Which of the following is a molecule? *
1.He
2.Be
3.NO
4.Na

Answer:

Scoliosis is a sideways curvature of the spine. Scoliosis is a sideways curvature of the spine that occurs most often during the growth spurt just before puberty. While scoliosis can be caused by conditions such as cerebral palsy and muscular dystrophy, the cause of most scoliosis is unknown.

Answer:

.................... protons :)

Answer:

protons

The two subatomic particles that have the same mass are protons and neutrons.

Answer:

Not 500 points I got 18 but thx

Explanation:

Answer:

Acceleration, a = 9.877m/s²

Explanation:

Given the following data;

Distance, d = 400m

Time, t = 9secs

Since it's starting from rest, initial velocity, u = 0

To solve for acceleration, we would use the second equation of motion;

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

Substituting into the values into the equation;

[tex] 400 = 0(9) + \frac {1}{2}a(9)^{2}[/tex]

[tex] 400 = \frac {1}{2}a81[/tex]

Cross multiplying, we have;

[tex] 800 = a81[/tex]

[tex] a = \frac {800}{81}[/tex]

a = 9.877m/s²

Therefore, the automobile would have to accelerate at a constant rate of 9.877m/s²

Answer: -49m/s.

Explanation:

As the rock only falls, we will assume that the initial vertical velocity is zero.

We neglect the air friction, so the only force acting on the rock is the gravitational force, this means that the acceleration is -g = -9.8m/s^2.

Then we can write:

a(t) = -9.8m/s^2

To write the velocity of the rock, we must ingrate over time and get:

v(t) = (-9.8m/s^2)*t + v0

where v0 is the initial vertical velocity, and as we said above, v0 = 0m/s

Then the vertical velocity as a function of time is:

v(t) = (-9.8m/s^2)*t

Now, the question is:

"...If a rock falls for 5 seconds near the surface of the earth and with no air friction, it will reach a velocity of..."

Then we need to evaluate the velocity equation in t = 5 seconds.

v(5s) = (-9.8m/s^2)*5s = -49m/s.

Answer:

0.40km/h

I think.. Hope this helps <3

Answer:

the causes of season change on the earth is due to the tilted axis

Answer:

The mass number of an atom is its total number of protons and neutrons. Atoms of different elements usually have different mass numbers , but they can be the same. For example, the mass number of argon atoms and calcium atoms can both be 40.

Explanation:

Please mark as brainliest

Answer:

Explanation:

atomic mass

Answer:

The velocity of the droplet right before it hits the ground is 40.08 m/s.

Explanation:

To determine the velocity of the droplet right before it hits the ground,

From one of the equations of kinematic for free fall motions,

v = u + gt

Where v is the final velocity

u is the initial velocity

g is acceleration due to gravity (take g = 9.8 m/s²)

and t is time

For the question, v is the velocity of the droplet right before it hits the ground.

u = 0 m/s (Since the molten lead was dropped from rest)

Therefore,

v = gt

First, we will determine the time t

Also, from one of the equations of kinematic for free fall motions,

h = ut + 1/2(gt²)

u = 0 m/s

From the question, the molten lead was dropped from the top of the 82.15 m tall tower, therefore

h = 82.15

Hence,

82.15 = 0×t + 1/2 (9.8 × t²)

82.15 = 1/2 (9.8 × t²)

82.15 = 4.9 t²

t² = 82.15/4.9

∴ t = 4.09 secs

Now, for the velocity v, of the droplet right before it hits the ground,

Recall

v = gt

Then,

v = 9.8 × 4.09

v = 40.08 m/s

Hence, the velocity of the droplet right before it hits the ground is 40.08 m/s.

Answer:

Sagittarius A

At its center, surrounded by 200-400 billion stars and undetectable to the human eye and by direct measurements, lies a supermassive black hole called Sagittarius A*, or Sgr A* for short. The Milky Way has the shape of a spiral and rotates around its center, with long curling arms surrounding a slightly bulging disk.

Explanation:

Answer:

black hole is the answer

Explanation:

Answer:

Before stopping, the van travels 42.5 m

Explanation:

Constant Acceleration Motion

It's a type of motion in which the velocity of an object changes by an equal amount in every equal period of time.

Being a the constant acceleration, vo the initial speed, vf the final speed, and t the time, the following relation applies:

[tex]v_f=v_o+at\qquad\qquad [1][/tex]

The distance traveled by the object is given by:

[tex]\displaystyle x=v_o.t+\frac{a.t^2}{2}\qquad\qquad [2][/tex]

The van slows down uniformly from v0=17 m/s to vf=0 m/s in t=5 s. The acceleration can be calculated by solving [1] for a:

[tex]\displaystyle a=\frac{v_f-v_o}{t}[/tex]

[tex]\displaystyle a=\frac{0-17}{5}=-3.4\ m/s^2[/tex]

The distance covered is:

[tex]\displaystyle x=17\cdot 5+\frac{(-3.4)\cdot 5^2}{2}[/tex]

[tex]\displaystyle x=85-42.5=42.5[/tex]

Before stopping, the van travels 42.5 m

Answer:

horizontal and vertical motion

Explanation:

By definition, a projectile has a single force that acts upon it - the force of gravity. If there were any other force acting upon an object, then that object would not be a projectile. Thus, the free-body diagram of a projectile would show a single force acting downwards and labeled force of gravity (or simply F^grav).

Answer:

A

Explanation:

wavelength can be obtained by speed of the wave divided by its frequency

[tex] \frac{343}{330} [/tex]

1.04m

Answer:

Correct answer - A) 1.04 m

Explanation: just did the quiz

Answer:

Explanation:

Time of fall be t

Considering downward fall

h = 1/2 g t²

.8 = .5 x 9.8 t²

t² = .16

t = .4 s

Marble lands at .6 m away from the base

If u be its horizontal initial velocity

u x .4 = .6

u = 1.5 m /s .

The initial velocity of the marble will be "1.5 m/s".

According to the question,

Height of table, h = 0.8 m

Marble lands = 0.6 m

Acceleration due to gravity, g = 9.8

Let,

The time of fall be "t".

We know the relation,

→ h = [tex]\frac{1}{2} gt^2[/tex]

By substituting the values, we get

0.8 = 0.5 × 9.8 t²

  t² = 0.16

    t = √0.16

      = 0.4 s

hence,

The horizontal initial velocity will be:

→ u × 0.4 = 0.6

            u = [tex]\frac{0.6}{0.4}[/tex]

               = 1.5 m/s

Thus the answer above is appropriate.    

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Answer:

a

Explanation:

Answer: C. Trial 3

Explanation:

Trial 1 and 2 equal 1.5, Trial 3 equals 1 and Trial 4 equals 3. Trial 3 is the smallest current .

The trial for which the students would measure the smallest current is the circuit is trial 2 and trial 3.

To know the trial which generates the smallest current, we need to determine the current in each trial.

Since current I = V/R where V = voltage and R = resistance.

For trial 1, V = 1.5 V and R = 200 Ω

So, I = 1.5 V/200 Ω

= 0.0075 A

= 7.5 mA

For trial 2, V = 1.5 V and R = 100 Ω

So, I = 1.5 V/100 Ω

= 0.015 A

= 15 mA

For trial 3, V = 3 V and R = 200 Ω

So, I = 3 V/200 Ω

= 0.015 A

= 15 mA

For trial 4, V = 3 V and R = 100 Ω

So, I = 3 V/100 Ω

= 0.03 A

= 3 mA

Trial 2 and trial 3 both produce a the smallest current of 15 mA.

So, the trial for which the students would measure the smallest current is the circuit is trial 2 and trial 3.

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Answer:

28 seconds.

Explanation:

Apply the first equation of motion as;

v=u +at where;

v= final velocity of the plane = 70m/s

u=initial velocity of the plane= 0m/s -----it was at rest

a= acceleration uniform =2.5 m/s²

t= time required for takeoff = ?

Substitute values in the equation as;

v= u + at

70 = 0 + 2.5*t

70 = 2.5t

70/2.5 = 2.5/2.5t

28 = t

Time required for takeoff is 28 seconds.

Answer:

Option C. 0.51 m/s² to the right.

Explanation:

We'll begin by calculating the net force acting on the skateboarder. This is illustrated below:

Force applied (Fₐ) = 52.8 N

Force resistance (Fᵣ) = 11.4 N

Net force (Fₙ) =.?

Net force (Fₙ) = Force applied (Fₐ) – Force resistance (Fᵣ)

Fₙ = Fₐ – Fᵣ

Fₙ = 52.8 – 11.4

Fₙ = 41.4 N to the right

Thus, the net force acting on the skateboarder is 41.4 N to the right.

Finally, we shall determine the acceleration of the skateboarder as shown below:

Mass (m) = 81.5 kg.

Net force (Fₙ) = 41.4 N to the right

Acceleration (a) =..?

Net force (Fₙ) = mass (m) × acceleration (a)

Fₙ = ma

41.4 = 81.5 × a

Divide both side by 81.5

a = 41.4 / 81.5

a = 0.51 m/s² to the right.

Therefore, the acceleration of the skateboarder is 0.51 m/s² to the right.

Answer: .5 m/s to right

Explanation:

The ball rolled for 13.2 s

Speed is scalar and no direction

[tex]\tt avg~speed=\dfrac{total~distance}{elapsed~time}=\dfrac{\Delta x}{\Delta t}[/tex]

A bowling ball rolls 33 m, with average speed = 2.5 m/s

So elapsed time :

[tex]\tt t=\dfrac{33~m}{2.5`m/s}=13.2~s[/tex]

Answer:

13.2

Explanation:

Answer: I hope you have a great day. And I hope this helps.

Explanation: Scientific ideas don't need to be resourced in a book: For example, they need to be published in a peer-reviewed journal.

Furthermore, public favoring is not material: global warming is accepted in the scientific community despite a lack of popular favoring.

The correct answer is: They are new ideas. (and once they're accepted they can become laws).

Answer:

benefits

Diversifying energy supply and reducing dependence on imported fuels.

Creating economic development and jobs in manufacturing, installation, and more.

drawbacks

Large areas of landfill are required

Hydroelectric power is generated from flowing water, which turns turbines and generates electricity

Explanation:

The Answer is particle Z

Answer:

answer is D

Explanation:

Answer:

north of 66.5 degrees latitude;90 degrees minus and filt of earth axis receive 24 hrs of sunlight

Answer:

true

Explanation:

hope I helped a bit

Electricity needs a path to follow to get from one destination to another. And the journey is always the same: Power – Electricity always starts from a source, like a battery or an outlet.

"A battery is a device that converts chemical energy contained within its active materials directly into electric energy by means of an electrochemical oxidation-reduction (redox) reaction. This type of reaction involves the transfer of electrons from one material to another via an electric circuit."

"In electronics, a circuit is a complete circular path that electricity flows through. A simple circuit consists of a current source, conductors and a load. The term circuit can be used in a general sense to refer to any fixed path that electricity, data or a signal can travel through."

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Answer:

The answer is A) True

Explanation:

Uranium is the fuel most widely used by nuclear plants for nuclear fission. Uranium is considered a nonrenewable energy source, even though it is a common metal found in rocks worldwide. Nuclear power plants use a certain kind of uranium, referred to as U-235, for fuel because its atoms are easily split apart.

Answer:

The force that the book exerts down on the table is equal to the force the table exerts upward.

Explanation:

I am 100% positive. That results in balanced forces which is why it does not move. If you did want it to move, you would apply unbalanced forces.

Answer:

4th: "The force that the book exerts down on the table is equal to the force the table exerts upward"

Explanation:

Basically, a book on a table is balanced in terms of forces. Gravity is opposed by the table and there are no forces acting to move the book in any direction. If there was a breeze that was not strong enough to move the book, it is because the force of friction is equal to that provided by the breeze.

Answer:

Explanation:

In free fall, gravity constantly accelerates an object (increases its velocity)—until it hits terminal velocity. Specifically, gravity increases a falling object's velocity by 9.8 meters per second (m/s) with every passing second. (Whereas velocity is measured in m/s, acceleration is measured in meters per second squared, or m/s2.) How does this constant acceleration affect the distance that an object travels over time? In this experiment you will roll a marble down a ramp to find out.

By adjusting the ramp's height, width, or inclination, you can increase the velocity at which the marble travels down it.

As a tool for lifting or lowering a load, an inclined plane, sometimes referred to as a ramp, is a flat supporting surface that is tilted at an angle from the vertical direction with one end higher than the other.

One of the six traditional simple devices that Renaissance scientists defined is the inclined plane. Heavy weights are transported over vertical obstacles using inclined planes. Examples include a ramp used to load cargo into a truck, a pedestrian ascending a ramp, or an automobile or train ascending an incline.

Less force is needed to push an object up an inclined plane than to lift it straight up, but the distance travelled is greater.

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Answer: Explanation:

Balloons are elastic and store potential energy when they are filled with air. When the air is released, the potential energy is converted into the energy of motion, which is also known as kinetic energy. This is the energy you see when the car is propelled forward.