Which of the following correctly describes the horizontal and vertical
motion of an object projected horizontally with a speed, v, from a
height, h?
constant speed for both horizontal and vertical
acceleration for both horizontal and vertical is increasing
constant acceleration for horizontal: constant speed for vertical
constant speed for horizontal; constant acceleration for vertical

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:

(A) The acceleration of Melissa is 0.211 m/s²

(B) The net force on Melissa is 9.5 N

Explanation:

Given;

radius of the carousel, r = 8.0 m

speed of Melissa, v = 1.3 m/s

mass of Melissa, m = 45 kg

(A) The acceleration of Melissa is given by centripetal acceleration;

[tex]a_c = \frac{v^2}{r} \\\\a_c = \frac{1.3^2}{8}\\\\a_c = 0.211 \ m/s^2[/tex]

(B) The net Force on Melissa is given by centripetal force;

[tex]F_c = ma_c\\\\F_c = 45 *0.211\\\\F_c = 9.5 \ N[/tex]

Answer:

B. The field is moving

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

​

Answer:

you change the direction of the magnetic field.

Explanation:

Because the magnetic field created by the electric current in the wire is changing directions around the wire, it will repel both poles of the magnet by bending away from the wire.

Answer:

Particle spacing increases and it's called evaporating

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:

due to the heating of particles

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:

2.89 m/s²

Explanation:

From the question given above, the following data were obtained:

Radius (r) = 100 m

Velocity (v) = 17 m/s

Acceleration (a) =.?

The acceleration of a circular motion is defined by:

a = v²/r

Where:

a is the acceleration.

v is the velocity.

r is the radius.

With the above formula, we can obtain the acceleration of the car as follow:

Radius (r) = 100 m

Velocity (v) = 17 m/s

Acceleration (a) =.?

a = v²/r

a = 17²/ 100

a = 289/100

a = 2.89 m/s²

Therefore, the acceleration of the car is 2.89 m/s²

Answer:

A: It allows scientists to challenge inaccurate information.

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:

Scientists are developing techniques to detect signatures from space in their search for alien life.

The Very Large Array (VLA) telescope, at the National Radio Astronomy Observatory (NARO) site in Socorro, New Mexico, will be used to constantly seek evidence of technosignatures.

Hope this helps

Answer:

0.161

Explanation:

N = mg

= 8.2(9.81)

= 80.442 N

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:

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:

activity level

Explanation:

Answer:

B can take 0.64 sec for the longest nap .

Explanation:

Given that,

Total distance = 350 m

Acceleration of A = 1.6 m/s²

Distance = 30 m

Acceleration of B = 2.0 m/s²

We need to calculate the time for A

Using equation of motion

[tex]s=ut+\dfrac{1}{2}at_{A}^2[/tex]

Put the value in the equation

[tex]30=0+\dfrac{1}{2}\times1.6\times t_{A}^2[/tex]

[tex]t_{A}=\sqrt{\dfrac{30\times2}{1.6}}[/tex]

[tex]t_{A}=6.12\ sec[/tex]

We need to calculate the time for B

Using equation of motion

[tex]s=ut+\dfrac{1}{2}at_{B}^2[/tex]

Put the value in the equation

[tex]30=0+\dfrac{1}{2}\times2.0\times t_{B}^2[/tex]

[tex]t_{B}=\sqrt{\dfrac{30\times2}{2.0}}[/tex]

[tex]t_{B}=5.48\ sec[/tex]

We need to calculate the time for longest nap

Using formula for difference of time

[tex]t'=t_{A}-t_{B}[/tex]

[tex]t'=6.12-5.48[/tex]

[tex]t'=0.64\ s[/tex]

Hence, B can take 0.64 sec for the longest nap .

Answer:

Acceleration = 6 m/s²

Explanation:

Given:

Initial velocity u = 0 m/s

Final velocity v = 30 m/s

Time taken t = 5 second

Find:

Acceleration

Computation:

v = u + at

30 = 0 + (a)(5)

30 = 5a

Acceleration = 30 / 5

Acceleration = 6 m/s²

Answer:

2.5m/s^2

Explanation:

a=velocity/time

a=25m/s/10s

a=2.5m/s^2

Answer:

decomposers break down waste to yield ammonia.

Explanation:

The nitrogen cycle is the process by which nitrogen circulates among the atmosphere, terrestrial, and marine ecosystems and is converted into multiple chemical forms through both biological and physical processes.

In the nitrogen cycle, decomposers do not break down waste to yield ammonia.

So, the option ''decomposers break down waste to yield ammonia'' is correct.

Answer:The object will begin to move

Explanation:

Explanation:

The emf is equal to the work done on the charge per unit charge (ϵ=dWdq) when there is no current flowing. Since the unit for work is the joule and the unit for charge is the coulomb, the unit for emf is the volt (1V=1J/C).

Answer:

The EMF or electromotive force is the energy supplied by a battery or a cell per coulomb (Q) of charge passing through it. The magnitude of emf is equal to V (potential difference) across the cell terminals when there is no current flowing through the circuit. (byjus)

Explanation:

The distance traveled by car with a constant speed of 20m/s is equal to 240m.

The speed of an object can be defined as the distance traveled by the object in a definite time interval. The speed is a scalar quantity as it carries only the magnitude and does not have any direction.

The speed can be calculated from the ratio of the distance traveled by the object to the time taken to cover that distance.

The speed equation for an object can be written as follows:

Speed = distance /time taken

Distance = Speed × time

Given, the speed of the car = 20 m/s

The total time taken by car to travel the distance = 12 sec

The distance traveled by car = 20 × 12 = 240 m.

Therefore, the car will travel a distance of 240 meters in a given time.

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