Answer:
(B)
Explanation:
I did it in USATestprep.
Ms. Mann's experiment illustrates several important facts in science that include all except for Opposite charges repel, as opposite charges attract. Thus, the correct option for this question is B.
What is a Scientific experiment?A scientific experiment may be characterized as a type of scientific test or investigation in which you have to perform a sequence of actions and carefully observe their consequences in order to derive some logical and unknowing facts.
According to the context of this question, like charges always repel one another, while opposite charges may definitely attract to each other. Friction can cause a transfer of charge from one object to another. Attractive forces can work at a distance.
Therefore, Ms. Mann's experiment illustrates several important facts in science that include all except for Opposite charges repel, as opposite charges attract. Thus, the correct option for this question is B.
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Explain how magnetic stripes on the ocean floor are evidence for sea-floor spreading.
Answer:
Explanation:
•Scientists have found that the rocks that make up the seabed are hidden in their "threads". This strip contains a record of the rotation of the Earth's magnetic field. The rocks on the seabed contain iron. ... When the rock cools down, the iron fragments inside align with the direction of the Earth's magnetic poles.
How fast will you hit the ground if you jumped off the school and fell straight down and it took
1.5 s
depends on how high the school is. how high is it?
Explanation:
How is a reflection in a mirror like an echo?
Explanation:
an echo mimics exactly what is said, this is like a mirror because when you look in a mirror every action you make is copied by your reflection
What will the final velocity of a 5.0 g bullet starting from rest, if a net force of 45 N is applied over a distance of 0.80 m?
Answer:
The final velocity of the bullet is approximately 3.795 m/s
Explanation:
The given parameters are;
The mass of the bullet, m = 5.0 g
The force applied to the bullet, F = 45 N
The distance over which the force is applied, d = 0.80 m
Therefore, we have;
The final kinetic energy of the bullet = = 1/2 × m × v² = The work done on the bullet by the 45 N force = F × d
Where;
v = The final velocity of the bullet
By substitution, we get;
The final kinetic energy of the bullet = 1/2 × 5.0 × v² = 45 × 0.8
1/2 × 5.0 × v² = 45 × 0.8
v² = (45 × 0.8)/(1/2 × 5.0) = 14.4
v = √14.4 ≈ 3.795
The final velocity of the bullet = v ≈ 3.795 m/s
What fraction of carbon-14 remains undecayed after 2,865 years?
Answer:
5,730 years
i literally took a test on this question yesterday, lol
Explanation:
Hopefully this helped, if not HMU and i will try my best to get u a better answer, and if u need help with anything just let me know and i got u! :)
The fact that objects fall to earth at the same speed is called
Answer:
The Equivalence Principle of Gravity
Explanation:
The fact that objects fall to earth at the same speed is called the Equivalence Principle of Gravity.
What is the Equivalence Principle of Gravity?According to the Equivalence Principle of Gravity, all things fall at the same rate when there is little to no air resistance. The value of the acceleration caused by gravity is demonstrated by the force of gravity equation to be a constant that is independent of the mass of the item.
According to Einstein's equivalence principle, it is unnecessary to distinguish between gravitational and inertial forces because they are comparable in nature.
The inertia force acts in the opposite direction of an object's accelerating force.As a result, the Einstein equivalence principle can be expressed as "the effects of gravity are exactly identical to the effects of acceleration."Therefore, the Equivalence Principle of Gravity states that all objects descend to Earth at the same rate.
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how to find initial velocity
Answer:
Velocity= Distance divided by time divided by degree or direction.
Explanation:
Speed=DIstance divided by time
The sound level in a certain seat at the movie theater is higher than the level in the surrounding seats. Which wave interaction can help to explain why?
Absorption
Reflection
Destructive interference
Constructive inference
A p e x
Answer: constructive interference
Explanation: plz mark Brainly
Answer:
constructive interference
Explanation:
a p e x :))
Aaron rode her bike to his house to play cards he Road for 1.6 hours at 6.5 KMH another 15 minutes at four KMH what was her average speed during her trip
Answer:
The average speed during the trip is 6.16 [tex]\frac{km}{hour}[/tex]
Explanation:
Speed is a physical quantity that expresses the variation in position of an object and as a function of time. In other words, speed expresses the relationship between the space traveled by an object, the time used for it and its direction.
The speed can be calculated by the expression:
[tex]Speed=\frac{distance}{time}[/tex]
Aaron rode his bike home for 1.6 hours at 6.5 km/h and another 15 minutes at 4 km/h. So, the distance in each of the stages can be calculated as, taking into account that 60 minutes= 1 hour:
distance1=speed*time= 6.5 [tex]\frac{km}{h}[/tex] *1.6 hours= 10.4 kmdistance2= speed*time= 4 [tex]\frac{km}{h}[/tex] *15 minutes= 4 [tex]\frac{km}{h}[/tex] *0.25 hours= 1 kmSo:
total distance= 10.4 km + 1 km= 11.4 kmtotal time= 1.6 hours + 0.25 hours= 1.85 hoursThen:
[tex]Speed=\frac{11.4 km}{1.85 hours}[/tex]
[tex]Speed=6.16\frac{km}{hour}[/tex]
The average speed during the trip is 6.16 [tex]\frac{km}{hour}[/tex]
John travels 250 miles North, but then 105 miles South to pick up a friend. What is his total distance and displacement? 355 miles total distance and 355 miles South displacement 145 miles total distance and 355 miles North displacement 145 miles total distance and 145 miles South displacement 355 miles total distance and 145 miles North displacement
Answer:
The displacement is 145 m in the north direction and the distance is 355 miles.
Explanation:
The distance traveled by a mobile is the length of its trajectory and it is a scalar quantity. In other words, distance refers to the space traveled by an object during its movement. It is calculated as the sum of all the distances traveled. In this case:
250 miles + 105 miles= 355 miles
On the other hand, displacement refers to the distance from a start position to an end position regardless of the travel. That is, like distance, displacement is a measure of length. Instead, the displacement is a vector quantity that depends on the direction, so it is described from the magnitude and the direction.
Mathematically, the displacement d is calculated as:
d = df - di
where df is the final position and di is the initial position of the object.
In this case:
displacement= 250 miles - 105 miles= 145 miles
Since the north distance is greater than the south distance, then the displacement is 145 m in the north direction and the distance is 355 miles.
The air in a tire pump has a volume of 1.50L at a temperature of 5◦C. If the temperature is increased to 30◦C and the pressure remains constant, what is the new volume? Hurry Please!
Answer:
1.6L
Explanation:
Given parameters:
Initial volume = 1.5L
Initial temperature = 5°C = 5 + 273 = 278K
Final temperature = 30°C = 30 + 273 = 303K
Unknown:
Final or new volume = ?
Solution;
Since pressure is constant, we simply apply Charles's law to solve this problem.
Using the expression below,
[tex]\frac{V_{1} }{T_{1} }[/tex] = [tex]\frac{V_{2} }{T_{2} }[/tex]
V and T are volume and temperature
1 and 2 are initial and final states
Insert the parameters and solve;
[tex]\frac{1.5}{278}[/tex] = [tex]\frac{V_{2} }{303}[/tex]
278V₂ = 1.5 x 303
V₂ = 1.6L
Two people, each of mass 59 kg are standing 2.0 m away from each other. What is the magnitude of the gravitational attraction between them? Note: The constant if universal gravity (G) equals 6.674x10^-11 N m^2/kg^2. A. 5.8x10^-8 N.
B. 1.2x10^-7 N.
C. 8.5x10^3 N.
D. 2.0x10^-9 N.
E. 9.8x10^-10 N
Answer:
b
Explanation:
Which of these pairs of quantities is used to describe the transfer of energy to or from a substance? A. heat and work B. heat and kinetic energy C. work and potential energy D. potential energy and kinetic energy
Answer:
B. heat and kinetic energy
Explanation:
Heat is a form of energy that flows with respect to temperature difference. Thus, heat energy would flow from an object with higher temperature to that at lower temperature. It generally cascades from a high temperature body to lower temperature body through a medium or when in contact.
Kinetic energy is the energy that is inherent in a moving object. Thus, it can be converted to other forms or transferred between objects. Example, a moving object can transfer part of its kinetic energy to an object at rest on collision. This may cause the motion of the initial stationary object.
Therefore, heat and kinetic energy can be used to describe transfer of energy to or from a substance.
Based on the graph, which data point is most likely to have experimental
error?
A. 72 kg
B. 59 kg
C. 62 kg
D. 48 kg
Answer:
B. 59 kg
Explanation:
From the graph you notice that a linear relation in indicated by the line joining the points such that the points on the line represent the data that show a correct relationship in the experiment.
This means that the point outside the line has an error .
This point is the value 59 kg that does not align with other values which are included in the graph.
Answer:
59kg
Explanation:
when we go up From the earth surface.what happens about the atmospheric pressure
Answer:
There are two reasons why air pressure decreases as altitude increases: density and depth of the atmosphere. Most gas molecules in the atmosphere are pulled close to Earth's surface by gravity, so gas particles are denser near the surface.
Explanation:
Gless has a hardness that is in the middle of the hardness scale. What is the hardness of Glass?
Answer:
5.5 to 7 Mohs
Explanation:
Glass ranks around 5.5 to 7 Mohs, but sapphire crystal has a hardness of 9 Mohs, making it only slightly less hard than diamond.
Answer: 5.5
Explanation:
Several hardness scales have been developed to catalog the materials (specifical minerals), being the Mohs scale the best known. This scale, proposed by the German geologist Friedrich Mohs in 1825, consists of a ratio of ten minerals numbered in increasing order by hardness, from least to greatest.
You are enjoying a ride on a Ferris Wheel. The wheel has a circumference of 1,250m. The velocity of the wheel is 12m/s. How many minutes is one trip around the wheel?
Answer:
Time = 1.44 minutes
Explanation:
Given that the circumference of the wheel is 1250 m, which is the distance to be covered.
Thus,
speed =
distance = 1250 m, speed = 12 m/s.
So that;
12 =
time =
= 104.16667
time = 104.17 s
But, 60 seconds = 1 minute
time = 1.4417
= 1.44 minutes
The time required for one trip around the wheel is 1.44 minutes.
Why don't protons stick together?
Answer:
The protons must feel a repulsive force from the other neighboring protons. This is where the strong nuclear force comes in. ... If they can't get that close, the strong force is too weak to make them stick together, and other competing forces (usually the electromagnetic force) can influence the particles to move apart.^o^
Answer:
Because, they are of the same charge that is, + and +, + can't go with another +.
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A softball has a mass of 0.18 kg. What is the gravitational force on Earth due to the ball, and what is the Earth's resulting acceleration? Earth's mass is 6.0 x 1024 kg.
Answer:F=1.7802
Explanation:
Since we've been given the mass to be .18kg,we are asked to find the Force of which the formulae is
F=ma where f-force,m-mass and a-acceleration due to gravity
So we can just substitute
F-?.m=.18 and a9.89
F=.18×9.89
F=1.7802N
The gravitational force on Earth due to the ball will be 1..769 N . While the Earth's resulting acceleration will be 2.9 ×10²³ m/sec².
What is gravitational force?Newton's law of gravity states that each particle having mass in the universe attracts each other particle with a force known as the gravitational force
The given data in the problem is;
m is the mass of ball=0.18 kg
F is the gravitational force=?
m is the mass of earth= 6.0 x 1024 kg.
r is the radius of earth = 6.3781×106 m
G is the universal gravitational constant= 6.67408×10-11 Nm/kg2
The gravitational force is given by;
[tex]\rm F_G=\frac{ G m_1m_2}{r^2} \\\\ \rm F_G=\frac{ 6.67 \times 10^{-11} 0.18 \times 6.0 \times 10^{24}}{6.3781\times 10^6)2}[/tex]
[tex]\rm F_G= 1.769 N[/tex]
Hence the gravitational force on Earth due to the ball will be 1..769 N.
The force is given as the product of mass and acceleration. So that the value of acceleration is found by;
[tex]\rm a= \frac{F}{m} \\\\ \rm a= \frac{1.769}{6.0 \times 10^{24}}[/tex]
[tex]\rm a= 2.9 \times10^{-23}[/tex] m/sec²
Hence the Earth's resulting acceleration will be 2.9 ×10²³ m/sec².
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if we bring a 200. kg lunar rover to the moon, what will happen to its mass and weights? (g=1.6 m/s2 on the moon)
Answer:
W = 320 [N]
Explanation:
In order to solve this problem, we must take into account that weight is defined as the product of mass by gravity.
[tex]W=m*g[/tex]
where:
W = weight [N] (units of Newtons)
m = mass = 200 [kg]
g = gravity acceleration = 1.6 [m/s²]
The mass is always conserved, independent of the location of the body in space.
[tex]W = 200*1.6\\W = 320 [N][/tex]
How does the total kinetic energy equation of a cannonball system change as mass of the cannon increases and the energy of the blast remains the same?
A. The total kinetic energy cannot be determined.
B. The total kinetic energy decreases.
C. The total kinetic energy increases.
D. The total kinetic energy remains the same.
When the mass of the cannon increases and the energy of the blast remains the same, the total kinetic energy remains the same.
Kinetic energy refers to the form of energy that an object possesses due to its motion. It is known as the work that's required to move a body.
It should be noted that when there is an increase in the mass of the cannon while the energy of the blast remains the same, then in such a situation, the total kinetic energy will remain the same.
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A force of 5N pushes a ball to the right, and a force of 7N pushes the ball to the left. How will the forces affect the ball’s motion?
answer:- external force is 2 N .
The force that impacts the ball motion is external force i.e. 2N.
Given that,
A force of 5N pushes a ball to the right. And a force of 7N pushes the ball to the left.Based on the above information, the calculation is as follows:
= 7N - 5N
= 2N
This 2N represents the external force.
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What kind of energy do most electric inventions give off?
Answer:
Electricity?
Explanation:
By what factor will the Electrostatic Force between two charged objects change when the amount of charge on both objects doubles AND the distance between the two charged objects triples?
Answer:
F' = (4/9)F
Explanation:
The electrostatic force between two charged objects is given by Coulomb's Law:
F = kq₁q₂/r² -------------------- equation (1)
where,
F = Electrostatic Force
k = Coulomb's Constant
q₁ = magnitude of first charge
q₂ = magnitude of second charge
r = distance between charges
Now, when the charges and distance altered as follows:
q₁' = 2q₁
q₂' = 2q₂
r' = 3r
Then,
F' = kq₁'q₂'/r'²
F' = k(2q₁)(2q₂)/(3r)²
F' = (4/9)kq₁q₂/r²
using equation (1):
F' = (4/9)F
An 18 000-kg freight car travelling 1.75 m/s[E] collides with a 27 000-kg freight car at rest. After the collision, the freight cars stick together. What is the velocity of the freight cars after the collision?
Answer:
The velocity of the freight cars after collision is 0.7 m/s
Explanation:
Given;
mass of the first freight car, m₁ = 18000 kg
initial speed of the first freight car, u₁ = 1.75 m/s
mass of the second freight car, m₂ = 27000 kg
initial speed of the second freight car, u₂ = 0
Let the velocity of the freight cars after collision = v
Apply the principle of conservation of linear momentum;
m₁u₁ + m₂u₂ = v(m₁ + m₂)
18000(1.75) + 27000(0) = v(18000 + 27000)
31500 = 45000v
v = 31500 / 45000
v = 0.7 m/s
Therefore, the velocity of the freight cars after collision is 0.7 m/s
What is the density of wood
i hope it will help you
Explanation:
density to the amount of wood in a unit , per volume of wood. the ratio of dry weight and green volume of the given wood is basic wood density.
Anaerobic metabolism:
A. Lasts much longer than aerobic metabolism.
B. Leads to muscle strain.
C. Lasts a short amount of time before the aerobic process kicks in.
D. Is only common in elite athletes.
Explanation:
B. leads to muscle strain.
which situation results in the most attraction between two magnets?
A. the north pole of one magnet is far away from the north pole of the other magnet.
B. the South pole of one magnet is near the South pole of the other magnet.
C. the north pole of one magnet is near the South pole of the other magnet.
D. The north pole of one magnet is far away from the South pole of the other magnet.
Answer:
C
Explanation:
Opposites attract, the north pole of one of the magnet is attracted to the south pole of the other magnet. Two north or south poles will repel away from each other.
The north pole of one magnet is near the South pole of the other magnet.
The ends of a magnet are called its poles. One end is called the north pole, the other is called the south pole. If you line up two magnets so that the south pole of one faces the north pole of the other, the magnets will pull toward each other. This is called attraction.
What is magnet ?"A magnet is a material or object that produces a magnetic field. This magnetic field is invisible but is responsible for the most notable property of a magnet: a force that pulls on other ferromagnetic materials, such as iron, steel, nickel, cobalt, etc. and attracts or repels other magnets."
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This diagram shows two different forces acting on a skateboarder. The
combined mass of the skateboard and the person is 65.2 kg. Based on this
information, what is the acceleration of the skateboarder?
Air resistance = 55.20 N
Applied force = 31.80
si
A. 0.36 m/s2 to the left
B. 1.46 m/s2 to the left
C. 0.36 m/s2 to the right
D. 1.47m/s2 to the right
Answer:
Option A. 0.36 m/s to the left
Explanation:
From the question given above, the following data were obtained:
Force resistance (Fᵣ) = 55.2 N
Applied force (Fₐ) = 31.8 N
Mass (m) = 65.2 kg.
Acceleration (a) =?
Next, we shall determine the net force acting on the skateboarder. This can be obtained as illustrated below:
Force resistance (Fᵣ) = 55.2 N
Applied force (Fₐ) = 31.8 N
Net force (Fₙ) =?
Fₙ = Fᵣ – Fₐ
Fₙ = 55.2 – 31.8
Fₙ = 23.4 N to the left
Finally, we shall determine the acceleration of the skateboarder. This can be obtained as follow:
Mass (m) = 65.2 kg.
Net force (Fₙ) = 23.4 N to the left
Acceleration (a) =?
F = ma
23.4 = 65.2 × a
Divide both side by 65.2
a = 23.4 / 65.2
a = 0.36 m/s
Since the net force acting on the skateboarder is to the left. Therefore, the acceleration of the stakeholder will also be towards the left (i.e 0.36 m/s to the left)
Answer:
A. 0.36 m/s to the left
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