A 1-kilogram coconut falls out of a tree from a height of 3 meters. Determine the coconut's kinetic energy.

Answers

Answer 1

Answer: You first would have to find the Gravitational Potential Energy of the coconut. This can be done by multiplying PE=mgh PE=(1)(9.81)(3) PE=29.43.
However, in order to find the KE of the coconut, you would need to specify on when in the coconuts fall you would like to know the KE.
For example, at the top of the tree, before it falls, the coconut has PE of 29.43J but KE of 0J. When the coconut is about to hit the ground, though, the coconut will have a KE of 29.43J and PE of 0J.
This is because of the Law of Conservation of Energy which states that energy is not created if destroyed.
In this system, PE is converted to KE and so at the end of the fall, the coconut has the same KE as the PE it had in the beginning.

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PLS HELP!! Which correctly identifies a type of heat transfer shown in the figure above?
C = radiation
B = conduction
A = convection
A = radiation

Answers

Answer:

conduction

Explanation:

Metals are good conductors of heat .
In the pic the thermal energy is conducted by the cooker and the food gets cooked.
Option B is correct

Answer:

$\sf B = conduction$

The period of a wave is found to be 50 seconds. What is the frequency of the wave?

Answers

Frequency is the inverse of the time period. The frequency of the wave will be 0.02.

What is the frequency?

Frequency is defined as the number of cycles per second. The time to make one complete cycle is frequency.

Frequency = 1 / period

F= 1 / T

F=1/50 sec

F=0.02 Hz.

Hence, the frequency of the wave will be 0.02.

To learn more about frequency refer to:

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If you remember this one rule, then you can always convert
in either direction between frequency and period.

   (Frequency) times (Period) = 1 .

So Frequency = 1 / period

   = 1 / (50 seconds)

   = (1/50) per second

   = 0.02 per second

   = 0.02 Hertz

Which of the following colors is associated with the lowest temperature? Explain your reasoning.A. Blue
B. Green
C. Yellow
D. Red

Answers

In general, A. Blue is associated with the lowest temperature because the light carries the least amount of energy when emitted, meaning that it can't "heat things up" as quickly.

Blue is associated with a low temperature.

Under what condition is the instantaneous acceleration of a moving body equal to its average acceleration over time?A. only at positive accelerations

B. only at negative accelerations

C. only at zero acceleration

D. only at constant accelerations

Answers

If the acceleration is constant (negative or positive) the instantaneous acceleration cannot be

Average acceleration: [final velocity - initial velocity ] /Δ time

Instantaneous acceleration = d V / dt =slope of the velocity vs t graph

If acceleration is increasing, the slope of the curve at one moment will be higher than the average acceleration.

If acceleration is decreasing, the slope of the curve at one moment will be lower than the average acceleration.

If acceleration is constant, the acceleration at any moment is the same, then only at constant accelerations, the instantaneuos acceleration is the same than the average acceleration.

Constant zero acceleration is a particular case of constant acceleration, so at constant zero acceleration the instantaneous accelerations is the same than the average acceleration: zero. But, it is not true that only at zero acceleration the instantaneous acceleration is equal than the average acceleration.

That is why the only true option and the answer is the option D. only at constant accelerations.

A photon with a wavelength of 2.29 × 10^–7 meter strikes a mercury atom in the ground state.Calculate the energy, in joules, of this photon. [Show all work, including the equation and
substitution with units.]

Answers

Answer:

Energy of photon, $E=8.64* 10^(-19)\ J$

Explanation:

It is given that,

Wavelength of photon, $\lambda=2.29* 10^(-7)\ m$

It strikes a mercury atom in the ground state. We have to find the energy of this photon. It can be calculated using below relation as :

$E=(hc)/(\lambda)$

Where

h is the Planck's constant

c is the speed of light

So, $E=(6.6* 10^(-34)\ J-s* 3* 10^8\ m/s)/(2.29* 10^(-7)\ m)$

$E=8.64* 10^(-19)\ J$

Hence, the above value is the energy of this photon.

detailed solution is attached

Four parallel-plate capacitors are constructed using square plates, and each has a dielectric inserted between the plates.?Rank the capacitance of each capacitor in order from highest to lowest.

A = side length (L/2) ; distance between plates (d) ; dielectric current (k)

B = side length (L) ; distance between plates (d/2) ; dielectric current (4k)

C = side length (2L) ; distance between plates (d) ; dielectric current (2k)

D = side length (L) ; distance between plates (2d) ; dielectric current (2k)

Answers

Final answer:

The capacitance of the four capacitors, ranked from highest to lowest, is B = C (they both have equal capacitance), followed by D, and then A.

Explanation:

The capacitance of a parallel-plate capacitor is given by C = εA/d, where ε is the permittivity of the dielectric material (which is equal to the product of the vacuum permittivity and the relative permittivity or dielectric constant k), A is the area of one of the plates, and d is the separation between the plates.

Applying this formula to the four capacitors and simplifying:

Capacitor A: Cap = k(0.5L)^2/d = 0.25kL^2/d
Capacitor B: Cap = 4k(L)^2/(0.5d) = 8kL^2/d
Capacitor C: Cap = 2k(2L)^2/d = 8kL^2/d
Capacitor D: Cap = 2k(L)^2/(2d) = kL^2/d

When ranked from highest to lowest capacitance, the order will be B = C > D > A.

Learn more about Capacitance here:

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