A boat moving at a constant speed travels 15 meters in 8 seconds. How far does it travel
in 40 seconds?
0 75 meters
53 meters
335 meters
0 480 meters​

Answer:

40.18m

Explanation:

9.8 m/s/s is gravity.

9.8*4.1=40.18m

Answer:

7.5secs

Explanation:

Using the equation of motion

v = u + at

v is the final velocity = 0m/s

u is the initial velocity = 9m/s

a is the deceleration = -1.2m/s²

t is the required time

Substitute;

0 = 9 + 1.2(t)

-9 = -1.2t

t = -9/-1.2

t = 7.5secs

hence it takes the child 7.5secs to stop

Answer:

On Waves. Quantum mechanically, an electron can be described by a wave function oscillating in space and time that has mean values equal to the expectation values of observables corresponding to given operators. ... Electrons are fermions. They are charged particles. in short the quantum theory

i hope its helpful !

I study in astronymy in College I had a question like this.

Long-period comets are set in motion towards the Sun from the Oort cloud by gravitational perturbations caused by passing stars and the galactic tide. Hyperbolic comets may pass once through the inner Solar System before being flung to interstellar space. The appearance of a comet is called an apparition.

Answer:

To obtain the thickness of the solid by dividing its volume by its length and its width

Explanation:

Example:

we divide 24 cm3 by 4 cm and 3 cm. In this example, the thickness of the solid is 2 cm. (NOT THE ANSWER! JUST AN EXAMPLE)

I hope this helps =)

Answer:

B is the right answer

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Expression for T₁, the tension in cable 1, that does not depend on T₂ would be: T₁ = W - k.

Assuming that the cables are massless and there is no friction involved, the tension in each cable can be determined by considering the forces acting on the object being lifted.

Let T₁ be the tension in cable 1, T₂ be the tension in cable 2, and W be the weight of the object being lifted.

In equilibrium, the sum of the forces in the vertical direction is equal to zero. Therefore, we have:

T₁ + T₂ - W = 0

Solving for T1, we get:

T₁ = W - T₂

Therefore, an expression for T₁ that does not depend on T₂ would be:

T₁ = W - k

where k is a constant value representing the tension in cable 2, which is assumed to be known.

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Answer:

radius=4.77cm

Explanation:

given

r=? ,h=14 , v=1000

then using the formula

\(r = \sqrt{ \frac{v}{\pi \: h} } \)

= √1000/π•14

=4.77cm

Answer:

-89.22 C and 183.94 K

Explanation:

TC= (-128.6 - 32) / 1.8 = -89.222222 C

TK= -89.22 + 273.16 = 183.94

The conversion of −128.6°F temperature in degree centigrade -89.22 is

and to kelvin is 183.94 k

Fahrenheit temperature scale is a scale based on 32 for the freezing point of water and 212 for the boiling point of water, the interval between the two being divided into 180 parts.

The 18th-century German physicist Daniel Gabriel Fahrenheit originally took as the zero of his scale the temperature of an equal ice-salt mixture

and selected the values of 30 and 90 for the freezing point of water and normal body temperature, respectively; these later were revised to 32 and 96, but the final scale required an adjustment to 98.6 for the latter value.

To convert from fahrenhiet to degree celcius

\(T_C= \dfrac{(-128.6 - 32) }{ 1.8} = -89.222222 \ ^oC\)

To convert from kelvin to degree

\(T_K= -89.22 + 273.16 = 183.94\ k\)

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Assume the system is big enough to consider the charges as small test charges. E= 3.8 × 10^4 N/C

The magnitude of the electric field at a point in space due to a point charge is given by the Coulomb's law as:

E = k * Q / r^2

where k is Coulomb's constant, Q is the charge, and r is the distance from the point charge.

In this case, the electric field magnitude at the point due to the 10 nC charge is given as 1900 N/C. So we can solve for k using the given values:

k = E * r^2 / Q

k = 1900 N/C * (1 m)^2 / (10 nC)

k = 1.9 × 10^11 N·m^2/C^2

Now, we can use this value of k to find the magnitude of the electric field when the charge is replaced by 20 nC:

E' = k * Q' / r^2

E' = (1.9 × 10^11 N·m^2/C^2) * (20 nC) / (1 m)^2

E' = 3.8 × 10^4 N/C

Therefore, the magnitude of the electric field when the 10 nC charge is replaced by a 20 nC charge would be 3.8 × 10^4 N/C.

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Answer:

Heat stroke

Explanation:

Answer:25

Explanation:

Formula(77°F − 32) × 5/9 = 25°C

Answer: The answer is C. 298 K

Explanation:

Answer:

The only time an object has NO kinetic energy is when the velocity is "Zero"

Explanation:

The object starts out with no kinetic energy and potential energy of PE = mgh where m is the mass.The kinetic energy is zero. As the object falls it loses potential energy and gains kinetic energy KE = mv2/2.

Hope I help you

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It is possible that when an object is stationary and not moving, it has no kinetic energy.

Only when an item is entirely at rest does it have no kinetic energy. The energy an object possesses as a result of its motion is known as kinetic energy. It is based on the object's mass and velocity.

When an object is not moving and has no velocity, it also has no kinetic energy.

According to the kinetic energy formula,

KE = 1÷2 × mass × velocity², if the velocity is zero, the entire term involving velocity becomes zero, resulting in zero kinetic energy.

Thus, when an object is stationary and not moving, it has no kinetic energy.

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Answer:

2.4 secs.

Explanation:

Current (A) = Charge (coulomb)/Time(sec)

We are looking for time. So:

Time (sec) = Charge (coulomb)/Current (A)

↓

12coulombs/5.0A = 2.4 secs

Answer:The Answer Is D

Explanation:

The width of the central bright fringe becomes wider in the resulting diffraction pattern of a single-slit diffraction experiment.

Diffraction of light is the act of bending light around corners such that it spreads out and brightens areas where a shadow is predicted. In general, it is difficult to discern between diffraction and interference because both take place concurrently. The silver lining we observe in the sky is due to light diffraction. When the sunshine breaks through or catches the cloud, a silver lining appears in the sky.

We can investigate the phenomenon of light bending, or diffraction, in the single-slit diffraction experiment. This phenomenon permits coherent light from a source to interfere with itself and produce the diffraction pattern, a discernible pattern on the screen. Diffraction is visible when the sources are small enough to be compared to the wavelength of light.

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The Earth's atmosphere consists of several distinct layers, each with its own unique characteristics. From the ground up, these layers are organized in the following order: troposphere, stratosphere, mesosphere, thermosphere, and exosphere.

The troposphere is the lowest layer of the atmosphere, extending from the Earth's surface up to approximately 8 to 15 kilometers in altitude. This layer contains most of the Earth's weather phenomena, such as clouds, rain, and snow. Temperature decreases with altitude in the troposphere. Above the troposphere is the stratosphere, which extends from around 15 to 50 kilometers above the Earth's surface. The ozone layer, which absorbs and scatters ultraviolet solar radiation, is located in this layer. Temperature increases with altitude in the stratosphere due to the absorption of UV radiation by the ozone. The mesosphere is not mentioned in the original question but is the next layer above the stratosphere, extending from approximately 50 to 85 kilometers in altitude. In this layer, temperature decreases with altitude, and meteors often burn up upon entering the mesosphere.

Above the mesosphere is the thermosphere, extending from around 85 to 600 kilometers above the Earth's surface. This layer contains the ionosphere, which is important for radio communications. The temperature increases with altitude in the thermosphere due to the absorption of solar radiation by the few gas particles present. Finally, the exosphere is the outermost layer of the Earth's atmosphere, extending from about 600 kilometers to the edge of space. In this layer, gas particles are widely dispersed, and the boundary between the exosphere and outer space is indistinct.

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The reaction order of species D can be determined by comparing the rate of reaction at different concentrations of D while keeping the concentrations of other species constants. By analyzing the given data, we can determine the reaction order of D.

To determine the reaction order of species D, we can examine how the initial rate of reaction changes with varying concentrations of D. The initial rate is given as the rate of reaction (k) multiplied by the concentration of D raised to the power of its reaction order (n). By comparing the initial rates at different concentrations of D while keeping the concentrations of other species constant, we can determine the reaction order of D.

Looking at the provided data, we can observe that when the concentration of D is doubled while keeping the concentrations of other species constant, the initial rate approximately doubles as well. This indicates that the reaction order of D is 1, as the rate is directly proportional to the concentration of D. This means that the rate equation can be expressed as rate = k[D]^1, or simply rate = k[D].

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The final temperature of water is equal to 50.9999°C

Given the following data:

To determine the final temperature of water:

Mathematically, quantity of heat is given by the formula;

\(Q=mc\theta\)

Where:

Substituting the given parameters into the formula, we have;

\(5000=2.38892 \times 10^{-2}\times 4186 \times \theta\\\\5000=100.0001912 \theta\\\\ \theta=\frac{5000}{100.0001912} \\\\ \theta=49.9999^{\circ}C\)

For the final temperature:

\(\theta = T_2 - T_1\\\\T_2 = \theta+T_1\\\\T_2 = 49.9999 + 50\)

Final temperature = 50.9999°C

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Answer: b) - 8.0 \(m/s^{2}\)

Explanation: Acceleration is a vector indicating a rate an object's velocity changes over time:

a = \(\frac{v}{t}\)

and its SI unit is \(m/s^{2}\)

For the minivan to stop, it takes a period of 0.5s:

a = \(\frac{4.0}{0.5}\)

a = 8.0 \(m/s^{2}\)

As a vector, acceleration has magnitude (8\(m/s^{2}\)) and direction. Since it is stopping, the minivan has a direction opposite to the other car, which means acceleration is negative. So: a = \(- 8.0 m/s^{2}\).

Explanation:

Given mass of the object is 1200kg and it's placed at a height of 45m above the ground. As we know that potential energy is ,

\(\longrightarrow PE = mgh \)

where,

Substituting the respective values ,

\(\longrightarrow P.E. = 1200kg * 10m/s^2* 45m\)

Multiply ,

\(\longrightarrow P.E. = 540000J \)

Hence the potential energy is 540000J .

I hope this helps.

A change in the magnetic field surrounding the conductor induces a voltage in the conductor, this induced voltage is known as Self-Inductance.

In order to cause a current to flow as a result of a shifting magnetic field, a process known as electromagnetic induction must be used.

A current will be induced in a coil of wire if the coil is placed in a magnetic field that is changing. Since there is an electric field causing the charges to be forced around the wire, current is flowing as a result. Since the charges are initially stationary, it cannot be the magnetic force.

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The new energy loss per day would be 15 kWh.

Loss of energy occurs as energy in a system moves from inside the system to outside it. This can occur in terms of temperature, movement, etc.

Fortunately, energy loss can be reduced to make the system more efficient, this is possible through strategies such as increasing insulated areas and controlling energy flux.

In the system presented we know the previous energy loss was 60kWh. But two strategies have been used to decrease it:

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We have that for the Question  the possible resistances are and the diagram displaying the model of the circuit is attached below

From the question we are told

From the description we have

R_2R_3=28.25

Generally the equation for the Total R   is mathematically given as

\(R_t=R_3+\frac{R1+R_2}{R_1+R_2}\\\\Therefore\\\\10=R_3+\frac{R1+R_2}{R_1+R_2}\\\\2R3-3R2=5.875 \\\\\)

Hence

From the two distinct equations

\(R2=\frac{28.35}{R3}\)

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Answer:

4.31×10⁹Hz

Explanation:

v=2.5×10³ms⁻¹    wavelength=5.80×10⁻⁷m

v=frequency × wavelength

2.5×10³=f×5.80×10⁻⁷

f=4.31×10⁹Hz

The frequency of the wave is 4.3 × 10⁹Hz

HOW TO CALCULATE FREQUENCY OF A WAVE:

f = v/λ

Where;

f = frequency (Hz)

v = speed of the wave (m/s)

λ = wavelength (m)

f = v/λ

f = 2.5 × 10³ ÷ 5.80 x 10-⁷

f = 2.5/5.80 × 10³+⁷

f = 0.43 × 10¹⁰

f = 4.3 × 10⁹Hz or s-¹

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Answer:

yes   1000 j   as I posted on the same Q elsewhere

Explanation:

Answer:

Thank you so much!

Explanation:

Answer:

joe

Explanation:

mama