the gazelle travels 2 km in a half hour.The gazelle's average speed is:
1/2 kmh
1km/h
4km/h​

The heating of a 1 kg parcel at 500 hPa and 250 K with 800 J of radiation heating results in changes in its enthalpy, entropy, and potential temperature.

(a) The change in enthalpy can be calculated using the specific heat capacity at constant pressure (Cp) of dry air. The formula for the change in enthalpy is given as:

Change in enthalpy (ΔH) = Mass of the parcel × Cp × Change in temperature

Assuming the specific heat capacity of dry air (Cp) is approximately constant, we can calculate the change in temperature as:

Change in temperature = Energy input / (Mass of the parcel × Cp)

Change in temperature = 800 J / (1 kg × Cp)

Once we have the change in temperature, we can calculate the change in enthalpy using the specific heat capacity of dry air.

(b) The change in entropy can be determined using the relationship between entropy change and temperature change. However, without additional information, such as the parcel's specific properties or any changes in volume or pressure, it is not possible to calculate the exact change in entropy.

(c) The potential temperature is a measure of the temperature that a parcel of air would have if it were lifted or lowered adiabatically to a reference pressure level. The change in potential temperature can be calculated using the formula:

Change in potential temperature = Change in temperature / (1 + (L / Cp))

Where L is the latent heat of vaporization. However, without information about any phase changes or the presence of water vapor, it is not possible to calculate the exact change in potential temperature.In summary, with the given information and without additional details, we can calculate the change in enthalpy but cannot determine the exact changes in entropy or potential temperature.

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The acoustic quantity that remains the same as a wave travels from one medium to another is the frequency. Option B is the correct answer.

When a wave travels from one medium to another, its speed changes due to the change in the medium's properties. The wavelength of the wave changes in proportion to the change in speed. However, the frequency of the wave remains the same as it is determined by the source of the wave and is independent of the medium through which it travels.

The frequency of the sound wave remains the same, while its speed and wavelength change. This concept is essential in understanding sound propagation and how it behaves in different environments. Therefore, correct choice is B.

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Answer:

One way to distinguish between samples of metal and nonmetal with the help of a hammer is by conducting a simple test called the "ring test." This test involves striking the sample with the hammer and listening for the sound it makes. Metals typically produce a clear, ringing sound when struck, while nonmetals produce a dull, thudding sound. Additionally, you can use a magnet to test if the sample is metal or not. If the sample is attracted to the magnet, it's likely to be a metal, if not it's likely to be a nonmetal.

Answer:

it can kill you cell and win you kill you no cell no life

Explanation:

Answer:

Our bodies are designed to deal with the low levels we're exposed to everyday due to evolution. But, too much radiation can damage tissues by changing cell structure and damaging DNA.  

Explanation:

This can cause serious health problems, including cancer.

Answer:

The name of the highly Electropositive element goes first.

e.g

\(Cl_{2}O \: = > \: dichloride \: oxide\)

Chlorine is more Electropositive than Oxygen.

e.g

\(NO_{2} \: = > \: nitrogen \: dioxide\)

Nitrogen is more Electropositive than Oxygen

The refractive index of the new medium is approximately 1.59.

Snell's law relates the angles of incidence and refraction of light passing through a boundary between two media with different refractive indices (n). The formula is:

n₁ sin θ₁ = n₂ sin θ₂

where n₁ is the refractive index of the first medium, θ₁ is the angle of incidence, n₂ is the refractive index of the second medium, and θ₂ is the angle of refraction.

In this problem, we know that the angle of incidence is 30.0 degrees and the angle of refraction is 18.0 degrees. We also know that the refractive index of air (n₁) is 1.00. Therefore, we can use Snell's law to solve for the refractive index of the new medium (n₂):

n₁ sin θ₁ = n₂ sin θ₂

1.00 sin 30.0° = n₂ sin 18.0°

n₂ = (1.00 sin 30.0°) / sin 18.0°

n₂ ≈ 1.59

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Yes, with the same momentum, it will go to the right.

momentum is the result of a particle's mass and velocity. Being a vector quantity, momentum possesses both direction and magnitude. According to Isaac Newton's second equation of motion, the force applied on a particle is equal to the time rate at which its momentum changes. Check out Newton's motion laws.

A vector quantity, momentum has both a magnitude and a direction. Because momentum has such a direction, it may be used to foretell the direction and rate of motion that will arise from an object colliding with another. The fundamental characteristics of momentum in one dimension are discussed here.

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Answer: answer is in explanation

Explanation:

A doorknob - about 10cm for diameter and the force that causes the torque comes from the person turning the doorknob causing friction. It’s used to open and close doors.

A screwdriver- 2m for diameter and the force that causes the torque comes from the person applying pressure and causing the screwdriver to turn with friction. It’s used to screw a screw into the wall or into an object.

Car wheels- about 12inches in diameter and the force that causes the torque comes from the engine’s chemical force and friction against the road. They’re used to make a car go and stop.

Electric fan- 14 inches in diameter and the force for torque comes from the electricity circulating from the fan making it spin to provide the air coming out of the fan. They’re used to provide people with air as a cooling system.

Pizza cutter- 10cm in diameter and the force for torque comes from the pressure being applied on the handle and the friction between the pizza and the pizza cutter. They’re used to cut pizza.

Winch

Analog clock

Windmill

Water wheel

Skateboard

The different types of wheels that we see very often is doorknob, screwdriver, cartwheels, an electric fan and pizza cutter.

The rotatable counterpart of linear force in mechanics and engineering is torque. Depending on the context of study, it is also known as a moment, point in time of force, rotating force, or turning effect.

A doorknob with a diameter of around 10 cm creates the torque because of friction created by the person twisting the doorknob. Doors are opened and shut with it.

A screwdriver with a diameter of 2 meters produces a torque when someone applies pressure, making the screwdriver turn against resistance. It is employed to fasten a screw to a surface or an item.

Car wheels are roughly 12 inches in diameter, and the torque is produced by the chemical force of the engine and friction with the ground. They are utilized to start and stop vehicles.

Electric fan with a 14-inch diameter; the energy running through the fan causes it to spin, producing the air that flows from the fan. They serve as a conditioning system by providing air to individuals.

Pizza cutter, diameter 10 cm; torque produced by the resistance between the pizza as well as the pizza cutter, as well as pressure applied to the handle. The pizza is cut using these.

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The magnitude of the work done by the student can be calculated using the formula \(W = Fd\), where W represents work, F represents force, and d represents distance. Given that the student exerts a horizontal force of 30.0 N and pushes the box at a distance of 3.0 m, we can determine the magnitude of the work done.

The formula for calculating work is given by W = Fd, where W is the work done, F is the force applied, and d is the distance covered. In this case, the student exerts a horizontal force of 30.0 N and pushes the box at a distance of 3.0 m.

To calculate the magnitude of the work done, we substitute the given values into the formula: W = (30.0 N)(3.0 m) = 90.0 N·m.

The unit of work is the joule (J), which is equivalent to a Newton-meter (N·m). Therefore, the magnitude of the work done by the student is 90 J.

Thus, the correct answer is 90 J.

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Fundamentally, sound waves differ from other waves.

Electromagnetic waves include radio waves, light waves, and X-rays.

Which of the following stands apart from the others fundamentally? Reasoning: Mechanical waves are what make up sound. The remaining responses involve EM waves, which are NOT mechanical waves.

Light and radio waves are both electromagnetic waves; their primary distinction is in their frequency. While the oscillations of the electrons within atoms produce light waves, radio waves are produced by the acceleration of electrons in a radio antenna.

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The kangaroo's horizontal speed will be 9.7 m/s and its departure speed will indeed be 10.65 m/s.

By observing the pace at which this compressed region moves through the medium, we may determine the sound speed. The sound wave travels at a speed of around 343 meters per second in low humidity at 20 degrees Celsius.

The following equation relates the distance to the direction and initial velocity:

d = [v₀²sin2θ]/g, where θ – the angle of the jump.

Thus, v₀² = gd / (sin2θ) = (9.8×8)/0.69 = 113.62

v₀ = 10.65 m/s ( the take off speed).

The horizontal velocity equals:

vₓ = v₀cos 22° = 10.65 m/s × 0.92 = 9.7 m/s

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If  mass and acceleration are given use F =ma.

E*(s) = [1/0.4] / (s+1) - [1/2.4] / (s+3) + [5/2.4] / (s+0.2) - [5s/(s+1)(s+3)]

To find E*(s), we first need to find the Laplace transform of E(s):

E*(s) = L{E(s)} = L{1 - e^(-TS)} * 5s/(s+1)(s+3)

Using the formula for the Laplace transform of an exponential function, we have:

L{e^(-TS)} = 1/(s+T)

So:

E*(s) = (1/(s+T) - 1) * 5s/(s+1)(s+3)

Simplifying this expression, we have:

E*(s) = [5s/(s+1)(s+3)(s+T)] - [5s/(s+1)(s+3)]

Now we need to use partial fraction decomposition to split the first term into two fractions. We can write:

5s/(s+1)(s+3)(s+T) = A/(s+1) + B/(s+3) + C/(s+T)

Multiplying both sides by (s+1)(s+3)(s+T) and simplifying, we get:

5s = A(s+3)(s+T) + B(s+1)(s+T) + C(s+1)(s+3)

Plugging in s=-1, s=-3, and s=-T, we get a system of equations:

-15A = -4B - 2C
5A = -2B - 2C
5A = -4B - 3C

Solving this system, we get:

A = 1/(2T-4)
B = -1/(2T+2)
C = 5/(2T+2)

Substituting these values back into E*(s), we get:

E*(s) = [1/(2T-4)] / (s+1) - [1/(2T+2)] / (s+3) + [5/(2T+2)] / (s+T) - [5s/(s+1)(s+3)]

Finally, plugging in T=0.2s, we get:

E*(s) = [1/0.4] / (s+1) - [1/2.4] / (s+3) + [5/2.4] / (s+0.2) - [5s/(s+1)(s+3)]

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Answer:

40 kW

Explanation:

A railcar has a continuous 1000 N decelerating force any time it is in motion. If no braking occurs, how much power would be required to keep the railcar moving at 40 m/s

Solution:

Power in Physics is the rate of doing work and the work can be mechanical, electrical, etc. The S.I unit of power is the watts (W).

The power required to keep the car moving must match the work done by the friction force (decelerating force) that tends to slow down the railcar.

Work done = Force * displacement

Power = Work done / time = (Force * displacement) / time

Power = Force * (displacement / time)

Power = force * velocity = 1000 N * 40 m/s = 40000 W

Power = 40 kW

The impedance of the circuit expressed in rectangular form is 1600Ω +j 1200Ω.

So, the correct answer is C

A circuit with a power factor of 0.8 lagging dissipates 100W of power with an input voltage of 500V.

To find the impedance of the circuit in rectangular form, first calculate the apparent power (S) using P = S * power factor. In this case, S = 100W / 0.8 = 125VA.

Next, calculate the reactive power (Q) using Q = √(S² - P²), which is Q = √(125² - 100²) = 75VAr.

The current (I) can be found by dividing the apparent power by the input voltage, I = 125VA / 500V = 0.25A.

Now, using Ohm's Law (V = IZ), we can calculate the impedance (Z) as Z = 500V / 0.25A = 2000Ω.

Finally, we can express the impedance in rectangular form by splitting it into real and imaginary components: Z = 1600Ω + j1200Ω, which corresponds to option (c).

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Thus Kinetic energy of the object is 200J when mass is 25 kg and velocity is 4 m/s.

Answer:

a) 50 rad/s

b) 39.8 rev

Explanation:

Given:

r = 0.36 m

v₀ = 0 m/s

a = 1.8 m/s

t = 10 s

a) Find: ω

v = at + v₀

v = (1.8 m/s) (10 s) + (0 m/s)

v = 18 m/s

ω = (18 m/s) / (0.36 m)

ω = 50 rad/s

b) Find: Δθ

Δx = v₀ t + ½ at²

Δx = (0 m/s) (10 s) + ½ (1.8 m/s) (10 s)²

Δx = 90 m

Δθ = (90 m) / (2π × 0.36 m)

Δθ = 39.8 rev

Answer:

yurrrrr 221n54

Explanation:

yurrrrrrrrrrrrrrrrrrrrrr

Answer:

b

Explanation:

EDGE 2021

To determine the minimum thickness required for constructive interference of light reflected from both sides of the film, we can use the equation for the phase change:

2nh = mλ,

where:

- n is the refractive index of the film,

- h is the thickness of the film,

- m is an integer representing the order of the interference (m = 0, 1, 2, ...),

- λ is the wavelength of light in vacuum.

Given:

- The refractive index of the film (n) is 1.70.

- The refractive index of the window glass is 1.52.

- The wavelength of light (λ) is 550 nm (or 550 x \(10^-9\)\(10^-^9\)m).

First, we need to calculate the effective refractive index of the film with respect to the air, which can be obtained using the equation:

n_eff = n_air / n_film,

where n_air is the refractive index of air (approximately 1) and n_film is the refractive index of the film.

n_eff = 1 / 1.70

Next, we substitute the values into the phase change equation:

2nh = mλ,

2(n_eff - 1)h = mλ.

We are looking for the minimum thickness (h) that satisfies constructive interference, which corresponds to the first-order interference (m = 1).

Therefore, we can write the equation as:

2(n_eff - 1)h = λ,

2(1.70 - 1)h = 550 x \(10^-9\) m,

0.70h = 550 x \(10^-9\) m.

Now, we can solve for h:

h = (550 x \(10^-9 m\)) / 0.70,

h ≈ 785.7 x \(10^-9\)m.

Converting to millimeters:

h ≈ 0.7857 mm.

So, the minimum thickness required for constructive interference is approximately 0.7857 mm.

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The maximum value of the magnetic field in the electromagnetic wave is approximately 1.86 x 10⁻⁶ T.

Given information,

The energy flow per unit time per unit area = 601 mW/m²

The energy flow per unit time per unit area is given: S = (1/2) x  ε₀ x  c x  E₀²

Where ε₀ is the vacuum permittivity, c is the speed of light in a vacuum, and E₀ is the maximum electric field strength.

The magnetic field strength (B) and electric field strength (E) in an electromagnetic wave are related by the equation: B = E / c

S = (1/2) x  ε₀ x  c x  (B x c)²

S = (1/2) x  ε₀ x  c³ x  B²

B² = (2 x  S) / (ε₀ x  c³)

Taking the square root of both sides:

B = sqrt((2 x  S) / (ε₀ x  c³))

ε₀ = 8.854 x 10⁻¹² F/m (vacuum permittivity)

c = 3 x 10⁸ m/s (speed of light in a vacuum)

B = sqrt((2 x  0.601) / (8.854 x 10⁻¹² x  (3 x 10⁸)³))

B ≈ 1.86 x 10⁻⁶ T (Tesla)

Therefore, the maximum value of the magnetic field in the electromagnetic wave is approximately 1.86 x 10⁻⁶ T.

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Hi!Schrodinger equation is written as HΨ = EΨ, where h is said to be a Hamiltonian operator.

The tension in the rope is 150 N.

The tension in the rope would be 150 N.

What are the given values?

Given,Mass of the engine = 135 kg

Mass of the pulley system = 6.65 kg

Acceleration due to gravity = 9.8 m/s²

Formula to calculate tension,T = m(g + a)

Where,T is the tension in the rope,m is the mass of the engine, and

a is the acceleration of the system.Here, the pulley system is at rest.

So, acceleration of the system is zero. Hence,a = 0

Substituting the given values in the above formula,T = 135 kg × (9.8 m/s² + 0)T = 1323 N

Now, the pulley system multiplies the tension by a factor of two.

Tension in the rope,T = 1323/2 N = 661.5 N= 662 N

Therefore, the tension in the rope is 150 N.

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The mass of an object that experiences a gravitational force of 685 N near earth's surface where g = 9.80 m/s² is 98.89 kg.

Any two mass-containing objects are attracted to one another by the gravitational force. Because it consistently attempts to pull masses together rather than pushing them apart, the gravitational force is known as attractive.

In reality, everything in the cosmos is tugging on everything else, including you!

According to the question,

The gravitational force of 685 N near earth's surface.

The acceleration due to gravity is  g = 9.80 m/s².

The formula for force acting of the body under the influence of gravitation is ;

Force = mass×acceleration

Substitute the given values;

685 = m×9.8

m = 685/9.8

m = 69.89 kg.

Therefore, mass of an object is 69.89 kg.

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Answer:

Maybe you're hanging out around the wrong crowd. The people you are probably choosing to be around are more quiet then you.

Explanation:

Rocks with a silica content of around 70% and composed primarily of quartz and feldspars are at the light-colored extreme. Granitic rock refers to these rocks.

Amorphous silicon dioxide, or SiO2, is employed in microsystems as a structural or sacrificial layer in many micro - milling techniques, as a dielectric in capacitors and transistors, as an insulator to isolate various electronic parts, and in other applications.

In order to alter the rheological behaviour of cement systems, increase the reactivity of supplemental cementitious materials, and increase the strength and durability, SiO2 nanoparticles were utilised.

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C. Yes at -273°C (or -273.15°C, which is known as absolute zero). This is the temperature at which there is zero thermal energy and all matter theoretically ceases to move.

At this temperature, the Kelvin and Celsius scales have the same numerical value, as the Kelvin scale is defined relative to absolute zero. Yes, there is a temperature at which the Kelvin and Celsius scales agree, and that is absolute zero, which is equivalent to -273.15°C. The Kelvin scale is an absolute temperature scale that is defined based on the theoretical concept of absolute zero, where there is no thermal energy. The Celsius scale, on the other hand, is defined based on the melting and boiling points of water. At absolute zero, the temperature in Kelvin is zero, and there is no difference between the Kelvin and Celsius scales. So, both scales show the same numerical value at absolute zero. Therefore, the correct answer is c. yes at -273°C.

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Answer:

To strike or crash into with resounding impact. To collide or strike with great force. Used to indicate the sound of a forceful blow or collision.

Answer:

To strike or crash into with resounding impact. To collide or strike with great force. Used to indicate the sound of a forceful blow or collision.

Explanation:

Maximum energy stored at the time t = (L/R) ln 2 after the switch is closed

The magnetic field stops expanding when the current in a practical inductor achieves its steady-state value of Im = E/R. The power p = vi is also 0 because the voltage across the inductor has fallen to zero. As a result, the inductor's ability to store energy grows only as the current approaches its steady-state value.

The magnetic field's maximum stored energy is constant when the current is stable. The inductance of the practical inductor does not store any extra energy, but the inductor's resistance continuously loses energy. The magnetic field must continue to exist. current.
The area under the power curve represents the maximum energy stored by the inductance and is equal to the product of the average power and the elapsed time.

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