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Physics
Physics regards the physical aspects of the natural world. It includes topics that deal with forces on different bodies within the universe and phenomena that explain how the universe works.
500 Questions
When you drop a potato chip what kind of energy does it have as it falls?
Asked by Wiki User
When a potato chip, or any other object, falls, it has Potential Energy (energy of position) which is converted during the fall to Kinetic Energy (energy of motion).
Is a car on a circular track has also constant velocity?
Asked by Wiki User
Yes, IF it maintains constant speed on the track. The academic definition of velocity is speed and the associated direction, a vector. A car traveling in a circle is constantly changing direction. However, most people, including physicists when they are not writing textbooks, treat velocity and speed as interchangable such that a car going a constant speed on a circular track would be considered to have a constant velocity even though the direction in which it is traveling is constantly changing.
Will an airplane in horizontal flight when the thrust of the engine is equal to the drag of the air?
Asked by Wiki User
No, it won't. If enough power to only overcome drag were produced by the engine, the plane would still descend (or never take off!). Drag on the airplane represents a fraction of the energy (thrust) absorbed in flight. The largest absorber of energy is the weight of the aircraft. Defying gravity uses the lion's share of engine power. Both of these energy absorbers (drag and lift generation) need to be adequately addressed - at the same time - for an aircraft to fly "straight and level."
What Happens To Sound In Vacuum?
Asked by Wiki User
Sound cannot travel through a vaccum due to the fact that sound travels using vibrations and there is nothing to vibrate in a vaccum. for example on earth there is air for sound to travel through but in a vaccum there is no air.
And in all those battle scenes in star wars where you hear lasers firing through space and spaceships flying past you shouldn't be able to hear them :)
What m-word is defined as a device that changes sounds into electric current?
Asked by Wiki User
microphone
All the ways energy is used in home?
Asked by Wiki User
Energy can be used for cooking and heating up water. It can be used for lighting and electrical appliances as well, such as televisions, fans etc. In some ways, anything involving the switching on of a switch can be said to use energy.
Is the concord air craft faster than a bullet?
Asked by Wiki User
depends on the bullet different calibers from different guns travel at different speeds comcord traveled at twice the speed of sound
Of the reaction in a nuclear reactor must be controlled so that it may produce heat rather than a violent explosion?
Asked by Wiki User
A nuclear reactor cannot produce a nuclear explosion under any conditions. They can however produce steam explosions and hydrogen gas explosions.
One test reactor in Idaho (BORAX-I) was actually deliberately destroyed to verify the safety of a runaway reactor:
- four of its five control rods were almost removed
- the fifth control rod was ejected with a spring, making the reactor severely supercritical
- the resulting steam explosion blew the reactor completely apart (instantly returning it to a subcritical state, preventing any possibility of a nuclear explosion)
- severe contamination existed beyond a distance of half a mile (had the reactor been enclosed in a containment building most if not all of this would have been prevented)
Center of gravity on a rocket?
Asked by Wiki User
It is the point on the rocket where it balances it self, with the pull of gravity, and the amount of thrust it applies back on the ground to move up.
Is velocity of light constant?
Asked by Wiki User
Yes according to most theories the velocity of light in a vacuum is constant. (In water and glass it is slower!)
Materials that are not good conductors or and not good insulators are called?
Asked by Wiki User
Semiconductor
How do the forces of lift drag gravity and thrust affect the flight of an airplane?
Asked by Wiki User
Let's take the forces one-at-a-time starting with Thrust.
1. Thrust - is provided by the propeller or jet engine; thrust acts to move the plane forward into the air.
2. Lift - As the plane moves forward the shape of the wing (airfoil) causes a pressure difference that exerts an upward force on the wing -- the lift force. As thrust increases lift increases and the plane rises as lift overcomes the downward pull of gravity.
3. Gravity - the force that pulls objects back to Earth. In order to have an object like a plane rise higher the Lift force must be stronger than the pull of gravity. If a plane weighs 10,000 lbs (pull of Gravity) then Lift must be 10,001 lbs or more in order for the plane to rise.
4. Drag - Air moving over a surface experiences friction as the air molecules rub against the surface. Rough surfaces have more friction than smooth ones, but even smooth surfaces have some friction; the net effect is to oppose the forward motion and slow the airplane down. Thrust must be strong enough to overcome the total Drag and accelerate the plane to a speed that generates enough Lift to overcome Gravity and allow the plane to rise.
Why is landing on the moon different from landing on the earth?
Asked by Wiki User
The Moon is not the Earth. There is no atmosphere on the Moon. There is much less gravity on the Moon. You fly different vehicles on the Moon nd on the Earth.
What do you call a beam of light so powerful that it can cut through light?
Asked by Wiki User
laser beam
How do you make a balance beam?
Asked by Wiki User
it really doesn't matter i'm 8 and i think they're wooden but anything could work
You step on the brakes and slow the car to half speed If you release your foot will the car speed up or continue at half speed or slow down?
Asked by Wiki User
The car will continue at half-speed.
While you held the brake, the brake pads absorbed kinetic energy from the car's motion. The kinetic energy turned to heat, which, hopefully, was carried away in the air stream through the wheels. (If it doesn't blow away, then your brakes overheat.)
This was energy that was extracted from the gasoline you paid for. It blew away, and your car now has less kinetic energy ... i.e. less speed. If you want more speed again, you'll have to buy and burn more gas.
Here's an exception I can think of ... a case where the car might speed up to its original speed when the brake is released:
If you have the cruise control ON, it's supposed to drop out when you touch the brake. If the cruise is broke and it fails to cut out as it should, then when you release the brake, the cruise would try to take you back up to the speed it's set for.
This would be a dangerous situation.
Was the fahrenheit thermometer invented first?
Asked by Wiki User
Yes, Fahrenheit's scale was the first of the five main scales.
