If a ball is rolling down a hill, it has both kinetic and potential energy. The ball has
38 J of potential energy because of its height and 80J of kinetic energy because
of its motion. How much mechanical energy does the ball have

Answer: A. An ice hockey player picks up a trophy as he slides past it

Explanation:

A PE X

The statement that best describes a perfectly inelastic collision is

C. A surfer falls off of his surfboard when a wave hits him.

A collision is the interaction between two bodies in such a way that the momentum and velocity of one body gets changed due to the presence of other body. There are three types of collision-

1. Elastic collision

2. Inelastic collision

3. Perfectly inelastic collision.

In all types of collision , the momentum of the system before collision and after collision always remains same or we can say that momentum is conserved in collisions

An elastic collision is the one in which kinetic energy is also conserved and coefficient of restitution is one. Both the bodies move separately with different velocities after elastic collision.

In inelastic collision  there is a loss of kinetic energy and coefficient of restitution is less than one.

In perfectly inelastic collision there is maximum loss of kinetic energy and coefficient of restitution is zero. Both the bodies stick together after collision and move with same velocity

Coefficient of restitution is the  ratio of  relative velocity of separation after collision to relative velocity of approach before collision.

A surfer falls of his surfboard when a wave hits him is an example of perfectly inelastic collision because in this when water hits the surfers he falls of and sticks to the water , and will also now move with the velocity of water .

So  when the surfer falls off his surfboard when a wave hits him is perfectly inelastic collision.

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Answer:

Newton's second Law of motion

Answer:

courts of appeals

Explanation:

hope this helps

Answer:

1.32 × 1022 short tons

Explanation:

hope this helps

The required mass of the planet is 8 times the mass of the earth.

Given that,
The Escape speed at the surface of a certain planet is twice that of the earth. The planet has a radius twice of the Earth. what is its mass in unit of earth's mass is to be determined.

An object with this velocity at the earth's surface will completely escape the earth's gravitational field, even after accounting for atmospheric losses.

here,
The escape velocity of the planet = 2 Escape velocity of the earth
[tex]\sqrt{{2GM_p}/r_p} = 2\sqrt{2GM_e/r_e}[/tex]
Substitute the values and square both sides,
[tex]{{2GM_p}/2r_e} = 4*{2GM_e/r_e}\\M_p = 8M_e[/tex]

Thus, the required mass of the planet is 8 times the mass of the earth.

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Answer:

I would include extra insulation, a heating system, and some snug-fitting sweaters.

Explanation:

that way i won't get cold

A. Conduct an exam. Thomas might have a drug dependence.

(Please mark Brainliest! :D)

Answer:

4 times what it is now.

Explanation:

g=G(M/r^2)

G is constant, so ignore.

We have (1M/0.5r^2), or 4.

Answer:

4g

Explanation:

the equation of g (field gravity)

g = G M/R²

because G (Contant of Gravitasion) and M (Mass of earth) same, them

g2/g1 = R1²/R2²

g1 = g now

g2 = g which the value we looking for

g2/g = 1/(1/2)²

g2/g = 1/(1/4)

g2/g = 4

g2 = 4g

Answer:

d

Explanation:

Answer:

D.)

Parent cells create copies of their components.

Explanation:

edge2021

ok i dont know to be honest

The position of the Earth, Sun, and moon during the solar eclipse, a student observes a shadow moving across the sun is Sun, moon, Earth, so option D is correct.

When the Moon passes in front of the Sun, blocking all or part of Earth's view of it, a solar eclipse occurs. The Moon is closest to the plane of the Earth's orbit when there is a new moon and such an alignment. During a total eclipse, the Moon fully obscures the Sun's disk. Partial and annular eclipses only block out a section of the Sun. A solar eclipse occurs naturally. Solar eclipses were sometimes linked to supernatural sources or interpreted as an ill omen in several ancient and modern societies.

During a solar eclipse, the moon comes in between the earth and the sun therefore the shadow moves across the sun during a solar eclipse observed by the student, the position is Sun, moon, and earth.

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Answer:

~ 0.001 m/s^2

Explanation:

If you convert 12 miles per hour to, miles per second, it makes this easier to calculate, so do that first

12m/ 1 hour * 1 hour/ 60 mins * 1 min/ 60 sec = ~0.003333 miles per second.

Next remember that acceleration = velocity/time

So our new velocity: 0.003333 over time: 3 seconds = the acceleration.

0.003333/3 = 0.001 m/s^2

Answer:

0.4

Explanation:

average velocity =d/t

2/5=0.4

0.4m

Answer:

MIXTURE

1 In a mixture two or more substances are mixed together (elements or compounds)

2Therd is no fixed proportion of the constituents

3 The mixture may or may not be homogenous

4 There is no chemical reaction between the constituent substances

5 There cannot be a chemical formula for a mixture

6 Heat or any other type of energy is not required or released during the formation of a mixture

7 The constituents can be separated using simple physical processes

8 The properties of the constituents are retaied

COMPOUND

1 Two or more elements form a compound

2 The constituent elements combine in a definite proportion to form a compound

3 The elements are in a definite proportion in any part or fraction of the compound

4 There is a chemical reaction in the formation of a compound

5 A compound has always a chemical formula for a compound

6 Heat orany other energy is often required for the formation of a compound or released during the formation of a compound

7 The constituent elements can't be separated using simple physical processes in case of a compound

8 The properties of the constituent elements are not retained in the compound

Answer:

An arch in a memorial park, having a parabolic shape, has a height of 25 feet and a base width of 30 feet.

The equation of the parabolic arch with the height of 3m and base width of 3m is x²= 3/16 y.

Any point on a parabola is at an equal distance from both the focus, a fixed point, and the directrix, a fixed straight line. A parabola is a U-shaped plane curve. An essential component of a conic section is a parabola.

A parabola is formed by cutting a right circular cone in half along a plane perpendicular to the cone's generator. It is a locus of a moving point whose separation from the focus is equal to its separation from a stationary line (directrix) Focus refers to the fixed point, and directrix refers to the fixed line.

The equation of a parabola is x² = 4ay.

Height of the arch = 3 m

base width = 3 m

thus it goes through the point (3/2, 3)

then, (3/2)²  = 4 a 3

a =  9 / (4× 12) = 3 /16

Then the equation of the parabolic arch becomes  x² = 3/16 y.

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Answer:

Workdone = 1.96 Nm

Explanation:

Given the following data;

Mass = 100g to kg 100/1000 = 0.1Kg

Distance = 2m

To find the workdone;

First of all, we would determine the force acting on the apple

Force = mass * acceleration due to gravity

But, acceleration due to gravity is equal to 9.8m/s²

Force = 0.1 * 9.8

Force = 0.98N

Now, we can find the workdone using the formula;

Workdone = force* distance

Substituting into the equation, we have

Workdone = 0.98 * 2

Workdone = 1.96 Nm

Explanation:

formula: Mass

Density x volume

2a) m=10kg v=0.3m³

10÷0.3=33.3 kg/m

2b) m = 160 kg V=0.1m³

160÷0.1=1600 kg/m

2c) m = 220 kg V = 0.02m³

220÷0.02=11000 kg/m

A wooden post has a volume of 0.025m³ and a mass of 20kg. Calculate its density in kg/m.

density = volume ÷ mass

20÷ 0.025=800 kg/m

Challenge: A rectangular concrete slab is 0.80m long, 0.60 m wide and 0.04m thick. Calculate its volume in m³.

Formula : Length x width x height = Volume

0.80 x 0.60 x 0.04 = 0.0192m³

B) The mass of the concrete slab is 180 kg. Calculate its density in kg/m.

density = volume ÷ mass

180 ÷ 0.0192 = 9375 kg/m

Answer:

You'll see it without noticing

Explanation:

for example: Magnets can pull to one thing, but using the other side of the magnet with the other magnet can push away the magnets, and turn it to their way of pulling, also electricity, movement, were making energy everyday, just by moving

Answer:

Hypothesis.

Explanation:

Not a question, not a summary, and not an experiment.

Answer:

[tex]5,480\:\text{N}[/tex]

Explanation:

The formula for work is given by [tex]W=F\Delta x[/tex], where [tex]F[/tex] is the force applied over a distance of [tex]\Delta x[/tex].

Plugging in given values, we get:

[tex]16,700=F\cdot 3.05,\\F=\frac{16,700}{3.05},\\F\approx \boxed{5,480\:\text{N}}[/tex](three significant figures).

Answer:

Answer:

hi

Explanation:

The choice that is not a common injury in sports is hemorrhage and arthritis. Details about injuries can be found below.

Sport is any activity that uses physical exertion or skills competitively under a set of rules that is not based on aesthetics.

Injuries are bound to occur during sporting activities and they are as follows:

Hemorrhage, which refers to the heavy release of blood within or from the body and arthritis, which is an inflammation of a joint or joints are not common injuries involved in sports.

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Answer:

B

Explanation:

:p

Option B is the correct answer.

Graphite has a layered structure, every layered structure has rings which consists of six carbon atom.

   Graphite can be also known as black lead. As it can be structured with hexagonal shape it was also made as octahedral and tetrahedral which is known to be as diamond. Graphite is formed by carbonaceous compound, which can be solidified as magmatic carbon. Graphite can be taken from several ancient rocks, marbles, quartzite, under the soil, etc..  The graphite can be found easily by seeing the honeycomb shape, hexagonal structure, a molecule with six carbon atoms. These were also used in pencil leads, batteries, nuclear reactors, polishes, etc..

So, when Maria rubbed her solid graphite pencil against paper, it easily left a clear streak on the paper because of the atom presence and it hexagonal honeycomb structure.

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Answer: B An action-reaction force pair

Explanation: Took the exam

The arrows in this photograph represent: An action-reaction force pair. Hence, option (B) is correct.

When two bodies interact, they exert an equal and opposite force on one another in accordance with Newton's third law of motion. Action-reaction forces are made up of these forces.

"When one body exerts a force on the other body, the first body experiences a force that is equal in magnitude in the opposite direction of the force which is exerted," according to Newton's third law of motion.

According to the above assertion, there are always two forces operating on the objects involved in an interaction. The forces are of identical magnitude, but the direction of the force acting on the first object is different from the direction acting on the second.

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Answer:

B..it is conserved

Explanation: