Find the x and y-components of the vector vector a =(15 m/s^ 2, 39 left of -y axis)

If a ball is thrown horizontally from the top of a building 130 m high, then the velocity of the ball when it hit the ground would be 50.50 m/s.

Mechanical energy is the combination of all the energy in motion represented by total kinetic energy and the total potential energy stored energy in the system which is represented by total potential energy.

As given in the problem a ball is thrown horizontally from the top of a building 130 m high. The ball strikes the ground 74 m horizontally from the point of release,

v = √(2 × g × h)

By substituting the respective values of the height and gravity

v = √(2×9.81×130)

v =50.50 m/s

Thus, the velocity of the ball when it hit the ground would be 50.50 m/s.

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Maximum heigh: 1.496 m

(This number is not exacte I truncated it)

Explanation:

Data:

mass : m = 0.003 kg

spring constant : k = 220 N/m

amount of compression: x = 2 cm = 0.02 m

heigh : h = ?

accelaratiom due to gravity : g = 9.8ms^-2

Potential Energy : PE = ?

Since you'll be converting the PE to KE, you'll use 2 formulas.

Formulas:

Solution:

Hi.
It must be 4"5 because I had stated and erconsided to be the ultimate eeee

Object has a gravitational potential energy= 220J and height =8m, then the

mass of the object = 2.81kg

Energy acquired by an object due to the change in its position when it is present in a gravitational field is called gravitational potential energy. It can be also be said that gravitational potential energy is an energy that is related to gravity. Gravitational potential energy is stored in gravity batteries by lifting a mass to some particular height using a pump or motor. After the mass is lifted, it then stores gravitational potential energy depending on the mass of the object and also the height.

As given gravitational potential energy = 220 J

height = 8m

As we know that,

potential energy= mass* gravity* height

Therefore,

mass= potential energy/( gravity * height)

=220/(9.8 * 8)

mass = 2.81 Kg

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a) v = 9.8 m/s is his velocity just before his feet strike the ground.

b) When he slows down, his legs apply an average force of 3430 N to his torso.

Therefore, deceleration is defined as a reduction in speed as the body moves away from the beginning location. The opposite of acceleration is deceleration.

Given parameters;

Height of the tower , h = 5.0m

Distance of deceleration, d = 0.70m

Mass of the tensor, m = 50 kg

Final speed of the person calculated as:

1/2mv² = mgh

v² = 2gh

v = [tex]\sqrt{2gh}[/tex]

v = [tex]\sqrt{2*9.8*5}[/tex]

v = 9.8 m/s.

The torso's deceleration over the specified distance is

v² = u²+2as

a = v²-u²/2s

a = 0-  9.8²/2*0.7

a = 68.6m/s²

The average amount of force his legs apply to his body as he slows down is:

F = ma

F = 50× 68.6

F = 3430 N.

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In empty space, the quantity is always larger for x-ray radiation than for a radio wave is frequency.

X-rays are an electromagnetic radiation type that resembles visible light. However, x-rays have a higher energy than light and can penetrate most solid materials, including the human body. Images of the tissues and structures inside the body are created using medical x-rays.

The radiation you receive during an X-ray typically equals between a few days and a few years of exposure to naturally occurring radiation from the environment. The danger of developing cancer many years or decades after being exposed to X-rays exists, but it is regarded to be very low.

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By considering the horizontal component of the motion, the speed at which the crate was pushed is 13.1 m/s. Also, by considering the vertical component of the motion, the speed at which it hits the ground is 56 m/s

Motion of any object under gravity is the vertical motion of the object moving under the influence of acceleration due to gravity.

Given that a crate is pushed off the edge of a building which is 160 m tall. The crate lands 35 m from the base of the building.

a) how fast was the crate pushed can be known with the use of the formula R = ut

Where

From the vertical perspective, h = ut + 1/2gt²

where u = 0 and h = 35 m

35 = 1/2 × 9.8 × t²

35 = 4.9t²

t² = 35/4.9

t² = 7.14

t = √7.14

t = 2.67 s

Substitute t and R into the formula R = ut to get u

35 = 2.67u

u = 35/2.67

u = 13.1 m/s

b) how fast will it be moving when it hits the ground can be known by using the formula

v² = u² + 2gH

v² = 0 + 2 × 9.8 × 160

v² = 3136

v = √3136

v = 56 m/s

Therefore, the crate was pushed as fast as 13.1 m/s and it was moving as fast as 56 m/s when it hits the ground.

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Their common velocity is 5m/s.

Given information,

Mass of ball 1 [m1] = 15 kg

Mass of ball 2 [m2] = 15 kg

Velocity of ball 1 [v1] = 10 m/s

Velocity of ball 2 [v2] = 0 m/s

Since, both the balls move off together they have a common velocity.

Let common velocity be v.

Using conservation of momentum, that is

Initial momentum = Final momentum

m1 x v1 + m2 x v1 = [m1 + m2] x v

15 x 10 + 15 x 0 = [15 + 15] x v

150 + 0 = 30v

150 = 30v

v = 5m/s.

∴ Their common velocity is 5m/s.

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Answer:

1.56 s

Explanation:

d = 1/2 a t^2      d = distance = 12 m    a = 9.81 m/s^2

12 = 1/2 ( 9.81) t^2     shows t = 1.56 s

a. The quantity of energy lost or gained during a reaction is equal to its enthalpy change. Exothermic reactions in which hear is produced include the reactions of magnesium and hydrochloric acid.

Mg + 2HCl ---> MgCl2 + H2 + heat

b. The reactivity of sodium is higher than magnesium

Your information is incomplete but the complete question is written below.

Enthalpy change is the quantity of heat evolved or absorbed in a reaction under constant pressure.

The difference between total reactant and total product molar enthalpies estimated for substances in their standard states is the standard enthalpy of reaction for a chemical process.

If the magnesium sample was contaminated with an identical weight of MgCl2, the amount of magnesium is less than required, resulting in less heat evolved during the duration of the reaction and a drop in enthalpy change.

Sodium has a higher reactivity than magnesium. As a result, if magnesium is substituted with an equal amount of sodium, the rate of reaction increases and hence more energy is produced. As a result, enthalpy rises.

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1(a).Suppose your sample of magnesium was contaminated with an equal weight of MgCl2. How would the contamination affect the change in enthalpy for the Mg–HCl reaction? Justify your answer.

1(b) Suppose you replaced the magnesium in Part B with an equal weight of sodium. How would this substitution affect the enthalpy of the reaction calculated in the experiment? Be specific and justify your answer.

C2H2O+4O2 → 3CO2 + 3H2O shows a combustion reaction.

Combustion reaction is chemical reaction of substances including oxygen and accompanied by the generation of heat and light. Lighted match is an example of a combustion reaction. Combustion reaction takes place in the presence of oxygen as a reactant and products given are carbon dioxide, water and heat.

Combustion is an exothermic reaction which means that energy is released. Heat and light are released in a combustion reaction. During exothermic reactions, bonds are broken, which allows the energy stored in the bonds to be released and perform work. Exothermic reactions are chemical reactions that produce heat in the product. We say that the heat flow q is negative when heat flows from the system to the surrounding. Thereby, exothermic reactions have negative ΔH of the reaction.

Types of combustion are:

Rapid Combustion, Spontaneous Combustion and Explosive Combustion.

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Option B- the inner solar system was hotter than the outer solar system is the correct answer.

The Sun and the planets formed together 4.6 billion years ago from a cloud of dust particles and gas known as the Big bang. The universe continued to decrease in density and temperature. The energy of each particle was going down.

The terrestrial planets formed near the Sun, where temperatures were best for rocks and metals to condense. The jovian planets formed outside is called the frost line, where temperatures were low for ice condensation.

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Yes, because from the perspective of Earth, the planet appears to move in front of the star.

What do you understand by the term transit observation?

When a planet passes in front of an observer and a star, it is said to be transiting. When Venus or Mercury pass in front of Earth and the Sun, transits inside our solar system can be seen from the planet.

Therefore, Earth would  be a good candidate for a transit observation as from the perspective of Earth, the planet appears to move in front of the star.

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Answer:

D

Explanation:

self-explanatory:

higher temperature increases rate of dissolving

smaller particles means a larger surface area,therefore increasing rate of dissolving as more of the solute is in contact with the solvent at one time.

The airship’s velocity with respect to Earth is -60.1°  west of north.

Velocity is the speed at which something moves in a particular direction.

Vaw = 55.0 km/h, north

Vwe = 40.0 km/h at 17.0°

north of west,

Vae = Vaw + Vwe

Vx, ae = Vx, aw + Vx, we = Vwe (cos θwe)

Vy, ae = Vy, aw + Vy, we = Vaw + Vwe(sin θwe)

θwe = 180.0° − 17.0° = 163.0°

Vx, ae = (40.0 km/h)(cos 163.0°) = −38.3 km/h

Vy, ae = 55.0 km/h + (40.0 km/h)(sin 163.0°) = 55.0 km/h + 11.7 km/h

          =  66.7 km/h

Vae = √(Vx, ae)²+(Vy, ae0)²

       = √(−38.3km/h)²+(66.7km/h)²

       = √ 1. 47×10³ + 4.45×10³

       = 5. 92×10³km²/h²

       = 76.9 Km/ hr.

θ = tan⁻¹ ( Vy,ae / Vx, ae)

θ = tan⁻¹ ( 66.7 / -38.3 )

θ = −60.1°  west of north

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An example of a project where an object with a high (k) value would be a benefit is one that has to do with the design of a rocket engine. Metals that have very high thermal conductivity are useful for building rocket engines. This is because of the amount of energy/heat that is required to be combusted by these parts to achieve a break from the earth's force field of gravity.

While engineering problems where having an object with a low (k) value would be a benefit is those that have to do with buildings. Buildings are made from concrete and brisk with have low thermal conductivity hence low

A k-value (also known as a k-factor or lambda value) is a measure of a material's thermal conductivity, or how quickly heat moves through it. It is a basic quality that is independent of material quantities.

Thermal conductivities of different building materials may be compared using k-values. This is often useful in determining the possibility of heat transmission between the inside and exterior of a structure.

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Heightpeak = 12 * (vtakeoff^2 / 9.81) Using the above calculation and takeoff velocity, we can then calculate an individual's true vertical jump height. The Law of The Conservation of Energy states that "the total mechanical energy in a system remains constant."

take off velocity = [tex]\sqrt{21.56}[/tex] =4.64 m/s .

V^2 = 2 x h x 9.8

 = 2 x 1.1 x 9.8 =21.56

take off velocity = [tex]\sqrt{21.56}[/tex] =4.64 m/s

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In getting your reflexes tested at the doctor’s office, your leg moves less and less each time the doctor hits your kneecap with the reflex hammer, this an example of  A. observational Learning

The patellar reflex, commonly referred to as the knee reflex, is a straightforward reaction that causes the quadriceps muscle to contract when the patellar tendon is stretched.

Therefore, the process of learning through seeing other people's activities is known as observational learning. The desired behavior is observed, remembered, and imitated. As youngsters mimic the actions of adults, they engage in observational learning, sometimes referred to as shaping and modeling.

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See full question below

While getting your reflexes tested at the doctor’s office, your leg moves less and less each time the doctor hits your kneecap with the reflex hammer. What is this an example of?

A. observational Learning

B. sensitization

C. Habituation

D. Associative Learning

The converted unit from mile per hour to feet per second is 71.87 ft/s.

We need to know about unit conversion to solve this problem. The unit conversion can be used to convert a unit to another unit. It can be defined as

a = xb

where a is unit a, b is unit b and x is the constant of conversion.

From the question above, we know that

v = 49 miles/hour

1 mile = 5280 ft

By substituting the given parameters, the converted unit is

v = 49 miles/hour

v = 49 x (5280 ft) / (3600 s)

v = 49 x 1.47 ft/s

v = 71.87 ft/s

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An object with a mass of 1298 kg is accelerating at a rate of 17 m/s² when a net force is applied to it is 22066 Newton.

A force in physics is an effect that has the power to alter an object's motion. An object with mass can change its velocity, or accelerate, as a result of a force. An obvious way to describe force is as a push or a pull. A force is a vector quantity since it has both magnitude and direction.

Given that in the question an object with a mass of 1298 kg is accelerating at a rate of 17 m/s² when a net force is applied to it. The magnitude of the net force that is acting on the object is,

F = ma

F = 1298.17

F =  22066 Newton

The magnitude of the net force that is acting on the object 22066 N.

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Braking distance - It will take approximately 133 feet for a vehicle to stop on a dry surface when driving at a speed of 60 mph.

What is braking distance?

When you apply the brakes, your car will move this far before coming to a complete stop. As you increase your speed, the braking distance for the same car in the same circumstances will grow. The Highway Code provides typical braking distances for various speeds because of this. The published road brake pedal performance tests for almost all current production vehicles show braking distances from 60 mph that really are typically 120 to 140 feet, just under half of the anticipated safety distances.

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Static Friction is the force that holds the object in the place.

Static friction is the type of friction which acts on body and keep them at rest. Static friction opposes the relative motion  and keep the object in a place. It acts tangentially to the surface.The friction forces are of two types, kinetic and static. Static keeps the object at rest and kinetic allows the object to move. Friction plays a major role in our day to day life, we can walk properly without sleeping because of friction only. Due to friction we can slide heavy objects easily on the floor. There are liquids and surfaces which increase or decrease friction according to our needs and are used by factories and companies to make their work easy. To know more about friction visit

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The following would be observed Time would run faster on Earth due to the increased gravity field. Option A.

If the second moon's gravitational influence is extreme it can produce tremendous flood tides up to 1 kilometer high and frequent tsunamis. It can also lead to increased volcanic activity and earthquakes. The moon rotates in a circle around the earth due to its centripetal force.

Without the centripetal force, the Moon would not follow a circular orbit but would move in a straight line tangent to its orbit. Tides The gravitational pull of the moon pulls the earth especially the part closest to the moon. As a result of this force, the earth's crust rises slightly a few centimeters. Even ponds and lakes like the Great Lakes experience neap tides.

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The resultant velocity of the aircraft is 3015 Km/hr while the direction is 5.7 degrees North of east

The resultant  vector is that vector that has the same effect is magnitude and direction as the two vectors acting together. Recall that velocity is a vector quantity. This implies that the magnitude and the direction of the velocity is very important.

The resultant velocity would now be obtained by considering the directions of the two velocities hence we have to work geometrically and not algebraically. We have to know that the plane is flying east at 3000 km/h. If the plane encounters a cross-wind of 300 km/h that is directed to the north

Thus the resultant velocity is;

R = √(3000)^2 + (300)^2

R = √9 * 10^6 + 9 * 10^4

R = 3015 Km/hr

The direction of this resultant velocity is;

Tan-1 (300/3000)

= 5.7 degrees North of east

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The scientific theory cannot be accepted immediately, because there is always the possibility of discovering new information or modification.

A scientific theory is an explanation of the natural world and universe that has been repeatedly tested in accordance with the scientific method. Theories are tested under controlled conditions in an experiment and are evaluated through principles of abductive reasoning.

A scientific theory differs from scientific law in that a theory explains how or why is a basic observation, whereas a law is a statement about a relationship between facts. Newton’s Law of Gravity is a mathematical equation that can be used to find the attraction between objects, but it is not a theory to describe how gravity works.

If experimental results contrary to predictions of the theory are observed, scientists evaluate whether the experimental design was good and confirm the results by independent replication.

Solutions may need some changes to the theory, or none at all, and after the successive modifications, theories consistently improve and greater accuracy is achieved.

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The refrigeration liquid is vaporized to create a chilling effect within a refrigerator.

In order for refrigerators to function, the refrigerant that circulates inside of them must transform from a liquid into a gas. Evaporation is the process that causes this cooling and results in the desired outcome.

Any surface that has a liquid on it that is evaporating will be colder than the surroundings. The cooling effect occurs when gases in an air conditioner are liquefied to the point where they will quickly evaporate at room temperature, making the environment cooler.

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Newton's third law of motion is well explanation for swimming .

Therefore ,when you swim, the force that propels you ahead is the force you use to push the water back. Force on the water equals the force a swimmer uses to advance. More force applied to water equals more force applied to you. Pushing water causes the swimmer to go ahead, which is an equal and opposite reaction.

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A proton, a subatomic particle, is found in the nucleus of every atom. The electrical charge of the particle is positive and the opposite of the electron's. If a proton were isolated, it would weigh only 1.673 x 10-27 kilos, little less than a neutron.

We will alter our speed when we are already travelling and want to go faster or slower. This roughly sums up what acceleration is. However, acceleration is not merely a matter of changing speed. Acceleration actually refers to the change in speed per unit of time. So let's imagine we want to increase or decrease our speed at a set rate. Our acceleration will be greater the faster we move.

An electric field is a physical field that surrounds electrically charged particles and acts as an attractor or repellent to all other charged particles in the vicinity. It can also refer to the physical field surrounding a system of charged particles.

Using,

a = (Vf - Vi) / t

-16 m/s² = (Vf - 264) / 15

(-16 * 15)+264 = Vf

Vf = 24 m/s

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