Help me please, it's for physics and I really need help.

I believe friction is what it's called?

Answer:

(a) h = 16.53 m (b) t = 1.83 s

Explanation:

Given that,

The initial velocity of a ball, u = 18 m/s

When it reaches to the maximum height, its final velocity v will be 0. Let it goes to a maximum height of h meters.

Finding t using first equation of motion as follows :

v = u +at

Here, a = -g and v = 0

\(t=\dfrac{u}{g}\\\\t=\dfrac{18}{9.8}\\\\t=1.83\ s\)

The time needed for the ball to reach its max height is 1.83 s.

Let h is the maximum height. Using second equation of motion to find it :

\(h=ut-\dfrac{1}{2}gt^2\\\\h=18(1.83)-\dfrac{1}{2}\times 9.8\times (1.83)^2\\\\h=16.53\ m\)

So, it will go to a maximum height of 16.53 m.

The atomic packing factor (APF) and coordination number are related to the strength of a material that they determine the arrangement of atoms in a crystal structure, which in turn affects its mechanical properties.

The APF is the ratio of the total volume occupied by atoms in a crystal to the total volume of the crystal and represents how densely the atoms are packed together. A higher APF indicates a more densely packed crystal structure and is often associated with higher mechanical strength. The coordination number is the number of atoms directly surrounding an atom in a crystal structure and is related to the way atoms bond with one another. A higher coordination number means that atoms are bonded more strongly to their neighbors, which can contribute to increased mechanical strength. However, it is important to note that the strength of a material is determined by many factors and cannot be solely attributed to the APF and coordination number. Other factors such as defects, crystal orientation, and temperature also play a role in determining the strength of a material.

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The maximum height the rocket will reach is 298.584m if its initial velocity is 76.5m/sec and it flies upwards.

We know that at highest point final velocity of the rocket will be 0m/sec.Now,we have initial velocity of rocket,final velocity of rocket,acceleration due to gravity.

We are taking upward direction as positive and downward direction as negative, due to that value of acceleration due to gravity is -9.8m/sec²

So,we can use third equation of motion which is given by

v² - u² =2aS

where v is the final velocity of rocket,

u is initial velocity of rocket

a is acceleration of the rocket

and S is the distance travelled by the rocket

We have v=0m/sec,u=76.6m/sec,a=9.8m/sec²,S=?

So,on putting the values,we get

=>(0)² - (76.5)² = 2 × (-9.8) × S

=>S=(76.5)² / 19.6

=>S=5852.25/19.6

=>S=298.584m

Hence, maximum height attained by rocket  is 298.584m.

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Answer:

d. wavelength/2.

Explanation:

The circular motion of water molecules extends from regions of shallow water to deep water. It ranges from a depth, H < L/20 for shallow water to a depth of H > L/2 for deep water where L is the wavelength of the wave.

For depths greater than L/2,the circular motion is not affected by the wave energy. So, the maximum depth for the circular motion is L/2 = wavelength/2.

Copernicus's model of the universe differs from Ptolemy's because Copernicus believed the Sun is at the center of the universe and majority of the bodies in the universe revolves around the Sun.

The universe is defined as the open place that contains the planets, stars, galaxies, and all other forms of matter and energy.

There are different models of the universe including which contains the Copernicus's model and Ptolemy's model.

The Copernicus's model of the universe differs from Ptolemy's because Copernicus believed the Sun is at the center of the universe and majority of the bodies in the universe revolves around the Sun.

While the Ptolemy's model of the universe differs from the Copernicus's model because Ptolemy believed that the Earth is at the center of the universe and everything in the universe revolves around the Earth.

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When you increase the voltage of an electron beam, the radius of the beam will decrease. This is because the increased voltage causes the electrons in the beam to gain more energy, which increases their speed and therefore their momentum. As a result, the beam becomes more focused and the radius decreases.

On the other hand, when you increase the current of an electron beam, the radius of the beam will generally increase. This is because an increase in current means there are more electrons in the beam, which can lead to a more diffuse and spread-out beam. However, this effect can be mitigated by using magnetic fields to focus and shape the beam.

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Answer:

eye ,mouth,and,ears face

Answer:

knee, elbow, and wrist

Explanation:

Answer:

x=2.4t+4.9t^2

Explanation:

This equation is one of the kinematic equations to solve for distance. The original equation is as follows:

X=Xo+Vt+1/2at^2

We know that the ball starts at rest meaning that its initial velocity and position is zero.

X=0+Vt+1/2at^2

Since it is going down the ramp, you can use the acceleration of gravity constant. (9.81 m/s^2) and simplify that with the 1/2.

X=Vt+4.9t^2

Note: Since the positive direction in this problem is down, you are adding the 4.9t^2, but if a question says that the downward direction is negative, you would subtract those values.

Now, substitute in your velocity value.

X=2.4t+4.9t^2

A 5 kg object moving with a speed of 10 m/s collides with a 4 kg objective moving with a velocity of 15 m/s in a direction 37 degrees from the initial direction of motion of the 5 kg object. What is the speed of the two objects after the collision if they remain stuck together? The answer is V = 10.575 m/s (approx)

According to the law of conservation of momentum, in an isolated system, the total momentum before and after a collision is always conserved. This concept can be used to solve problems related to collisions.In the given scenario, the collision is between two objects of 5 kg and 4 kg, respectively. Their initial speeds and directions are also given. Let us assume that the final velocity of the two objects (after collision) is V.

The speed of the two objects can be calculated using the law of conservation of momentum.

Hence, the total momentum before and after collision is given by,

m1v1 + m2v2 = (m1 + m2)V

where m1, v1, and m2, v2 are the mass and initial speed of the two objects, respectively.

Substituting the given values, we get, 5(10)cos0° + 4(15)cos(37°) = (5 + 4)V

where cos0° = 1 and cos37° = 0.798

Since the two objects are stuck together after collision, the mass of the two objects becomes 5+4 = 9 kg. Hence, the equation can be simplified as, 50 + 45.18 = 9V95.18 = 9V. Therefore, the speed of the two objects after collision if they remain stuck together is V = 10.575 m/s (approx).

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Answer:

The impression of the image on the retina lasts for about 1/16th of a second after the removal of the object. If a burning stick of incense is revolved at a rate of more than sixteen revolutions per second, we see a circle of red light due to persistence of vision.

Explanation:

Answer:

Radiator

Explanation:

Black bodies are good absorbers of heat, because heat is absorbed by the color black. But they are bad radiators of heat because white radiates heat.

This activity we see the scattering of light in all its colors, following the refraction law, in the order of the rainbow.

The greatest difficulties is adjusting the angle of the water jet to have the correct incident angle.

1) Refraction is the phenomenon of refracting light when it enters a material by the dependence of the refractive index with the wavelength, the refraction is

                 \(n_i \ sin \ \theta_i = n_r \ sin \ \theta_r\)

Where \(n_i\) and \(n_r\) are the refractive indices of the two media, incident and refracted, respectively, tai are the angles with respect to the normal to the surface.

When we launch a water jet, for example from a hose in the shape of a fan, the sunlight that enters the jet according to this relationship is refracted at various angles, this phenomenon is called rainbows.

The light with more energy (shorter wavelength) refracts less, that is, violet light and light with lower energy (longer wavelength) refracts more, that is, red, for which we observe a spectra with the colors of the rainbow, violet, blue green yellow orange and red.

2) in this activity the law of refraction and the dependence of the refractive index with the wavelength of the incident radiation are observed.

3) There are some problems when doing this activity

In summary, in this activity we see the scattering of light in all its colors, following the  refraction law.

The greatest difficulties is adjusting the angle of the water jet to have the correct incident angle.

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Answer:

0.531m

Explanation:

Soln

Mass = 3.2kg

Kinetic energy = 8 J

Mechanical energy = 25 J

Recall,

Mechanical energy = K.E + P.E

But P.E = mass × g × h

where g = acceleration due to gravity = 10ms² and h = height.

Mechanical energy = K.E + mass × g × h

25 = 8 + 3.2×10×h

25 - 8 = 32×h

17 = 32×h

divide both sides by 32

17/32 = h

h = 0.531 metres.

When Marta flies past at 0.65c, her spaceship will be measured to be approximately 38.045 meters long.

The length of Marta's spaceship as measured by an observer when she flies past at a relativistic speed, we can use the length contraction formula for calculating this:

L' = L √(1 - v²/c²)

where L is the rest length of the spaceship, v is the relative velocity, and c is the speed of light.

Given:

Rest length of the spaceship, L = 50 meters

Relative velocity, v = 0.65c (where c is the speed of light)

Substituting these values into the formula:

L' = L √(1 - v²/c²)

  = 50 √(1 - (0.65c)²/c²)

  = 50 √(1 - 0.65²)

  = 50 √(1 - 0.4225)

  = 50 √(0.5775)

  ≈ 50 × 0.7609

  ≈ 38.045 meters

Therefore, when Marta flies past you at a speed of 0.65c, you will measure her spaceship to be approximately 38.045 meters long.

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Answer:

Constant and positive constant

Explanation:

The object move with the same velocity at the same interval

Answer:

1.3875 Joules. 2. 0.17A 3. 35.47volts

Explanation:

1. Energy = Q × V = 5 × 775 = 3875 Joules.

Q is quantity of electricity in Columbs

V is Voltage in volts

2. From Q = I × t

Q is quantity of electricity in Columbs

T is time taken

I is current

Now we define I as the quantity of electricity in 1 sec; hence;

200= I × 20× 60 [ 20minutes converted to seconds ]

I = 200/ 20× 60.= 200/1200=0.1667

= 0.17A( to the nearest hundredth)

3.v = E/ Q ( from equation in question 1)

V = 337/9.5 = 35.47volts

Answer:

Derived quantities are quantities that are calculated from two or more measurements. Derived quantities cannot be measured directly. They can only be computed. Many derived quantities are calculated in physical science. Three examples are area, volume, and density.

Answer:

What is derive quantities​?

Derived quantities are those that may be expressed in terms of base or derived quantities by means of the mathematical symbols of multiplication and division only (no addition or subtraction or any other sign). ... The first group consists of derived quantities, which have proper units. Derived quantities are expressed as algebraic combinations of base quantities.

Examples of the Derive quantities

Derive Quantity and their units

Only the wavelength distinguishes the many colors of visible light. The distance between two consecutive wave crests or troughs is known as the wavelength.

The length of a waveform signal that is propagating in space or over a wire is measured by the separation between identical points (adjacent crests) in the adjacent cycles. This length is typically specified in meters (m), centimeters (cm), or millimeters (mm) in wireless systems (mm).

The wavelength, which is also the distance between two wave crests and troughs, is the measurement of wave length. In cycles per second (Hz), the term "frequency" refers to the number of vibrations that cross a specific area in a second (Hertz).

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Answer:

b

Explanation:

a,f,,and g is correct because it is indicated that object moving forward

Answer:

The golf ball has a constant velocity

Explanation:

Answer:

The 5 Forces

Explanation:

The five forces that influence wind speed and direction are: Pressure gradient force (flow from high to low pressure) Coriolis force (apparent deflecting force due to the rotation of the Earth) Turbulent drag (Earth's surface or objects like trees or grass resist air flow and decrease wind speed near the ground)

Answer:

C. oversaturated

Explanation:

Sana nakatulong

Answer:

this is the velocity

Explanation:

Uniform Velocity-A body is said to have uniform velocity if it covers equal distance in equal intervals of time in a particular direction, however, the time intervals may be small.

The thing that happens when you push or pull a water tube is that the force makes the tube to speed up, slow down, or be in one place.

It is very hard when pulling  water and if a person need to consistently pull air out of the tube before water makes it to the pump, it is very  difficult and some pumps may or cannot do it.

In regards to pushing, when a person is pushing above the Center of Gravity, one is pushing the said object into the ground and thus is increasing the rate of friction.

If a person is pulling you are said to be pulling above the Center of Gravity and lowering friction.

So, The thing that happens when you push or pull a water tube is that the force makes the tube to speed up, slow down, or be in one place.

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When an electron in a hydrogen atom jumps from n = 3 to n = 2, the frequency of the emitted electromagnetic radiation is approximately 19.65 x 10^7 H

To calculate the frequency of electromagnetic radiation emitted when an electron in a hydrogen atom jumps from energy level n = 3 to n = 2, you can use the Rydberg formula:

1/λ = R_H × (1/n_final^2 - 1/n_initial^2)

where λ is the wavelength of the radiation, R_H is the Rydberg constant for hydrogen (approximately 1.097 x 10^7 m^-1), and n_final and n_initial are the final and initial energy levels, respectively.

To find the frequency (f) of the radiation, you can use the equation:

f = c / λ

where c is the speed of light in a vacuum (approximately 3.00 x 10^8 m/s).

Given:

n_final = 2

n_initial = 3

Let's calculate the frequency:

Using the Rydberg formula:

1/λ = R_H × (1/n_final^2 - 1/n_initial^2)

1/λ = 1.097 x 10^7 m^-1 × (1/2^2 - 1/3^2)

1/λ = 1.097 x 10^7 m^-1 ×(1/4 - 1/9)

Calculating the result:

1/λ = 1.097 x 10^7 m^-1 × (9/36 - 4/36)

1/λ = 1.097 x 10^7 m^-1 × (5/36)

1/λ = 0.1526 x 10^7 m^-1

Now, let's calculate the frequency using the equation f = c / λ:

f = c / λ

f = (3.00 x 10^8 m/s) / (0.1526 x 10^7 m^-1)

f = 19.65 x 10^7 Hz

Therefore, when an electron in a hydrogen atom jumps from n = 3 to n = 2, the frequency of the emitted electromagnetic radiation is approximately 19.65 x 10^7 Hz.

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Given,

The volucme of Kayak, V₁=0.285 m³

The mass of the Kayak when the man is sitting in it, m₁=75 kg

The volume of the man, V₂=0.066 m³

The density of the man, d=1000 kg/m³

The mass of the man inside the Kayak is given by,

On substituting the known values,

The mass of the empty Kayak is,

Given that only half of the volume of the man is inside the Kayak when he is sitting in it. Half of the man's volume which is outside the Kayak will be considered in the total volume of the Kayak when he is sitting in it. Thus we have to subtract half of his volume, which is outside the Kayak, while we calculate the density of the Kayak.

Thus the density of the empty Kayak is

On substituting the known values,

Thus the density of the Kayak is 35.71 kg/m³