.3 mi.
The displacement due to the deceleration is found by calculating the average speed of the jetliner between touchdown and coming to rest, then multiplying this average speed by the time (1.1 s). The average speed of the jetliner is found by taking the difference between its initial speed (143 mi/h) and its final speed (0 mi/h) and dividing it by 2. This gives an average speed of 71.5 mi/h. Multiplying this average speed by the time (1.1 s) gives a displacement due to deceleration of 79.2 mi.
Adding the displacement due to the constant speed and the displacement due to the deceleration gives a total displacement of 238.5 mi.

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Answer:

Spherical mirror is a mirror with a curved reflecting surface.

There are two spherical mirrors -

Concave Mirror - A spherical mirror , whose reflecting surface is curved inwards , that is , faces towards the centre of the sphere , is called concave mirror.

Cnovex Mirror - A spherical mirror whose reflecting surface is cirved outwards is called convex mirror.

Explanation:

Points of difference :

Answer:Explanation:

Protons and neutrons have very similar mass, while electrons are far lighter, approximately 11800 times the mass. Protons are positively charged, neutrons have no electric charge, electrons are negatively charged. The size of the charges is the same, the sign is opposite.

Explanation:

speed = 50 km/h

time = 0.75 hr

dist. = time × speed

dist. = 0.75 × 50

dist.= 37.5 km

Answer:

37.5 km

Explanation:

The course of action that has the highest EMV for the accompanying tree diagram is action B.

The total EMV resulting in each action is calculated by using the values given in the tree diagram as follows;

The total EMV resulting in action A is as follows;

EMV = 0 + 60 + 90 + 40 + 44 + 60

EMV = 294

The total EMV resulting in action B  is as follows;

EMV = 45 + 45 + 99 + 40 + 50 + 30 + 40 + 50

EMV = 399

Thus, from the values obtained in the calculations above, we can conclude that the course of action that has the highest EMV for the accompanying tree diagram is action B.

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