Which one is the answer please

Answer:

free free free free free free free free free free free free free free free free free points

Answer:

A) 1.53s

B) 19.8m

C) 2.869m

Explanation:

A) The time of flight for a projectile can be calculated using the formula:

t = 2μsinθ/g

Where; u = velocity

θ = angle

g = acceleration due to gravity (9.8m/s^2)

t = 2 × 15 × sin 30°/9.8

t = 30sin30°/9.8

t = 30 × 0.5/9.8

t = 15/9.8

t = 1.53s

B) The horizontal range (distance) for a projectile can be calculated using the formula:

Range = u²sin2θ/ g

Range = 15² sin 2 × 30 / 9.8

Range = 225 sin 60/9.8

Range = 225 × 0.8660/9.8

Range = 194.855/9.8

Range = 19.8m

C) The maximum height for a projectile can be calculated using the formula:

h = u²sin²θ/2g

h = 15² (sin 30)² / 2 × 9.8

h = 225 × 0.25 / 19.6

h = 56.25/19.6

h = 2.869m

​

Lungs do not help in the perception and production of sound in humans.

Gaseous exchange occurs during inhalation and exhale during breathing. Main components of the human respiratory system include the nose, mouth, throat, larynx, trachea, bronchi, and lungs.

In humans and other vertebrates, the primary organs for respiration are the lungs. They are situated in the thoracic cavity of the chest, on either side of the heart. The lungs are spongy, anatomically speaking, with a total surface area that ranges from 50 to 75 square meters.

The lungs' main job is to make it easier for gases to move from the blood into the air. It's interesting to note that the right lung is significantly larger and heavier than the left.

Hence, lungs do not help in the perception and production of sound in humans.

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Answer:

D

Explanation:

it's the only negative one

Answer:

letter C.

Explanation:

Answer:

Im not smart

Explanation:

but im your bff

Answer:

it explain how everythings work you should work with the speed of light multiply with the distance of the equator

Answer:

119.88 km/h

Explanation:

1500/45=33.3

use a m/s to km/h calculator

put in 33.3 for m/s and you will get 119.88 km/h.

119.88 km/h.

Answer:

33.3 s

162 km/h

Explanation:

Given:

Δx = 1500.0 m

v₀ = 45.0 m/s

a = 0 m/s²

Find: t

Δx = v₀ t + ½ at²

1500.0 m = (45.0 m/s) t + ½ (0 m/s²) t²

t = 33.3 s

Convert m/s to km/h:

45.0 m/s × (1 km / 1000 m) × (3600 s / 1 hr) = 162 km/h

Answer:

Speed = 20 m/s

Explanation:

The speed of a bus is 72 km/h

The SI unit of speed is m/s

We need to convert it into m/s

We know that,

1 km = 1000 m

1 h = 3600 s

It means,

[tex]s=72\ \dfrac{km}{h}\\\\=\dfrac{72\times 1000\ m}{3600\ s}\\\\=20\ m/s[/tex]

So, the speed of the bus is 20 m/s.

Answer: D

Explanation:

Answer:

The Answer is C. The force of gravity

Explanation:

This is because it is the force of gravity exerted or inflicted upon the object or organism. With more gravity inflicting upon an object the heavier it feels. In fact, weight and gravity have such a close relationship that the equation for weight is F = M x A where F represents the objects weight in Newtons, M equals it's mass, and A represents the downward acceleration due to the gravity.

Answer:

The answer is c

Explanation:

Answer:

object 1 had faster-moving particles.

Before the two objects came into contact with each other, object 1 had faster-moving particles.

The thermal energy of an object is the energy possessed by the object due to temperature difference.

The thermal energy of an object increases with increase in kinetic energy of the object. The kinetic energy of the object increases with increase in speed of the object.

Thus, we can conclude that before the two objects came into contact with each other, object 1 had faster-moving particles.

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Answer:

Particle spacing increases and it's called evaporating

Answer:

1,2: When simple molecular substances melt or boil, it is these weak intermolecular forces that are overcome. The covalent bonds are not broken. Relative little energy is needed to overcome the intermolecular forces, so simple molecular substances have a low melting and boiling points.

3: Water, Almost no living thing can survive without water. Water is everywhere on our planet. It is the reason we have an organic life on earth. A water molecule consists of one oxygen atom combined with two hydrogen atoms. We use water throughout day and night; in drinking, cooking, household needs, industries, and agriculture. Apart from these general uses of water, you might be amazed to know that water plays a major role in volcanic eruptions.

Answer:

2.5m/s^2

Explanation:

a=velocity/time

a=25m/s/10s

a=2.5m/s^2

Answer:

[tex]\boxed {\tt 3.6 \ seconds}[/tex]

Explanation:

Time can be found by dividing the distance by the speed.

[tex]t=\frac{d}{s}[/tex]

The distance is 45 meters and the speed is 12.5 meters per second.

[tex]d= 45 \ m \\s= 12.5 \ m/s[/tex]

[tex]t=\frac{45 \ m}{12.5 \ m/s}[/tex]

Divide. Note that the meters, or "m" will cancel each other out.

[tex]t=\frac{45 }{12.5 \ s}[/tex]

[tex]t=3.6 \ s[/tex]

It will take the dolphin 3.6 seconds to swim a distance of 45 meters are 12.5 meters per second.

Answer:3.6 seconds

Explanation: 45/12.5 m/s is 3.6s

Answer:

69

Explanation:

Answer:Newton's second law of motion states that acceleration is directly proportional to net force when mass is constant and that acceleration is inversely proportional to mass.

Explanation: the net force is directly proportional to mass when acceleration is constant.

Answer:

due to the heating of particles

Answer:

I believe it would be B.

Explanation:

When a object is in a gas or liquid form then take whatever the form of the container they are in is. Meaning they can change their volume depending on the container. Also a characteristic of gas and liquid is to take the shape of the container. This may be wrong but this is what I would choose

Answer: A is actually the correct answer. The guy who said B is wrong

Explanation: Gas and plasma both have Changing shape and changing volume

Answer:

left brain the left brain is your rapid more irrisponsibe side while your right cortex thinks about the potential outcomes

Answer:

activity level

Explanation:

Answer:

the carrying capacity will decrease density dependent

Explanation:

The limiting factor of the disease is density dependent and will decrease the carrying capacity of the population because the disease that affect the population operate when the number of organisms in per unit area get to a specific level , it's affected the population when the population per unit are reached a certain level and the disease decrease the carrying capacity of the population. Carrying capacity is the average population size of organisms in an habitat. As the lobsters population is affected by disease, the population sizes reduced because many of the lobsters would of died and inactive, thereby causing a reduction in the size and capacity.

Answer:

When substances made of iron are exposed to oxygen and moisture (water), rusting takes place. Rusting removes a layer of material from the surface and makes the substance weak. Rusting is a chemical change.

Answer:

B) Iron rusts in water

Explanation:

Physical property is defined as the property of a substance which becomes evident during physical changes. Example: Melting point  , electrical conductivity, malleability,

Chemical property is defined as the property of a substance which becomes evident during chemical changes. Example: Reactivity with other substances

Rust is hydrated ferric oxide .

Corrosion of iron is called as rusting. Rust is hydrated ferric oxide .

Thus rusting of iron is a chemical property.

Answer:

C

Explanation:

PLACING BULBS IN SERIES

Increasing the number of bulbs decreases the brightness of the bulbs.

The resistance increases.  In a series circuit, adding bulbs increases the resistance in the circuit. A complete circuit requires the electrons to move from the negative terminal of the battery to the positive terminal.  When one bulb is unscrewed it opens the circuit preventing a complete circuit and the electrons cannot return to the battery.

PLACING BULBS IN PARALLEL

Two bulbs in parallel are brighter than two bulbs in series.   In a parallel circuit each bulb is in its own circuit.  As bulbs are added the resistance in the circuit decreases since each circuit is another pathway for electrons to move from one end of the circuit to the other.

If you unscrew one bulb and all the others stay lit, it is a parallel circuit because each bulb in a parallel circuit has its own path to the battery.

The brightness of the bulbs reduces as the number of bulbs increases in series. Resistance rises in intensity. Adding bulbs to a series circuit raises the circuit resistance. The electrons must pass from the battery's negative to positive terminals in order for the circuit to be complete. When one bulb is removed, the circuit is broken, making it impossible for the electrons to return to the battery.

In comparison to two bulbs in series, two bulbs in parallel are brighter. Each bulb is in its own circuit when the circuits are parallel. As more bulbs are added, the resistance in the circuit reduces because each additional circuit provides an additional route for electrons to travel from one end to the other.

You  can determine the type of circuit used in this model by unscrewing one bulb and all the others stay lit, it is a parallel circuit because each bulb in a parallel circuit has its own path to the battery. Hence, option(C) is correct.

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Answer:

5.45 m/s

Explanation:

Given:

Δx = 2.08 m

v₀ₓ = v₀ cos 44°

aₓ = 0 m/s²

Δx = v₀ₓ t + ½ aₓ t²

2.08 m = (v₀ cos 44°) t + ½ (0 m/s²) t²

2.89 = v₀ t

Given:

Δy = 0.63 m

v₀ᵧ = v₀ sin 44°

aᵧ = -9.81 m/s²

Δy = v₀ᵧ t + ½ aᵧ t²

0.63 m = (v₀ sin 44°) t + ½ (-9.81 m/s²) t²

0.63 = 0.695 v₀ t − 4.905 t²

0.63 = 0.695 (2.89) − 4.905 t²

t = 0.530

v₀ = 5.45 m/s

Answer:

Cutting down trees

Explanation:

The roots of trees often hold settiments in place, thus removing these strong natural barriers makes it easier for erosion to occur.