PHYSICS HIGH SCHOOL

An object is dropped from the edge of a cliff and is moving at 26.5 m/s just before it hits the ground. How high is the cliff?11.0 m

260 m

35.8 m

848 m

Answers

Answer 1

Answer:

Answer:

35.8 m

Explanation:

An appropriate formula is ...

$V_f^2-V_i^2=2ad$

The initial velocity is 0, and the acceleration due to gravity is 9.8 m/s², so the distance, d, is ...

$d=(26.5^2)/(2\cdot 9.8)\approx 35.8 \quad\text{m/s}$

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Light traveling through air at 3.00 · 10^8 m/s reaches an unknown medium and slows down to 2.00 · 10^8 m/s. What is the index of refraction of that medium? n =

Answers

v 1= 3.00 · 10^8 m/s
v 2 = 2.00 · 10^8 m/s
The index of refraction:
n = v 1 / v 2 = 3.00 · 10^8 m/s : 2.00 · 10^8 m/s = 1.5
Answer:
The index of refraction of that medium is 1.5

Answer

The index of refraction of medium is 1.5 .

Explanation:

Equation for index of refraction is given by .

$n = (c)/(v)$

Where n is index of refraction in medium , v is speed of light in the medium and c is the speed of light in air .

As given

Light traveling through air at $3.00* 10^8$ m/s reaches an unknown medium and slows down to $3.00* 10^8$ m/s.

$c = 3.00* 10^(8)$

$v = 2.00* 10^(8)$

Putting the values in the formula

$n = (3.00* 10^(8))/(2.00* 10^(8))$

Solving the above

n = 1.5

Therefore the index of refraction of medium is 1.5 .

Discuss how the hardness or softness of the landing surface is related to the time required to stop the egg

Answers

Answer

To understand this concept it is necessary to understand Newton's Second Law

According to Newtons Second law applied force is equal to rate of change of momentum of a body.

Mathematically,

$F=(dp)/(dt)$

here, $(dp)/(dt)$ is rate of change of momentum with respect to time

It means If two eggs fall from same height,one on softer surface and other on hard surface that time the momentum of both eggs will remain equal at both the surfaces. But, impact time will be different. On hard surface egg will stop almost instantly so impact time will be small and hence the force on egg will be large therefore the egg will breakup.

On the other hand on the soft surface like a cotton, egg will not stop instantly but it will slow down for a few seconds and then stop due to which the time of impact will increase. Therefore the force on egg will be less and it won't break up.

Amendments to the Constitution can be proposed bythe president and vice president.Congress and state legislatures.the president and the Supreme Court.Congress and the Supreme Court.

Answers

Amendments to the Constitution can be proposed by the Congress and state legislatures. As written in Article V of the Constitution, the authority to amend the constitution lies with a two thirds majority vote in the House of Representatives and Senate or by a constitutional convention called by two thirds of the state legislatures.

Mary walked north from her home to Sheila's home, which is 4.0 kilometers away. Then she turned right and walked another 3.0 kilometers to the supermarket, which is 5.0 kilometers from her own home. She walked the total distance in 1.5 hours. What were her average speed and average velocity?

Answers

It would be 5.666667 km per hour.

well her speed and velocity are the same 8 kilometers per hour

The product of the frequency and the wavelength of a wave equals thea. number of waves passing a point in a second.
b. speed of the wave.
c. distance between wave crests.
d. time for one full wave to pass.

Answers

Answer:

b. speed of a wave

Explanation:

The speed of a wave is defined as the product between the wave's frequency and the wave's wavelength:

$v=\lambda f$

where

$\lambda$ is the wavelength of the wave

f is the frequency

Therefore, we see that this matches the definition listed in choice B:

b. speed of the wave.

The other options are:

a. number of waves passing a point in a second. --> frequency

c. distance between wave crests. --> wavelength

d. time for one full wave to pass. --> period

Final answer:

The product of the frequency and wavelength of a wave equals the speed of the wave. This is a fundamental principle in wave mechanics in physics.

Explanation:

The product of the frequency and the wavelength of a wave equals the speed of the wave. This is a fundamental principle in physics related to wave mechanics. To illustrate, if you have a wave with a frequency of 2 Hz and a wavelength of 3 meters, the speed of the wave would be 2 Hz * 3 m = 6 m/s.

Here, the frequency corresponds to how often the wave oscillates up and down per second, whereas the wavelength is the distance between successive wave crests. Together, they dictate the speed of the wave.

Learn more about Wave Mechanics here:

brainly.com/question/24459019

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Which one of the following lenses is a converging lens? A) convexo-concave lens B) Plano-concave lens C) double-convex lens. D) spherical-convex lens

Answers

A converging lens (or convex lens) is curved on both sides. This means the light rays coming out of it come together at a point – they converge. Diagram of how a lens works. The point at which the light rays meet is called the focal point.sooo.......D

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