Answer:
21s
Explanation:
Given parameters;
Radius = 10m
Speed or velocity = 3m/s
Unknown:
Period = ?
Solution:
To solve this problem, use the expression:
v = [tex]\frac{2\pi r}{T}[/tex]
r is the radius
T is the unknown
Input the parameters and solve for T;
3 = [tex]\frac{2 x \pi x 10}{T}[/tex]
62.84 = 3T
T = 21s
Which statement accurately describes radioactive dating?
a. Geologists use only one type of radioactive dating.
b. Geologists compare parent and daughter elements to determine rock type.
c. Geologists will measure how stable multiple parent elements can decay into multiple daughter elements.
d. Geologists compare the observed abundance of naturally occurring radioactive isotopes and their decay products using decay rates.
Answer: C. is the answer
Explanation:
Answer:
D
Explanation:
took the test :D
a plane travels West for a distance of 750 km the trip takes 45 minutes calculate the planes velocity in terms of km/hr
A man standing on top of a 30 m tall building throws a brick downwards with a velocity of 12 m/s. Determine the speed of the brick just before it hits the ground.
Answer:
27.1m/s
Explanation:
Given parameters:
Height of the building = 30m
Initial velocity = 12m/s
Unknown:
Final velocity = ?
Solution:
We apply one of the kinematics equation to solve this problem:
v² = u² + 2gh
v is the final velocity
u is the initial velocity
g is the acceleration due to gravity
h is the height
v² = 12² + (2 x 9.8 x 30)
v = 27.1m/s
What is the mass of an object which has a momentum of 560 kg m/s and is traveling at 15 m/s?
Answer:
plane
Explanation:
A car is traveling at a velocity of 22 m/s when the driver puts on the brakes
to decelerate it at 1.4 m/s? over a distance of 110 m. What is the car's
velocity at the end of this distance?
Answer:
v = v +at = 22 + (1.6 6.8 s ms) = 33 ms
Explanation:
Im so nervous about something and I need advice!!! PPPLLLLZZZZ DO NOT REPORT!! WILL MARK BRAINLIEST!!!
Answer: depends on what your nervous about
Explanation:tell me what your nervous about
The electric field between two parallel plates has a magnitude of 180 N/C. The two plates are 2.5 cm apart. Recall that the magnitude of the charge on an electron is 1.602 × 10-19 C.
How much work is done to move an electron from the positive plate to the negative plate?
4.0 × 10-21 J
7.2 × 10-19 J
4.5 J
7200 J
Answer:
b
Explanation:
The amount of work done to move an electron from the positive plate to the negative plate is : 7.2 * [tex]10^{-19}[/tex] J
Step 1: Given data
magnitude of two parallel plate ( E ) = 180 N/C
Distance between plates ( d ) = 2.5 cm
magnitude of charge on electron ( e ) = [tex]1.602 * 10^{-19}[/tex] C
Step 2 : determine the work done
Work done = qV = еEd
= [tex]1.602 * 10^{-19}[/tex] * 180 * 2.5
= 720 * [tex]10^{-22}[/tex] J ≈ 7.2 * [tex]10^{-19}[/tex] J
Hence the amount of work done to move an electron from the positive plate to the negative plate = 7.2 * [tex]10^{-19}[/tex] J
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25 POINTS!!!
Copy this concept map, and then use vocabulary terms from the previous page to complete the concept map.
VOCAB
Mechanical wave
Electromagnetic wave
Transverse wave
Longitudinal wave
Frequency
Amplitude
Refraction
Radio wave
Infrared wave
Ultraviolet wave
Transparent
Translucent
Opaque
Intensity
Compression
Rarefaction
Pitch
Decibel
What is the density of a box measuring 100 grams and 10 ml?
Answer:
In order to convert density to grams, you have to put the mass on one side of the equation, and the density and the volume on the other. Therefore, d * v = m. Multiply the density by the volume. Using the example in step 1, you would multiply 2 g/mL by 4mL.
Explanation:
ok
An object of mass 2kg raised to a height 10m possess potential energy of 200J. What is the kinetic energy and potential energy at a height 4 metre?
Explanation:
[tex]{\bold{\sf{\underline{Understanding \: the \: concept}}}}[/tex]
✠ This question says that there is an object and its mass is 2 kg ; it's raised to a height 10 m and possess potential energy of 200 J. Now this question ask us to find the kinetic energy and the potential energy at a height 4 metre.
[tex]\bold{↬{ }}[/tex][tex]{\bold{\sf{\underline{Given \: that}}}}[/tex]
✰ Mass = 2 kilograms
✰ Raised height = 10 metres
✰ Posses potential energy = 200 Joules
[tex]\bold{↬{ }}[/tex][tex]{\bold{\sf{\underline{To \: find}}}}[/tex]
✰ Kinetic energy at a height 4 metre
✰ Potential energy at a height 4 metre
[tex]{\bold{\sf{\underline{Solution}}}}[/tex]
✰ Kinetic energy at a height 4 metre = 120 J
✰ Potential energy at a height 4 metre = 80 J
[tex]{\bold{\sf{\underline{Using \: concepts}}}}[/tex]
✰ Potential energy formula.
[tex]{\bold{\sf{\underline{Using \: formula}}}}[/tex]
✰ Potential energy = mgh
[tex]{\bold{\sf{\underline{We \: also \: write \: these \: as}}}}[/tex]
✰ Potential energy as P.E
✰ Mass as m
✰ Joules as J
✰ Height as h
✰ Raised height as g
[tex]{\bold{\sf{\underline{Full \: solution}}}}[/tex]
✠ Let us find the Potential energy.↦ Potential energy = mgh
↦ Potential energy = 2 × 10 × 4
↦ Potential energy = 20 × 4
↦ Potential energy = 80 J
✠ Now according to the question let us find the kinetic energy↦ Kinetic energy = Posses potential energy - Finded potential energy
↦ Kinetic energy = 200 J - 80 J
↦ Kinetic energy = 120 Joules
An object of mass 2kg raised to a height 10m possess potential energy of 200J.
to find:-What is the kinetic energy and potential energy at a height 4 metre?
solution:-from energy conservation,
potential energy at 10m height =potential energy +kinetic energy at 4 m
potential energy at 10 m height=200
let,Kinetic energy at 4m=KE
potential energy at 4m=PE
so,
200=KE+PEpotential energy at 4m height =
mgh2×10×480Hence,
kinetic energy at 4m is =200-80=120J
A sailboat sits tied up at the dock.
Which forces are acting on it?
(A)
applied force and tension force
(B)
electrical force and applied force
(C)
gravity and electrical force
(D)
tension force and gravity
Answer:B
Explanation:i think so im not suree
A sailboat that is tied up at the dock will experience tension force and gravity. Therefore, option (D) is correct.
What is the tension force?Tension can be described as a force acting along the flexible length of a medium such as a rope, string, or cable, or a force carried by a flexible medium.
Tension can be defined as an action-reaction pair acting at each end of the elements. For a rope, tension is present in every section of the rope or string in both directions, apart from their endpoints. Each endpoint of the rope will experience tension and force from the weight attached to it.
Tension can also be defined as a pulling force but the tension is not a pushing force. Ropes or strings are used to exert forces since they transfer a force over a specific distance.
Therefore, sailboats experience the tension force due to the rope with which it is tied at the dock and the force due to gravity.
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Which of the following statements about Copernicus' heliocentric model of the Solar System are accurate?
It was the first such model was supported by scientific evidence.
It was not published until Copernicus was close to death.
It was the first time a heliocentric model had ever been suggested.
It was not controversial, and was readily accepted.
It stated that the Sun revolved around the Earth.
It stated that the Earth revolved around the Sun.
Answer:
(i) It was the first such model was supported by scientific evidence: FALSE
(ii) It was not published until Copernicus was close to death: TRUE
(iii) It was the first time a heliocentric model had ever been suggested: FALSE
(iv) It was not controversial, and was readily accepted: FALSE
(v) It stated that the Sun revolved around the Earth: FALSE
(vi) It stated that the Earth revolved around the Sun: TRUE
Explanation:
We proceed to demonstrate the validity of each option from statement:
(i) It was the first such model was supported by scientific evidence: FALSE
The geocentric model was based mostly on interpretation of two astronomical findings: (a) The displacement of the stars with respect to Earth due to stellar parallax, (b) The apparent consistency of brightness of the planet Venus seen from Earth.
(ii) It was not published until Copernicus was close to death: TRUE
Copernicus published his heliocentric theory, contained in the book De revolutionibus orbium coelestium, months before his death, in 1543.
(iii) It was the first time a heliocentric model had ever been suggested: FALSE
Greek mathematician and astronomer Aristarchus of Samos was the first person who proposed the heliocentric model in the 4th Century.
(iv) It was not controversial, and was readily accepted: FALSE
The Roman Catholic Church defended geocentric model proposed by Claudius Ptolemy and Tycho Brahe and rejected the model proposed by Copernicus, whose publication was included in the Index Librorum Prohibitorum in 1616.
(v) It stated that the Sun revolved around the Earth: FALSE
This is the main idea of the geocentric model.
(vi) It stated that the Earth revolved around the Sun: TRUE
This is the main idea of the heliocentric model.
Which statement about the relationship between mass in air and altitude is accurate?
A) Mass in air is unrelated to altitude
B) Mass in air increases as altitude increases
C) Mass in air increases as altitude decreases
D) Mass in air decreases as altitude decreases
Answer:
A) Mass in air is unrelated to altitude
Explanation:
Mass is the amount of matter contained in a substance. Altitude is the height of a body above a reference plane.
Mass and altitude are unrelated.
The mass of given body is the same everywhere in the universe provided no loss or gain of matter. Altitude increases as distance from the reference widens. Most often times, as altitude increases, temperature reduces due to the nature of the troposphere.how would something make more energy in order to travel farther and faster
Answer:
hit it harder
Explanation:
Endicott Kendrick
When does an object falling vertically through the air reach terminal velocity?
(1 Point)
A: when the acceleration of the object becomes negative
B: when the acceleration of the object is equal to g
C:when the air resistance equals the weight of the object
D:when the air resistance is greater than the weight of the object
Answer:
a. when the acceleration of the objects become negative
help meeeeeeeeeeee
i need help on drawing a school gym for one of my classes
Answer:
a little to late
Explanation:
srry
Can someone do this pls! I’ll give you brainilest and all my points!
Answer:
15N South
Explanation:
It is 15N South because the two 15N cancel out each other and then you subtract 5N from the 20N and then you get left with 15N. and the 20N is bigger and it is going South.So the answer is 25N south.
Answer:
the answer would be 15N south
What is the resultant of the vectors shown?
Answer:
b
Explanation:
your welcome :)
Which type of wave has the longest wavelength?
Gamma rays
Ultraviolet rays
Visible light
Microwaves
Radio waves
Answer:
Radio Waves
Explanation:
the human body station 2
Answer:
...?
Explanation:
50 Points!
1. How does the speaker know that the lump of metal she is holding is an asteroid?
2. How does the speaker “hunt” asteroids? Describe how teams of scientists collect data about asteroids.
3. Both speakers describe the asteroid that hit Earth and caused a massive extinction, including the decimation of the dinosaurs. The speakers describe the size of this asteroid in different terms. Summarize each speaker’s description and explain which one gives you a better picture of the size of this asteroid.
4. Does Carrie Nugent agree with Phil Plait’s assessment that we can defend the Earth from asteroids? Why or why not?
Answer:
How does the speaker know that the lump of metal she is holding is an asteroid?
The patterns formed inside the metal She explains that the rock is older the earth and that it is an asteroid due to the patterns formed inside it that show it contains metallic crystals that cannot be formed on earth but in space where temperatures mean that molten metal takes billions of years to cool.
How does the speaker “hunt” asteroids? Describe how teams of scientists collect data about asteroids.
The speaker works with astroids she attempts to search for them for scientific use. She analyzes how long ago these rocks were coming acrost the earth. How many are in the universe.
Both speakers describe the asteroid that hit Earth and caused a massive extinction, including the decimation of the dinosaurs. The speakers describe the size of this asteroid in different terms. Summarize each speaker’s description and explain which one gives you a better picture of the size of this asteroid.
Debris from the impact orbiting around the Earth shielded sunlight, halting photosynthesis.
The impact was so extreme that life at ground zero was vaporized.
tsunamis, landslides, earthquakes, and heat caused by the impact killed organisms near the site of impact.
Does Carrie Nugent agree with Phil Plait’s assessment that we can defend the Earth from asteroids? Why or why not?
It seems as if she does agree. I believe she has strong intentions to defend the earth and to prevent there to be any more extinction for any more animals I believe she cares to explore and recover so if she could find a way to use the asteroids to her advantage she would.
Explanation:
6. How does the speaker know that the lump of metal she is holding is an asteroid?
- The speaker knows that the lump of metal she is holding is an asteroid because the patterns formed inside the metal. She explains that the rock is older than the earth and that it is an asteroid. This is due to the patterns formed inside it. These patterns show that it contains metallic crystals that cannot be formed on earth, but instead in space where temperatures mean that molten metal takes billions of years to cool. The scientists also use representative sampling. This is done when they deal with such large quantities of objects for estimating.
7. How does the speaker “hunt” asteroids? Describe how teams of scientists collect data about asteroids.
- The speaker “hunts” for asteroids by attempting to search for them for scientific use. She analyzes how long ago these rocks were coming across the earth and how many are in the universe. She also is classifying them by color and shape. Some of the objects can be classified into one or more categories and this could lead to disagreements on where they should or should not be listed. Also, the objects can be difficult to see properly.
8. Both speakers describe the asteroid that hit Earth and caused a massive extinction, including the decimation of the dinosaurs. The speakers describe the size of this asteroid in different terms. Summarize each speaker’s description and explain which one gives you a better picture of the size of this asteroid.
- The asteroid hit at high velocity and effectively vaporized. It made a huge crater, so in the immediate area there was total devastation. A huge blast wave and heatwave went out and it threw vast amounts of material up into the atmosphere. 'It sent soot travelling all around the world.
9. Does Carrie Nugent agree with Phil Plait’s assessment that we can defend the Earth from asteroids? Why or why not?
- I would say that it seems to me as though she does agree. I believe she has strong intentions to defend the earth and to prevent any more extinctions for any more animals. I believe she cares to explore and recover in order to hopefully help find a way to use asteroids to her advantage. On top of that, the object shown is an Irregular galaxy. This can be determined by the fact it has an irregular shape.
Name two sub-kingdoms of plant kingdoms
Answer:
⭐. cryptogams ( non-flowering & non-seed bearing)
⭐. phanerogams ( flowering & seed bearing)
A ray of light travelling in air enters obliquely into water. Does the light ray bends towards the normal or away from the normal? Why?
Explanation:
The refraction index of water (1.33) is higher than air (1), therefore the light ray will bend towards the normal.
Pleaaaase help meeee
Read the following case and discuss how you would respond to the situation.
PROBLEM:
You have been assigned the position of Environmental Engineer for one of several local
robotics manufacturers whose water discharges flow into a lake in a flourishing tourist area.
Although all the robotics companies in the area are marginally profitable, they compete for
the same customers. Included in your responsibilities is the monitoring of water and air
discharges
at your plant and the periodic preparation of reports to be submitted to the Department of
Natural Resources. You have just prepared a report that indicates that the
level of pollution in the plant's water discharges slightly exceeds the legal limitations. Your
boss, the Plant Manager, says you should regard the excess as a mere
"technicality," and he asks you to "adjust" the data so that the plant appears to be in
compliance. He says that the slight excess is not going to endanger human or fish
life any more than if the plant were in compliance. On the other hand, he says, solving the
problem would require a very heavy investment in new equipment. He
explains, "We can't afford new equipment. It might even cost a few jobs. It will set us
behind our competitors. Besides the bad publicity we'd get, it might scare off
some of the tourist industry, making it worse for everybody."
1) How do you think you should respond to your boss's request? Explain :
2) Define the problem :
3) what are the possible results of decision?
4) is there any information about the situation that is not obvious or available in the paragraph?
5) what are the ethical issues to consider in this situation
6) How did you decide to handle the situation what did you decide to do?
Answer:
3
Explanation:
What is the momentum of a 120 pound bicyclist that is traveling at 25 mph?
i need help with this i don’t understand
Answer:
I TOO DONT UNDERSTAND ☹☹☹☹✌✌✌
please help me!! will mark brainliest
What is the electric potential at a distance of 1.2 m from a 7.5 UC point charge?
5.6 x 104 v
8.1 x 104 V
5.6 % 1010 V
8.1 x 1010 V
Answer:
5.6x10^4
Explanation:
use the equation V=kq/d
k is the constant 8.99x10^9
V=(8.99x10^9)q/d
q is the charge, 7.5 micro coulombs, but to get coulombs, multiply by 10^-6
V=(8.99x10^9)(7.5x10^-6)/d
And from the problem, we know that the distance is 1.2 meters
V=(8.99x10^9)(7.5x10^-6)/1.2
This simplifies to 5.6x10^4
The electric potential is 5.6 x 10⁴ v.
To find the electric potential the distance = 1.2 m
Charge q = 7.5 UC
What is electric potential and find the value?The amount of work needed to move a unit charge from the known point to some unknown point against the electric field is said to be electric potential.
Formula of an electric potential is
V = k ( q/r) volt
V - electric potential
k - Coulomb constant (8.99x10^9)
q - charge
r- distance of separation
V = (8.99x10⁹) (q/d)
q = 7.5 UC ( micro coulomb) 10⁻⁶ C
V=(8.99x10⁹)(7.5x10⁻⁶)/d
Substituting the values,
V=(8.99x10⁹)(7.5x10⁻⁶)/1.2
V = 5.6x10⁴ v
Thus, option A is correct.
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What must occur to produce electric current?
The distance that the pointer of a galvanometer moves depends on the amount of magnetism in the loops of the armature.
Please select the best answer from the choices provided
T
F
