a boy sleading down a hill accelerates
alt 1.40m/s? If he started from rest, in what
In what distance would he reach a speed.
of 7s?

The acceleration of the cheetahs in the standard international units would be 8.938 meters/second².

The rate of change of the velocity with respect to time is known as the acceleration of the object.

As given in the problem a cheetah goes from standing still to running at 60  miles per hour in 3 seconds

1 mile = 1609 meters

60 miles = 60×1609 meters

               =96540 meters

1 hour = 3600 seconds

the initial velocity of the cheetah = 0

the final velocity of the = 96540/3600

                                      =26.8166 meters/seconds

acceleration = (final velocity - initial velocity) /time period

                    =(26.8166 -0)/3

                    =8.938 meters/second²

Thus, the cheetah's acceleration would be 8.938 meters/second².

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Explanation:

The potential energy of an object is given by :

P = mgh

Where,

m is mass, g acceleration due to gravity and h is the height reached by the object.

The potential energy of an object is directly proportional to the height of the object. It means that when the skateboard reaches at the maximum height, it has highest potential energy.

Answer:

I dont even know my g

Explanation:

Like i cant even help u

Answer:

Kinetic sand is regular sand that's been coated with silicone oil

Explanation:

hope it helps

A sample of matter experiences a decrease in average kinetic energy as it continues to cool. One would anticipate that the particles will eventually come to a complete stop. The temperature at which particles should theoretically stop moving is absolute zero. Thus, option B is correct.

What theory directly contradicts concept of absolute zero?

All molecules are predicted to have zero kinetic energy and, as a result, no molecular motion at absolute zero (273.15°C). Zero is a hypothetical value (it has never been reached).

Absolute zero signifies that there is no kinetic energy involved in random motion. A substance's atoms don't move relative to one another.

Therefore, Kinetic energy because it can create heat which goes against the absolute zero. A gas molecule's kinetic energy tends to zero when the temperature reaches absolute zero.

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Answer: B

Explanation: just did the quiz

Vector B shows the direction of the centripetal acceleration at this point.

Centripetal acceleration is the acceleration of a frame traversing a circular path. because the pace is a vector quantity (this is, it has both a magnitude, the rate, and a course), when a frame travels on a circular course, its route continuously adjustments, and accordingly its velocity changes.

Centripetal forces motivate centripetal accelerations. within the special case of the Earth's circular motion around the sun – or any satellite's ground movement around any celestial body – the centripetal force causing the movement is the end result of the gravitational enchantment among them.

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Answer:A scientific model is a physical and/or mathematical and/or conceptual representation of a system of ideas, events or processes. Scientists seek to identify and understand patterns in our world by drawing on their scientific knowledge to offer explanations that enable the patterns to be predicted.

Explanation: got right

Answer:

A scientific model is a physical and/or mathematical and/or conceptual representation of a system of ideas, events or processes. Scientists seek to identify and understand patterns in our world by drawing on their scientific knowledge to offer explanations that enable the patterns to be predicted.

Answer:

i think transport energy....but i'm not sure ...

Explanation:

A wave carries energy and momentum but does not carry matter: the particles vibrate around the equilibrium position but do not travel with the disturbance

Answer:

A) 1.79ohms

Explanation:

Total resistance of resistors in parallel is given by ;

1/R = 1/R1 + 1/R2 +1/R3

Put in the values and make R the subject

Answer:

A) 20.8 m/s

B) h_max = 11 m

Explanation:

A) Formula for projectile range is;

R = (u²sin2θ)/g

We want to find initial velocity, so let's make u the subject.

u = Rg/sin2θ

We are given;

R = 44 m

θ = 45°

Thus;

u = √[(44 × 9.8)/sin 2(45)]

u = √[431.2/sin 90]

u = 20.77 m/s ≈ 20.8 m/s

B) maximum height will be gotten from the formula;

h_max = (R tan θ)/4

h_max = (44 × tan 45)/4

h_max = (44 × 1)/4

h_max = 11 m

Answer:

It also increases

Explanation:

The strength of the gravitational force between two objects depends on two factors, mass, and distance. the force of gravity the masses exert on each other. If one of the masses is doubled, the force of gravity between the objects is doubled. increases, the force of gravity decreases.

Answer:

The correct option is;

Stream of particles

Explanation:

Light can be observed to behave as stream of particles in the physical phenomenon of blackbody radiation and photoelectric effect whereby electrons are ejected by the impact of light such that the number of electrons ejected is a function of the amount of photons transmitted which are absorbed by the electrons before they can be ejected

The energy of the photons depends on the frequency of the light source of the photons, while the electrons are ejected when the energy of the photon is up to their threshold value

As such light can also be considered as behaving as a stream of particles called photons.

Answer:

a) W=9000J

b) W=11,666.67 J

c) The work done by the gas with a 1 meter barrel is 2,666.67 J greater than the work done by the gas with a 0.600 m barrel. This is about 1.3 times greater.

Explanation:

(The function written in the problem isn't too clearly written, but I believe it should be like this:

A 100-g bullet is fired from a rifle having a barrel 0.600 m long. Choose the origin to be at the location where the bullet begins to move. Then the force (in newtons) exerted by the expanding gas on the bullet is [tex]15 000 + 10 000x - 25 000x^{2}[/tex] , where x is in meters. (a) Determine the work done by the gas on the bullet as the bullet travels the length of the barrel. (b) What If? If the barrel is 1.00 m long, how much work is done, and (c) how does this value compare with the work calculated in part (a)?)

a)

Since the force applied to the bullet is going to vary with the length of the barrel, we will need to make us of integration to find the work done by the gas.

So first, we start by drawing a sketch of what the problem looks like. (See attached picture). This will help us visualize the problem better.

Now, work is defined as the following integral:

[tex]W=\int\limits^a_b {F} \, dx[/tex]

The problem tells us the force exerted by the expanding gas on the bullet is:

[tex]F(x)=15,000+10,000x-25,000x^{2}[/tex]

So we go ahead and substitute this function into the integral.

[tex]W=\int\limits^{0.6}_0 {15,000+10,000x-25,000x^{2}} \, dx[/tex]

Now, before integrating that function, we can factor it so it is easier for us to integrate and to deal with the values, so we can factor a common 5,000 out, so we get:

[tex]W=5,000\int\limits^{0.6}_0 {3+2x-5x^{2}} \, dx[/tex]

and we proceed to integrate so we get:

[tex]W=5,000[3x+x^2-\frac{5}{3}x^{3}]\limits^{0.6}_0[/tex]

and evaluate the integral, so we get:

[tex]W=5,000([3(0.6)+(0.6)^2-\frac{5}{3}(0.6)^{3}]-[3(0)+(0)^2-\frac{5}{3}(0)^{3}][/tex]

Which yields:

W=9000J

b)

For part b we follow the exact same procedure but we change the limits of integration for 0 and 1 so the integral looks like this:

[tex]W=\int\limits^1_0 {15,000+10,000x-25,000x^{2}} \, dx[/tex]

and we get the following answer:

[tex]W=5,000[3x+x^2-\frac{5}{3}x^{3}]\limits^1_0[/tex]

and

[tex]W=5,000([3(1)+(1)^2-\frac{5}{3}(1)^{3}]-[3(0)+(0)^2-\frac{5}{3}(0)^{3}][/tex]

so

W=11,666.67 J

c) The difference between the two works we calculated is:

11,666.67J-9000J=2,666.67J

so the work done by the gas with a 1 meter barrel is 2,666.67 J greater than the work done by the gas with a 0.600 m barrel.

if we did the following division:

[tex]\frac{11,666.67}{9,000}=1.3[/tex]

So we can see that this is about 1.3 times greater.

Answer: Sound waves are examples. parallel - For the purposes of this Activity Object, parallel is defined as moving in the same direction. Specifically in the case of longitudinal waves, particles move forward and back parallel to the direction of the travelling wave. ... Some examples are ocean waves and light waves.

Explanation:

Answer:

I'm pretty sure it's A. long time, small force.

Answer:

Tanya

[tex]2.43\ \text{s}[/tex]

Explanation:

[tex]d[/tex] = Distance traveled = 1 mile

[tex]s_t[/tex] = Tanya's average speed = [tex]0.15\ \text{mi/s}[/tex]

[tex]s_b[/tex] = Tanya's brother's average speed = [tex]0.11\ \text{mi/s}[/tex]

Time taken by Tanya

[tex]t=\dfrac{d}{s_t}\\\Rightarrow t=\dfrac{1}{0.15}\\\Rightarrow t=6.67\ \text{s}[/tex]

Time taken by Tanya's brother

[tex]t=\dfrac{d}{s_b}\\\Rightarrow t=\dfrac{1}{0.11}\\\Rightarrow t=9.1\ \text{s}[/tex]

So Tanya will reach the end of the block first.

She will reach the end of the block by [tex]9.1-6.67=2.43\ \text{s}[/tex]

Answer:

Explanation:

mass x velocity

so i believe it'd be

2,790 x 88.0

but i could be wrong just an fyi

The most popular commercial aircraft worldwide range in weight from 30,900 to 127,000 pounds. Personal aircraft typically weigh between 740 to 2,750 pounds, which is a significant reduction in weight. The weight of a modern fighter jet ranges from 20,300 to 45,000 pounds. Aircraft are hefty.

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Answer:

Density

Explanation:

Density is defined as the ratio of mass of an object to the volume of object.

The density remains an equivalent because cutting the brick into small pieces will divide the mass & volume by an equivalent amount. This means the density of a object remains an equivalent (or same) regardless of what size shape, length, it is.

Answer:

C.)water

Explanation:

Weathering is the physical disintegration and chemical decomposition of rocks to form sediments and soils.

Mechanical weathering is the breaking down of rocks by physical means.

Chemical weathering is the decay of rocks by chemical means.

Answer:

[tex]{FY} = \dfrac{3}{4} \times FX[/tex]

Explanation:

The parameters given for the planets are;

The mass of planet X = M and the radius of planet X = R

The mass of planet Y = 3·M and the radius of planet Y = 3·R

The magnitude of the gravitational force of the planets on their satellites are given by the following equation;

[tex]F=G \times \dfrac{M_{1} \cdot m_{2}}{R^{2}}[/tex]

Where;

M₁ = The mass of the first object = The mass of the planet

m₂ = The mass of the second object = The mass of the satellite

R = The distance between the centers of the two planets = The distance between the center of the planet and the satellite

G = The universal gravitational constant

The force between planet X and the satellite in its orbit = [tex]FX=G \times \dfrac{M \times m}{(2 \cdot R)^{2}} = G \times \dfrac{M \times m}{4 \cdot R^{2}}[/tex]

The force between planet Y and the satellite in its orbit = [tex]FY=G \times \dfrac{3\cdot M \times m}{(4 \cdot R)^{2}} = G \times \dfrac{3\cdot M \times m}{16 \cdot R^{2}} = G \times \dfrac{ 3\cdot M \cdot m}{16 \cdot R^{2}}[/tex]

Therefore;

[tex]\dfrac{FY}{FX} = \dfrac{G \times \dfrac{ 3\cdot M \cdot m}{16 \cdot R^{2}}}{G \times \dfrac{M \times m}{4 \cdot R^{2}}} = \dfrac{3}{16} \times \dfrac{4}{1} = \dfrac{3}{4}[/tex]

[tex]{FY} = \dfrac{3}{4} \times FX[/tex]

Answer:

this might be confusing but..

Explanation:

To find an object's mass using its weight, the formula is Mass equals Weight divided by the Acceleration of Gravity (M = W ÷ G). Convert the weight measured in pounds to the equivalent in Newtons. In the formula for determining mass based on weight, mass is measured in Newtons.

Answer:

The earth-atmosphere energy balance is the balance between incoming energy from the Sun and outgoing energy from the Earth. Energy released from the Sun is emitted as shortwave light and ultraviolet energy. When it reaches the Earth, some is reflected back to space by clouds, some is absorbed by the atmosphere, and some is absorbed at the Earth's surface.

Explanation:

Answer: Work DONE =- 75Nm = 75 Joules

Explanation:

Work is done when a force applied to an object, cause a displacement  by causing  such object to move   Thus work is calculated by multiplying the force by the distance moved by the  object.

From the question,

Given  that force= 25N

Distance = 3m

therefore

Work  = Force x Distance

          25N X 3m =

= 75 Nm = 75 Joules

Answer:

False

Explanation:

A lot of inventors worked on inventions due to things that society needed. For example, Alexander Graham Bell created the telephone because we didn't have a stable line of communication back then.

Answer:

Antimony is metalloid

Explanation:

From the properties of the metals given, we can conclude that antimony is pure a metalloid.

A metalloid has the properties of metals and non-metals.

Answer:

D: tipping over dominoes

Explanation:

tipping over dominoes makes a wave-like movement

Answer:

the answer is D. just got it right 4/19/22

Explanation: