What how what why when whtat dh?

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Related Questions

A) A block of mass, m, is pushed up against a spring, compressing it a distance x, and is then released. The spring projects the block along a frictionless horizontal surface, giving the block a speed v. The same spring projects a second block of mass 4m, giving it a speed 3v. What distance was the spring compressed in the second case?B) Initially a body moves in one direction and has kinetic energy K. Then it moves in the opposite direction with three times its initial speed. What is the kinetic energy now?
The change in pitch of a train's horn as it passes while you are standing still can be explained by A. the Doppler effect. B. ultrasonic vibrations. C. sympathetic vibration. D. resonance.
What is a wavelength?a. the highest part of the wave b. the distance between two wave troughs c. the speed of energy of the wave d. the lowest part of the wave
A toy mouse has a mass of 4 kg and kinetic energy of 32 J. What is its speed? A. 6 m/s B. 3 m/s C. 5 m/s D. 4 m/s
_____ kilometers per second is the approximate speed of light.a. 300 b. 3,000 c. 30,000 d. 300,000

Radio waves travel at 3.00 · 108 m/s. Calculate the wavelength of a radio wave of frequency 900 kHz. (9.00 · 105 Hz.)_____ m

2.70 x 1014
3.70 x 10-15
3.33 x 102
3.00 x 10-3

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v: velocity of wave
f: frequency
L: wavelenght

v = fL => L = v/f => L = (3x10^8)/(900x10^3) => L = 3.33 x 10^2m

Which theory states that if you are forced to smile at an event, you will enjoy it? A. The Schachter-Singer theory B. The Lazarus theory C. The facial feedback theory D. The opponent-process theory

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Answer:

C. The facial feedback theory

Explanation:

The facial feedback theory as postulated by William James and connects back to the famous Charles Darwin talks about how facial expressions stimulate our emotional state of being. Based on this theory, the emotional experiences we have are determined by the looks on our faces.

According to the question, smiling at an event makes you enjoy it is an example of what the The facial feedback theory is explaining. Furthermore, smiling, which is a facial expression causes or stimulates an emotional state of enjoyment in that event.

What happens when a roller coaster car moves down from the top of a hill?

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Answer:

Gravitational potential energy is converted into kinetic energy

Explanation:

At the top of the hill, the roller coaster car has gravitational potential energy, which is given by:

$U=mgh$

where m is the mass of the car, g is the gravitational acceleration, h is the height of the hill.

As the car descends the hill, it gains speed (v), so it also gains kinetic energy, given by:

$K=(1)/(2)mv^2$

where v is the speed of the car.

The mechanical energy of the car is the sum of its potential energy and kinetic energy:

$E=U+K$

In absence of friction, the law of conservation of energy states that the mechanical energy of the car is constant. Therefore, since as the car moves down the hill the potential energy decreases (because the height, h, decreases), it means that the kinetic energy must increase (and this is wy the speed increases). So we can say that gravitational potential energy is converted into kinetic energy.

When the roller coaster moves down from the top of the hill, all of its stored potential energy is converted into kinetic energy to move it and when it goes back up the hill it turns kinetic into potential.

How and why can two lethal elements combine to form an essential
compound for health?

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Answer:

Two lethal elements can combine to form an essential compound for health by undergoing a chemical reaction such that the properties of the individual elements are different from the properties of the product and are no more lethal

Example Mercury and Sulfur combine to form cinnabar which is used as a medicine to relieve pain, antiseptic, and to cure diseases

Mercury and sulfur combines because mercury readily combines with sulfur at high temperatures

Explanation:

Mercury is a lethal element that also has harmful effects on the neurological system

Sulfur is lethal when too much of it is consumed

Beyond what point must an object be squeezed for it to become a black hole

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Answer:

Schwarzschild radius

Explanation:

A black hole is defined as that object from which light cannot escape form the surface of the object because object is very small an very dense. There are numerous black hole sin the universe.

Black hole is well understood by the concept of "escape velocity". Escape velocity is the speed of any object to break the gravitational pull from another object.

Escape velocity depends on mass of the object and the distance from the center of the object ( how big or small the object is ). If the object is smaller or more denser, than the escape velocity is more. If we squeeze our earth to a radius of about 9 mm sphere, then the escape velocity of any object becomes equal to the velocity of light.

And the radius of any object which have an escape velocity which is same as the velocity of light is known as the 'Schwarzschild radius'.

Any object which is smaller than the "Schwarzschild radius' has an escape velocity more than the speed of light and is termed as a black hole.

Thus, any object which is squeezed beyond the Schwarzschild radius be becomes a black hole.

A 700-watt gasoline engine and a 300-watt electric motor both do 3 J of work. Which machine can do the work faster? Explain your answer.

Answers

700 W gasoline engine do the work faster than electric motor.
What define time of execution of a work is power.
If gasoline engine has 700 W so it is faster than electric motor that has only 300 W

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