Answer:
2.72 km
Explanation:
(12.33 km)/ 1 hr * (1 hr)/ 60 min
0.2055 km/ min
distance=rate * time (assuming v is constant,
a=0)
(0.2055 km/ min)*(13.22 min)
2.72 km OR 2716.71 m
Five 6 ohm resistors are connected in parallel. Which of the following is their effective resistance?
A. 6 ohm
B. 1.2 ohm
C. 30 ohm
D. 5/6 ohm
1/Rt = 1/R1 + 1/R2 + 1/R3+ 1/R4+ 1/R5
1/Rt = 1/6+ 1/6+1/6+1/6+1/6
1/Rt = 5/6
Rt = 6/5
Rt = 1.2 ohm
so B is the answer
Why was Copernicus reluctant to publish his ideas?
Answer:
He was scared
Explanation:
Answer:
He Feared persecution .
Explanation:
Which of the following is not a factor that is required for the formation of hurricanes?
A: Very high winds in the upper atmosphere
B: Ocean temperatures of atleast 80 degrees F
C: Low winds in the upper atmosphere
D: Warm, moist air
Answer:
Either A or D
Explanation:
Answer:
c
Explanation:
its c because high winds foRM A HURRICAN AND WARM TO AND ESPECIALY IF IT IS 80 DEGRESES
Ignoring air resistance, if a 20 kg ball and a 400 kg crate were both dropped from the
top of a building, the acceleration of the crate would be
the acceleration
of the ball.
Which is the process by which a solid changes to a liquid?
Answer:
melting.
Explanation:
The process in which a solid changes to a liquid is called melting. The melting point is the temperature at which a solid changes to a liquid.
A block slides to the right on a rough horizontal surface. The forces exerted on the block are shown above. Which of the following statements about the frictional force Ff exerted on the block is true?
A) It is the only force acting on the block that is caused by microscopic interactions.
B) It does not depend on the materials that the block and the surface are made of.
C) It is caused by gravitational interactions between the atoms in the block and the atoms in the surface.
D) It is the sum of all the microscopic contact forces between the bottom of the block and the surface.
Answer:
The correct option is;
A) It is the only force acting on the block that is causes by microscopic interactions
Explanation:
The force of friction is the force due to the relative motion of two surfaces in the presence of a perpendicular force acting between the surfaces.
The force of friction comes into play from the additional effect of the adhesion that is present between surfaces, the roughness of the surfaces, the contamination or deformation of the surfaces which is generated by the microscopic interactions be between the two surfaces, rather than the applied force.
The characteristics of the friction force, you can find which statements are correct:
D) It is the sum of all the microscopic contact forces between the bottom of the block and the surface.
The force is an image of the interactions between bodies, these interactions create binding energy that can be formed and broken, the friction force is the macroscopic sum of all these microscopic interactions between two different surfaces.
The magnitude of the friction force depends on the type of each surface, on rough surfaces the interaction area is high, therefore the friction force is high, on smooth surfaces the interaction area is small, therefore the force is small, a way to create superficiality is to place a layer of air between the two surfaces.
Based on these explanations, let's review the different statements:
A) False. The friction forces are caused by interaction, but between two bodies not within the same body, this is what maintains the shape and volume of the body.
B) False. The contact area depends on each surface and therefore each type of material
C) False. The gravitational force is this in the line of interaction between the two bodies, in this case the force is perpendicular to movement, not in the line of interaction.
D) True. It is the sum of the interactions in the contact between the two bodies, it agrees with the explanation above.
Using the characteristics of the friction force, we can find the statements that are correct is:
D) It is the sum of all the microscopic contact forces between the bottom of the block and the surface.
Learn more about friction force here: brainly.com/question/1714663
look at the photo thank you
Answer: The ballon could get rub on a carpet to gain electricity and it would have enoght force
Explanation:
2
If the velocity of a bicycle is 10 m/s, how long will it take to cover a distance
of 18 km?
(Ans: 1800 s)
1800 sec = 30 min
Explanation:Hi there !
18km = 18×1000m = 18000 m
1 s ............... 10m
x s ...............18000m
x = 1×18000/10 = 1800 sec = 30 min
Good luck !
A car is traveling down the highway cruise control at 50m/s (this means its is traveling with a constant velocity NOT accelerating). If it does this for 5 minutes (300s), how far does it travel?
Given parameters:
Speed of car = 50m/s
Time of travel = 5minutes (300s)
Unknown;
Distance of travel = ?
To solve this problem, we need to understand how speed relates with distance and time.
Speed is a physical quantity. It is the distance traveled divided by time taken.
Speed = [tex]\frac{distance}{time}[/tex]
So,
Distance = speed x time
Input the parameters and solve for the distance;
Distance = 50m/s x 300s
Distance = 15000m
The distance covered during this time interval and speed is 15000m
If an element has an atomic number of 28, how many protons does it have in its nucleus?
Acceleration
A car traveling to the right speeds up from Okm/h to 50km/h in 8s. Convert the time from seconds to minutes.
Explanation:
Initial speed, u = 0 km/h
Final sped, v = 50 km/h
Time, t = 8 s
1 minute = 60 seconds
⇒ 1 s = (1/60) minutes
⇒8 s = 0.1334 minutes
Acceleration,
[tex]a=\dfrac{v-u}{t}\\\\a=\dfrac{50\cdot\dfrac{5}{18}}{8}\\\\a=1.73\ m/s^2[/tex]
Hence, this is the required solution.
Earth, has a bigger mass than the Moon .
if you'll be able to go to the moon,
what happens to your weight?
An automobile traveling along a straight road
increases its speed from 53 ft/s to 68 ft/s in
180 ft.
If the acceleration is constant. how much
time elapses while the auto moves the 180 ft?
Answer in units of s.
Answer:
t = 2.97[s]
Explanation:
To solve this problem we must use the following kinematics equations, we must bear in mind that the positive sign of the acceleration value means that the car is increased its speed.
[tex]v_{f}^{2} =v_{o}^{2} +(2*a*(x-x_{o} ))[/tex]
where:
x - xo = 180 [ft]
a = acceleration [ft/s^2]
Vo = initial velocity = 53 [ft/s]
Vf = final velocity = 68 [ft/s]
Now replacing we find:
(68^2) = (53^2) + (2*a*180)
a = 5.04 [ft/s^2]
Now using the following equation:
[tex]v_{f}=v_{0}+a*t[/tex]
68 = 53 + (5.04*t)
t = (68 - 53)/5.04
t = 2.97[s]
a testable prediction about a possible to a problem is called a,
a: exercise
b: variable
c: hypothesis
d: experiment
Answer: C
A hypothesis is a testable explanation with some research behind it. An Hypothesis can be right or wrong.
The answer is C.
Hope it helps!
Answer:
c. is the answer but I'm not 100% sure
hypothesis
A ball is thrown vertically down from the edge of a cliff with a speed of 4 m/s,
how high is the cliff, if it took 12 s for the ball to reach the ground?
RACTICE Uranium (molar mass = 283.03 g/mol) has the largest molar mass of any element naturally found on Earth. What is the mass of 7.50 mol of uranium?
Answer:
The answer is 2122.73 gExplanation:
The mass of a substance given it's molar mass and number of moles can be found by using the formula
mass = Molar mass × number of moles
From the question
molar mass = 283.03 g/mol
number of moles = 7.5 mol
So we have
mass = 283.03 × 7.5 = 2122.725
We have the final answer as
2122.73 gHope this helps you
Determine the 3 standing waves for a 4 m length of rope.
Harmonics, Loop and Harmonic number
Hope this helps :)
why is vitual force theory? why was it discarted
Answer:
I am not very sure of the first question
The second one which is why it discarted it is that because someone named Friedrich Wohler showed that it was possible to obtain an organic compound in the laboratory.
Which of the following is a unit of volume in the English system of measurement? (4 points)
Meters
Gallons
Liters per cubic gram
Kilograms per cubic centimeter
Answer:
Explanation:
the answer is gallons because i got it right on the exam
Contact forces & friction. Please help!!! (20 points & brainliest!)
Let w denote the weight of the box, n the magnitude of the normal force (the sheet pushing up on the box), k the magnitude of the kinetic friction force, and µ the coefficient of kinetic friction.
The kinetic friction force doesn't kick in until the sheet is tilted at an angle θ₂. Since the box is sliding down at constant speed, it's in equilibrium and the forces acting on it sum to 0.
In the horizontal direction (literally left-and-right, parallel to the ground and not the sheet), we have only the horizontal components of the friction and normal forces to worry about, so that [tex]\mathbf n_x+\mathbf f_x=\mathbf0[/tex], which reduces to
f cos(θ₂) + n cos(90º + θ₂) = 0
(where we take the right to be positive and left to be negative)
Recall that cos(90º + x) = -sin(x) for all x, and that the friction force is proportional to the normal force by a factor of µ. This gives
µ n cos(θ₂) - n sin(θ₂) = 0
Solve for µ :
µ n cos(θ₂) = n sin(θ₂)
µ = sin(θ₂) / cos(θ₂)
µ = tan(θ₂)
What are the properties of a photon?
Answer:
Properties of a photon would be:
does not have a electric chargedoes not have a massphotons are stableknown to carry energyExplanation:
Remember that photons are a quantum of light that carry energy while having no mass, they're used mainly in cameras and in other machinery that helps emit radiation.
Hope this helps.
Which is a sedimentary rock?
A: cools down
B: has large crystals
C: forms in layers
D: is formed from pressure and heat
ANSWER ASAP!!!
Answer:
d. is formed from pressure and heat
Explanation:
it is formed from hot magam
Neglecting air resistance, if you throw a ball straight up with a speed of 20 m/s how fast will it be moving when you catch it
A batter hits the baseball A with an initial velocity of v0 = 100 ft/sec directly toward fi elder B at an angle of 30° to the horizontal; the initial position of the ball is 3 ft above ground level. Fielder B requires 14 sec to judge where the ball should be caught and begins moving to that position with constant speed. Because of great experience, fi elder B chooses his running speed so that he arrives at the "catch position" simultaneously with the baseball. The catch position is the fi eld location at which the ball altitude is 7 ft. Determine the velocity of the ball relative to the fi elder at the instant the catch is made.
Answer:
47.4 ft/s
Explanation:
Using v² = u² - 2gs where u = initial vertical velocity of ball = 100sin30, v = final vertical velocity of ball at the time it was caught by the fielder, g = acceleration due to gravity = 32 ft/s² and s = vertical displacement = y₂ - y₁, y₁ = 3 ft and y₂ = 7 ft. s = y₂ - y₁ = 7 - 3 = 4 ft
Substituting these values into the equation, we have
v² = u² - 2gs
v² = (100sin30)² - 2 × 32ft/s² × 4 ft
v² = (100sin30 ft/s)² - 256 ft²/s²
v² = (50 ft/s)² - 256 ft²/s²
v² = 2500 ft²/s² - 256 ft²/s²
v² = 2244 ft²/s²
v = √2244 ft²/s²
v = 47.37 ft/s
v ≅ 47.4 ft/s
So, the velocity of the ball relative to the fielder at the instant the catch is made is 47.4 ft/s.
PLEASE HELP ME!!!
Which of the following connect to the energy conversions that happen when you plug a vacuum into an electrical outlet and turn it on?
A.)kinetic, chemical, sound
B.)sound, nuclear, electrical
C.)chemical, nuclear, electrical
D.)sound, thermal, kinetic
Answer:
I think is B. sound, nuclear, electrical
but if I wrong then I am so sorry
PLZ HELP!
The image here shows four soccer balls at four different locations on an uneven soccer field very near sea level. Which soccer ball has the greatest amount of potential energy?
Ball B
Ball C
Ball A
Ball D
Answer:
The answer is B.
Explanation:
Because that's the one that's more-so higher up than the other soccer balls. This grants the ball to have higher potential energy than the rest.
Quote:
"Your body is as weak as your soul, so it is easy to separate the two."
- Akuma
The ball b would have the greatest amount of the potential energy as the mass of each ball is the same then the ball on the highest altitude would have the greatest amount of the potential energy contained with it.
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 mechanical energy = potential energy + kinetic energy
As given in the problem, the image here shows four soccer balls at four different locations on an uneven soccer field very near sea level.
The potential energy of the ball = mass×gravity×height
Since each ball's mass is the same, the ball at the highest altitude would have the most potential energy within it. As a result, ball b would have the greatest quantity of potential energy.
Thus,the correct answer is option A.
Learn more about mechanical energy from here, refer to the link;
brainly.com/question/12319302
#SPJ2
Which is a true statement about a series circuit?
A.) Every part of the circuit is positively charged.
B.) The current flow through every part of the circuit is the same.
C.) The current through the circuit can take several paths.
D.) Every part of the circuit is negatively charged.
Please help, I'm on a time limit!
the answer is B your welcome
The true statement about a series circuit is: the current flow through every part of the circuit is the same. Hence, option (B) is correct.
What are series and parallel circuit?Electrical networks and two-terminal components can be linked either serially or parallelly. The electrical network that results will have two terminals and be capable of operating in either a series or parallel topology.
It depends on your point of view whether a two-terminal "thing" is an electrical network (like resistors connected in series) or an electrical component (like a resistor). In this article, a two-terminal "thing" that participates in series/parallel networks will be referred to as a "component."
Each component connected in series travels the same "electrical path" and carries the same amount of current—equal to the network's current—through it.
Learn more about series circuit here:
https://brainly.com/question/14997346
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A 50kg boy stands on a horizontal rough ground. The coefficient with a static friction is 0.68. The maximum static friction between the boy and the ground is ?
Answer:333
Explanation:
The north pole of a bar magnet is moved close to the north pole of a second bar magnet. What prediction best describes how the first magnet responds when it is released? It will move toward the second magnet because like poles repel. It will move toward the second magnet because like poles attract. It will move away from the second magnet because like poles repel. It will move away from the second magnet because like poles attract.
Answer:
C. It will move away from the second magnet because like poles repel.
Explanation:
Answer:
C
Explanation:
How does the approximate number of atoms
in the air in your lungs compare to the num-
ber of breaths of air in the atmosphere of the
whole world?
I don’t understand what this is asking...
