A ball is thrown directly downward with an initial speed of 8.05m/s, from a height of 30.2m. After what time interval does it strike the ground?
Answers
-16x^2+8.05x+30.2
Use quadratic formula to get about 1.9 ish
AGAIN PROBABLY WRONG
Answer:
2.9 seconds
Explanation:
The time we must take is positive since it has a valid physical answer, The negative one stands for traveling to the past something still we are unable to do.
Related Questions
Five equal negative charges are uniformly spaced in a semicircular
arc of radius ro with its center at the origin. The charges positions in
polar coordinates are given by (o. 6.), where the values of 0 are 0°,
45°, 90°. 135º. and 180°. At the position (x, y) = (ro, -ro) in the 4th
quadrant, which statement best describes the direction of the
resulting electric field?
The direction is that of a 3rd quadrant angle.
The direction is that of a 2nd quadrant angle.
The direction is that of a 1st quadrant angle.
The direction is that of a 4th quadrant angle.
Answers
Answer:
The direction is that of a 3rd quadrant angle
Explanation:
when you have 2 45 angles it equals to 90 then with the 90 we multiply by 2 due to the 2 adjacent angles equating to 180 which swings it to the 3rd quadrant angle
Which statement best describes monsoons? They force cool, moist air from oceans to rise. They are winds that blow in the opposite direction of a normal wind. They bring heavy rain in the winter and in the summer. They influence precipitation as wind moves near a mountain.
Answers
Answer:
They are winds that blow in the opposite direction of a normal wind
Explanation:
Answer:
B.) They are winds that blow in the opposite direction of a normal wind.
Explanation:
it's correct trust
Help me pls I'm struggling
Answers
Answer:
2. The temperature doubles.
014) 48.6 J
015) 13,700 J
016) 5.94×10⁻²¹ J
Explanation:
PV = nRT
P and n are constant.
nR/P = k
V/T = k
If the volume doubles, the temperature also doubles.
014) The kinetic energy per atom is:
KE = 3/2 kT
KE = 3/2 (1.38×10⁻²³ J/K) (21 + 273) K
KE = 6.09×10⁻²¹ J
The total kinetic energy is:
KE = (6.09×10⁻²¹ J) (7.99×10²¹)
KE = 48.6 J
016) The kinetic energy per atom is:
KE = 3/2 kT
KE = 3/2 (1.38×10⁻²³ J/K) (14 + 273) K
KE = 5.94×10⁻²¹ J
015) The total kinetic energy is:
KE = (5.94×10⁻²¹ J) (3.82 mol) (6.02×10²³ atom/mol)
KE = 13,700 J
A boy on a chairlift moving parallel to the mountain slope at a speed of +15 m/s watches a skier going straight down the mountain with a speed of -35 m/s. What is the velocity of the skier relative to the chairlift? A. -50 m/s B. -35 m/s C. -20 m/s D. +15 m/s E. +50 m/s
Answers
Answer:
A. -50 m/s
Explanation:
Given
Velocity of Chairlift = +15m/s
Velocity of Skier = -35m/s
Required
Determine the velocity of the skier relative to the chairlift
Basically, relative velocity is the difference between the two velocities;
Having said that;
Relative velocity of the skier relative to the chairlift = Velocity of the Skier - Velocity of the Chairlift
Relative velocity of the skier relative to the chairlift = -35m/s - (+15m/s)
Open bracket
Relative velocity of the skier relative to the chairlift = -35m/s - 15m/s
Relative velocity of the skier relative to the chairlift = -50
When very electronegative atoms, like oxygen, bond to atoms with a lower
electronegativity, like hydrogen, what's the result?
O A. The oxygen atom becomes strongly positive.
O B. The oxygen atom becomes strongly negative.
O C. The hydrogen atom becomes partially positive.
O D. The hydrogen atom becomes partially negative.
Answers
Answer:
Explanation:
B the oxygen atom becomes strongly positive
and
C HE HYDROGEN ATOM BECOMES PARTIALLY POSITIVE
PLS MARK MY ANSWER AS THE BRANLIEST
Based on the free-body diagram, the net force acting on this wheelbarrow is {blank} N.
Answers
Answer:
diagram?
Explanation:
Answer:
-150
Explanation:
I just did it on EDGE2020, and it's 100% correct! Please heart and rate if you found this answer helpful.
Help me please, I need it
Answers
Answer:
3000 m/s
Explanation:
The kinetic energy is:
KE = 3/2 kT
where k is Boltzmann constant and T is absolute temperature.
Kinetic energy is also:
KE = 1/2 mv²
where m is the mass and v is the speed.
1/2 mv² = 3/2 kT
mv² = 3kT
v = √(3kT / m)
v = √(3 × 1.38×10⁻²³ J/K × (273 + 27) K / 1.38×10⁻²⁷ kg)
v = 3000 m/s
help me please, help me
Answers
for the question w the coffee cup and the dishwasher: 19,536.72 J
for the question w the 3 pots of boiling water: They all have the same temperature
for the question w the copper: 103.84 Celsius
(Not sure what the other 2 pictures are about but good luck)
0
Which of the following can you conclude about a particle labeled
Check all that apply.
O A. It has one electron.
OB. It has one neutron.
I C. It has one nucleon.
O D. It has one proton.
E. It is negatively charged.
OF. It is an alpha particle.
O G. It is a beta particle.
Answers
Answer:
B and C
Explanation:
The given symbol [tex]_{-1}^{0}e[/tex] denotes an electron. An electrons has neglecting mass and has one unit of negative charge. Thus, option A is correct.
What is an electrons?An electron is a subatomic particle. the other subatomic particles that constitutes an atom are neutrons and protons. neutrons and protons are located inside the nucleus and electrons are revolving around the nucleus through circular paths of fixed energies.
Electrons are having negative charge and protons are positively charged particles. For an atom the number of protons and electrons are the same. Therefore, an element in its atomic state is neutral.
Neutrons are neutral. However both neutrons and protons are having significant mass compared to an electrons. Hence, the representation of electrons include zero mass and -1 charge. Hence, option A is correct.
To find more on electrons, refer here:
https://brainly.com/question/1255220
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When do we use v=2s/t and what does that equation mean?
Answers
Answer:
This can be used to find out the speed of the returned journey. The equation means speed = returned distance ÷ time.
Explanation:
Please help, I need you, please help me
Answers
Answer:
14 mL
Explanation:
Ideal gas law:
PV = nRT
If n is constant, then:
PV / T = PV / T
(0.819 atm) (17.9 mL) / (273 + 28) K = (0.99 atm) V / (273 + 13) K
V = 14 mL
What's true about the elliptical path that the planets follow around the sun?
A)
A line can be drawn from the planet to the sun that follows the same curve as the
ellipse.
B)
A vector can be drawn from the center of one planet to the center of an adjacent
planet.
C)
A line can be drawn from the planet to the sun that sweeps out equal areas in equal
times.
D)
A scalar can be measured from the angle that the planet travels relative to the sun's
orbit.
Answers
A magnifying glass uses a convex lens of focal length 5.25 cm. When it is held 5.00 cm in front of an object, what magnification does it create? pls help
Answers
Answer:
21
Explanation:
what are the physical changes on water
Answers
At summer camp, the swimming course runs the length (L) of a small lake. To determine the length of the course, the camp counselors measure the two "dry" legs of a right triangle. What is the length in meters of the swimming course in the figure below?
Answers
Answer:
47 m
Explanation:
Data obtained from the question include the following:
Length of dry leg 1 (L1) = 40 m
Length of dry leg 2 (L2) = 25 m
Length of swimming course (L) =..?
The length of the swimming course can be obtained by using pythagoras theory as shown below:
L² = L1² + L2²
L² = 40² + 25²
L² = 1600 + 625
L² = 2225
Take the square root of both side.
L = √2225
L = 47.1 ≈ 47 m
Therefore, the length of the swimming course is approximately 47 m.
* explain in your own words the phrase ,
'' a cell has a voltage of 1.5V''
plz help!!
Will give the brainliest!
plz answer correctly.
Answers
First of all, what is a cell?
A cell is a power source. It converts chemical energy into electrical energy which then allows a current to flow.
Then, what is a voltage?
A voltage is an electrical force required to push an electric current.
The answer to your question
The powers source requires a voltage of 1.5 to push the electrical current around the circuit
Changes in which property are heard when the Doppler effect occurs? pitch amplitude volume wavelength
Answers
Changes in pitch are heard when the Doppler effect occurs.
What is the Doppler effect?The Doppler effect, also known as the Doppler shift, is a term used to explain changes in frequency caused by moving sources of sound or light with regard to an observer.
The Doppler effect is the apparent change in frequency or wavelength of a wave that is perceived by an observer when the source of the wave or the observer is moving relative to each other.
In the case of sound waves, if the source of the sound is moving towards the observer, the frequency of the sound waves is perceived to be higher, resulting in a higher-pitched sound.
Conversely, if the source of the sound is moving away from the observer, the frequency of the sound waves is perceived to be lower, resulting in a lower-pitched sound.
This effect can be observed in many everyday situations, such as the changing pitch of a siren as an ambulance or police car passes by.
Learn more about doppler's effect here:
https://brainly.com/question/15318474
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Answer:
option A) pitch
Explanation:
2023 :)
Ice sinks in methanol, but floats on water. From this we can conclude: A The density of ice in methanol must be different from that in water. B The density of water must be less than the density of methanol. C The density of ice must be greater than the density of water. D The density of methanol must be less than the density of water.
Answers
Answer:
D The density of methanol must be less than the density of water.
Explanation:
Ice sinks in methanol, so the density of ice is greater than the density of methanol.
Ice floats in water, so the density of ice is less than the density of water.
Since the density of ice is the same in each case, the density of methanol must be less than the density of water.
ρ_methanol < ρ_ice < ρ_water
help pls 30 points need help
Answers
Answer:
C
Explanation:
Answer:
I believe the answer is C.
Explanation:
Help me please, MathPhys be my hero :)
Answers
Answer:
T = 261 K
T = -12.2°C
Explanation:
PV = nRT
If P and n are constant:
V / T = V / T
2.75 L / (273.15 + 21) K = 2.44 L / T
T = 261 K
T = -12.2°C
Which of the following is an accurate statement? A. Step-up voltage transformers have fewer turns in the primary that in the secondary winding. B. aC generators produce current that's pulsating but always remains positive C. Step-down voltage transformers have a different number of turns in the primary than in the secondary winding, so they change the incoming collage to a higher voltage D. DC generators produce current with a voltage that changes from positive to negative
Answers
Answer:
Option A is an accurate one.
Explanation:
A transformer being considered as a step-up transformer during which the performance (supplementary) voltage becomes stronger than that of the input (main) impedance of it. This kind of transformer reduces the electrical output to constantly keep the product input as well as power consumption equivalent.The other provided alternative is not related to the information provided there. So the response to the above seems to be the correct one.
What has resulted in significant climate changes?
A. Plate tectonics
B. Doppler effects
C. Water pollution
Answers
Answer:A
Explanation:glass window allow light in but trap the heat inside
Plate tectonics cause climate change when moved together
Example: you rub your foot across the carpet causing heat
Help me please, help
Answers
Answer:
455,000 Pa
Explanation:
PV = nRT
If n is constant:
PV / T = PV / T
(101,325 Pa) (718 mL) / (273 K) = P (175 mL) / (26 + 273) K
P = 455,000 Pa
If the angle of incidence of a light source to a shiny surface is 30 degrees, what will the angle
of reflection be?
150 degrees
90 degrees
60 degrees
30 degrees
Answers
Angle of incidence always equals angle of reflection. Think of a tennis ball being hit into a wall. The ball will bounce off at the same angle that it approached with. The angles mentioned are formed through the line called the "normal", which is the line perpendicular to the surface.
*** HOPE THIS HELP YOU***
Which types of waves requires matter to carry energy? electromagnetic waves only mechanical waves only electromagnetic and mechanical waves longitudinal and electromagnetic waves
Answers
Answer: Mechanical waves
Explanation:
Mechanical waves require a medium in order to transport their energy from one location to another. A sound wave is an example of a mechanical wave. Sound waves are incapable of traveling through a vacuum.
Answer:
Mechanical waves
Explanation:
edge 22'
Nia has $19.50 to ride the subway around New York. It will cost her $0.75 every time she rides. Identify the dependent variable and independent variable in this scenario.
A The number of rides and the total cost are both independent variables.
B The number of rides and the total cost are both dependent variables.
C The number of rides is the independent variable, and the total cost is the dependent variable.
D The total cost is the independent variable, and the number of rides is the dependent variable.
Answers
Answer:
C The number of rides is the independent variable, and the total cost is the dependent variable.
Explanation:
The total cost is the dependent variable, because it depends on the number of rides. The number of rides is the independent variable; it is the variable that Nia controls.
Label the parts of the brain. medulla oblongata thalamus cerebrum cerebellum brain stem pons hypothalamus midbrain
Answers
Answer:
Medulla oblongata is lower part of brain.
Cerebrum and cerebellum are the upper hemispheres of the brain.
Explanation:
Cerebrum is the largest part of the brain and is composed of right and left hemispheres.
Cerebellum is the part of brain that lies inside the cerebellum.
Medulla Oblongata is lowest part of brain stem which is most vital part of the brain.
Thalamus is a small region of the brain located above the brain stem. Its main function is to transmit sensory signals to cerebral cortex.
Brain stem act as relay center connecting the cerebrum and cerebellum to the spinal chord.
Hypothalamus is the mid brain located near the pituitary glands. It is very small region of the brain but it plays an important role in maintaining the body temperature and releasing the hormones.
Answer:
Medulla oblongata: The bottom part of the brainstem helps regulate your breathing, heart rhythms, blood pressure and swallowing.
Explanation:
A person with a mass of 15 kg is walking uphill at a velocity of 2 m/s. What is the walker's
momentum?
A) 15 kg-m/s
B) 30 kg-m/s
C) 10 kg-m/s
D) 13 kg-m/s
Answers
Answer:
30kg-m/s
Explanation:
momentum = mass x velocity
15 x 2 = 30
Research and discuss the aurora borealis in
terms of electric charges, magnetic fields,
and forces. Which times of the year are best
for seeing the northern lights, and where are
the best places to view them? Explain your
answers. Also identify links to good images. If
you've ever seen the aurora borealis,
describe your experience and note the time
and place that you saw it.
Answers
Answer: the best times to see it would be from 10 pm to 1 am, meaning when the night skies are dark and clear. The best months to see it would be from April to late August. Whereas the best places in the world to view them would be closer to the arctic circle, this includes Canada, Alaska, Iceland and Greenland.
Explanation:
Hope this helps
Auroras are created by disruptions in the magnetosphere induced by the solar wind. The greatest times to see it are between 10 p.m. and 1 a.m.
What is aurora borealis?Auroras are created by disruptions in the magnetosphere induced by the solar wind. The paths of charged particles in the magnetospheric plasma are altered as a result of these disruptions.
These particles, primarily electrons, and protons fall to the upper atmosphere.
The greatest times to see it are between 10 p.m. and 1 a.m. when the night skies are dark and clear. It is recommended to visit between April and late August.
The greatest spots to see them are closer to the arctic circle, which encompasses Canada, Alaska, Iceland, and Greenland.
Hence the greatest times to see it are between 10 p.m. and 1 a.m.
To learn more about the aurora borealis refer to the link;
https://brainly.com/question/25766402
Why does precipitation occur after water condenses in clouds?
Answers
Answer:
Precipitation forms in the clouds when water vapor condenses into bigger and bigger droplets of water
Explanation:
Precipitation forms in the clouds when water vapor condenses into bigger and bigger droplets of water. When the drops are heavy enough, they fall to the Earth. If a cloud is colder, like it would be at higher altitudes, the water droplets may freeze to form ice.
Precipitation forms in the clouds when water vapor condenses into bigger and bigger droplets of water. When the drops are heavy enough, they fall to the Earth.