What is the acceleration of the box?

Answer:

D. Energy in an isolated system remains constant

Explanation:

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The statement "Energy in an isolated system remains constant" is correct which is based on the law of conservation of energy option (D) is correct.

The law conservation of energy can be defined as the energy that cannot be created either it cannot be destroyed it only can change from one state to another state.

As we know, from the definition of the law of conservation of energy,

The energy that cannot be created either cannot be destroyed.

According to the rule of conservation of energy, the energy in an isolated system doesn't change.

Thus, the statement "Energy in an isolated system remains constant" is correct which is based on the law of conservation of energy option (D) is correct.

Learn more about the law of conservation of energy here:

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Complete question

A cannon with a muzzle velocity of 500. meters per second fires a cannonball at an angle of 30.° above the horizontal. What is the vertical component of the cannonball's velocity as it leaves the cannon?

A   0.0 m/s

B    250. m/s

C   433 m/s

D    500. m/s

Answer:

The correct option is  C

Explanation:

From the question we are told that

   The velocity is  [tex]v = 500 \ m/s[/tex]

    The angle is  [tex]\theta = 30^o[/tex]

Generally the vertical component of the canon ball is mathematically represented as  

          [tex]v_y = v * cos (30 )[/tex]

=>       [tex]v_y = 500 * cos (30 )[/tex]

=>       [tex]v_y = 433 \ m/s[/tex]

Answer:

250. m/s

Explanation:

It is vertical component so you do: 500mSin(30°) = 250m/s

Answer:

1275J

Explanation:

Given parameters:

Force on box  = 85N

Distance moved  = 15m

Unknown:

Work done  = ?

Solution:

Work done is the amount of force applied on a body to move it through a specific distance.

 Work done  = Force x distance

Now insert the parameters and solve;

 Work done = 85 x 15  = 1275J

Answer:

They are made of one type of atom.

Explanation:

Answer:

The answer is A

Explanation:

Answer:

Explanation:

The mass of the train can be found by using the formula

[tex]m = \frac{2k}{ {v}^{2} } \\ [/tex]

k is the kinetic energy

v is the velocity

From the question we have

[tex]m \frac{2(2000000)}{ {20}^{2} } = \frac{4000000}{400} = \frac{40000}{4} \\ [/tex]

We have the final answer as

Hope this helps you

Answer:

10,000 kg

Explanation:

.

Answer:

newtons 3rd law

Explanation:

newtons thirs law states for every action there is an equal and opposite reaction.

Answer:

Newton Third law states that for every action there is an equal and opposite reaction

Answer:

A.C. Generator

Explanation:

The device designed to convert chemical energy into kinetic energy is an A.C generator.

The generator uses fuel to cause the mechanical motion of the pistons in the device.

Answer: 100

Explanation:

Answer:

sound vibration of spicker

Answer:

air above a wild fire

Explanation:

the type of current formed in the pot is referred to as a convectional current which forms when the heated fluid rises making the cool fluid descend the same happens with the air above a wildfire a convectional current will form when the warm air rises and the cool air descends.the main reason for tge descending and ascending is that the air or liquid closest to the source of heat will get heated making it lighter but the air or liquid tgat was further from the source of heat will not be as light so as the warm fluid rises, the cool fluid descends.

Answer:

air above a wildfire

Explanation

Answer:

58 g

Explanation:

Momentum = mass* velocity

P=mv

P= 1.06 kg*m/s

M=?

V=18 m/s

1.06 kg*m/s=m(18m/s)

M=0.058 kg

0.058kg = 58 g

Answer:

59

Explanation:

edge 2021

Answer:

When a underground suddenly breaks along a fault it cause vibration it is called earthquake.

The Sun light is reflected back by earth. On process of reflecting back the sunlight, the lower layer of troposphere absorbs the most sunlight and upper layer absorbs the least sunlight. So when We ascend to troposphere, we move towards the upper layer of troposphere where sunlight is least absorbed and is colder than lower layer where sunlight is most absorbed

  In the troposphere, the temperature generally decreases with altitude. The reason is that the troposphere's gases absorb very little of the incoming solar radiation. Instead, the ground absorbs this radiation and then heats the tropospheric air by conduction and convection.

Answer:

heart rate increases during activity

Explanation:

You can work at 70 to 85 percent of your maximum heart rate during vigorous activity.

Answer:

because the presure it puts on your body same as if you go to deep in the water

Answer:

V₂ = 19 [m/s]

Explanation:

The final linear momentum will be equal to the sum of the initial momentum plus the momentum received.  By means of the following equation, we can determine the final momentum.

[tex]m_{1}*v_{1} + IMP_{1-2} = m_{2}*v_{2}[/tex]

where:

m₁ = m₂ = mass = 30 [kg]

v₁ = velocity = 11 [m/s]

IMP₁-₂ = 240 [kg*m/s]

v₂ = final velocity [m/s]

[tex](30*11) + 240 = 30*V_{2}\\330 + 240 = 30*V_{2}\\v_{2}=19 [m/s][/tex]

The final velocity of the object is 19 m/s

The impulse is given by:

Impulse = m(v - u)

where m is the mass, v is the final velocity and u is the initial velocity.

Given that impulse = 240 kgm/s, u = 11 m/s, m = 30 kg. Hence:

Impulse = m(v - u)

240 = 30(v - 11)

8 = v - 11

v = 19 m/s

The final velocity of the object is 19 m/s

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Answer:

2500kgm/s

Explanation:

Change in momentum is equal to impulse, numerically.

Ft=m( v-u)

But he begins from rest so u= 0

Then

Ft= mv

500(5)=mv

2500= mv

Answer:

F = 845 [N]

Explanation:

To solve this problem we must use the following equation of kinematics.

[tex]v_{f} ^{2} =v_{o} ^{2} +2*a*x[/tex]

where:

Vf = final velocity = 26 [m/s]

Vo = initial velocity = 0

a = acceleration [m/s²]

x = distance = 2.8[m]

[tex]26^{2} = 0 +(2*a*2.8) \\5.6*a = 676\\a = 120.71[m/s^{2}][/tex]

Now we have to use Newton's second law which tells us that force is equal to the product of mass by acceleration.

ΣF = m*a

where:

F = force [N]

m = mass = 7 [kg]

a = acceleration = 120.71 [m/s²]

[tex]F = 7*120.71\\F = 845 [N][/tex]

Answer:

It's A

As the Gizmo shows, the Moon orbits at an angle relative to the plane of Earth's orbit. Usually, the Moon is above or below the Earth when an eclipse could happen. Every six months or so, the Moon, Earth and Sun are lined up sufficiently to create a lunar and a solar eclipse.

Answer:

A

Explanation:

The Moon's orbit is tilted relative to the plane of the Earth's orbit. About every six months, the Sun, Moon and Earth are aligned enough for a solar and a lunar eclipse to occur.

Answer:

In physical changes no new materials are formed and the particles do not change apart from gaining or losing energy. ... Particles stay the same unless there is a chemical change whether the matter is solid, liquid or gas. Only their arrangement, energy and movement changes.

Explanation:

this is true because if you think about it if you put a pill in a glass of water it dissolves its like particles

Answer:

are due to the fact that the electrons that are in one of the objects get close to electrons that are in the other object and since it has the same charge, inte

Explanation:

The contact forces, such as friction or the push force, are due to the fact that the electrons that are in one of the objects get close to electrons that are in the other object and since it has the same charge, intense repuesive forces are formed that objects move. We can see that in these forces the electrons are still attached to the material and only electoral repulsion is what creates the force.

In the previous explanation, it is valid for all types of material, the only change occurs due to the strength of the bond, in the case of materials with free electrons, such as metals, the forces are small, so the sliding occurs for small bourgeois

In insulating materials such as rubber where the electronons are tightly bound, closer proximity is needed to move the electrons from their equilibrium position.

Answer:

24m

Explanation:

Given parameters:

Initial velocity  = 0m/s

Acceleration  = 3m/s²

Time  = 4s

Unknown:

Distance covered  = ?

Solution:

To solve this problem, we apply the right motion equation:

             S = ut + [tex]\frac{1}{2}[/tex]at²

S is the distance

u is the initial velocity

t is the time taken

a is the acceleration;

        S  = (0 x 4) +  [tex]\frac{1}{2}[/tex] x 3 x 4²  

        S = 24m

Answer:

When the Earth and sun are perfectly lined up, then it will happen. They can tell when it's going to happen.

Explanation:

This is why it only happens in some places. Some days it's not sunny out, so it's not going to happen.

Answer:

sorry don't know i just need points

Explanation:

Answer:

60.18 N

Explanation:

Given that:

The force applied on the sled = 100 N

Suppose, the angle between the sled rope and the ground = 53°

The horizontal force which acts  in the horizontal direction can be expressed as:

[tex]F_x = F \ cos \theta[/tex]

[tex]F_x = 100 \ cos (53)[/tex]

[tex]F_x = 60.18 \ N[/tex]

But if the angle between the sled rope is parallel to the ground. Then, we use an angle on a straight line which is = 180°

[tex]F_x = F \ cos \theta[/tex]

[tex]F_x = 100 \ cos (180)[/tex]

= 100 × -1

= -100 N