Answer:
The observable universe is still huge, but it has limits. because it's most likely like an plane all round.
Explanation:
Answer:
Yes
Explanation:
the universe is constanlty expanding at a rate of 74.3 plus or minus 2.1 kilometers (46.2 plus or minus 1.3 miles) per second per megaparsec (a megaparsec being about 3 million light-years).
Which of these chemical properties of a sheet of paper
Answer:
Paper is created mainly from organic compounds such as oxygen, carbon, hydrogen. Paper has non-organic compounds also for improving the properties.
Please mark as brainliest.
First to answer.
A boat sends a sound to the bottom of the ocean and it takes 3 seconds to return to the boat. How deep in the ocean? The speed of sound on water is 1500m/s.
Answer:
2,250 meters deep
Explanation:
If the time taken for the the signal to return to the boat means that it took 3 seconds for the signal to travel to and from the floor the same distance. That means it took 1.5 seconds to travel to the floor at a speed of 1500m/s means that it is 1500 multiplied by 1.5 to a distance of 2,250m. (Derived from the speed = distance divided by time formula to distance = speed multipled by time)
Help!!
Earth has a radius R = 1.5 x 1011 m, T= 365.3 days, and m= 5.97 x 1024 kg. Calculate the
speed of Earth around the sun, assuming a circular orbit.
Answer:
[tex]29861.23\ \text{m/s}[/tex]
Explanation:
[tex]R=\text{Radius of Earth's orbit}=1.5\times10^{11}\ \text{m}[/tex]
[tex]T=\text{Time taken by the Earth to complete the orbit}=365.3\ \text{days}[/tex]
Assuming the orbit is of circular shape the distance the Earth has to travel is the circumference
[tex]C=2\pi R\\\Rightarrow C=2\pi\times 1.5\times10^{11}\\\Rightarrow C=942477796076.938\ \text{m}[/tex]
Velocity is given by
[tex]v=\dfrac{C}{T}\\\Rightarrow v=\dfrac{942477796076.938}{365.3\times 24\times 60\times 60}\\\Rightarrow v=29861.23\ \text{m/s}[/tex]
The speed of the Earth around the Sun is [tex]29861.23\ \text{m/s}[/tex]
Find the potential energy of the bowling ball from the exercise above that is sitting on a shelf 2 meters high. Remember that g = 9.8m/s. Write equation, substitute values and units into equation, and show final answer.
Answer:
Explanation:
bv
5. A vehicle having a mass of 1000 kg had an accident on a wet, but level, concrete road under foggy
conditions. The tires were measured to have y = 0.55 on wet concrete. The driver locked the
brakes, skidded for 6 seconds, and then hit the guardrail causing a very small dent because the
vehicle stopped just as it touched the guardrail. The driver claimed to be driving 65 miles per hour
(29 m/s). You have been hired as an investigator to determine if the driver is telling the truth.
a. What is the weight of the vehicle?
b. The frictional force produces the negative acceleration that reduces the velocity of the
vehicle from its initial unknown speed to zero. Find the value of the frictional force.
Use the frictional force to calculate the acceleration (remember that it is a negative
number). Hint: Use Newton's 2nd Law.
d. Using your acceleration from partc, what was the driver's initial velocity? Hint: Use this
equation - The final velocity is 0 m/s.
6. Complete this form to let me know what your questions are. This helps me get you the help you
need - either during class or individually through videos
Answer:
Explanation:
1) weight = mg = 9.81*1000 = 9810 Newtons
2) frictional force = normal force *
we must assume that the vehicle is on a flat surface so therefore the normal force is the same as the weight of the vehicle.
frictional force = 9810 * 0.55 = 5 395.5 N
3) acceleration: F = ma, a = F/m
assume that only the frictional force is acting on the vehicle:
a = 5395.5/1000 = 5.3955 m/s
4) the car decelerates at 5.3955m/s
over 6 seconds, the car decelerates by: 32.37m/s
5) original speed = 29m/s final speed = 29-32.37 = -3.37m/s which is a negative number, therefore the vehicle would have stopped before it hit the rail.
6) to get to the rail, the vehicle would have had to be traveling at least 32.37m/s which is 72.41 mph
PLS HELP!!!- The moon rotates around the Earth every 28 days. What is the frequency of the moon’s revolution?
Answer: the frequency is every 27.322 days
1. Who were the first three countries to build rocket engines?
O Russia, Germany, China
O Germany, China, Canada
O Russia, USA, Germany
O USA. China, Russia
Answer:
i think its Russia, USA, Germany.
a nucleus with four protons have a total positive charge of what
Answer:
The name of element is Beryllium.
Explanation:
Given that,
A nucleus with four protons have a total positive charge.
Suppose, what is the name of element ?
We know that,
The name of element which have 4 positive charge is Beryllium.
Beryllium is a element which is symbol is Be.
Atomic number of beryllium is 4 and atomic mass is 9.
The number of neutrons are 5.
Hence, The name of element is Beryllium.
Spring A has a spring constant of 5 N/m and spring B has a force constant of 9 N/m. A weight of 2 kg is applied to spring A and a weight of 10 kg is applied to spring B. Which of the following is true for the final displacements of springs A and B?
a) Spring B has a larger displacement than spring A. b) Spring A has a larger displacement than spring B. c) Spring A and spring B have the same displacement.
Answer: Option A.
Spring B has a larger displacement that spring A.
Explanation:
Spring B has a larger displacement that spring A .
By using Hooke's law.
F=-Kx
Where F is force, K is spring constant and x is displacement.
For spring a
Weight / force is 2 kg
Spring constant (K) is 5/nm
Therefore,
F=-Kx
2=-5x
X=2/-5
X= -0.4m
For spring B.
Weight is 10Kg
Spring constant is 9N/m
F=-Kx
10=-9x
X=-10/9
=-1.1m
Therefore Spring B have larger displacement than spring A.
In Hooke's law, negative sign that is present on the spring's force indicate that the force exerted by the spring opposes the spring's displacement.
Why do you think the lunar cycle is longer than the time it takes the moon to orbit Earth?
Answer:
because the moon returns to the same place on the sky once every siderial period, but the sun is also moving on the sky.
Explanation:
Hope that helps!
Answer:
Because the moon returns to the same place on the sky once every siderial period (27.3 days), but the sun is also moving on the sky.Cycle of lunar phases takes 29.5 days. This is called the SYNODIC PERIOD
Explanation:
Hydrogen is found as a gas on Earth but exists in all four states in the solar
system. Four samples of hydrogen have equal masses but are each in a
different state. Which statement about the relative amounts of thermal
energy in the samples is true?
Answer: the sample of solid has less energy than the sample of gas
Explanation:
APEX
Two persons A and B are walking with the speed of 5km/h and 6km/h respectively in the same direction. Find how far will B be from A after 2 hours??
Answer:2 km
Explanation:
Who was the first person to walk on the moon ?
Answer:
god correct correct
Explanation:
I NEED HELP!!!! THIS IS DUE TODAY OCT. 14, 2020 AT 11:59 PM!!!
Keisha has two large dogs and a small dog. The dogs like to play tug-the-rope together. Each of these three diagrams shows one way that the dogs play together with the rope. Look at each arrow and the number that goes with it. They show the direction and amount of force each dog exerts on the rope. There are three illustrations of two dogs pulling at a toy rope.
The left art should show two big dogs pulling on a rope toy each pulling with a force of 20N in the opposite direction. The middle art shows a big dog on left pulling to the left on the rope toy with a force of 20N and a little dog pulling to the right with a force of 12N. The right art shows the rope toy tied to a post, with both dogs pulling on different parts of the toy and in the same direction. One large dog pulls with a force of 20 N and the small dog pulls with a force of 12 N.
Explain whether the forces shown in each diagram are balanced or unbalanced. Use math-based evidence to support your claim for each diagram.
Answer:
The answer is unbalanced
Explanation:
Though cases like these are not really how the science will be used, they illustrate the principle.
If the left art shows two big dogs pulling on a rope toy each pulling with a force of 20N in the opposite direction. The middle art shows a big dog on left pulling to the left on the rope toy with a force of 20N and a little dog pulling to the right with a force of 12N. The right art shows the rope toy tied to a post, with both dogs pulling on different parts of the toy and in the same direction. One large dog pulls with a force of 20 N and the small dog pulls with a force of 12 N. The atomic theory has been of priceless value to chemists, but it has more than once happened in the history of science that a hypothesis, after having been useful in the discovery Present and the co-ordination of knowledge, has been aban- position doned and replaced by one more in harmony with later of the discoveries
The amount of force exerted in each direction in the rope determines if the force in play is balanced or unbalanced ;
Left art : 20N = 20N (Balanced) Middle : 20N > 12N (Unbalanced) Right art : 20N > 12N (Unbalanced)To determine if the force acting in two direction is balanced or unbalanced, we calculate the net force acting on the object.
The net force = Force 1 - Force 2If the netforce = 0 ; then the force is balanced, if otherwise , then it is unbalanced.
Left art :
Net force = 20N - 20N = 0 NRight art :
20N - 12N = 8N (direction of the 20N force)Middle :
20N - 12N = 8N (direction of the 20N force)Therefore, the value of the net force determines if the force is balanced or not.
Learn more :https://brainly.com/question/14091327
my little cousin wanted me to ask this so, How does thermal energy travel to Earth?
Heat moves in three ways: Radiation, conduction, and convection. Radiation happens when heat moves as energy waves, called infrared waves, directly from its source to something else. This is how the heat from the Sun gets to Earth. In fact, all hot things radiate heat to cooler things.
2. Who was the first woman to dunk in a professional basketball game?
Answer: Lisa Leslie
Explanation: On July 30, 2002, Leslie became the first woman to dunk the ball in a WNBA game.
Answer:
Lisa Leslie
Explanation:
On July 30, 2002, Leslie became the first woman to dunk the ball in a WNBA game
Help please asap!!!!
Answer:
Line A is fastest and Line D is slowest
Explanation:
Line A is the fastest moving object because the bar is steepest. Line A travelled the furthest in the least time, so Line A is moving fastest. Line D is the slowest object because the bar is least steep. Line D travelled the least distance in the most time, so Line D moves the slowest.
Hopefully the answer and explanation helps!
How to calculate weight on
mars?
In the lab, a student is investigating the effects of texting and driving on reaction time. A
student determines his/her reaction time by having a friend release a meter stick at
random intervals while the driver sends text messages. The student, on average,
catches the meter stick after it has traveled 0.64 m.
How far will the student
travel in a car moving at 25 m/s horizontally before reacting?
9.0 m
0.64 m
69 m
We know that we can write the speed of something as the quotient between the distance it moves and the time it takes to move that distance.
speed = distance/time
Using this, we will find that the correct option is the first one, 9.0 m
The information we know is:
The student, on average, catches the meter stick after it has traveled 0.64m
We need to transform this into time.
Assuming that the meter stick is just released, the only acceleration it will have is the gravitational one, so we have:
a(t) = -9.8m/s^2
To get the velocity of the stick we need to integrate over time, as the it is just released, it will not have initial velocity, thus the constant of integration is zero:
v(t) = (-9.8m/s^2)*t
To get the position equation we need to integrate again, and as the initial position is relative, we can define it as zero, so again the constant of integration is zero:
p(t) = (1/2)(-9.8m/s^2)*t^2
p(t) = (-4.9 m/s^2)*t
We know that the student catches the stick after it traveled (downwards) 0.64m
Then we need to solve:
-0.64m = (-4.9 m/s^2)*t
√[(-0.64m)/(-4.9m/s^2)] = t = 0.36s
So the reaction time of the student is 0.36 seconds.
Now we can use the first equation:
speed = distance/time
And rewrite it as:
distance = speed*time
So if the car moves at 25m/s and the student needs 0.36 s to react, the distance that he/she will move in that time frame is:
d = (25m/s)*0.36s = 9.0m
So the correct option is the first one.
If you want to learn more, you can read:
https://brainly.com/question/12550364
What happens to potential energy as the mass of an object decreases?
Answer:
As the mass of the object decreaes, the potential energy also decreases.
Explanation:
Chlorine has 17 electrons. According to the modern atomic theory, how many electrons are found in n = 2?
Answer:
8 electrons
Explanation:
According to the modern atomic theory, the electronic configuration of chlorine (e⁻ = 17, Z = 17) is:
1 s² → 2 electrons
2 s² 2 p⁶ → 8 electrons
3 s² 3 p⁵ → 7 electrons
Total: 17 electrons
In n = 1 chlorine has 2 electrons, in n = 2 chlorine has 8 electrons and in n = 3 it has 7 electrons.
Therefore, in n = 2 chlorine has 8 electrons (2 from s orbital and 6 from p orbital).
I hope it helps you!
Consider a box sliding down horizontally across a straight line. Which of the following factors affects the amount of work done against friction in this situation?
A. Speed of the box
B. Time taken to move the box
C. Distance the box is moved
D. Direction of the box is moved
Answer:
uhhh speed of box??? I think
The factor affecting the amount of work done against friction is the distance traveled by the box.
The work done against friction is energy dissipated in reducing frictional force along the horizontal surface.
The magnitude of the work done in reducing the frictional force along the horizontal surface is given as;
W = μFd
where;
μ is the coefficient of frictionF is applied horizontal forced is the horizontal distance traveled by the boxThus, we can conclude that the factor affecting the amount of work done against friction is the distance traveled by the box.
Learn more here:https://brainly.com/question/14268613
Who is Josh Gibson write a short paragraph 3-5 sentences
Answer:
Hope this helps
Explanation:
Josh Gibson, (born December 21, 1911, Buena Vista, Georgia, U.S.—died January 20, 1947, Pittsburgh, Pennsylvania), American professional baseball catcher who was one of the most prodigious home run hitters in the game’s history. Known as “the black Babe Ruth,” Gibson is considered to be the greatest player who never played in the major leagues, there being an unwritten rule (enforced until the year of his death) against hiring black ballplayers
The mass of an object is 200 kg. What is it's weight on Earth
Answer:
1N=1 kg×m/s (sqaured)
Explanation:
basically if you are 225 lb u weigh 1000N. I hope I helped
You are in a car moving at 50 mph to the right, from the reference frame of the ground. A truck is next to you moving at 30 mph to the right, also from the reference frame of the ground. Which is true from your reference frame of the car?
a. The truck would appear to stand still.This answer is incorrect.
b. The truck would appear to be moving forward.
c. The truck would appear to be moving backward.
stored energy and the energy of positions are ________________ energy
Answer:
Gravitational Energy
Which person has the most kinetic energy?
O A. A person sitting in a chair
OB. A person sitting at the top of a slide
O C. A person riding a bicycle
O D. A person walking
A person riding a bicycle has the most kinetic energy among the given options, therefore the correct option is C.
What is mechanical energy?Mechanical energy is the combination of all the energy in motion represented by total kinetic energy and the total stored energy in the system which is represented by total potential energy.
The expression for total mechanical energy is as follows
ME= PE+KE
Where ME is the mechanical energy
PE is the total potential energy
KE is the total kinetic energy
The kinetic energy is the body depends on the mass as well as the speed of the object and is given by the mathematical expression as follows
K.E = 1/2*m*v²
where K.E is the kinetic energy of the object
m is the mass of the object
v is the velocity of the object
For the given problem and the options provided for the person riding the bicycle has the most kinetic energy among all, therefore the correct option is C.
Learn more about mechanical energy from here
brainly.com/question/12319302
#SPJ5
non-example of Newton's third law of motion
Answer:
Unbalanced forces
Explanation:
PLEASE HELP AND HURRRRY
A package is dropped from a plane flying at a constant speed. Neglecting air resistance, when the package hits the ground the horizontal location of the plane will....
A. Be behind the package
B. Depend on speed of package
C. Be directly over the package
D. Be in front of the package
Answer:
A. Be behind the package
what cells secrete myelin for neurons?
a. schwann cells
b. other neurons
c. osteocytes
d. leukocytes
Answer:
A. Schwann cells
Explanation: