The direction of swing of a Foucault pendulum appears to change due to Earth’s

Answers

Answer 1

Answer: French Physicist Leon Foucault introduced his pendulum in 1851.
By that time, it was generally accepted that the Earth rotates, but
Foucault's pendulum was the first simple demonstration that made
the Earth's rotation easy to prove.

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A 2-kg object is moving 6 m/s in a horizontal direction.How much net force is required for this object to continue its state of motion?
Α. Ο Ν
B.
2N
C.
3 N
12 N

Answers

Answer: A) O N

Explanation:

An object in motion will maintain its state of motion. The presence of an unbalanced force changes the velocity of the object.

Two strings of equal length are stretched out with equal tension. The second string is four times as massive as the first string. If a wave travels down the first string with velocity v , how fast does a wave travel down the second string?

Answers

It travels at a velocity of "4v"

The Pangaea theory supports the theory of plate tectonics because _____.it is based on the idea that there were several land masses when Earth was first created
it is based on the idea that all the present continents were one supercontinent
it does not require scientists to support the notion that Earth's plates can move
one day, Earth will have one large land mass again

Answers

The Pangea theory supports the theory of plate tectonics because it is based on the idea that all the present continents were one super-continent. For reasons still unknown, the super-continent got separated and created separate smaller continents. This theory also supports the fact that this movement will continue until the day arrives when all the smaller continents will again merge in a different configuration to create another super-continent.

Answer:

Explanation:

ITS RIGHT

stone thrown vertically upward with speed of 15.5m/s from edge of cliff 75.0m high. how much later does it reach bottom of cliff?

Answers

Answer:

Approximately $5.66\; {\rm s}$ , assuming that $g = 9.81\; {\rm m\cdot s^(-2)}$ and that air resistance is negligible.

Explanation:

Let upward be the positive direction. Under the assumptions, acceleration of the stone would be $a = (-g) = (-9.81)\; {\rm m\cdot s^(-2)}$ (negative since the stone is accelerating downward.)

The duration of the flight can be found in the following steps:

Find velocity right before landing given displacement, initial velocity, and acceleration.
Find duration of the flight from acceleration and the change in velocity.

In SUVAT equation $v^(2) - u^(2) = 2\, a\, x$ :

$v$ is the final velocity right before landing (needs to be found,)
$u = 15.5\; {\rm m\cdot s^(-1)}$ is the initial velocity,
$a = (-9.81)\; {\rm m\cdot s^(-2)}$ is acceleration, and
$x = (-75.0)\; {\rm m}$ is displacement (downward because the stone landed below where it was launched.)

Rearrange this equation to find $v$ :

$\begin{aligned}v &= \sqrt{u^(2) + 2\, a\, x} \n &= \sqrt{(15.5)^(2) + 2\, (-9.81)\, (-75.0)} \; {\rm m\cdot s^(-1)} \n &\approx -40.05\; {\rm m\cdot s^(-1)}\end{aligned}$ .

In other words, the velocity of this stone has changed from the initial value of $u = (15.5)\; {\rm m\cdot s^(-1)}$ to $v \approx (-40.05)\; {\rm m\cdot s^(-1)}$ during the flight. Divide the change in velocity by acceleration $a = (-9.81)\; {\rm m\cdot s^(-2)}$ (the rate of change in velocity) to find the duration of the flight:

$\begin{aligned}t &= (v - u)/(a) \n &\approx ((-40.05) - (15.5))/((-9.81))\; {\rm s} \n &\approx 5.66\; {\rm s}\end{aligned}$ .

In other words, the stone would be in the air for approximately $5.66\; {\rm s}$ .

Carol can be defined as a social drinker because she can easily limit drinking and she chiefly drinks alcohol when she is out with friends or family members. True or False?

Answers

True. These are the characteristics of a social drinker.

It is true, just took the test

A mirror with a flat surface is aA. plane mirror.
B. convex mirror.
C. concave mirror.
D. virtual mirror.

Answers

This kind of a mirror is called a Plane mirror.

Other types mentioned here are not flat surfaces.

Answer:

The correct answer is option A, Plane Mirror

Explanation:

A plane mirror has a flat surface while remaining concave and convex mirror have bulging surfaces. A concave mirror is a converging mirror while a convex mirror is a diverging mirror. Having a planar surface, the angle of incidence and reflection is equal in a plane mirror. There is nothing like a virtual mirror however the mirrors have the ability to form virtual image.

Thus among all the options, option A is correct

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