HURRY PLS IM IN NEED. Question 14 of 16
Which chemical equation represents a synthesis reaction?
O A. 2Na+ MgCl2 - 2NaCl + Mg
B. C+02 - CO2
C. H2CO3 - H2O + CO2
OD. HCI + LiOH
LiCl + H20

Answer:

Concave mirrors reflect light to a central point (converging)

Suppose the source is to the left of the  mirror in  question.

Parallel rays into the mirror are always reflected towards the focal point.

In the case of a concave mirror the real parallel rays pass thru the focal point.

If the mirror is convex the rays will diverge to the left and act as if they were emanating from the focal point to the right of the mirror.

Answer:

Wow, thank you so much! I hope you have a great day!

Answer:

37.5 seconds

Explanation:

The given parameters are;

The mass of the block on the spring, m = 2.50 kg

The force with which the loaded spring launches the block, F = 450 N

The change in momentum of the block, Δp = 12.0 kg·m/s

We have;

Let the force with which the block was launched = The net force, [tex]F_{NET}[/tex]

By Newton's second law of motion, we have;

F = [tex]F_{NET}[/tex] = Δp × Δt

Where;

Δt = The time the block is in contact with the spring

Therefore;

[tex]\Delta t = \dfrac{F_{NET}}{\Delta p}[/tex]

By plugging in the values for [tex]F_{NET}[/tex] and Δp, we have;

[tex]\Delta t = \dfrac{450 \ N}{12.0 \ kg \cdot m/s} = 37.5 \ s[/tex]

The time duration the block is in contact with the spring, Δt = 37.5 seconds.

Answer: 24.39 N

Explanation:

Given

Torque required to open the lid is [tex]\tau =2\ N.m[/tex]

diameter of lid [tex]d=8.2\ cm[/tex]

Force exerted by fingers and thumb forms a couple. So, torque can be written as

[tex]\Rightarrow \tau= F\times 2r\\\Rightarrow 2=F\times 8.2\times 10^{-2}\\\\\Rightarrow F=\dfrac{200}{8.2}\\\\\Rightarrow F=24.39\ N[/tex]

Thus, the magnitue of each force is 24.39 N

Answer:

(1) Support

(2) Tension

(3) Reaction

The constraint forces are forces that occur in pairs such that the net force (effect) is zero

The details of the constraint forces are;

(1) The support force at the top of the swing acting upwards

(2) The tension in the swing rope acting upwards

(3) The (normal) reaction between the legs of the swing frame and the ground

Explanation:

The normal reaction is the force equal in magnitude and opposite in direction to the total weight force the swing and the person on the swing posses due to gravitational attraction which prevents the downward or sideways motion of the entire swing

Answer:

5

Explanation:

If you straighten out the line, it touches the 5, which makes the length 5

Answer: gravity

normal force

friction

Explanation:

A force is refered to as the interaction which when unopposed, will lead to a change in an objects motion. The velocity of an object will be changed when force is applied.

Since Alisa s riding down a hill and she and the skateboard are considered to be a single object, then the forces that are acting on her include gravity, normal force and friction.

Answer:

Explanation:

I'm assuming your charge is in Coulombs so I will proceed that way. The formula for this electric field problem is

[tex]E=\frac{kQ}{r^2}[/tex] where k = 9.0 × 10⁹. Filling in:

[tex]E=\frac{(9.0*10^9)(1.25*10^{-3})}{.4^2}[/tex] gives us an electric field value of

7.0 × 10⁷ N/C

Answer:

Input force of pulley system = 200 N

Explanation:

Given:

Mechanical advantage of pulley system = 5

Output force from pulley system = 1,000 N

Find;

Input force of pulley system

Computation:

Mechanical advantage = Output force / Input force

Mechanical advantage of pulley system = Output force from pulley system / Input force of pulley system

5 = 1,000 / Input force of pulley system

Input force of pulley system = 1,000 / 5

Input force of pulley system = 200 N

Answer:

8.5 Ω

Explanation:

La resistencia de un material es directamente proporcional a su longitud e inversamente proporcional al área de la sección transversal.

La fórmula de la resistencia (R) viene dada por:

R = ρL/A

Donde ρ es la resistividad del material, L es la longitud del material y A es el área de la sección transversal del material.

Dado que:

L = 1 km = 1000 m, A = 2 mm² = 2 * 10⁻⁶ m², ρ (cobre) = 1.7 * 10⁻⁸ Ωm

Sustituyendo da:

R = 1,7 * 10⁻⁸ * 1000/2 * 10⁻⁶

R = 8.5 Ω

Answer:

Explanation:

The only thing I can figure you need here is the accleration of the sled. The equation we need to find this is Newton's Second Law that says that sum of the forces acting on an object is equal to the object's mass times its acceleration. For us, that looks like this because of the friction working against the sled:

F - f = ma but of course it's much more involved than that simple equation! We have the F value as 230 N, and we have the mass as 105, but we do not have the frictional force, f, and we need it to solve for a in the above equation. We know that

f = μ[tex]F_n[/tex] where μ is the coefficient of friction, and [tex]F_n[/tex] is the normal force, aka weight of the object. We will use the coefficient of friction and find the weight in order to fill in for f:

[tex]F_n=mg[/tex] so

[tex]F_n=(105)(9.8)[/tex] so the weight of the sled is

[tex]F_n=[/tex] 1.0 × 10³ with the correct number of sig dig there. Now to find f:

f = (.025)(1.0 × 10³) so

f = 25 to the correct number of sig fig. Now on to our "real" equation:

F - f = ma and

230 - 25 = 105a. We have to do the subtraction first, round, and then divide since the rules for addition and subtraction are different from the rules for dividing and multiplying.

230 - 25 will round to the tens place giving us 210. Then

210 = 105a. 210 has 2 sig figs in it while 105 has 3, so we will divide and round to 2 sig fig:

a = 2.0 m/sec²

Answer:

Mean radius of earth = 6.37E6 meters

Orbital radius = .569E6 meters

Total radius = (6.37 + .57) * 10^6 m = 6.94E6 m

P = S / t = 2 * pi * 6.94E6 / 7.75E3 sec = 5630 sec = 93.8 min

Answer:

When conducting research, scientists use the scientific method to collect measurable, empirical evidence in an experiment related to a hypothesis (often in the form of an if/then statement), the results aiming to support or contradict a theory.

I HOPE ITS RIGHT

The process of scientific methods involves making inferences, deriving predictions from hypotheses as logical consequences, and conducting experiments or empirical observations based on those predictions.

When conducting research, scientists use scientific methods to experiment with hypotheses (often in the form of if-then statements) aimed at supporting or disproving the scientific theory. Collect empirical evidence.

The six steps of the scientific method are

1) asking about what you are observing,

2) doing background research to learn what is already known about the subject,

3) making hypotheses, and

4). Experiment with a hypothesis, 5) analyze data

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Answer:

[tex]{ \bf{average \: velocity = \frac{15 + 40}{2}}} \\ = 27.5 \: {ms}^{ - 1} \\ { \bf{acceleration = \frac{v - u}{t} }} \\ = \frac{40 - 15}{10} \\ = 2.5 \: {ms}^{ - 2} \\ \\ { \tt{second \: qn : }} \\ { \bf{final \: velocity =u + at }} \\ v = 0 + (5 \times 10) \\ = 50 \: {ms}^{ - 1} [/tex]

Answer:

Its B, observe weather the colliding objects change their shape .

Explanation:

I hope this will help you, if not so advance sorry :)

HERE'S YOUR ANSWER

Explanation:

Antimatter is a material composed of so-called antiparticles. It is believed that every particle we know of has an antimatter companion that is virtually identical to itself, but with the opposite charge. For example, an electron has a negative charge.

Answer:

 U = 25 J

Explanation:

The energy in a set of charges is given by

          U = [tex]k \sum \frac{q_i}{r_i}[/tex]

in this case we have three charges of equal magnitude

          q = q₁ = q₂ = q₃

with the configuration of an equilateral triangle all distances are worth

          d = a

          U = k ( [tex]\frac{q_1q_2}{ r_1_2 } + \frac{q_1q_3}{r_1_3} + \frac{q_2q_3}{r_2_3}[/tex] )

we substitute

           15 = k q² (3 / a)

            k q² /a = 5

For the second configuration a load is moved to the measured point of the other two

          d₁₃ = a

The distance to charge 2 that is at the midpoint of the other two is

          d₁₂ = d₂₃ = a / 2

           U = k (\frac{q_1q_2}{ r_1_2 } + \frac{q_1q_3}{r_1_3} + \frac{q_2q_3}{r_2_3})

            U = k q² (  [tex]\frac{2}{a} + \frac{1}{a} + \frac{2}{a}[/tex] )

            U = (kq² /a) 5

substituting

            U = 5 5

            U = 25 J

Answer:

890 N

Explanation:

Given the following data;

Height = 3 m

Potential energy = 2670 J

To find the force weight;

We know that force = weight = mg

Potential energy can be defined as an energy possessed by an object or body due to its position.

Mathematically, potential energy is given by the formula;

[tex] P.E = mgh[/tex]

Where,

P.E represents potential energy measured in Joules.

m represents the mass of an object.

g represents acceleration due to gravity measured in meters per seconds square.

h represents the height measured in meters.

Substituting into the formula, we have;

2670 = mg*3

mg = 2670/3

mg = 890 N

Therefore, the force weight (mg) is equal to 890 Newton.

First of all, what a weight is? weight is m × g.. and when a person is in space then the force of gravity isn't acting on him or her, so yeah it will not have weight, but remember gravity is a very very low, now if a body has more mass, more gravity will act on it right? just imagine the mass of a person and that of earth.. now yes, earth will do exert a force on the astronaut but is negiligable.

Kinetic energy is the energy which a body possesses by virtue of being in motion. Thus, kinetic energy is the energy of motion.

In physics, an object's kinetic energy is the energy it has as a result of its motion. It is defined as the amount of work required to accelerate a body of a given mass from rest to a given velocity. The standard unit of kinetic energy is the joule. Kinetic energy is a property of a moving object or particle and depends not only on its motion but also on its mass.

The body retains its kinetic energy after gaining it during acceleration unless its speed changes. The body does the same amount of work when slowing down from its current speed to rest.

Therefore, kinetic energy is the energy of motion.

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Answer:

Biodiversity is the biological variety and variability of life on Earth. Biodiversity is a measure of variation at the genetic, species, and ecosystem level. Terrestrial biodiversity is usually greater near the equator, which is the result of the warm climate and high primary productivity.

Answer:

Bio means life

Explanation:

Biodiversity means life on earth.

Answer:

Explanation:

The formula for the magnitude of a vector is

[tex]B_{mag}=\sqrt{(-1.33)^2+(2.81)^2}[/tex] and then round to the hundredths place:

3.11 m. Since we are in Q2, we can also find the direction of this vector:

[tex]tan^{-1}(\frac{2.81}{-1.33})=-64.7[/tex] but since we are in Q2, we add 180 degrees to the result, getting the angle to be 115.3

Answer:115.33

Explanation:

Answer:

Its gravitational potential energy must increase.

Explanation:

Conservation of Mechanical Energy

The total amount of mechanical energy, in a closed system in the absence of dissipative forces like friction or air resistance, remains constant.

This means that energy cannot disappear or appear and that potential energy can become kinetic energy or vice versa.

In a closed system like a pendulum, two types of energies are considered: Gravitational potential (U) and kinetic (K). Thus, the sum of both energies must remain constant in time.

Suppose the pendulum is at a state where U=150 J, and K=350 J. The total mechanical energy is:

M = 150 J + 350 J = 500 J

If the kinetic energy decreases to a new value, say K = 200 J, then the gravitational potential must increase to compensate for this new condition, that is: U = 300 J

So, It's gravitational potencial energy must increase

Hope it helps you I'm from ph :)

Answer: 43.7

Explanation: Simply round the number so that there are only three digits in the number.

We have that 43.659 rounded to three significant digits is

[tex]43.659=43.7[/tex]

From the Question we are Given

Integer=43.659

To round off to three significant digits means to represent only three digits

Therefore

43.659 in  three digits is

[tex]43.659=43.7[/tex]

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Answer:

t=10.95 seg

Explanation:

The vertical component of velocity is 0, so, the time in air can be calculated

[tex]h=v_ot-\frac{1}{2}gt^2\\\\h=0-\frac{1}{2}gt^2~=>t=\sqrt{2gh}=\sqrt{2*10\frac{m}{s^2}*6m}=10.9544~seg[/tex]

Answer:

Sentence III

Explanation:

I. It takes positive work to bring like charges together.

Using Coulom law we know that like charges will feel a repulsion force that meen that if we want to put them together we are going againt the force, this means we need a negative work. So is False.

II. Electric field lines always point in the direction of decreasing electric potential.

The elctrical fiels depend on the charge of the particle. So if the particle is positive the field will point always outwart the charge, and if the particle is negative, the electric field will point to the charge. Also, we know that the potential is bigger clouser to the charge, so this sentence is folce when we have a negative charge. So is False.

III. If a negative charge moves in the direction of the electric field, its potential energy decreases

If a negative particle move in the direction of the elctric field in bout cases the potential will decrease. If we have a positive charge the electron will be atracted by the field, How ever the electric fild is pointing in the other direction, for that reason will decrease.