what is the difference between true north and magnetic north called?
true North is fixed point on the globe
magnetic North is the direction that a compass needle points to as it aligns with the earths magnetic field and what is interesting is that the magnetic North pole shifts and changes over time in response to change in the earth's magnetic core
Four different blocks are resting on the floor. They each have a different mass, and they are each made of a different material, so the coefficients of friction are not the same. Using the information in the table below, rank, from highest to lowest, the magnitude of the maximum horizontal force
To answer this question, it is necessary to apply the static condition from Newton´s Laws
The solution is:
Fd > Fc > Fa > Fb
From the body free diagram, and from the second Newton´s law of movement we get:
∑ Fx = 0 F - Fr = 0 F = Fr Fr = μ×N
∑ Fy = 0 N = m×g ⇒ Therefore Fr = μ×m×g
F = μ×m×g g is the same in all the cases, then we just compare the products μ×m
So when F is just greater than Fr, the body will start moving
we make a table, with values from the information table.
1.- μ×m = 0.5× 40 = 20
2.-μ×m = 0.4× 80 = 16
3.- μ×m = 0.7× 30 = 21
4.- μ×m = 0.9× 35 = 31.5
According to the table, from highest to lowest the magnitude of the horizontal force is:
Fd > Fc > Fa > Fb
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what is magnetic force?
i
Answer:
The force by which a substance (magnet) attracts a body(metals) towards it is called magnetic force
Answer:
Magnetic force, attraction or repulsion that arises between electrically charged particles because of their motion. The magnetic force between two moving charges may be described as the effect exerted upon either charge by a magnetic field created by the other.
Explanation:
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In which of the following cases of motions, the distance moved and the magnitude of the displacement are equal?
If the car is moving on a straight road
If the car is moving in circular path
The pendulum is moving to and fro
The earth is moving around the sun
Answer:
answer is number (a) If the car is moving on a straight road....
Explanation:
The distance moved and magnitude of displacement are equal only in the case of motion along a straight line. Because displacement is the shortest path between initial and find path. So, for car moving on straight road, distance moved and magnitude of displacement are equal.
Define the words offense and defense in flag football
Answer: I believe offense is the attacking team and defense is the defending team
Source: I just peeked at dad watching football
sometimes when a chemical change ----------- occurs of a substance will change
shape
color
size
mass
Answer:
Chemical changes occur when a substance combines with another to form
Explanation:
Chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. These processes are called chemical reactions and, in general, are not reversible except by further chemical reactions.
A cat falls from a table of height 1.3 m. What is the impact speed of the cat?
O A. 7.5 m/s
O B. 2.5 m/s
O C. 5.0 m/s
O D. 25.5 m/s
SUBMIT
The impact speed will be
v^2 = 2*9.8*1.3
v^2 = 25.48
v= 5.04 m/s or O C. 5.0 m/s
one sports where it would be good to have long thick bones , explain your answer
Answer:
Marathon/Long distance running, swimming, etc
The brakes are slammed on a speeding truck and it skids to a stop. If the truck were heavily loaded so it had twice the total mass, the skidding distance would be...
A) the same
B) one and one-half times as far
C) twice as far
D) four times as far
Explain your answer
Answer:
twice more but I have to make it 20 characters so h8 how u doing I hear yelling outside my room and exstasional dread in my head
If the mass of the truck is doubled, the force of friction is doubled, and the skidding distance is doubled.
Hence, the correct option is C.
The skidding distance is proportional to the mass of the truck. If the truck is heavily loaded so it has twice the total mass, the skidding distance will be twice as far.
This is because the force of friction is proportional to the normal force, which is in turn proportional to the mass of the truck. The greater the mass of the truck, the greater the force of friction, and the longer the skidding distance.
In equation form, the skidding distance is given by:
s = μ * d / f
where:
s is the skidding distance
μ is the coefficient of friction
d is the distance traveled before the truck stops
f is the force of friction
The force of friction is given by:
f = μ * mg
where:
m is the mass of the truck
g is the acceleration due to gravity
Therefore, If the mass of the truck is doubled, the force of friction is doubled, and the skidding distance is doubled.
Hence, the correct option is C.
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why do we need to know physical and chemical change?
It is important to understand the differences between physical and chemical changes. ... It helps to think of physical changes as those involving changes that don't change the make up of the substance, while chemical changes are those that create a new substance. Physical Changes involve energy.
What resistance does a 25 W light bulb have if 12.6 V is applied to it?
(3 marks)
Answer:
Explanation:
W = 25 Watts
V = 12.6 Volts
I = ? I is the current in amperes.
Solution
25 = 12.6 * I
I = 25 / 12.6
I = 1.98 amperes
V = 12.6
I = 1.98
R = ??
V = I * R
12.6 = 1.98 * R
R = 12.6 / 1.98
R = 6.35 ohms
Describe how energy is transferred in one of the sequences.
Answer:
Energy transfer describes the changes in energy (a state function) that occur between organisms within an ecosystem. ... A food chain is a sequence of organisms that are connected by their feeding and productivity relationships; a food web is the interconnected set of many food chains. Energy transfer is a one-way process.
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15. What is velocity, and how is it useful for describing an object's motion?
Velocity describes motion by indicating how fastan object moves and in what direction. Speed is a magnitude of velocity, which indicates only how fast an object moves. Speed shows how much distance is traversed in a given interval of time: In a general case of motion,.
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Which factors below will increase the momentum of a rolling ball of constant mass m? (Select only the answers that will increase the momentum of the ball.) Moving from a flat surface to moving downhill. Colliding with a ball of much lower mass moving in the opposite direction of the ball. A moving object traveling in the same direction as the ball colliding with it. Rolling uphill onto an inclined surface. Rolling onto a surface with high amounts of friction with the ball.
In order to increase the momentum of the ball, you have to increase its speed.
The first and third choices on the list ('A' and 'C') will do that.
The factors that will increase momentum of a rolling ball are:
A. Moving from a flat surface to moving downhill.
C. A moving object traveling in the same direction as the ball colliding with it.
Factors that increase momentum:The gravitational power of the Earth ready makes the ball speed up, and in this manner pick up speed.
If you increase either mass or velocity, the momentum of the object increases proportionally.
Thus, the factors that increase the momentum of a rolling ball are
A. Moving from a flat surface to moving downhill.
C. A moving object traveling in the same direction as the ball colliding with it.
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Freud was an influential and controversial psychologist who believed that psychology should study the unconscious mind. Describe
the two books Freud published in the early 1900s. (Site 2)
Answer:
The Interpretation of Dreams": Freud noticed that dreams played an important role in his analysis of neurotic and "hysterical" patients. When he asked his patients to talk about whatever came into their minds, they often referred to their dreams, which would set off other associations and often illuminate other important connections in their past experience. It took Freud about two years to write the book, finishing it in September 1897.
How is air resistance similar to gravity? give me two reasons
Explanation:
I think this would help you. Read this and make your own answer ok.
What is the initial velocity of a moose who
accelerates uniformly at 1.5 m/s/s for 5 seconds and
finishes with a velocity of 7 m/s?
Answer:
- 0.5 m/s
Explanation:
(1) Acceleration = change in velocity / time
(2) Change in velocity = (Final velocity - Initial velocity)
We know:
acceleration = 1.5 m/s/s
time = 5 seconds
final velocity = 7 m/s
x = initial velocity)
1.5 = ( 7 - x ) / 5
1.5 x 5 = ( 7 - x )
7.5 = 7 - x
x = -0.5 m/s
You can check the answer by plugging in the values to equation (1).
Helicopter rescue winch-men must dangle a metal wire below them so that it always touches the ground or water surface first. This discharges __________ __________ that may have built up on the helicopter. What two words complete the sentence?
Answer:
static electricity
Helicopter rescue winch-men must dangle a metal wire below them so that it always touches the ground or water surface first. This discharges static electricity that may have built upon the helicopter.
What is static electricity?Static electricity is a familiar electric phenomenon in which charged particles are transferred from one body to another. For example, if two objects are rubbed together, especially if the objects are insulators and the surrounding air is dry, the objects acquire equal and opposite charges.
What is static electricity caused by?Static electricity is generated by friction between two insulating materials. When the materials are rubbed together, electrons are removed from atoms within the materials, giving rise to a static electric charge.
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In Greenland there is a glacier called the Jakobshavn Isbrae that moves more quickly than any other
glacier known to mankind. It travels 8.2 millimeters every day. How far does the glacier move in a YEAR?
Convert units and show your work. (HINT-> how many days are there in a year? How many millimeters
in a meter?)
Answer:
8.2 mm / day * 1 m / 1000 mm = .00082 m / day distance in 1 day
365 day / 1 yr * .00082 m / day = .30 m / yr
What is the final monetum of the artist clay system immediately after the collision
Answer:
the total mass of the objects multiplied by their velocity.
I know that the answer is 20, but I don’t know if it’s B or D. Please help
No links
Answer:
d makes the most sense sorry if it is wrong
what is another name for the magnitude of the velocity vector
Answer:dddddddddddddddddddd
Explanation:
42. The object in the figure is made of
a material of density 3000 kg/m3.
What is the tension in the rope,
which suspends the object, when
it is completely immersed in
water. The mass of the object is
200 kg.
TO?
Answerpov:
Explanation:
Volcanic Island Arcs, such as Japan, form when a(n) __________ plate is subducted below a(n) _________________ and takes seawater with it. A rock and water mixture will break through the crust.
Volcanic Island arcs form when an oceanic tectonic plate is subducted below a tectonic plate taking seawater with it.
Volcanic island arcs occur offshore during volcanoes. They occur due to the subduction of an oceanic plate under another tectonic plate. Volcanic Island arcs occur mostly in ocean basins.
Due to the subduction of oceanic plates under tectonic plates, Island Arcs are found, mostly along the margins of continent.
Hence we can conclude that Volcanic Island arcs Form when an oceanic tectonic plate is subducted below a tectonic plate taking seawater with it.
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Sound is caused by:
Air
Electricity
Force
Vibrations
sound is caused by vibrations
Answer:
Vibrations
Explanation:
Sounds are produced by vibrations.
Sound travels as waves, which in turn create other particles to vibrate creating vibrating particles and change sound.
Sound waves are reflected by surfaces.
A pugdoodle runs 120 meters
in 18 seconds. What was its
speed?
Answer:
6.66666 sec/m or 6 2/3 sec/m
Answer:
6.67 meters per second
Explanation:
120/18=6.67 meters per second
a. They are measured from the Prime Meridian in a and direction. These lines are known also as
Answer:
meridians
Imaginary lines called meridians that measure distances East and West of the Prime Meridian. Longitude is different from latitude. Longitude may also be referred to as meridians. Although they measure the distance from East and West, the lines run in the direction of north and south.
Explanation:
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The table describes the properties of four compounds.
Which compounds are most likely ionic?
compounds A and B
compounds B and C
compounds C and D
compounds D and A
The characteristics of the ionic bonds allows to find the results for the question about which compound are ionic is:
d) Compounds D and A.
Chemical compounds are formed by atoms linked by electrostatic forces, where one of the elements gave up some electrons and the other element acquired these electrons, the two atoms being in an ionic state, consequently the bond is strong and has several characteristics:
High melting point. It dissolves in polar solvent (water). In general they are hard and brittle solids (NaCl). In solution they are conductors of electricity.
In these characteristics, let's analyze the compounds in the table.
With the property of high melting point the compounds A and D can be ionic. According to the dissolution property all could be ionic. According to the conduction property of electricity, compounds A and D can be ionic
Let's review the different alternatives:
a) False. Compound A and B has a low melting point.
b) False. The B and C compounds have low melting points.
c) False. Compound C has a low melting point.
d) True. The two compounds meet all the characteristics of ionic compounds.
In conclusion with the characteristics of the ionic bonds we can find the results for the question about which compound are ionic is:
d) Compounds D and A are ionics.
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Newton's second law of motion gives the .............
definition of force
unit of force
nature of force
none of the above
Answer:
definition of force
Explanation:
It states that "the rate of change in momentum is proprtional to the force applied"
[tex]{ \rm{momentum = mass \times velocity}} \\ [/tex]
• from the law stated:
[tex]{ \rm{ \frac{ \delta momentum}{time} = force}} \\ \\ { \rm{ \frac{mv - mu}{time} = force}} \\ \\ { \rm{ \frac{mass(v - u)}{time} = force}} \\ \\ { \rm{mass \times \frac{(v - u)}{time} = force }}[/tex]
• from first newton equation:
[tex]{ \boxed{ \tt{ \frac{v - u}{t} = acceleration}}} \\ [/tex]
• therefore
[tex]{ \rm{mass \times acceleration = force}} \\ \\ { \boxed{ \rm{force = mass \times acceleration}}}[/tex]
v is final velocityu is initial velocityt is time