In order to lift the crate, the forklift had to apply force that was greater than force of gravity affecting the crate.

Answer: Choice 1

Law of Reflection

Theta(i)=Theta(r)

Angle of incidence=Angle of reflection

Which describes the law of reflection?

The laws of reflection are, the incident ray, the reflected ray and the normal to the reflection surface at the point of the incidence are lie in the same plane. The reflected ray and the incident ray are on the opposite sides of the normal.

The law of reflection states that when a ray of light reflects off a surface, then the angle of incidence is equal to the angle of reflection.  Light is known to behave in a very predictable manner.

In the diagram the ray of light that approaching the mirror is known as the incident ray (labeled I), whereas the ray of light that leaves the mirror is known as the reflected ray (labeled R) .

Grade:  9

Subject:  physics

Chapter:  reflection

Keywords:   the law of reflection, reflection, incidence, the angle of incidence, angle

Answer:

the answer is    . d

Explanation:

the answer is A.Statute

the correct answer is 480nm

Answer:

D: 480

Explanation:

Answer:

It acts in the direction opposite of motion.

Explanation:

The sliding friction is the one offering resistance to motion of the sliding cereal box.This force is created between the box and the tabletop that are sliding against each other.The sliding friction is proportional to the weight of the cereal box when pushed on the horizontal tabletop.We can apply the Newton's second law of motion to describe this motion, where force is a product of mass and acceleration.When the object is massive, the sliding friction force experienced is high thus sliding happens slowly.

Answer:

-3 because its closer to 0

Explanation:

Answer:

-3

Explanation:

Because -3 is closer to 0 the closer you are to 0 in negative numbers the higher the number is

Answer:

B

Explanation:

MOST elements on the periodic table are metals.

Answer:B

Answer:The factor that is most likely affecting Thomas's body composition is genetics. Heredity influences the amount of fat a person possesses, and children with heavyset parents are more likely to be heavyset.

Explanation:

sample response

The factor that is affecting his body composition is genetic makeup.

The body composition of an individual is the percentage of the body that is made up of fat, bone and muscles.

The percentage of each component found in an individual is determined by the following factors:

The deoxyribonucleic acid (DNA) of an individual can either have little or much effect on the body composition.

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Answer: D

Explanation:

Based on the balanced equation of the reaction, the coefficients of the balanced equation are as follows; 2, 3, 6 and 1., option D.

The balanced equation of the reaction between aluminium bromide and potassium sulfateis given below:

2AlBr3 + 3 K2SO4 → 6KBr + Al2(SO4)3

Therefore, the coefficients of the balanced equation are as follows; 2, 3, 6 and 1.

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It transforms into heat and gets dissipated to the surroundings in the natural way of moving from hot locations to cooler ones.

The answer is D, Mesopelagic.

The ocean zone that has the most sunlight is Mesopelagic. The correct option is D.

The Mesopelagic zone is a scope of sea depth that beginnings from 650 feet beneath the water's surface to around 3,280 feet underneath. Light entrances from the outer layer of the sea almost scatter at this area. The most widely recognized organic entities found in the mesopelagic zone are little fish, squid, and basic shellfish.

This region receives most of the sunlight.

Thus, the correct option is D.

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Answer:

To demonstrate that an electric current (i.e., moving electric charge) generates a magnetic field, all you need do is simply place a magnetic compass next to a wire in a circuit. When current is passed through the wire, the compass will deflect, indicating the presence of a magnetic field circling the wire.

Explanation:

Electric field is always associated with magnetic field.

Explanation:

Relationship between electric and magnetic fields can be explained by the following example. Consider a wire and a magnetic compass placed close together.

When current is flowing through the wire, the needle in the magnetic compass will deflect showing some value indicating the presence of magnetic field during the experiment. This indicates that the electric field is generally accompanied with the magnetic field.

Answer:

Glucose and Oxygen

Explanation:

Cellular respiration is the process whereby cells derives energy by the use of glucose and oxygen.

Organisms that use cellular respiration to produce their energy are known as heterotophs. They derive the glucose from food materials obtained from plant sources. They use the oxygen from the environment to liberate energy from the glucose obtained from feeding on plant materials.

Cellular respiration can be simply expressed as shown below:

GLUCOSE + OXYGEN → CO₂ + H₂O + ATP

The reactants are glucose and oxygen.

The products are CO₂, water and ATP

The reactants of cellular respiration are oxygen and glucose. These substances combine in a process that takes place in the mitochondria, ultimately producing ATP alongside waste products carbon dioxide, and water.

Cellular respiration is a fundamental metabolic process that occurs in the cells of organisms to produce energy. The reactants of cellular respiration are oxygen and glucose. Oxygen is taken into the body through the process of breathing, and glucose enters the body via the food organisms eat. These reactants are essential for the production of adenosine triphosphate (ATP), the energy currency of cells.

The equation for cellular respiration can be represented as follows: C6H12O6 + 6O2 → 6CO2 + 6H2O + Energy. This indicates that one molecule of glucose (C6H12O6) and six molecules of oxygen (O2) are transformed into six molecules of carbon dioxide (CO2) and six molecules of water (H2O), releasing energy in the process.

The main product of cellular respiration is ATP, which is generated from the energy released during the conversion of glucose and oxygen into carbon dioxide and water. The waste products, carbon dioxide and water, are byproducts of this reaction.

the formation of a standing wave requires interferencethe incoming and reflected waves of the same frequency

Answer: The correct answer is "interference between the incoming and reflected waves of the same frequency"

Explanation:

Standing wave: Standing wave will form when two waves of equal frequency travelling in an opposite direction in the same medium.  There is interference between the incoming and reflected waves of the same frequency.

These waves do not appear to move. There is an oscillation up and down in same phase. Standing wave consists of node and antinode.

Anti node: It is the location in the wave where the amplitude is minimum.

Node: It is the location in the wave where the amplitude is maximum.

Therefore, the correct option is "interference between the incoming and reflected waves of the same frequency ".

Answer:

1522 m

Explanation:

The ultrasound wave takes t=2.0 s to travel from the vessel to the ocean bottom, and then back to the vessel.

This means that the time the wave takes to travel from the vessel to the ocean bottom is just half of this:

[tex]t=\frac{2.0 s}{2}=1.0 s[/tex]

The wave travels at a speed of

v = 1522 m/s

So, we can find the distance between the vessel and the ocean bottom by using the equation of the uniform motion, and we find:

[tex]d=vt=(1522 m/s)(1.0 s)=1522 m[/tex]

Answer:

6.25 g

Explanation:

The half-life of a radioactive isotope is the time needed for the mass of the sample to halve.

Here, we a radioactive polonium sample, whose half-life is

[tex]\tau_{1/2} = 103 y[/tex]

The mass of sample left after a time t is given by the equation

[tex]m(t) = m_0 (\frac{1}{2})^{t/t_{1/2})[/tex]

where

[tex]m_0 = 100 g[/tex] is the initial mass

[tex]\tau_{1/2} = 103 y[/tex] is the half-life

If we substitute t = 412 y , we find the mass of sample left:

[tex]m(t) = (100 g) (\frac{1}{2})^{412 y/103 y}=(100 g)(\frac{1}{2})^{1/4}=6.25 g[/tex]

After 412 years, approximately 6.25 grams of a 100 gram polonium sample would remain, given a half-life of 103 years.

The subject matter in this question concerns the half-life of radioactive polonium. A half-life is the time it takes for half of a sample of a radioactive substance to decay. For polonium, this is stated to be 103 years.

Given that the half-life of polonium is 103 years, a 100 g sample would reduce to half its size (50 g) after 103 years. After another 103 years (206 years total), this 50 g would reduce by half again to 25 g. After 309 years, the sample would half again, leaving 12.5 g. Finally, after 412 years (or roughly 4 half-lives), the remaining amount of the initial sample would be half of 12.5 g, which is 6.25 g.

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Answer:

Explanation:

Answer:

Explanation:

The half life is the time taken for half of a radioactive substance to disintegrate.

The shorter the half life, the larger the decay constant and the faster the decay process.

For a very large half life, it would take a very long time for the radioactive nuclide to decay to half.

With each half life reached, a new set of daughter cell is formed. Atoms that have short half life would decay rapidly. Every radionuclide has its own characteristic half-life.

If the number of half-lives increases, then the number of radioactive atoms decreases, because approximately half of the atoms' nuclei decay with each half-life. With this observation, we can hypothesise and conduct experiment to support the assertion that as the number of half-lives increases then the number of radioactive atoms decreases.

If the number of half-lives increases, then the number of radioactive atoms decreases, because each half-life reduces the quantity of radioactive atoms by about half. This is due to the nature of radioactive decay, causing a consistent, exponential decrease over time.

A hypothesis about how the number of half-lives impacts the number of radioactive atoms might be: If the number of half-lives increases, then the number of radioactive atoms decreases because approximately half of the atoms' nuclei decay with each half-life.

In the concept of radioactive decay, a half-life denotes the period of time it takes for half of the atoms in a radioactive sample to decay. When there are more half-lives that pass, this indicates more time has passed, and therefore more of the radioactive atoms would have decayed. Consequently, the number of radioactive atoms lessens over time due to this continuous decay.

For example, if you started with 1000 radioactive atoms and the half-life of this particular substance is 1 year, after one year (one half-life), there would be approximately 500 radioactive atoms remaining. After two years (two half-lives), around 250 atoms would remain, and so on. Hence, it's crucial to realize that the decrease in the number of radioactive atoms is exponential, not linear.

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D is the answer I’m pretty sure

Answer:

Amplitude and wavelength

Explanation:

- The amplitude of a wave is the maximum displacement of the wave, measured with respect to the equilibrium position (so, for a water wave it is the maximum height of the wave relative to the equilibrium position)

- The wavelength of a wave is the distance between two consecutive crests (or throughs) of a wave. So, for a water wave, it is the distance between two consecutive waves

Therefore, in the example in the problem we have:

- 2 meters corresponds to the amplitude

- 35 meters corresponds to the wavelength

Answer:

let distance be D km  

total time taken, T (hrs) = D/30 + D/50  

Average speed , V = total distance/ total time = 2D/T = 2/(1/30+1/50) = 37.5 km/hr

Explanation:

Average speed = total distance / total time

= (30+45) km / 2hr

= 75 / 2

= 37.5 km/hr is the average speed of the train.

Answer:

#4

Explanation:

In balanced nuclear and chemical equations, the sums of the subscripts on each side of the equation and the sums of the superscripts are the same. The most useful quantity for counting particles is the mole. Steps for balancing a chemical equation involve identifying the most complex substance, balancing the atoms and polyatomic ions, and counting the numbers of atoms to ensure a balanced equation.

In balanced nuclear equations, the sums of the subscripts on each side of the equation are the same, as are the sums of the superscripts.

The most useful quantity for counting particles is the mole. So if each coefficient is multiplied by a mole, the balanced chemical equation tells us that 1 mole of nitrogen reacts with 3 moles of hydrogen to produce 2 moles of ammonia. This is the conventional way to interpret any balanced chemical equation.

Steps in Balancing a Chemical Equation:

Neutrons are also known as subatomic particles. This means that they are smaller than an atom but they can be elementary or composite. Neutrons are located in the nucleus of the atom also called the center.

Answer:

c hydrogen

Explanation:

The answer is Hydrogen

Answer:

1.) Nebular cloud of gas and dust.

2.) Cloud collapses under the force of its own gravitational attraction; usually triggered by a supernova.

3.)Condensed material begins to combine and form a core center, as it warms, a  protostar is formed.

4.)Other gas and matter of the nebular cloud begin to rotate around the protostar, forming a flattened disk.

5.) Stellar core heats as it grows; nuclear fusion begins and a star is born.

6.) Nuclear energy runs out; death: possible supernova.

Hope this helped you out!

Answer:

0.86 m

Explanation:

We can solve the problem by using the law of conservation of energy.

The initial mechanical energy of the flower pot is just gravitational potential energy, given by:

[tex]E_i = U = mgh[/tex]

where

m = 2.50 kg is the mass of the pot

g = 9.8 m/s^2 is the acceleration due to gravity

h = 12.0 m is the height

When the pot hits and compresses the spring coming to a stop, all this energy is converted into elastic potential energy of the spring:

[tex]E_f = U = \frac{1}{2}kx^2[/tex]

where

k = 800 N/m is the spring constant

x is the compression of the spring

Due to the conservation of energy,

[tex]E_i = E_f[/tex]

So we can write

[tex]mgh=\frac{1}{2}kx^2\\x=\sqrt{\frac{2mgh}{k}}=\sqrt{\frac{2(2.50 kg)(9.8 m/s^2)(12.0 m)}{800 N/m}}=0.86 m[/tex]

Answer:

Thermosphere

temperature continue to rise up to 1500*C

Ionosphere

Mesosphere

temperature falls to -93*C

Stratosphere

protective ozone layer

UV radiation causes temperature to rise

Troposphere

78% nitrogen, 21% oxygen

temperature drops from 17 to -52*C

Explanation:

Answer:

When the electrical potential reaches a threshold, an actual potential occurs in the muscle fibers.

Explanation:

A muscle fiber is a special type of a cell which can change its shape due to actin chains sliding across each other. This process then causes changes in the electrical potential of the muscle.

There are few types of muscle fiber that designed for specific type of muscles activity. Some of them involved in endurance exercises whereas others are best for the strength exercises. These muscles fibers are attached to bones allowing them to move.

a) 4.5

The mechanical advantage of a frictionless ramp is given by:

[tex]MA=\frac{L}{h}[/tex]

where

L is the length of the ramp

h is the height of the ramp

In this problem,

L = 18 m

h = 4 m

Substituting these values into the formula, we find

[tex]MA=\frac{18 m}{4 m}=4.5[/tex]

b) 88.9 N

For a frictionless ramp, the input work is equal to the output work:

[tex]W_i = W_o\\F_i L = F_o h[/tex]

where

[tex]F_i[/tex] is the force applied by the person

L = 18 m is the length of the ramp

[tex]F_o = 400 N[/tex] is the output force, which corresponds to the weight of the crate

h = 4 m is the height of the ramp

Solving the equation for [tex]F_i[/tex],

[tex]F_i = \frac{F_o h}{L}=\frac{(400 N)(4 m)}{18 m}=88.9 N[/tex]

If two forces "balance" each other, that means that they add up to zero.

THAT means that they must have exactly equal magnitudes and exactly opposite directions.

If you want to draw a picture of a pair of two balanced force vectors . . . .

1).  Draw two arrows with exactly the same length.

2).  Flip one of them over, so that it points in exactly the opposite direction compared to the first one.

3).  Place them tail-to-tail.

actually the line through the midpoint and perpendicular to the line joining the two charges. that the positive and negative charges are equal in magnitude.

A positive test charge only has potential energy if there's a negative charge out there somewhere, attracting it.

As long as the positive charge is not right up close to the beckoning negative charge, it'll spring in that direction if you let it.

So the positive test charge doesn't run out of potential energy until it reaches the place of its heart's desire ... as far from other positive charges as it can get, AND up against or on top of the nearest negative charge.

I believe the correct answer is A

The momentum of the object is 3600 kg m/s.

Answer: Option C

Explanation:

Momentum is the measure of motion done by an object. It is a vector quantity. It is defined as measure of velocity at which object is moving. So the momentum is found to be directly proportional to product of mass (m) of the object and velocity attained by the object. Thus,

                      [tex]\text {Momentum of the object} = m \times \text { Acceleration }[/tex]

As the mass of the object is given as 120 kg and the velocity attained by the object is 30 m/s, then the momentum of the object will be

                     [tex]\text {Momentum of the object} = 120 \times 30 = 3600 \mathrm{kgm} / \mathrm{s}[/tex]

So, the momentum of the object is 3600 kg m/s.