Answer:
No, projectile launched at 20° landed first.
Explanation:
70° projectile had a vertical velocity of v*sin(70), which is significantly bigger than v*sin(20). Since v=vx+at, we can see that [tex]Vyi*sin(20)-gt < Vyi*sin(70)-gt[/tex]
solve for t, you can check that by substituting velocity for any number.
Answer:
well,they may or they may not. It all depends on the vertical components of the speed with which the projectile is thrown.
Explanation:
to derive the time of flight :
Considering the vertical motion (along y axis) , the journey from the ground to highest point
v=u+at ,where v=final velocity , u=initial velocity , acceleration due to gravity i.e g and t is the time taken by the particle to reach the highest point
o=u(sin theta) + (- g)t
t=u(sin theta) - g
Hence total time of flight is twice of that i.e
T=2(vertical components of speed) / g
So, if two projectile have some vertical components of velocity , they will have equal time of flight.
If the potential energy of a roller coaster is 60,000 J at the highest point, what is its kinetic energy at the lowest point?
Answer:
60 000 J
Explanation:
The PE will be converted to KE entirely (if the lowest point is ground level)
Explain why stars are unevenly distributed throughout the universe.
which statement most likely describes plutonium?
(astronomy)
if gaia's photometric instrument broke down, what would scientists be less
able to measure?
If Gaia's photometric instrument broke down. Scientists will not able to measure the electromagnetic radiation.
What is electromagnetic radiation?
Electromagnetic radiation is a type of energy that is transmitted in incident photons as both magnetic and electric waves.
Electromagnetic radiation has a spectrum with varying wavelengths and frequencies, which gives it different properties.
A device that detects the intensity of electromagnetic radiation is called as the photometric instrument.
Hence,scientists will not able to measure the electromagnetic radiation.
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COME AND HELP ME
The noble gases are unreactive and stable. Which of the following explains why this is true?
They each have no electrons.
They have 8 electrons in their outer shell (except for Helium).
They have only neutrons in their nucleus
They have more electrons than other elements.
Answer:
They have 8 electrons in their outermost shell(except for Helium)
Explanation:
The noble gases are unreactive and stable because they have completely filled orbitals and have 8 electrons in their outermost shell.
Therefore
They have 8 electrons in their outermost shell(except for Helium)
What does the path of an object look like when it is in uniform motion?
Answer:
Graphically the path of an object will be linear; it looks like a straight line when it is in uniform motion.
An object of mass m attached to a spring of force constant k oscillates with simple harmonic motion. The maximum displacement from equilibrium is a and the total mechanical energy of the system is e
An object of mass m attached to a spring of force constant k oscillates with simple harmonic motion. The system's potential energy when kinetic energy of (3/4) E is (1/8) k A².
What is mechanical energy?Mechanical energy is the sum of potential energy and kinetic energy.
Total mechanical energy = P.E max = K.E max
Total mechanical energy = K.E +P.E
Given is the kinetic energy is (3/4)E.
E= (3/4)E + P.E
P.E = (1/4) E
Maximum potential energy =E = (1/2) k A²
Here. A is the maximum displacement and k is the spring constant.
The potential energy at kinetic energy of (3/4) E is
P.E = (1/4)E = (1/8) k A²
Therefore, the system's potential energy when kinetic energy of (3/4) E is (1/8) k A².
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physics 5
physics geniuses where r u need help!!!
------------
pls also check other questions!
Answer:
0.85 A
Explanation:
the effective current is 0.85 A
PLEASE HELP WILL GIVE BRAINLIEST
Which correctly compares the background extinction rate for mammals to the actual extinction rate over the past 400 years?
A. )45 times higher
B. )25 times higher
C,35 times lower
D. )15 times lower
Answer:
45 times higher
Explanation:
hope this helps
Answer:
The background extinction rate is the average rate at which species become extinct over geological time, usually estimated in millions of years. The actual extinction rate refers to the rate at which species are currently going extinct.
Based on scientific studies, the actual extinction rate over the past 400 years is significantly higher than the background extinction rate.
The correct answer is A. 45 times higher.
Explanation:
a pendulum wiht a cord length of 1 m swings in a vertical plane, when the pendulum is in the two horizontal ositions 90 and 270 its speed is 5 m/s what is the magnitude of the radial accelertaion
The magnitude of the radial acceleration of pendulum is 25 rad/s²
What is acceleration?Acceleration can be defined as the rate change of velocity with time.
acceleration a = (Δv) / (Δt)
The centripetal acceleration or radial acceleration for the pendulum is given by
a = v²/r
Given is the radius = cord length of pendulum =1m and the velocity v = 5m/s, then the acceleration will be
a = (5)² /1
a = 25 rad/s²
Thus, the radial acceleration is 25 rad/s²
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Describe the different components of Kabuki and explain their uses
Answer:
Like the three kanji characters that make up the word, kabuki consists of ka (singing), bu (dancing) and ki (skill). In addition to these three components, kabuki is characterized by unique stage sets such as a revolving platform that allows for nearly instant set changes and a runway that stretches into the audience.
Your center of gravity should never be over the center of your base of support if you want to be stable.
O A. True
OB. False
A current carrying wire of length 50cm is positioned perpendicular to a uniform magnetic field
A current-carrying wire of length 50 cm is positioned perpendicular to a uniform magnetic field. The magnetic field strength is 0.6 Tesla.
What is magnetic field?The magnetic field is the region of space where an object experiences a magnetic force as it enters the field.
Given is the wire of length 50 cm = 0.5 m and the current is 10.0 A. There is a resultant force of 3.0 N on the wire due to the interaction of the current and field.
The relation between magnetic field strength and current is
F = ILB
Substituting 50 for L, 10 for I and 3 for F, we get the magnetic field strength B.
3 = 10 × 0.5 × B
B= 0.6 Tesla
Therefore, the magnetic field strength is 0.6 Tesla.
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7. The outlets in your home provide
a. direct current.
b, alternating current.
c. electric discharge.
d. static electricity.
Make me as brainliest
Answer:
b
Explanation:
The outlets in your home provide alternating current. An example of a direct source would be a battery.
The study of spectral lines from the messier 81 galaxy suggests that it is moving toward earth. identify the color toward which these spectral lines shift when visible light from the messier 81 galaxy is observed on earth.
The color towards which these spectral lines shifts when visible light from messier 81 galaxy is observed on planet Earth is a blue shift or violet.
What is a redshift?A redshift can be defined as a displacement (shift) of the spectral lines of astronomical objects such as messier 81 galaxy, toward longer wavelengths as a result of the Doppler effect.
In this scenario, we can infer and logically conclude that the color towards which these spectral lines would shift when visible light from the messier 81 galaxy is observed on planet Earth is a blue shift or violet.
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Type the correct answer in the box. Express your answer to three significant figures.
Calcium nitrate reacts with sodium phosphate to form sodium nitrate and calcium phosphate. Given 96.1 grams of calcium nitrate, what's the
theoretical yield of calcium phosphate? Use the periodic table and the polyatomic ion resource.
The mass of calcium phosphate the reaction can produce is
grams.
The mass of calcium phosphate the reaction can produce is 6.076 grams.
What is mass?Mass is a numerical measure of inertia, which is a basic feature of all matter. It is, in effect, a body of matter's resistance to a change in speed or position caused by the application of a force.
In the International System of Units (SI), the kilogram is the unit of mass.
Given;
Mass of calcium nitrate (Ca(NO₃)₂) = 96.1 g
Mass of calcium phosphate=?
The chemical equation is found as;
3Ca(NO₃)₂ + 2Na₃PO₄ → 6NaNO₃ + Ca₃(PO4)₂
3 moles of Ca(NO₃)₂ produces 1 mole of Ca₃(PO4)molar mass of calcium phosphate is 164 g/mol
Moles are found as the ratio of the mass of the compound and its molar mass. Moles of Ca(NO₃)₂ is n.
n = 96.1/164 = 0.5859 moles
Moles of Ca3(PO4)2 produced ;
N=0.0589 ×(1/3) = 0.0196 moles
The molar mass of calcium phosphate is 310 g/mol and the mass of calcium phosphate produced will be;
M=0.0196×310
M = 6.076 g
Hence,the mass of calcium phosphate the reaction can produce is 6.076 grams.
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Mechanical energy is as much of potential and kinetic energy. Mechanical energy is never lost but only transformed from one form to another. As long as all the mechanical energy is as much as the potential energy then the kinetic energy is 0J. The mechanical energy of an object is found by summing its potential energy and kinetic energy.
Please hellllooooppp
Answer:
to the east i would say as i have tryed looking it up and carnt fimd the answer so i would saythe east or the north
Explanation:
you should choose as i dont no as it is a toss between those two
When the pd-106 nucleus is struck with an alpha particle, a proton is produced along with a new element. What is this new element?.
What is the wavelength of an electromagnetic wave having a
frequency of 1 hertz? of 100,000 hertz?
Answer:
c = λ f
λ = c / f
λ = 3E8 / 1 = 3.00E8 m wavelength of 1 hertz
λ = 3E8 / 1E5 = 3000 m wavelength of 100,000 hertz
How long does it take light to reach Earth from an object on light-year away?
Answer:
The short answer is that it takes sunlight an average of 8 minutes and 20 seconds to travel from the Sun to the Earth.
Explanation:
how long does it take sunlight to reach Earth? This sounds like a strange question, but think about it. Sunlight travels at the speed of light. Photons emitted from the surface of the Sun need to travel across the vacuum of space to reach our eyes. If the Sun suddenly disappeared from the Universe (not that this could actually happen, don't panic), it would take a little more than 8 minutes before you realized it was time to put on a sweater.
Can anyone please explain this point with an example. I have presentation tomorrow.
Energy efficiency can either be achieved by either reducing the quantity of energy consumption to produce certain amount of products or producing increased number of products from the same quantity of energy.
Explanation:
Efficiency is a way of describing the amount of useful output a process or machine can generate as a percentage of the input required to make it go. In other words, it compares how much energy is used to do work versus how much is lost or wasted to the environment. The more efficient the machine, the less energy wasted.
For example, if a heat engine is able to turn 75 percent of the fuel it receives into motion, while 25 percent is lost as heat in the process, it would be 75 percent efficient. Out of the original 100 percent of the fuel, 75 percent was output as useful work.
the equation:
energy efficiency =useful output energy/total input energy
Car makers have developed cars that are completely electric. They use no gasoline. Instead, they are plugged into electrical outlets. The cars store electricity from the outlets in their batteries. They use the electricity to move. Some people claim that these electric cars are “emission-free”—that is, that they produce no air pollution. Are plug-in electric cars really emission-free? Explain your answer.
Answer:
yes bc we are wasting gas and this will help use less
Explanation:
When summer changes to fall, what seasonal changes do plants experience? (IGNORE HIGHLIGHTED ANSWER)
Answer:
C
Explanation:
There is a decrease in temperature and daylight and plants produce less food.
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1. Which of the following transformations is an example of a β−-decay?
2.The unstable uranium nuclide 238 92U has a half-life of 4.5 billion years and decays into the thorium nuclide 234 90Th. The thorium daughter nuclide has a half-life of 24.1 days and decays into the protactinium nuclide 234 91Pa, which has a half-life of 6.75 hours and decays into 234 90U, whose half-life is 245 thousand years. In a sample of uranium-containing rock, of the four nuclides the most abundant will be __________.
3. The beta minus decay process 13 7N→13 6C+β−+ν¯¯¯ is proposed in which nitrogen’s proton becomes a neutron. The process is not possible because:
4.The fact that the relative abundance is greater for elements in which the total number of protons and neutrons is a multiple of two is because __________.
Answer:
1. C: 31/14 Si becomes 31/15 because a nuetron
2. A: 238 92U because the very long half-life means a very small rate of decay
3. D: Charge conservation is not satisfied
4. B: of the four nuclear decay processes only the α-decay changes the baryon number and does so in increments of four
Explanation:
I just took the quick check. Enjoy the answers I did not get to have
a jet plane travels 1500 km in 2 hours. what is the speed of the jet
Answer:
Speed = distance / time
= 1500 /2
= 750 km/h
A car decelerates uniformly from 20 m s' to
zero in a time interval of 2.0 s. What are its
acceleration and distance travelled during this
time interval?
Two charges are separted by a distance d and exert mutual attractive forces of f on each other. If the charges are separated by a distate of 2d what are the new mutual forces?
The new force between the charges when the distance become 2d will be F'=4F
What is electrostatic force?
When two charged particles are separated by the distance d then the force of attraction or repultion acts on the charged particle depending upon the nature of the charge whether it is positive or negative.
The formula for the electrostatic force is given by
[tex]F=\dfrac{kq_1q_2}{d^2}[/tex]
Now if the value of d becomes 2d then the formula will become:
[tex]F'=\dfrac{kq_1q_2}{(2d)^2}=\dfrac{kq_1q_2}{4d}[/tex]
[tex]\dfrac{F'}{F}=\dfrac{1}{4}[/tex]
[tex]F=4F'[/tex]
Hence the new force between the charges when the distance become 2d will be F'=4F
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What causes refraction as waves move from one medium to another?.
The cause of refraction as waves move from one medium to another is : Change in speed of Light
Meaning of RefractionRefraction can be defined as the change in direction of a wave as it passes from one medium to another medium.
Refraction is observed in many wave form but it is more prominent and visible when it comes to light wave.
In conclusion, The cause of refraction as waves move from one medium to another is : Change in speed of Light
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How does the speed of light change as the index of refraction increases?.
[tex]\huge{\green}\fcolorbox{blue}{cyan}{\bf{\underline{\red{\color{red}Answer}}}} [/tex]
So as the index of refraction value increases, the optical density increases, and the speed of light in that material decreases.