which of the folowing is true at the point where you reach the top of your jump on ur trampoline?
a)The mechanical enerygy is zero
b)The potential energy is at a maximum
c)The kinetic enrgy and potential energy
d)The potential energy is zero
Answer:
b) The potential energy is at a maximum.
Explanation:
It happens because the equation for the potencial energy is a function of the height of the body (Epotential=mgh) and, when you reach the top of your jump, you obviously reach your maximum height.
Final answer:
The potential energy is at its maximum at the top of the jump on a trampoline, with kinetic energy being zero and mechanical energy equating to the potential energy. The correct option is b) The potential energy is at a maximum
Explanation:
The correct answer to the question is that at the top of your jump on a trampoline, the potential energy is at its maximum (b). This is because when you are at the peak of your jump, you have the maximum height above the ground, where the gravitational potential energy is highest when assuming gravitational force is the only significant force in play (air resistance being negligible).
Kinetic energy is zero at this point because you are momentarily stationary at the top of the jump before descending back down. The mechanical energy of the system is not zero, however, as it is the sum of kinetic and potential energy and therefore will equal the potential energy at the top of the jump.
Based on the concept of the wave-like nature of light, Huygens' theory of light __________ postulates that the more light was "bent" by a substance the slower it would move while traversing across that substance.
The correct answer is "refraction", I just answered it on usatestprep.
PART 2!! PLEASE HELP!!
1) which of the following wires would have the least resistance? (*=Degree)
A-An aluminum wire 20cm in diameter at 40* C
B-An aluminum wire 20cm in diameter at 60* C
C-An aluminum wire 40Cm in diameter at 40*C
D-An aluminum wire 40Cm in diameter at 60*C
---------------------------------------
2)A flashlight bulb with a potential difference of 4.5 V across it has a resistance of 8.0 ohms. How much current is in the bulb filament?
A-36 A
B-9.4 A
C-1.8 A
D-0.56 A
---------------------------------------
Answer:
Number 1 is C
Number 2 is D
.56 A
A 3.00 kg cart on a frictionless track is pulled by a string so that it accelerates at 2.00 m/s/s. what is the tension in the string
Answer: The tension in the string is 6 N
Explanation:
Tension is defined as the pulling force that is applied on a string, chain etc.. Force is also defined as the mass multiplied by the acceleration of the object.
Mathematically,
[tex]F=ma[/tex]
where,
F = tension or force exerted in the string
m = mass of the cart pulling the string = 3.00 kg
a = acceleration of the string = [tex]2.00m/s^2[/tex]
Putting values in above equation, we get:
[tex]F=3.00kg\times 2.00m/s^2\\\\F=6N[/tex]
Hence, the tension in the string is 6 N
What occurs with the doppler effect are changes in _____. view available hint(s) what occurs with the doppler effect are changes in _______. frequency due to motion the speed of sound due to motion both of these answers are correct. neither of these answers is correct?
Final answer:
The Doppler effect involves changes in frequency due to the relative motion between a wave source and its observer, not changes in the speed of sound.
Explanation:
What occurs with the Doppler effect are changes in frequency due to motion. The Doppler effect is a phenomenon observed with waves, where there is an alteration in the observed frequency of a sound or light due to the relative motion between the source and the observer. It's important to note that the Doppler effect does not involve a change in the speed of sound due to motion, but strictly involves changes in frequency.
The practical applications of the Doppler effect are vast, ranging from medical diagnostics using Doppler-shifted ultrasound to determine blood flow, to astronomy where it helps in the study of the motion of stars and galaxies. Fundamentally, the effect explains how the motion affects the perceived pitch of a sound for an observer; for example, the high pitch of an approaching ambulance siren that lowers as it moves away.
a student tests the second law of motion by accelerating a block of ice at a rate of 3.5 m/s squared. if the ice has a mass of 12.5 kg , what force must the student apply to the ice
To accelerate the block of ice at a rate of 3.5 m/s², the student must apply a force of 43.75 Newtons.
Explanation:To calculate the force required to accelerate the block of ice, we can use Newton's second law of motion, which states that F = ma, where F is the force, m is the mass, and a is the acceleration.
In this case, the mass of the block of ice is 12.5 kg and the acceleration is 3.5 m/s². Plugging these values into the equation, we get:
F = (12.5 kg) * (3.5 m/s²) = 43.75 N
Therefore, the student must apply a force of 43.75 Newtons to the ice in order to accelerate it at a rate of 3.5 m/s².
Learn more about Newton's second law of motion here:https://brainly.com/question/13447525
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A racing car is moving around the circular track of radius 300 meters shown above. at the instant when the car's velocity is directed due east, its acceleration is directed due south and has a magnitude of 3 meters per second squared. when viewed from above, the car is moving clockwise at 30 m/s clockwise at 10 m/s counterclockwise at 30 m/s counterclockwise at 10 m/s
Answer:
the car is moving clockwise at 30 m/s
Explanation:
For an object moving in circular motion:
- The velocity is always tangential to the circle
- The acceleration (centripetal acceleration) is towards the centre of the circle, so perpendicular to the velocity)
In this case, the velocity is directed due east, while the acceleration is directed due south: so the car is "curved towards south while moving", this means that the car is travelling clockwise.
Moreover, the centripetal acceleration is given by:
[tex]a=\frac{v^2}{r}[/tex]
where
a = 3 m/s^2 is the acceleration
v is the speed
r = 300 m is the radius of the track
Solving for v,
[tex]v=\sqrt{ar}=\sqrt{(3 m/s^2)(300 m)}=30 m/s[/tex]
So the answer is
the car is moving clockwise at 30 m/s
In a clockwise circular motion, when a car's velocity is east, its inward or centripetal acceleration is due south. Circular motion rules dictate this because acceleration is towards the centre. However, the car's speed can't be deduced from this data.
Explanation:The student's question pertains to the concept of circular motion dynamics, which is a topic in physics. The key is understanding that a car moving in circular motion always has an acceleration directed towards the center of the path, also known as centripetal acceleration. The direction of velocity, which is tangential to the path, continually changes due to this inward acceleration.
If we consider a car moving clockwise around a circular track when viewed from above - the east would be on its right and south would be below. In this scenario, when the car's velocity is directed due east, the centripetal acceleration (due to the car's need to change direction to stay on the circular path) will be facing due south.
Regarding the speed of the car, it can be moving either clockwise or counterclockwise at either 10 m/s or 30 m/s. However, this information cannot be determined from the acceleration data as there is no measure of the car's tangential acceleration, which is the acceleration that affects the car's speed.
Learn more about circular motion here:https://brainly.com/question/2285236
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Which characteristic accounts for the fact that red lights are used in dark rooms and DO NOT expose negatives during developing? A) small size B) low energy C) high energy D) high velocity
Answer:
A) Low Energy
Explanation:
Red colour light is light with larger wavelength due to which it can travel large distance. Due to this property of red colour light we use this colour to show different signals so that they are visible from distance
Here we also know by the formula of energy
[tex]E = \frac{hc}{\lambda}[/tex]
here we can see that the wavelength of light and energy of light is inversely depends on each other
So here we can say that red colour light is of larger wavelength and smaller energy due to which it can travel larger distance
so correct answer is
A) Low Energy
a small dog is trained to jump straight up a distance of 1.2m. How much kinetic energy does the 7.2kg dog need to jump this high? ( the acceleration due to gravity is 9.8m/s2)
A bat hits a ball; which has the greater acceleration, the bat or the ball?
Answer: The ball.
Explanation: Right before the impact, the bat will have a bigger acceleration than the ball (assuming that the ball is trowed softly), and after the impact, there will be some energy of the bat transferred to the ball. As the ball has a lot less mass than the bat, it is "easily" accelerated:
Remember that the second Newton's law says that:
F = m*a
So, after the impact, the ball has a greater acceleration than the bat (Also, if the bat had more acceleration than the ball, it will "push" the ball, but you can see that the ball "escapes" to the bat after the initial impact).
Ryan is experimenting with core materials for an electromagnet. He slides different core materials through a coil of current-carrying wire. Sort the core materials based on whether they will or won’t increase the strength of Ryan’s electromagnet.
what is the amount of a certain isotope that occurs in a natural sample of an element
Answer:Relative abundance.
Explanation:
Relative abundance is the percentage of a particular isotope that occur in nature.
HELP WILL MEDAL !!!!!!!!!!!!!!!!!!!
Suppose you are an astronomer, and a child asks you to explain how long it takes light to travel through space. In your own words, answer the child's question. Be sure to mention the speed that light travels in space, and provide a general idea of how long it takes the light from distant stars to reach Earth.
Which of the following terms best describes air
A. Element
B. Compound
C. Mixture
D. None of the above
Final answer:
Air is best described as a homogeneous mixture. This classification indicates that air is composed of various gases such as nitrogen, oxygen, and other trace gases, mixed uniformly. It is neither an element nor a compound.
Explanation:
Air Composition Classification
When assessing the nature of air, the correct classification from the given options would be 'C. Mixture'. To be more specific, air is a homogeneous mixture made up of multiple substances, including primarily nitrogen and oxygen, as well as argon, carbon dioxide, and other trace gases, which are evenly distributed throughout the mixture. Air is not an element, because it consists of more than one kind of atom; it is not a compound, as its composition can vary and is not a single chemical substance with a fixed ratio of elements. Instead, air exemplifies a solution, which is a type of homogeneous mixture.
Examples of Elements, Compounds, and Mixtures
Salt is a compound (NaCl).
Pure water is a compound (H2O).
Soil is a heterogeneous mixture, composed of various organic and inorganic materials.
Salt water is a homogeneous mixture or a solution, where the salt is dissolved evenly in the water.
Pure air is a homogeneous mixture of gases.
Carbon dioxide (CO2) is a compound.
Gold is an element (Au).
Bronze is a metal alloy, a type of homogeneous mixture of copper and other metals like tin or aluminum.
Earth is the third planet from the Sun. This placement most affects Earth's unique ____ and ____ conditions.
1. a. temperature
b. differentiation
c. gravity
d. moon
2. a. lithospheric
b. mantle
c. core
d. atmospheric
What is the power of a hair dryer if it uses 72,000 joules energy in 60.0 seconds
To remove a tight fitting lid from a jar, Megan runs the lid under hot water. What happenes to the jar lid when its temperature increases?
(a) The temperature increases, the lid expands
(b) The potential energy decreases, and the lid expands
(c) The potential energy increases, and the lid contracts
(d) The temperature decreases, and the lid contracts
Answer:
(a) The temperature increases, the lid expands
Explanation:
Running the lid under hot water will result in the transfer of heat from the water to the lid of the jar.
The heating up of the lid increases its temperature and the average kinetic energy of the molecules of the lid. Hence, the jar lid to expand and becomes easier to open.
The correct option is a.
A hammer taps on the end of a 4.9 m long metal bar at room temperature. a microphone at the other end of the bar picks up two pulses of sound, one that travels through the metal and one that travels through the air. the pulses are separated in time by 10.4 ms. what is the speed of sound in this metal
which option is an example of a physical property?
A. boiling point
B. pH
C. toxicity
D. rusting ability
The correct answer would be A. boiling point. And the reason to that is because pH, toxicity, and rusting ability are all examples of chemical properties.
Answer:
boiling point
Explanation:
Physical property doesn't change the composition of the substance. Boiling point only change the matter, not the composition.
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Learning Properties of Matter Quiz Unit 2 Lesson 11 Grade 8
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Ashkon throws a basketball across the court to his teammate. The ball has 57 J of potential energy and 61 J of kinetic energy. What is the total mechanical energy of the basketball?
The total mechanical energy of the ball is the sum of its potential energy U and its kinetic energy K, therefore:
E=U+K=57 J+61 J=118 J
so, the total mechanical energy of the basketball is 118 J.
How do odd-shaped ceilings, decorative panels, draperies, and glass windows affect echo and noise?
Odd-shaped ceilings, decorative panels, draperies, and glass windows reduce echoes and noises.
What is an echo?An echo is a sound that is caused because of the reflection of sound.
How can echoes be avoided?In order to avoid echoes, we must avoid creating surfaces where the sound waves can be focused.
Now, as we know the reason why echoes are formed and how can they be avoided, therefore,
Making odd-shaped ceilings and decorative panels reduces the surfaces where the sound waves can be focused. While putting draperies and glass windows will absorb the sounds, As glass absorbs the sound waves and convert the energy into vibration energy.
Hence, odd-shaped ceilings, decorative panels, draperies, and glass windows reduce echoes and noises.
Learn more about Echo:
https://brainly.com/question/9028662
NEED SCIENCE HELP:
Question 1:
which subatomic particle has a negative charge?
all of them
neutron
electron
proton
Question 2:
if an atom has 2 protons, 3 neutrons, and 3 electrons, what is the electrical charge of the atom?
positive
negative
neutral
varies
Question 3:
A neutral atom that gains electrons will have what kind of charge?
positive
negative
neutral
varies
Question 4:
which of the following describes the principle of the conservation of charge?
a charge is created
a charge cannot be transferred
charge cannot be created or destroyed, just transferred
charge can be destroyed
Question 5:
what law states that when there is an interaction between charged objects there is a non-contact force which acts over some distance of seperation?
faraday's law
ohm's law
coulomb's law
interaction law
Question 6:
which of the following describes an insulator?
does not allow electrons to move through it
allows electrons to move through it
is always a solid
is always a gas
Question 7:
what are most conductors made of?
wood
paper
plastic
metal
Question 8:
which of the following describes why lightening rods are put on top of houses?
insulate the house
conduct the lightening away from the house
reduce amount of static discharge
reduce the loudness of thunder
Question 9:
your computer is powered by which of the following?
electrical current
moving protons
overflow of electrons
static electricity
Question 10:
wire is used to attach a battery to a penny and is then used to light a small light bulb. the light bulb is lit due to which of the following?
static electricity
electric current
electron overflow
moving protons
Question 1:
which subatomic particle has a negative charge?
Answer:
Electron
Explanation:
There are three subatomic particles
electron, neutron and proton
out of all electron is negatively charged, proton is positively charged while neutron is a neutral particle
Question 2:
if an atom has 2 protons, 3 neutrons, and 3 electrons, what is the electrical charge of the atom?
Answer:
Negative
Explanation:
As we know that
[tex]Q = (N_p - N_e) e[/tex]
[tex]N_p = 2[/tex]
[tex]N_e = 3[/tex]
[tex]Q = (2- 3)e = -e[/tex]
so it is negatively charged
Question 3:
A neutral atom that gains electrons will have what kind of charge?
Answer:
Negative
Explanation:
Since electron is a negatively charged particle so on gaining an electron it will get negative charge
Question 4:
which of the following describes the principle of the conservation of charge?
Answer:
Charge cannot be created or destroyed, just transferred
Explanation:
charge can transfer from one atom to other atom but we can not create a charge or we can not destroy a charge
Question 5:
what law states that when there is an interaction between charged objects there is a non-contact force which acts over some distance of seperation?
Answer:
Coulomb's law
Explanation:
Coulombs law gives the force of attraction or repulsion between two charges which is given as
[tex]F = \frac{kq_1q_2}{r^2}[/tex]
Question 6:
which of the following describes an insulator?
Answer:
Does not allow electrons to move through it
Explanation:
in insulators all the charges are bounded and not free to move
Question 7:
what are most conductors made of?
Answer:
Metal
Explanation:
All conductors are source of free electrons in which they can move freely
Question 8:
which of the following describes why lightening rods are put on top of houses?
Answer:
conduct the lightening away from the house
Explanation:
lightening rod gives the path to excess charge to flow towards ground
Question 9:
your computer is powered by which of the following?
Answer:
Electrical current
Explanation:
All electrical device is powered by current source
Question 10:
wire is used to attach a battery to a penny and is then used to light a small light bulb. the light bulb is lit due to which of the following?
Answer:
electric current
Explanation:
electric current gives energy to glow the bulb
From just the atomic number, what else is known?
a) the chemical number
b) the number of neutrons
c) the atomic mass
d) the number of protons
Answer:the number of protons
The electric field between two parallel plates has a magnitude of 875 n/
c. the positive plate is 0.002 m away from the negative plate.
Which are examples of resonance? Check all that apply.
the volume on a stereo being turned up
a note being played on a saxophone
an opera singer breaking
a glass with her voice a person pushing
a swing at the rate it naturally oscillates back and forth
an echo
Answer: The correct options are:
A note being played on a saxophone
An opera singer breaking glass with her voice a person pushing
A swing at the rate it naturally oscillates back and forth
Explanation:
Resonance is a phenomenon which occurs when the applied frequency on the object is equal to its natural frequency.
When resonance occurs the amplitude of the vibrating object becomes large.
In the given options, the examples of the resonance are as follows:
"an opera singer breaking a glass with her voice a person pushing": Here, the resonance will occur due to which the glass will break. The applied frequency of the voice of a person on the glass matches with the natural frequency of the glass.
"a note being played on a saxophone": Here, the resonance will occur. The sound energy is produced by saxophone. The air is blown through mouthpiece in it. It causes reed to vibrate rapidly against mouthpiece. Then, air moves through it. Then, the sound is amplified until it escapes through open tone holes.
"swing at the rate it naturally oscillates back and forth": when the applied frequency on the swing matches with the natural frequency of swing. The amplitude of the swing will increase. Here, the resonance will occur.
Answer:
B. a note being played on a saxophone
C. an opera singer breaking a glass with her voice
D. a person pushing a swing at the rate it naturally oscillates back and forth
Edge.2023
Explanation:
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14.
In an experiment, the independent variable _____.
affects the dependent variable
is a special type of control
should never be changed
changes in response to the dependent variable
Answer:
Affects the dependent variable.
Explanation:
A dependent variable is defined as the variable which is being tested during an experiment.
The dependent variable is the variable which is always dependent on the independent variable.
As in the experiments if the the value of independent variable then this change in independent variable will change the value of dependent variable.
For example: A scientist is recording the effect of light and dark on the moth by turning it off and on. In this case, the amount of light is independent variable and the moth's reaction is dependent variable. It means a change in the independent variable directly affect the dependent variable
Which satellite has the greatest gravitational force with Earth?
1. Earth and Satellite A
2. Earth and Satellite B
3. Earth and Satellite C
4. Earth and Satellite D
Satellite A has a mass (kg) of 375 and the distance from Earth (km) is 320.
Satellite B has a mass (kg) of 250 and the distance from Earth (km) is 320.
Satellite C has a mass (kg) of 50 and the distance from Earth (km) is 320.
Satellite D has a mass (kg) of 500 and the distance from Earth (km) is 320.
Answer:
Satellite D has a mass (kg) of 500 and the distance from Earth (km) is 320.
Explanation:
The universal law of gravitation states that the force between two objects in the universe is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.
We have to choose the satellite having greatest gravitational force with earth. In all options the distance from the earth is same i.e. 320 km. So, we have to select the satellite having maximum mass because the mass of the earth is constant.
Hence, the correct option is (D) " Satellite D has a mass (kg) of 500 and the distance from Earth (km) is 320 ".
Answer: Option 4, the satellite D.
Explanation: The gravitational force between two objects is given by the formula:
[tex]F = G\frac{m1*m2}{r^2}[/tex]
where m1 and m2 are the masses of the objects, G is a constant, and r is the distance between both objects.
From this equation, you can see that the gravitational force between two objects increments when the masses of the objects increases, and when the distance between the object decreases.
You can see that all the options are at the same distance from the earth, 320km, then the only factor that changes is the mass of the satellite.
And, based on the previous, the satellite with more mass is the satellite that has the greatest gravitational force with the earth, and this would be the satellite D, with amas of 500kg.
Which light packs the highest energy per photon? 1. infrared 2. red 3. blue 4. ultraviolet 5. green?
How much heat is givne out when 6.0g of water freezes at 0 degrees celcius the heat of fusion of water is 80.0 cal/g?
properties such as luster conductivity and flexibility are used to describe what type of elements