A 100 kg roller coaster car is located at the top of a hill where the height is 20 m. What is the velocity when it reaches the bottom of the hill? 5.5 m/s 11.2 m/s 16.7 m/s 19.8 m/s
Answer:
19.8 m/s
Explanation:
Assuming the car starts from rest, initially when it is at the top of the hill all the mechanical energy of the car is just potential energy, given by:
[tex]U=mgh[/tex]
where
m = 100 kg is the mass
g = 9.8 m/s^2 is the gravitational acceleration
h = 20 m is the height
Substituting,
[tex]U=(100 kg)(9.8 m/s^2)(20 m)=19,600 J[/tex]
At the bottom of the hill, all this energy has been converted into kinetic energy (because energy cannot be created or destroyed, but only transformed). Therefore, the kinetic energy of the car is:
[tex]K=\frac{1}{2}mv^2=19,600 J[/tex]
where
m = 100 kg is the mass of the car
v is the speed of the car at the bottom of the hill
Re-arranging this equation, we can find the value of v:
[tex]v=\sqrt{\frac{2K}{m}}=\sqrt{\frac{2(19,600 J)}{100 kg}}=19.8 m/s[/tex]
anthony is learning about electric circuits. he has started building a circuit shown below. which of the following items should he add to his circuit to test whether it has a current flowing through
which is an angiosperm. A.fern B.moss C.pine D.tulip
What important temperatures does the Celsius scale use for a basis?
A) the boiling and freezing point of water
B) temperatures on the sun and the moon
C) the rang of human body temperatures
D) high and low air temperatures
The image formed by a convex spherical mirror will always be
A. upright and larger than the object.
B. upright and smaller than the object.
C. inverted and larger than the object.
D. inverted and smaller than the object.
I don’t believe it’s C or D. If you believe so can you please explain? Pennfoster Test
Plane mirrors and convex mirrors only produce virtual images. Only a concave mirror is capable of producing a real image and this only occurs if the object is located a distance greater than a focal length from the mirror's surface. 10. The image of an object is found to be upright and reduced in size.
So B
Which diagram BEST represents the light waves of a bright red brake light on the left side to a dim violet night light on the right side?
A)
B)
C)
D)
Diagram-A does.
The left side has high amplitude (bright) and long wavelength (red).
The right side has low amplitude (dim) and short wavelength (violet).
Diagram-A does. The left side has high amplitude (bright) and long wavelength (red). and The right side has low amplitude (dim) and short wavelength (violet).
What are light waves?Waves of light emerge from a source. Both an electric and a magnetic component make up each wave. Because of this, light is also known as electromagnetic radiation.
Our brains interpret light waves by assigning different colors to the different wavelengths, but much of the light in the Universe travels with wavelengths too short or too long for the human eye to detect.
The longest wavelengths are the infrared, microwave, and radio portions of the spectrum. The shortest wavelengths of the spectrum are the ultraviolet, x-ray, and gamma radiation.
Therefore, Diagram-A does. The left side has high amplitude (bright) and long wavelength (red). and The right side has low amplitude (dim) and short wavelength (violet).
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Which of these is true of an inelastic collision between two objects in a closed system but not of an elastic collision? Total momentum is conserved. Total kinetic energy is conserved. Kinetic energy is less after the collision. Total momentum is not conserved.
In an inelastic collision within a closed system, the kinetic energy is less after the collision whereas the total momentum remains conserved.
Explanation:The true statement about an inelastic collision between two objects in a closed system, but not of an elastic collision, is that kinetic energy is less after the collision. In an inelastic collision, kinetic energy is not conserved because some of the kinetic energy may be converted into other forms such as thermal energy or potential energy. However, total momentum is conserved in both elastic and inelastic collisions, as long as the net external force on the system is zero.
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Which one of the following types of electromagnetic radiation causes certain substances to fluoresce?
A. Cosmic rays
B. X rays
C. Infrared waves
D. Ultraviolet rays
Final answer:
Ultraviolet (UV) rays are the type of electromagnetic radiation that causes substances to fluoresce by exciting their electrons.
Explanation:
The type of electromagnetic radiation that causes certain substances to fluoresce is ultraviolet (UV) rays. Fluorescence occurs when a substance absorbs this radiation and then emits light. Ultraviolet rays have higher energy (as opposed to infrared waves, for example) and can excite electrons in a substance to a higher energy level. When these electrons return to their original energy state, they release energy in the form of visible light, causing the substance to appear to glow or fluoresce.
When positively charged particles were radiated onto a gold atom, a few of the particles bounced back. Which of the following caused this?
Positively charged protons in the nucleus of the gold atom
Positively charged electrons in the nucleus of the gold atom
Negatively charged protons around the nucleus of the gold atom
Negatively charged electrons around the nucleus of the gold atom
Positively charged protons in the nucleus of the gold atom .... rutherford scattering ???
Answer:
Positively charged protons in the nucleus of the gold atom
Explanation:
Earth is approximately 4.5 billion years old. Is it likely that any of the rocks that were on Earth's surface when it first formed are still in existence? A. No, most of Earth's magma did not solidify until 1 billion years ago. B. Yes, Earth's surface has changed very little since Earth was first formed. C. No, rock material is constantly recycled on Earth's surface through the rock cycle. D. Yes, rocks are very hard and should be able to survive for 4.5 billion years.
A. is the anwer
No, rock material is constantly recycled on Earth's surface through the rock cycle.
how did napoleon raise soldiers for hi army
When is the net force on an object equal to zero?
A rigid tank of air is cooled (temperature decreased). The volume has to remain constant because it is a rigid tank. The air pressure in the rigid tank
A. Increases B. Decreases C. Stays the same
The air pressure in the rigid tank Decreases.
Explanation:
A rigid tank is said to be a region where volume is always considered as a constant. During the process of cooling the rigid tank where the temperature is said to be decreased, the effect of air pressure in the tank also decreases.
Because, PV = RT, where P is the pressure, T is temperature, R is constant, V is the volume. Hence pressure is directly proportional to temperature.
Study the interaction of the light rays with the mediums. Classify the medium in each image as being transparent or opaque.
Light can be reflected, transmitted, or absorbed. You have read that EM waves can interact with a material medium in the same ways that mechanical waves do. Three forms of interaction play an especially important role in how people see light. One form is reflection.
What is reflection?
"Reflection of light (and other forms of electromagnetic radiation) occurs when the waves encounter a surface or other boundary that does not absorb the energy of the radiation and bounces the waves away from the surface."
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a physical anthropologist studies the of human remains
Answer:
True
Explanation:
They study human forms.
HELP RIGHT NOW THE RIGHT ANSWER GETS BRAINLEST!!!
Match the term to its description.
Match Term Definition
Prominences A) Brief eruptions of intense high-energy radiation from the sun's surface
Solar flares B) The rise of hotter, less dense fluid and the sinking of cooler, denser fluid
Sunspots C) Streams of glowing gas that shoot out from the sun in an arch
Convection D) Dark spots appearing from time to time on the sun's surface
The sun stands at the center of the solar system and all other celestial bodies have their places around the sun.
What is the sun?The sun stands at the center of the solar system and all other celestial bodies have their places around the sun.
The following are the accurate matches of the descriptions as shown in the question.
Solar Flares: Streams of glowing gas that shoot out from the sun in an archProminences: Brief eruptions of intense high-energy radiation from the sun's surfaceSun Spots: Dark spots appearing from time to time on the sun's surfaceConvection: The rise of hotter, less dense fluid and the sinking of cooler, denser fluidLearn more about the sun:https://brainly.com/question/17376727
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What is the relationship between wind and ocean waves
Explanation:
Wind waves are the surface waves that occurs on the free surface of water. They result from wind blowing over an area of the surface of water.
The energy is transferred from the wind in waves across the ocean.
Wave height of the ocean is affected by wind speed. If the speed of the wind is slow then only small waves will occur.
When wind moves at high speed then it transfers more energy to the water. It will result in stronger waves.
Answer:I think the answer is Wind moving at higher speeds will transfer more energy to the water, resulting in stronger waves.
Explanation: Because wind transfers energy to the ocean, if there are faster winds, more winds transfers more energy to the water.
What are sun spots??????????
The surface of the Sun has dark areas called sunspots. They are cooler than the hot, yellow areas. Sunspots were discovered by the astronomer Galileo Galilei. Some sunspots can last weeks or even months.
A toy car is placed at 0 On a number line. It moves 9 cm to the left , then 4cm to right, and then 6cm to the left . The total distance the toy car traveled is
Two negative charges that are both -3.0 C push each other apart with a force of 19.2 N. How far apart are the two charges ?
The distance between the two charges is approximately 64828.5 m (or about 64.8 km).
To find the distance between two charges that exert a given force on each other, we use Coulomb's Law, which states:
[tex]\[ F = k_e \frac{|q_1 q_2|}{r^2} \][/tex]
Where:
F is the force between the charges,
[tex]k_e[/tex] is Coulomb's constant [tex](\(8.99 \times 10^9 \, \text{N} \cdot \text{m}^2/\text{C}^2\))[/tex],
[tex]q_1[/tex] and [tex]q_2[/tex] are the magnitudes of the charges,
r is the distance between the charges.
Given data:
[tex]\( q_1 = q_2 = -3.0 \, \text{C} \)[/tex]
F = 19.2 N
We need to find (r).
1. Insert the known values into Coulomb's Law:
[tex]\[ 19.2 = \left(8.99 \times 10^9 \right) \frac{|-3.0 \times -3.0|}{r^2} \][/tex]
2. Simplify the charges:
[tex]\[ 19.2 = \left(8.99 \times 10^9 \right) \frac{9.0}{r^2} \][/tex]
[tex]\[ 19.2 = 8.99 \times 10^9 \times \frac{9.0}{r^2} \][/tex]
[tex]\[ 19.2 = 80.91 \times 10^9 \times \frac{1}{r^2} \][/tex]
[tex]\[ r^2 = \frac{80.91 \times 10^9}{19.2} \][/tex]
[tex]\[ r^2 = 4.21 \times 10^9 \][/tex]
[tex]\[ r = \sqrt{4.21 \times 10^9} \][/tex]
r = 64828.5 m or 64.8 km
Five metal samples, with equal masses, are heated to 200oC. Each solid is dropped into a beaker containing 200 ml 15oC water. Which metal will cool the fastest? A) aluminum B) copper Eliminate C) gold D) platinum
Aluminum, due to its higher thermal conductivity, will cool the fastest when dropped into 15⁰C water.
Explanation:In this scenario, the metal samples that cool fastest will be the one with the highest thermal conductivity. Thermal conductivity is a property that determines how quickly heat is transferred within a material. Of the materials provided, Aluminum has the highest thermal conductivity. Therefore, Aluminum will lose its heat quickest when dropped into the 15⁰C water, cooling fastest.
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true or false a 6 volt battery has a greater electric potential difference than a 1.5 volt battery
A tiger started running when it saw a deer running at uniform velocity 2m/s at 15m far from it ..if the tiger ran at acceleration 2m/s^2..when and where did the tiger catch the deer?
Which term is defined as the change in the direction of light when it goes from one medium into a different medium? Question 2 options: Diffraction Absorption Reflection Refraction
In a heat engine, if 700 J of heat enters the system, and the piston does 400 J of work, what is the final internal (thermal) energy of the system if the initial energy is 1,200 J?
1,100 J
1,500 J
900 J
300 J
The answer is 1500 J
consider the variables in the equation for the first law of thermodynamicis .
which of these would most likely change if the Earth's orbit around the sun becomes more rounded?
a) tilt of Earth
b) global climate
c) length of days
d) length
Answer:
b) global climate
Explanation:
Earth's orbit around the sun is elliptical. This means, in some part of the year, the earth is closer to sun than others. This effects the global climate. A difference of about 5 degree in temperature occurs when the earth is closest and farthest from the sun. If the orbit is more rounded, the global climate would most likely change. It become more uniform.
Chemical properties of a base include...
Increases the concentration of hydroxide ions when added to water, feels slippery, and forms salt when added to an acid.
Increases the concentration of hydrogen ions when added to water, reacts with metal to form hydrogen gas, and forms salt when added to an acid.
Increases the concentration of hydroxide ions when added to water, reacts with many oils and fats, and forms salt when added to an acid.
Increases the concentration of hydroxide ions when added to water, reacts with many oils and fats, and tastes bitter.
Bases are substances that increase the concentration of hydroxide ions in water. They dissolve and dissociate to release hydroxide ions, and have properties such as feeling slippery and forming salts when added to acids.
Explanation:Bases are substances that increase the concentration of hydroxide ions (OH-) in water. They do not react chemically with water but dissolve and dissociate, releasing hydroxide ions into the solution. Bases can be identified by their properties, such as feeling slippery, forming salts when added to acids, and increasing the concentration of hydroxide ions in water.
For example, when sodium hydroxide (NaOH) dissociates in water, it releases Na+ and OH- ions:
NaOH(s) → Na+ (aq) + OH- (aq)This dissociation process is complete for ionic hydroxides like NaOH, making them strong bases.
Which of the following correctly describes the state of matter of one of the samples? A is a solid because its volume is equal to the volume of the containers. B is a gas because its volume is less than the volume of the containers. B is a solid because it contracts as the containers change. A is a gas because it contracts as the containers change.
Sample A could potentially be a solid since it has the same volume as the container, and solids have a definite volume. However, the volume of a gas can also equal the volume of its container because gases fill the space available to them, so B is not necessarily a gas just because its volume is less than that of its container. The behavior of the samples when the container changes are not specific properties of solids or gases.
Explanation:The question is asking about how to identify the states of matter of different samples based on their properties. In this case, the statements 'A is a solid because its volume is equal to the volume of the containers' and 'B is a gas because its volume is less than the volume of the containers' might be confused. Here is why: solids, liquids, and gases are different states of matter that exist. Solids have definite shape and volume, regardless of their containers. This means sample A could indeed be a solid if its volume equals the volume of the container. However, the volume of a gas is not necessarily less than the volume of its container.
Gases actually take the shape and volume of their containers, so a gas could fill the entire volume of its container if allowed. Neither of the statements 'B is a solid because it contracts as the containers change' and 'A is a gas because it contracts as the containers change' are necessarily true, as contracting is not a specific property of either solids or gases. Without more specific information about these samples, it's difficult to definitively identify their state of matter based on the provided descriptions.
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Which of the following sequences correctly displays the energy transformation from the inside of a battery to the igniter inside a car's engine? A. Heat Energy Electrical Energy Chemical Energy B. Electrical Energy Chemical Energy Heat Energy C. Chemical Energy Electrical Energy Heat Energy D. Chemical Energy Mechanical Energy Heat Energy
C: Chemical Energy - Electrical Energy - Heat Energy
when the air in a submarine's huge air tanks is decompressed and it displaces the water in the ballast tanks with air, what does the submarine do?
A. It sinks B. It floats C. It provides air to the passengers
Decompressing the air in a submarine's air tanks displaces the water in the ballast tanks with air, reducing the submarine's density and making it float. Therefore, the correct answer is B. It floats.
The student asked, "When the air in a submarine's huge air tanks is decompressed and it displaces the water in the ballast tanks with air, what does the submarine do? A. It sinks B. It floats C. It provides air to the passengers".
When the air in a submarine's huge air tanks is decompressed, it displaces the water in the ballast tanks with air. This action reduces the overall density of the submarine, making it less dense than the surrounding water, and as a result, the submarine floats.
Therefore, the correct answer is: B. It floats.