Which of the following represents the Law of Conservation of Mass?
(look at picture)​

Answer:

The change in kinetic energy of the car is -189434 joules.

The work done by the car is 189434 joules.

The magnitude of the force that pushed the front of the car is 498510.526 newtons.

Explanation:

Given that the car is moving on a horizontal ground, by the Principle of Energy Conservation and the Work-Energy Theorem we get the following identity:

[tex]\Delta K+\Delta W = 0[/tex] (1)

Where:

[tex]\Delta K[/tex] - Change in the translational kinetic energy of the car, measured in joules.

[tex]\Delta W[/tex] - Work done by the car, measured in joules.

By applying the defintions of translational kinetic energy and work, we expand and simplify the resulting equation:

[tex]\frac{1}{2}\cdot m \cdot (v_{f}^{2}-v_{o}^{2})+F\cdot \Delta s = 0[/tex] (2)

Where:

[tex]m[/tex] - Mass, measured in kilograms.

[tex]v_{o}[/tex], [tex]v_{f}[/tex] - Initial and final speeds of the car, measured in meters per second.

[tex]F[/tex] - Force exerted by the car, measured in newtons.

[tex]\Delta s[/tex] - Travelled distance of the front of the car, measured in meters.

The change in the kinetic energy of the car and the work done by the car are, respectively: [tex](v_{o} = 14\,\frac{m}{s}, v_{f}= 0\,\frac{m}{s}, m = 1933\,kg, \Delta s = 0.38\,m)[/tex]

Translational kinetic energy

[tex]\Delta K = \frac{1}{2}\cdot m\cdot (v_{f}^{2}-v_{o}^{2})[/tex]

[tex]\Delta K = \frac{1}{2}\cdot (1933\,kg)\cdot \left[\left(0\,\frac{m}{s} \right)^{2}-\left(14\,\frac{m}{s} \right)^{2}\right][/tex]

[tex]\Delta K = -189434\,J[/tex]

Work done by the car

[tex]\Delta W = -\Delta K[/tex]

[tex]\Delta W = 189434\,J[/tex]

Magnitude of the force

[tex]F = \frac{\Delta W}{\Delta s}[/tex]

[tex]F = \frac{189434\,J}{0.38\,m}[/tex]

[tex]F = 498510.526\,N[/tex]

The change in kinetic energy of the car is -189434 joules.

The work done by the car is 189434 joules.

The magnitude of the force that pushed the front of the car is 498510.526 newtons.

Answer:

Potassium > Vanadium > Zinc > Bromine

Explanation:

The size of an atom can be difficult to estimate. It is measured in terms of the atomic radius.

It is the taken as half of the inter-nuclear distance between covalently bonded atoms of non-metallic elements or half the distance between two nuclei in the solid state of metals.

The elements given all lie in the same period so their atomic radius decreases.

Answer:

K and N

Explanation:

Ionic character depends on the electronegativity difference between the bonding elements. The greatest the elctronegativity diffference the greatest the ionic character. The electronegativity difference between K and N is the greatest among the four options as N is one of the most electronegative elements.

Answer:

A

C

D

A

Explanation:

______ are NOT a source of arsenic in the environment.

The policy change which was based on the results of the students’ water-testing project is:

Damage to the body’s _______ system can affect brain development, learning, and memory. *

The element arsenic is a ______. *

Pesticides are those chemicals which are used particularly in killing pests such as harmful insects which cause a nuisance to the environment.

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Answer:

inner core ,outer core,and mantle

Answer: 4m/s

Explanation:

Speed = distance/time.

= 2/2 = 1 m/s

"Speed is defined as the distance travelled by a body per unit time." Its SI unit is m/s.

The distance covered by an object in unit time. In other words, the rate at which the object is moving is called speed

"Distance is the actual path length traveled by an object in the given interval of time during the motion. It is a positive scalar quantity."

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Answer:

100% of the energy entering earth's atmosphere comes from the sun. ~50% of the incoming energy is absorbed by the earth's surface i.e. the land and oceans.

Answer: B: The car is speeding up in the same direction as it is traveling.

Explanation:

I took the test and got it right

Answer:

its either d or a

Explanation:

imma say d looks pretty right though

Answer:

It applies to diverse phenomena

Explanation:

not sure if u need one, just ask if you do :D

Answer:

Being strictly geometric in its origin, the inverse square law applies to diverse phenomena. Point sources of gravitational force, electric field, light, sound, and radiation obey the inverse square law.

Explanation:

Answer:

C

Explanation:

Answer: because there is no displacement or movement in the watchman's work. according to science when displacement or movement take place it is said to be work. hope this helps you.

Answer:

Thank you and please rate me as brainliest as it will help me to level up

Answer:

The height is "89.61 m". A further explanation is given below.

Explanation:

According to the question,

Mass of rocket,

m = 5 kg

Time,

t = 4.6 s

Initial speed of rod

u = o m/s

Final speed,

v = 39 m/s

drag,

= 60 N

So,

⇒ acceleration, [tex]a=\frac{v-u}{t}[/tex]

                              [tex]=\frac{39-0}{4.6}[/tex]

                              [tex]= 8.478 \ m/s^2[/tex]

⇒ [tex]F_{net}= Net \ force[/tex]

           [tex]=ma[/tex]

           [tex]=5\times 8.478[/tex]

           [tex]=42.89 \ N[/tex]

Now,

The thrust will be:

⇒ [tex]Thrust-weight-drag=Net \ force[/tex]

⇒ [tex]Thrust-(5\times 9.8)-60=42.89[/tex]

⇒           [tex]Thrust-49-60=42.89[/tex]

⇒                 [tex]Thrust-109=42.89[/tex]

⇒                           [tex]Thrust=42.89+109[/tex]

⇒                           [tex]Thrust=151.89 \ N[/tex]

The height will be:

⇒ [tex]h=\frac{1}{2} at^2[/tex]

      [tex]=\frac{1}{2}\times 8.47\times (4.6)^2[/tex]

      [tex]=\frac{1}{2}\times 8.47\times 21.16[/tex]

      [tex]=89.61 \ m[/tex]

Answer:

The height of the bridge is 78.4 m.

Explanation:

Given;

time of the stone motion off the bridge, t = 4.0 s

acceleration due to gravity, g = 9.8 m/s²

The height of the bridge is given by;

h = ut + ¹/₂gt²

where;

u is the initial velocity of the stone, u = 0

h = ¹/₂gt²

h = ¹/₂(9.8)(4)²

h = 78.4 m

Therefore, the height of the bridge is 78.4 m.

Answer:

Objects underwater seem closer to the surface than they actually are because light rays from the object bend away from the normal as they pass from water to air making the objects look closer.

Answer:

So 55 Newtons are needed.

Answer:

80 N

Explanation:

mass (m) = 20kg

acceleration (a) = 4m/s^2

Force (F) = ?

.°. F = ma

= 20 × 4 = 80

.°. F = 80 N

Thus, The Force is needed to accelerate a 20 kg mass at a rate of 4 m/s^2 is 80 N

-TheUnknownScientist

Solution :

Given

Diameter of the roulette ball = 30 cm

The speed ball spun at the beginning = 150 rpm

The speed of the ball during a period of 5 seconds = 60 rpm

Therefore, change of speed in 5 seconds = 150 - 60

                                                                      = 90 rpm

Therefore,

90 revolutions in 1 minute

or In 1 minute the ball revolves 90 times

i.e. 1 min = 90 rev

     60 sec = 90 rev

        1 sec = 90/ 60 rec

         5 sec = [tex]$\frac{90}{60}\times 5$[/tex]

                   = 75 rev

Therefore, the ball made 75 revolutions during the 5 seconds.

Answer:

What about Newton's law of gravity.

Explanation:

The one with the apple falling on his head.

Answer:

B. 24.2 m/s

Explanation:

Given;

mass of the roller coaster, m = 450 kg

height of the roller coaster, h = 30 m

The maximum potential energy of the roller coaster  due to its height is given by;

[tex]P.E_{max} = mgh\\\\PE_{max} = 450 *9.8*30\\\\PE_{max} = 132,300 \ J[/tex]

[tex]P.E_{max} = K.E_{max} \ (law \ of \ conservation\ of \ energy)[/tex]

[tex]K.E_{max} = \frac{1}{2}mv_{max}^2\\\\ v_{max}^2 = \frac{2K.E_{max}}{m}\\\\ v_{max}^2 = \frac{2*132300}{450}\\\\ v_{max}^2 =588\\\\v_{max} = \sqrt{588}\\\\ v_{max} = 24.2 \ m/s[/tex]

Therefore, the maximum speed of the roller coaster is 24.2 m/s.

Answer:

1. 24.2 m/s

2. 20.4 m

3. 22.5 m/s

4. 109,375 J

5. It is easy to calculate new scenarios.

Explanation:

5/5 on the Maximum Energy Quick Check

Answer:

What "this"??? Where is it " this"???

Answer:

Explanation:

The question relates to time of flight of a projectile .

Time of flight = 2 u sinθ / g

u is speed of projectile , θ is angle of projectile

= 2 x 48.5 sin42 / 9.8

= 6.6 seconds  .

Maximum height attained

= u² sin²θ / g

= 48.5² sin²42 / 9.8

= 107.47 m .

Answer:

Shouldn't it be 100%

Explanation:

Please explain in the comment section.

Answer:

0.4m/s² to the left

Explanation:

To solve this problem, we must know that;

     Net force  = mass x acceleration

Net force is the resultant force on a body that will act like a single force;

    Force to left  - force to right  = mass x acceleration

                7  - 5  = 5 x acceleration

                  2  = 5 x acceleration

        Acceleration  = [tex]\frac{2}{5}[/tex]   = 0.4m/s² to the left

Answer: it’s A and B

Explanation: everyone else on this post was giving you the wrong answer.

An altering magnetic field will cause an altering electric field, and vice versa. Electromagnetic waves are created from these shifting fields. In contrast to mechanical waves, electromagnetic waves can travel without a medium. Thus option A, B is correct.

The EM wave's magnetic and electric fields are represented by the vectors E and B, respectively. In the case of electromagnetic waves, E and B are always perpendicular to the direction of propagation and to each other.

An oscillating charge generates an oscillating magnetic field, which in turn generates an oscillating electric field in space. As a result, an electromagnetic wave is created by the oscillating electric and magnetic fields that keep regenerating one another.

Therefore, An electric current produces a magnetic field and A moving magnet produces an electric current.

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Answer:

6.0 m/s vertical and 9.0 m/s horizontal

Explanation:

For the vertical component, we use the formula:

Then we solve for y:

And for the horizontal component, we use the formula:

Then we solve for x:

So the answer is " 6.0 m/s vertical and 9.0 m/s horizontal".

Answer:

25.8 m/s

Explanation:

Initial Velocity (u) =?

Final velocity before it starts to fall ; v = 0

Distance (S) = 34 meters

Using the relation :

v² = u² + 2aS

a = - 9.8 m/s²

0 = u² + 2(-9.8)(34)

0 = u² - 666.4

u² = 666.4

u = √666.4

u = 25.814724

Hence, vertical velocity when the rock leaves her hand is 25.8 m/s