Physics High School
Wind . . . moving air, has kinetic energy; not a wave at all
Lightning . . . a pile of too many electrons falling over and pouring
down to either a cloud or the ground; not a wave at all
Natural gas . . . a substance that is easy to burn in air and releases
a lot of chemical energy in the form of heat when you
burn it; not a wave at all
Ultraviolet light . . . A wave, as well as an an electromagnetic one. yay x 2.
Radio waves, Light waves, thermal radiation, X ray, visible light, microwave, infrared, gamma rays etc. are the example of electromagnetic waves. These waves together form the electromagnetic spectrum (https://physics.tutorvista.com/waves/electromagnetic-waves.html)
The study of the stars and planets
Astronomy is the study of stars and planets.
A 50 g sample of an unknown metal is heated to 90.0C. It is placed in a perfectly insulated container along with 100 g of water at an initial temperature of 20C. After a short time, the temperature of both the metal and water become equal at 25C. The specific heat of water is 4.18 J/gC in this temperature range. What is the specific heat capacity of the metal? Record your answer with two significant figures. J/gC
Q = mcΔT
Qwater = -Qmetal
(100 g)(4.18 J/g°C)(25°C - 20°C) = -(50 g)c(25°C -90.0°C)
2090 J = (3250 g °C)c
c = 0.643J/g °C
The specific heat capacity of the metal, given the data is 0.6 J/gºC
Data obtained From the question
- Mass of metal (M) = 50 g
- Temperature of metal (T) = 90 °C
- Mass of water (Mᵥᵥ) = 100 g
- Temperature of water (Tᵥᵥ) = 20 °C
- Equilibrium temperature (Tₑ) = 25 °C
- Specific heat capacity of the water (Cᵥᵥ) = 4.18 J/gºC
- Specific heat capacity of gold (C) =?
How to determine the specific heat capacity of the metal
Heat loss = Heat gain
MC(T –Tₑ) = MᵥᵥC(Tₑ – Tᵥᵥ)
50 × C × (90 – 25) = 100 × 4.18 × (25 – 20)
C × 3250 = 2090
Divide both side by 3250
C = 2090 / 3250
C = 0.6 J/gºC
Learn more about heat transfer:
Plants make food through photosynthesis, a chemical reaction. What are the starting substances of the reaction? hydrogen, oxygen, and carbon
oxygen, solar energy, and water
carbon dioxide, solar energy, and oxygen
carbon dioxide, water, and solar energy
carbon dioxide, water and solar energy.
- Equation is attached in the picture.
- Carbon do oxide, water & sunlight combine to form Glucose & Oxygen. Glucose is utilized as energy by plant cells where as the oxygen is released into the atmosphere.
- This reaction is catalyzed by chloroplast and chlorophyll enzymes.
- This process of converting Carbon dioxide to Oxygen is known as photosynthesis.
carbon dioxide, water and solar energy.
A ball rolls up a ramp until it stops and turns around. It then rolls back down. At what position is its potential energy the greatest? when it reaches the highest point on the ramp
when it is traveling fast at the bottom of the ramp heading up
as it slows down halfway up the ramp
as it speeds back up, heading back down the ramp
Potential energy is the energy possessed by an object due to its position relative to a reference line. Potential energy is given as
PE = mgh
where m = mass of the object
g = acceleration due to gravity
h = height from the reference line.
from the formula , we see that potential energy is directly proportional to the height. hence greater the height, larger will be the potential energy.
hence the potential energy is greatest when
when it reaches the highest point on the ramp
When it reaches the highest point on the ramp
What is the kinetic energy of a 2,000-kg truck that moves at 5.0 m/s? 10,000 J, 50,000 J, 25,000 J, or 2,500 J
Final answer: 25,000J
In which of the following situations does not include kinetic energy? A.) a baseball in a catcher’s glove
B.) a lady walking slowly across the street
C.) a hockey puck sliding on the ice
D.) a man running around a track
A.) a baseball in a catcher’s glove
because nothing is moving in this scenario. Kinetic energy requires movement
A.)a baseball in a catchers glove..........because there is no movement
The vertical displacement of the wave is measured from the ? equilibrium to the crest and is called the frequency.
crest to the trough and is called the amplitude.
trough to the trough and is called the wavelength.
equilibrium to the crest and is called the amplitude.
The whole question is talking about the amplitude of a wave
that's transverse and wiggling vertically.
Equilibrium to the crest . . . that's the amplitude.
Crest to trough . . . that's double the amplitude.
Trough to trough . . . How did that get in here ? Yes, that's
the wavelength, but it has nothing to do
with vertical displacement.
Frequency . . . that's how many complete waves pass a mark
on the ground every second. Doesn't belong here.
Notice that this has to be a transverse wave. If it's a longitudinal wave,
like sound or a slinky, then it may not have any displacement at all
across the direction it's moving.
It also has to be a vertically 'polarized' wave. If it's wiggling across
the direction it's traveling BUT it's wiggling side-to-side, then it has
no vertical displacement. It still has an amplitude, but the amplitude
is all horizontal.
the answer is A.
when the image of a distant object is brought into focus in front of a person's retina, the effect is called
When the image of a distant object is brought into focus in front of a person's retina, the defect is callednearsightedness.
Which of the following is the best example of uniform circular motion? A.The motion of the second hand on a clock
B.A child swinging on a park swing
C.A golf ball after it has been hit off the tee
D.A skier curving back and forth across a wide slope
The only choice that describes ANYTHING moving in a circle is ' A '.
The park swing and the skier go back and forth.
The golf ball goes up and then down, once.
A solid aluminum cube has sides each of length L . A second cube of the same material has sides two times the length of the first cube; i.e., 2 L . Compared to the first cube, what is the density of the second cube?
Density is a material property, so the second cube will have the same density as the first.
Density is a property of the substance, no matter how much of it you have. A microscopic speck of it and a truckload of the same stuff have the same density.
A train starts from rest and accelerates uniformly, until it has traveled 3.7 km and acquired a velocity of What is the acceleration of the train during this time?
The train's average acceleration during this time is
(7.4 km) / (the time taken)² .
The final velocity is not given in the question ... there's a
place for it, but the number disappeared. In order to
answer the question, we need to know either the final
velocity or else the time taken by the story.
For safety concerning a curve, you should: A. decelerate before the curve
B. accelerate while driving up the curve
C. shift to a higher gear
D. adjust your speed to the current road conditions
The question is asking us what you should do "For safety concerning a curve. The correct answer is that you should : A. decelerate before the curve, this would reduce your speed, and also the time needed to break, so you will have more time to react to the environment and also you would need less time if you see someone on the road and decide to break.
For safety concerning a curve, you should:
A. decelerate before the curve
A steel ball is dropped from a building's roof and passes a window, taking 0.12 s to fall from the top to the bottom of the window, a distance of 1.20 m. It then falls to a sidewalk and bounces back past the window, moving from bottom to top in 0.12 s. Assume that the upward flight is an exact reverse of the fall. The time the ball spends below the bottom of the window is 1.76 s. How tall is the building?
The top of theWINDOW is 19 meters from the ground. also steel balls dont bounce.
Which statement best compares momentum and kinetic energy?
If your options are:
A.Both momentum and kinetic energy are vector quantities.
B.Momentum is a vector quantity and kinetic energy is a scalar quantity.
C.Kinetic energy is a vector quantity and momentum is a scalar quantity.
D.Both momentum and kinetic energy are scalar quantities.
The answer on the question givenis letter B.Momentum is a vector quantity and kinetic energy is a scalar quantity.
A startled armadillo leaps upward, rising 0.532 m in the first 0.202 s. (a) What is its initial speed as it leaves the ground? (b) What is its speed at the height of 0.532 m? (c) How much higher does it go? Use g=9.81 m/s2.
0.532 m = 0.202v_0 + ½(-9.81 m/s²)(0.202 s)²
v_0 = 3.62 m/s
0.532 m = ½(v + 3.62 m/s)(0.202) s
v = 1.65 m/s
At the highest point v = 0, so
0 = (1.65 m/s)^2 + 2(-9.81 m/s²)d
d = 0.139m
Select all the answers that apply. Biological evidence of the age of the earth includes _____.
(1)radioactive dating of rocks
(5)gradual processes of rock formation
1,2,5 are correct answers.
A particular planet has a moment of inertia of 9.74 × 1037 kg•m2 and a mass of 5.98 × 1024 kg. Based on these values, what is the planet’s radius?
Assuming the planet can be treated as a solid sphere,
(9.74 x 10^37 kg-m²) = (2/5)(5.98 x 10^24 kg)R²
R = 6.38 x 10^6 m
A man with a mass of 60 kg walks up two flights of stairs in going from the first floor to the third floor (10 meters). Calculate his increase in potential energy. _____ J
PE = mgh = (60 kg)(9.81 m/s²)(10 m) = 5,886 J
which is pretty close to 5900
A man with a mass of 60 kg walks up two flights of stairs in going from the first floor to the third floor (10 meters). Calculate his increase in potential energy. _____ J 240,000 12,000 59,000 5900
The increase in potential energy of the man of 60 kg when walks up two flights of stairs in going from the first floor to the third floor (10 meters) is 5880 J .
What is potential energy?
Potential energy of an object is the energy generated by virtue of its position. It is the stored form of energy when the object is at rest. When the object starts moving, its potential energy converts to kinetic energy.
The potential energy of an object is dependent on the mass, height and the acceleration due to gravity g as follows:
p = mgh
given, mass of the man = 60 kg
height covered = 10 meters
g of earth = 9.8 m/s²
then, p = 60 kg × 10 m × 9.8 m/s² = 5880 J.
Therefore, the increase in potential energy of the man is 5880 J.
Find more potential energy :
PE = mgh
= 60kg * 9.8m/s² * 10 m = 5888 J ≈ 5900 J
A wave is traveling through X. What can be known about X?
X can probably be vacuum through space through air and or solid objects
- Gamma ray.
- Infrared ray.
- UV ray.
- Visible light.
- Radio waves.
In order from highest to lowest energy, the sections of the EM spectrum are named: gamma rays, X-rays, ultraviolet radiation, visible light, infrared radiation, and radio waves.Which of the following waves is an electromagnetic wave? ›
Radio waves, television waves, and microwaves are all types of electromagnetic waves.What are examples of electromagnetic energy? ›
Visible light, radio waves and X-rays are examples of electromagnetic radiation (EMR). EMR is energy transmitted through empty space or through matter as electromagnetic waves.What are the 7 example of electromagnetic waves? ›
Radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays are the 7 types of electromagnetic waves.Which is not an electromagnetic wave? ›
Electromagnetic spectrum consists of radio waves, microwaves, infrared waves, visible spectrum, ultraviolet waves, X-rays and gamma rays. It does not include alpha rays.Which is an example of electromagnetic energy quizlet? ›
Electromagnetic radiation is energy that travels in waves. Some examples of electromagnetic radiation are visible light, radio waves, and x-rays.Which of the following is an electromagnetic wave quizlet? ›
They waves include radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays.What is an electromagnetic wave quizlet? ›
A electromagnetic wave is a transverse wave that involves the transfer of electric and magnetic energy. An electromagnetic waves is made up of vibrating electric and magnetic fields that move through space or some medium at the speed of light.What are some examples of electromagnetic waves quizlet? ›
What are some types of electromagnetic waves? Radio waves, microwaves, infrared waves, visible light, ultraviolet waves, X-rays, and gamma rays are all electromagnetic waves.
Electromagnetic energy travels in waves and spans a broad spectrum from very long radio waves to very short gamma rays. The human eye can only detect only a small portion of this spectrum called visible light.What are the 7 types of electromagnetic waves and their uses? ›
- Radio waves - radio and television.
- Microwaves - satellite communications and cooking food.
- Infrared - Electrical heaters, cooking food and infrared cameras.
- Visible light - Fibre optic communications.
- Ultraviolet - Energy efficient lamps, sun tanning.
- X-rays - Medical imaging and treatments.
Everyday life is pervaded by artificially made electromagnetic radiation: food is heated in microwave ovens, airplanes are guided by radar waves, television sets receive electromagnetic waves transmitted by broadcasting stations, and infrared waves from heaters provide warmth.What are 5 example of electromagnetic devices? ›
- Generators, motors, and transformers.
- Electric buzzers and bells.
- Headphones and loudspeakers.
- Relays and valves.
- Data storage devices like VCRs, tape recorders, hard discs, etc.
- Induction cooker.
- Magnetic locks.
- MRI machines.
From long to short wavelength, the EM spectrum includes radio waves, microwaves, infrared, visible light, ultraviolet, x-rays and gamma rays. Energy is propagated through space in the form of electromagnetic (EM) waves, which are composed of oscillating electric and magnetic fields.What are electromagnetic waves and list 3 examples? ›
Electromagnetic waves can be split into a range of frequencies. This is known as the electromagnetic spectrum. Examples of EM waves are radio waves, microwaves, infrared waves, X-rays, gamma rays, etc.How many electromagnetic waves are there? ›
Electromagnetic Waves Definition
There are seven types of electromagnetic waves: radio waves, microwaves, infrared light, visible light, ultraviolet light, X-rays, and gamma rays.
Types of EMR include radio waves, microwaves, infrared, (visible) light, ultraviolet, X-rays, and gamma rays, all of which are part of the electromagnetic spectrum.What is electromagnetic waves and examples? ›
Electromagnetic waves are a form of radiation that travel though the universe. They are formed when an electric field (Fig. 1 red arrows) couples with a magnetic field (Fig. 1 blue arrows).Which of the 7 types of electromagnetic waves is the most important? ›
Electromagnetic waves are classified according to their frequency. The different types of waves have different uses and functions in our everyday lives. The most important of these is visible light, which enables us to see.
The other types of EM radiation that make up the electromagnetic spectrum are microwaves, infrared light, ultraviolet light, X-rays and gamma-rays. You know more about the electromagnetic spectrum than you may think.What are the 4 main properties of electromagnetic waves? ›
- Electromagnetic waves are propagated by oscillating electric fields and magnetic field oscillation at right angles to each other.
- These waves travel with speed 3×108ms−1 in vacuum.
- They are not deflected by electric or magnetic field.
- They can show interference or diffraction.
- They are transverse waves.
Hall transducer is not an electromagnetic device.
Answer and Explanation: Microwaves are an example of how electromagnetic energy is used in everyday life. The energy to warm food in a microwave oven comes from electromagnetic waves of the microwave portion of the electromagnetic spectrum.Which type of electromagnetic wave has the most energy? ›
Gamma rays have the highest energies and shortest wavelengths on the electromagnetic spectrum.Which of the following is an example of an electromagnetic wave responses? ›
X-ray is an example of electromagnetic waves.Which of the following electromagnetic waves is used? ›
Electromagnetic waves with wavelengths shorter than about 100-trillionths of a meter are called gamma rays. They are used in a technique called radiation therapy to kill diseased cells in the human body.Which is true about electromagnetic waves? ›
They are transverse waves and do not require a medium to travel. They do not follow laws of reflection and refraction.What type of wave is an electromagnetic wave quizlet? ›
An electromagnetic wave is a transverse wave. The energy carried by an electromagnetic wave is called radiant energy.What is an electromagnetic short answer? ›
An electromagnet is a magnet that runs on electricity. Unlike a permanent magnet, the strength of an electromagnet can easily be changed by changing the amount of electric current that flows through it. The poles of an electromagnet can even be reversed by reversing the flow of electricity.
ELECTROMAGNETIC SPECTRUM. Radios, televisions, mobile phones, and radar use signals made up of electromagnetic waves. These are waves that carry energy as electricity and magnetism at the speed of light. Light we can see is also an electromagnetic wave, but other types of electromagnetic wave are invisible.Is electromagnetic energy a energy? ›
The terms light, electromagnetic waves, and radiation all refer to the same physical phenomenon: electromagnetic energy. This energy can be described by frequency, wavelength, or energy.Is electromagnetic energy electric energy? ›
Electrical energy is electromagnetism, which is composed of an electromagnetic field. To the contrary, the particles of electricity flowing within a wire has little resemblance to an electromagnetic field.What are 3 properties of electromagnetic waves? ›
- Electromagnetic waves are transverse in nature.
- Electromagnetic waves consist of oscillating magnetic and electric fields that, are perpendicular to each other.
- Electromagnetic waves travel through vacuum with same speed, 3 × 10 8 m / s .
The electromagnetic waves emitted by the sun are of a broad spectrum ranging from X-rays with a wavelength of 2 nanometers to radio waves with a wavelength of 10 meters. The most intense of these to reach the earth's surface is visible light, with a wavelength around 500 nanometers.What are 3 types of electromagnetic devices? ›
Mobile phones, power lines and computer screens are examples of equipment that generates electromagnetic fields.What are the 5 types of electromagnetic waves? ›
The other types of EM radiation that make up the electromagnetic spectrum are microwaves, infrared light, ultraviolet light, X-rays and gamma-rays.What are 5 examples of EM waves we encounter in everyday life? ›
- Radio waves. Radio waves are used for communication such as television and radio. ...
- Microwaves. Microwaves are used for cooking food and for satellite communications. ...
- Infrared. ...
- Visible light. ...
- Ultraviolet radiation.
- Power lines and electrical products. ...
- Wi-Fi. ...
- 5G technology, cell phones, cell phone towers and antennas. ...
- Hand-held lasers and laser pointers. ...
- Tanning beds and lamps. ...
- Smart meters. ...
- Compact fluorescent lamps. ...
- Microwave ovens.
The entire electromagnetic spectrum, from the lowest to the highest frequency (longest to shortest wavelength), includes all radio waves (e.g., commercial radio and television, microwaves, radar), infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays.
Electromagnetic waves have both magnetic as well as electric fields. They are characterised in view of their frequency. Other examples of electromagnetic waves are Radio waves, Microwaves, Infrared radiation, Visible light - all colours of the spectrum that we can see, Ultraviolet light, and X-rays.Which 3 types of EM waves can be harmful to life? ›
Gamma rays, x-rays, and some ultraviolet waves are "ionizing," meaning these waves have such a high energy that they can knock electrons out of atoms. Exposure to these high-energy waves can alter atoms and molecules and cause damage to cells in organic matter.What are 6 uses of electromagnetic waves? ›
Electromagnetic waves have a vast range of practical everyday applications that includes such diverse uses as communication by cell phone and radio broadcasting, WiFi, cooking, vision, medical imaging, and treating cancer.What are the parts of a electromagnetic wave? ›
Electromagnetic waves have two components: an oscillating electric field and a perpendicular, comoving magnetic field which oscillates at the same frequency, but with a phase shifted by 90°. They describe the movement of a packet of energy between two points.What are examples and non examples of electromagnetic waves? ›
Some example of electromagnetic waves is light, heat, gamma rays etc. Some waves are not electromagnetic in nature, like, Ultrasonic wave, Sound wave, Alpha rays, beta rays, Cathode rays and Canal rays.What are five examples of electromagnetic radiation quizlet? ›
List 5 examples of electromagnetic radiation. Visible light, X rays, ultraviolet, infrared light, microwaves, and radio waves.What are the examples of electromagnetic spectrum quizlet? ›
- Radio Waves. Radio waves have lower frequencies and longer wavelengths than microwaves. ...
- Micro Waves. Microwave radiation has lower frequencies and longer wavelengths than visible light. ...
- Infa Red. It is absorbed by the skin and we feel it as heat. ...
- Visible Light. ...
- Ultra Violet. ...
- X-Rays. ...
- Gamma Rays.