please help! this this timed!!!

Answer:

D

Explanation:

The density has a formula of d = m / V.

The volumes are given as the same.

The density will be

d_lead = 113/ V

d_aluminum = 27/V

It does not matter for this question what the volume actually is. Just note that the value of the volume is the same for each ball.

A: incorrect. If the volumes are the same, the density is not the same because the masses are different.

B: incorrect. If the density of the two balls was less than water, the two balls would float. Never going to happen unless the balls are thin shells.

C: incorrect. The exact opposite is the answer.

D: Correct. This is the answer.

Answer:

-1.6

Explanation:

e2021

The Height of an Image for a Convex Mirror is calculated by using magnification equation

m = h(i) / h(o)  = − d(i) / d(o) ,where  

the magnification index of the mirror, m

the height of the object, h(o)

the height of the image, h(i)

the distance between the object and the mirror, d(o)

the distance between the image and the mirror, d(i)

h(i)/ 2 = -8 / 10

h(i) = -1.6 cm.

"Convex Mirror is a curved mirror where the reflective surface bulges out towards the light source. This bulging out surface reflect light outwards and are not used to focus light."

"The formula for magnification is m=h(i)/h(o)=-d(i)/d(o). m is the total magnification; h(i) is the height of the image; h(o) is the height of an object; d(i) is the distance from the lens to the in focus projected image; d(o) is the distance of the object to the lens. The negative sign represents that the image is inverted."

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Answer:

gravity it's what keeping it to rotate and keeping it looping

Answer:

a

Explanation:

Answer:

C

Explanation:

C

Answer:

118.4kgm/s

Explanation:

Given parameters:

Weight of object  = 19.6N

          mass of object  = 19.6/9.8   = 2kg

Constant velocity  = 20m/s

Force applied  = 6N

Time taken  = 4s

Unknown:

Final momentum of the object  = ?

Solution:

To solve this problem, we use Newton's second law of motion;

           Ft  = m (v  - u)

F is the force applied

t is the time taken

m is the mass

v is the initial velocity

u is the time taken

           Ft  = mv  - mu

mv is the final momentum;

       So;

     Final momentum  = Ft + mu

 Final momentum  = (19.6 x 4) + (2 x 20) = 118.4kgm/s

Answer:

Only the goalie is allowed inside the goal crease. The only exception when another player is allowed in the goal area is when they take off from outside the goal area, and shoots or passes the ball before landing. To avoid interference with other players, the player must then exit the goal area as soon as possible.

Explanation:

Answer:

Explanation:

uhm answer is 6x8 +6+4 divded by the race seconds

Answer:

0.67m/s2

Explanation:

The horizontal force must be applied to a vehicle of mass 1300 kg and of acceleration of 2.6 m/s² will be 3380 N. Hence, option B is correct.

The rate of change in an object's velocity concerning time is known as acceleration in mechanics. The vector quantity of accelerations. The direction of the net force that is acting on an object determines its acceleration.

Since acceleration has both a magnitude and a direction, it is a vector quantity. Velocity is a vector quantity as well.

According to the question, the given values are :

Mass, m = 1300 kg

Acceleration, a = 2.6 m/s²

Force = 1300 × 2.6 m/s²

F = 3380 N.

So, the force applied will be, 3380 N.

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Answer:

They remain the same

Explanation:

As the molecule goes from reactants to products, the number of atoms in the each of the element remains the same.

This is in compliance with law of conservation of matter. The law proposes that "in a chemical reaction, matter is neither created nor destroyed by changed from one form to another".

So, since no matter is destroyed, the number of atoms during a chemical change remains the same before and after a reaction.

This is applicable to all chemical changes.

Answer:

gravity

Explanation:

Answer: gravity

Explanation: Newton's revolutionary idea was that gravity is universal - ALL objects attract in proportion to the product of their masses. Gravity is universal.

Explanation:

Gravity

Gravity is one major force that creates tides. In 1687, Sir Isaac Newton explained that ocean tides result from the gravitational attraction of the sun and moon on the oceans of the earth (Sumich, J.L., 1996).

Answer:

1 half kilometer is right answer

Answer:b

Explanation:

Answer:

B

Explanation:

edg

Answer:

A. 10 joules

Explanation:

Given parameters:

Mass of object  = 4kg

Speed  = 5m/s

Unknown:

Kinetic energy of the the object  = ?

Solution:

Kinetic energy is the energy due to a moving body.

So;

           mathematically;

    K.E  = [tex]\frac{1}{2}[/tex] x m v²

m is the mass

v is the velocity

  K.E  =  [tex]\frac{1}{2}[/tex]  x 4 x 5  = 10J

The kinetic energy of the given moving object is 50 J. The  Kinetic energy of an object is the energy due to its motion.

The  Kinetic energy of an object is the energy due to its motion. It can be given as

[tex]KE = \dfrac 12 mv^2[/tex]

Where,

[tex]m[/tex] - mass = 4 kg

[tex]v[/tex] - velocity =  5 m/sec.

Put the values in the formula,

[tex]KE = \dfrac 12 4 \times 5^2\\\\KE = 50 \rm \ J[/tex]

Therefore, the kinetic energy of the given moving object is 50 J.

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Answer:

B and C

Explanation:

It is a reaction between a component(chemical reaction).

Answer:

trough

Explanation:

It is the lowest point of the wave

Answer:

Eat more healthy foods and keep more active.

Explanation:

Explanation:  

In physics, potential energy is the energy held by an object because of its position relative to other objects, stresses within itself, its electric charge, or other factors. Common types of potential energy include the gravitational potential energy of an object that depends on its mass and its distance from the center of mass of another object, the elastic potential energy of an extended spring, and the electric potential energy of an electric charge in an electric field. The battery is storing the energy but give it something to power and it'll give its energy to the object and a violin strings are like ruber band and if you play the violin it releases a new type of energy sound energy.

Answer:

0.2g/cm³  

Explanation:

Given parameters:

Mass of the beef  = 11.6g

Volume  = 58cm³  

Unknown:

Density  = ?

Solution:

Density is the mass per unit volume of a substance.

  Density  = [tex]\frac{mass}{volume}[/tex]  

So;

  Density  = [tex]\frac{11.6}{58}[/tex]    = 0.2g/cm³  

[tex] \sf• \: Current \: (I) = 100 \: Amps.[/tex]

[tex] \sf• \: Resistance \: (R) = 50 \: ohms[/tex]

[tex] \\ [/tex]

[tex] \sf• \: Voltage \: (V)[/tex]

[tex] \\ [/tex]

[tex] \huge\bf{ \underline{Solution:- }}[/tex]

[tex] \bf \red{ \bigstar{ \: The \: formula \: of \: Voltage \: (V) = IR}}[/tex]

[tex] \rightarrow \sf V = 100 \times 50[/tex]

[tex] \rightarrow \sf V = 5000[/tex]

[tex] \\ [/tex]

[tex] \bf \purple{Therefore, \: Volatage \: is \: 5000 \: v.}[/tex]

Answer:

11.2Watts

Explanation:

Given parameters:

Energy produced by the engine  = 670J

Time taken  = 1min  = 60s

Unknown:

Number of watts it can output  = ?

Solution:

This problem entails finding the power of the engine.

Power is the rate at which work is being done.

So;

      Power  = [tex]\frac{Work done }{time}[/tex]  

       Power  = [tex]\frac{670}{60}[/tex]    = 11.2Watts

Answer: its B I jus took it

Explanation: