A particle moves along the x-axis according to the equation (x=14-7t+t^2+t^3 ), where (x) in meter and (t) in seconds. At (t=7 sec) Find (a) The position of the particle (b) It’s velocity (c) It’s acceleration​

Answer:

C) Cardiovascular, muscular strength/power, muscular endurance

Explanation:

I did take the quiz

Answer:

C) Cardiovascular, muscular strength/power, muscular endurance

Explanation:

Answer:

Motivation is basically what gets you to do something. When you're motivated, you're inspired to do something for a certain reason.

Intrinsic motivation is the want to do something for your satisfaction only. You may do something for no other reason than because you enjoying doing it.

Extrinsic motivation is doing something because of an outside force. For example, you may clean up around the house because your parents offered to up your allowance if you did or take away your phone if you didn't - both extrinsic motivations.

Answer: I think the ans is A but I’m not sure.

Can someone check it and tell me I would like to know

Explanation:

F = ma

m = 90 kg    

           a = change in v / change in time = (40-5)m/s  / 3 s =  11.67 m/s^2

F = ma = 90 kg ( 11.67 m/s^2 ) = 1050 N

Answer:

Electrical potential energy is increased.

Explanation:

When a complete circuit with a capacitor is turned on, charges are moved from one plate to another through the battery, increasing the electrical potential energy.

Based on what you learned about the roller coaster ride, the following statements about energy transformations that are true are: A. Kinetic energy can be converted into several other types of energyC. A change in an object's speed is evidence that the object's kinetic energy is changing.

The process of energy transformation is the conversion of one form of energy into another. This term describes the scientific process by which energy, in various forms, is transformed to do work. Energy transformation occurs in every physical system in the universe.

Kinetic energy can be converted into several other types of energy.Kinetic energy is the energy of a moving object. The energy is converted into various types of energy, such as electrical and thermal energy, as a result of movement. In a roller coaster, kinetic energy is converted into potential energy as the train goes up the lift hill. The potential energy is converted back into kinetic energy as the train goes down the first drop.

A change in an object's speed is evidence that the object's kinetic energy is changing.Kinetic energy changes when an object's speed changes. If an object slows down, its kinetic energy decreases, while if it speeds up, its kinetic energy increases. On the roller coaster, as the train moves up and down the track, its speed varies, causing changes in its kinetic energy.

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Answer:

  8.  225; beta

  9.  225; gamma

Explanation:

You want the atomic mass and the type of decay described by the different nuclear equations.

For the equation to be balanced, the atomic mass on the left must equal the total of the atomic mass values on the right. Similarly, the atomic number on the left must equal the total of the atomic numbers on the right.

The balanced equation would be ...

  \(\dfrac{225}{88}Ra\longrightarrow\dfrac{0}{-1}e+\dfrac{225}{89}Ac\)

During this decay, an electron and an electron neutrino are emitted, and a neutron is converted to a proton. Hence actinium 225 is created.

The atomic mass of the product is 225, and this is a form of beta decay.

The equation is balanced by putting 225 in the box, and this is a form of gamma decay. The gamma decay is indicated by the γ (gamma) symbol in the equation.

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Additional comment

The equation shown in the problem statement for Question 8 is nonsense. No such reaction is possible. That is why we have rewritten the equation, above.

The laws passed in the 1980s to reduce the use of chlorofluorocarbons (CFCs) were aimed at addressing the human-induced environmental change known as ozone depletion.

The laws passed in the 1980s to reduce the use of chlorofluorocarbons (CFCs) were aimed at addressing the human-induced environmental change known as ozone depletion. CFCs, which contain chlorine, were widely used in various applications such as aerosol propellants, refrigerants, and solvents. When released into the Earth's atmosphere, CFCs can reach the stratosphere and interact with ozone molecules, leading to the breakdown of ozone, which forms the protective ozone layer. The depletion of the ozone layer allows more harmful ultraviolet (UV) radiation from the Sun to reach the Earth's surface, posing risks to human health, ecosystems, and the environment. By reducing and eventually eliminating the use of CFCs, these laws aimed to mitigate the human-induced environmental change of ozone depletion and protect the ozone layer.

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The equation for finding speed is given by v = (x₂ - x₁) / (t₂ - t₁), where x is the displacement and t is the corresponding interval. The speed of the walking dude remains constant at 2 m/s.

To find the speed of Walking Dude, using  v = (x₂ - x₁) / (t₂ - t₁), insert the values for x and t.

For t = 0 and 2 seconds, the displacement is x = 0 and 4 meters respectively. So,

v = (4 - 0) / (2 - 0) = 4 m/s

For t = 2 and 4 seconds, the displacement is x = 4 and 8 meters respectively. So,

v = (8 - 4) / (4 - 2) = 2 m/s

For t = 4 and 6 seconds, the displacement is x = 8 and 12 meters respectively. So,

v = (12 - 8) / (6 - 4) = 2 m/s

For t = 6 and 8 seconds, the displacement is x = 12 and 16 meters respectively. So,

v = (16 - 12) / (8 - 6) = 2 m/s

Thus, the speed of Walking Dude remains constant at 2 m/s during the entire time period.

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Answer:

It does not affect. The closest nebula is the Orion Nebula at more than 1300 light years from Earth. It is so remote that nothing that happens there can influence the Earth. The only influence is to have beautiful colors and shapes and to let us dream one day to go there and explore them.

Explanation:

Answer:

When you jump off a train, you jump off a certain height and your downwards (vertical) velocity is zero. But your forward (horizontal) velocity is not. You will hit the ground on split second with your horizontal velocity practically the same as the train.

Explanation:

you be in serious injury.

Answer:

speed of light

Explanation:

the sun's light is 8 mins behind imaging that a billion fold

The length of the ray represents the magnitude of the vector.

The vectors are the quantities that have both the direction and the magnitude. The direction of the magnitude is given as the angle of the ray and the magnitude is represented by the length of the ray.

Therefore the correct answer is option 2, 'the magnitude of the vector.'

Answer:

Explanation:

moment of inertia of satellite I = 1/2 m R²

m is mass and R is radius of the disc

I = 0.5 x 8.5 x 0.8²

= 2.72 kg m²

angular acceleration α = change in angular velocity / time

α = (14.5 - 0) / 30

α = .48333

Let force of each rocket = F

torque created by one rocket = F x R

= F x .8

Torque created by 4 rockets = 4 x .8 F = 3.2 F

3.2 F = I x α

3.2 F =  2.72 x   .48333

F = 0 .41 N

Initial momentum = pi= mu

Final momentum = pf = mv

Change in momentum= Δp = (pf-pi)

Δp = mv-mu

Δp= m (v-u)

time=Δt

rate of change= Δp/Δt = m (v-u)/Δt

F=m(Δv/Δt)

F=ma

F=dp/dt

Answer:

the relative density of the gravel in the field is 0.7365 or 73.65%

Explanation:

Given that;

wet density of gravel \(r_{b}\) = 2.3 Mg/m³

field water content w = 16%

density of solids in lab \(r_{s}\) = 2.70 Mg/m³

Maximum void ratio \(e_{max}\) = 0.59

Minimum void ratio \(e_{mini}\) = 0.28

first we determine the dry density of gravel  \(r_{d}\) =  \(r_{b}\) / 1+ w

 \(r_{d}\) = 2.3 Mg/m³ / 1 + 0.16 = 2.3/1.16 = 1.9827 Mg/m³

we know that;  \(r_{w}\) = 1000 kg/m³ = 1 g/cm³

Specific Gravity of soil G = \(r_{s}\)  / \(r_{w}\)  = 2.70 Mg/m³ / 1 = 2.70 Mg/m³  

eo = ((G×\(r_{w}\))/\(r_{d}\)) - 1

eo = (( 2.70 × 1) / 1.9827 ) - 1

eo = 1.3617 - 1

Co = 0.3617

so Relative density \(I_{D}\) will be;

\(I_{D}\) = \(e_{max}\)  - eo  / \(e_{max}\) - \(e_{mini}\)

we substitute

\(I_{D}\) = 0.59  - 0.3617 / 0.59 - 0.28

\(I_{D}\) = 0.2283 / 0.31

\(I_{D}\) = 0.7365 or 73.65%

Therefore;  the relative density of the gravel in the field is 0.7365 or 73.65%

Answer:

The fundamental unit of force is kg.m/s²

Explanation:

According to Newton's second law of motion, force is given as the product of mass and acceleration.

Mathematically, force can be expressed as; F = ma

where;

F is the force

M is mass of the object, unit of mass = kg

a is acceleration of the object, unit of acceleration = m/s²

Force = kg x m/s²

Force = kg.m/s²  = Newton [N]

Therefore, the fundamental unit of force is kg.m/s²

Answer:

17.15 m/s.

Explanation:

The following data were obtained from the question:

Maximum height (h) = 15 m

Final velocity (v) = 0 m/s

Acceleration due to gravity (g) = –9.8 m/s² (since the ball is going again gravity)

Initial velocity (u) =.?

The initial velocity with which the baseball pitcher threw the ball can be obtained as follow:

v² = u² + 2gh

0² = u² + (2 × –9.8 × 15)

0 = u² + (–294)

0 = u² – 294

Collect like terms

0 + 294 = u²

294 = u²

Take the square root of both side

u = √294

u = 17.15 m/s

Therefore, the baseball pitcher threw the ball with an initial velocity of 17.15 m/s

The farmer uses this technique to protect the produce from freezing because as the water in the tubs begins to freeze, it releases heat. This heat can help to keep the surrounding air in the shed above freezing, protecting the produce from freezing as well. Additionally, as the water in the tubs freezes, it releases latent heat of fusion, which is the energy required to change a substance from a solid to a liquid. This energy is also released in the form of heat, further helping to keep the produce from freezing.

Answer:

  θ = 28.9

Explanation:

For this exercise let's use the law of refraction

          n₁ sin θ₁ = n₂ sin θ₂

where we use index 1 for air and index 2 for water where the fish is

        sin θ₂ = n₁ / n₂ sin θ₁

in this case the air repair index is 1 and the water 1.33

we substitute

        sin θ₂ = 1 / 1.33 sin t 40

        sin θ = 0.4833

        θ = sin⁻¹ 0.4833

        θ = 28.9

The horizontal distance travelled by the fish when dropped is 131.25 m.

The time of motion of the fish from the given height is calculated by applying the following kinematic equation as shown below.

h = vt + ¹/₂gt²

where;

h = 0 + ¹/₂gt²

t = √ ( 2h / g )

t = √ ( 2 x 135 / 9.8 )

t = 5.25 seconds

The horizontal distance travelled by the fish when dropped is calculated as;

X = vt

X = 25 m/s  x  5.25 s

X = 131.25 m

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Answer:

The formula for potential energy depends on the force acting on the two objects.

Answer:

due to the land structure of Nepal

Answer:

Potential energy only occurs when an object is in motion.

Explanation:

Energy can be defined as the ability (capacity) to do work. The two (2) main types of energy are;

a. Kinetic energy (K.E): it is an energy possessed by an object or body due to its motion.

Mathematically, kinetic energy is given by the formula;

\( K.E = \frac{1}{2}MV^{2}\)

Where;

K.E represents kinetic energy measured in Joules.

M represents mass measured in kilograms.

V represents velocity measured in metres per seconds square.

b. Potential energy (P.E): it is an energy possessed by an object or body due to its position above the earth.

Mathematically, potential energy is given by the formula;

\( P.E = mgh\)

Where,

P.E represents potential energy measured in Joules.

m represents the mass of an object.

g represents acceleration due to gravity measured in meters per seconds square.

h represents the height measured in meters.

Additionally, the mechanical energy of a physical object or body is the sum of the potential energy and kinetic energy possessed by the object or body.

Mathematically, it is given by the formula;

Mechanical energy = P.E + K.E

Answer:

Kinetic energy.

The explanation never existed

Answer: Kinetic Energy

Answer:

98.105610 Kilometers

Explanation:

Rounded to 8 digits

Answer:

98.11 km

Explanation:

60.96 mi (5280ft/mi)(12 in/ft)(2.54 cm/in)(1 m/ 100cm)(1 km/1000 m) = 98.10561024 km

however, reporting this precision to the nearest hundred millionth of a kilometer is silly as we only know the mile dimension to the nearest hundredth of a mile.

A hundredth of a mile is 5280/100 = 52.8 ft or just over 16 m

It would only be a little bit of a presumption to give our precision to the nearest 10 meters as I have done.

This also fits neatly into the significant digits rule. Both the original dimension and the converted dimension have four significant digits.

Energy effectiveness would be a term that refers to the proportion of input power over output. Power generation, as well as simply energy utilization, is the process of reducing the amount of energy used to produce goods and services.

Considering that,

A cookie contains 54.0 kcal of energy. An athlete utilizes the 54.0 kcal inside this cookie from input energy.

The following diagram illustrates the relationship among input as well as output energy:

Efficiency = output energy / input energy...(i)

Output energy = efficiency × input energy

By using equation (i)

⇒ output energy = 0.25 × 54 kcal = 13.5 kcal.

The lifting exercise has been performed n times for the output energy.

In terms of potential energy, such output energy could be written as follows:

Mass × gravity ×height.

So, energy per repetition = mgh = 103 kg × 9.8 m/ × (2.45 × 0.1m) = 247.303 J =  0.059 kcal.

So, Count of repetitions = sim of output energy / energy per repetition..(ii)

By using equation (ii)

Count of repetitions = 13.5 kcal / 0.059 kcal =229 repetitions.  

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The gravitational pressure among two objects is f

F=(Gm1, m2) /r^2 so force here is immediately proportional to the mass.

Since the gravitational force is inversely proportional to the rectangular separation distance between the two interacting gadgets, more separation distance will result in weaker gravitational forces. in order for two gadgets to be separated from every other, the force of gravitational enchantment between them also decreases.

The pressure of gravity relies upon without delay loads of the 2 objects, and inversely the rectangular gap between them. which means that the force of gravity increases with mass, but decreases with growing distance among gadgets.

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Answer:

Yes it is matter

Explanation:

In physics, usually the word "electricity" isn't really used. "Electric current" is more common, and is defined as the flow of charges, where the charges are held by particles (electrons). Electrons have mass, so they are definitely matter.