Explanation:
F=ma=(100kg)(4m/s/s)=400N
N is Newton, the SI unit of force, which is a kg•m/s/s. F is net force and, of course, m is mass and a is acceleration.
The net force acting on a 100kg man standing in an elevator accelerating downward with a=9.8 m/s^2 is d. zero
What is force?
Force is a push or pulls on an object that causes it to change its speed or direction.It is an external agent capable of changing the state of rest or motion of a body. It is a vector quantity so it has a magnitude and a direction.calculation force of a lift:-
net force,
Mg-F=Ma
100*9.8-F=100*9.8
F=100*9.8-100.9.8
F= 0
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please help on answer
Answer:
D. 1
Explanation:
I believe this is the answer
what is the conversion of energy in a lady teaching basic science in a class
Answer:
Energy transformation, also known as energy conversion, is the process of changing energy from one form to another
Explanation:
Question 2 of 10
Live footage is a:
O A. person who experiences a news event.
O B. professional who reports the news.
C. series of photos taken after an event.
D. video showing an event as it happens.
SUBMIT
PREVIOUS
Explanation:
A - Journalist
B - Journalist/News reporter
C - Photography/Paparazzi
D - Videography
How did Edwin Hubble's discovery that the Andromeda Nebula was at least 1 million light years away change scientists' view of the universe?.
After years of observation, Hubble made an extraordinary discovery. In 1923 he spotted a Cepheid variable star in what was known as the Andromeda Nebula. Using Leavitt's techniques, he was able to show that Andromeda was nearly 1 million light years away and clearly a galaxy in its own right, not a gas cloud.
What is probability of picking an orange marble and flipping a heads?
25%
40%
15%
30%
Answer:
15%
Explanation:
can someone please answer this, ill give you brainliest and your getting 100 points.
Answer:
I believe it's Pacific and Austrailian.
Explanation:
What's a. convergent boundary.
The place where two techtonic plates collides with each other .
Here the correct option is B
Pacific and AustraliaPrompt. Explain the difference between a solar eclipse and a lunar eclipse. Be sure to explain the positions of the earth moon and sun for each scenario
Answer:
Explanation:
Eclipse happens when a large object gets in the way of another object; casting its shadow over it.
Solar eclipse happens when the moon get in between the sun and earth. It blocks sun light and causes its shadow over the sun as seen from earth.
Lunar eclipse happens when the earth is in between the sun and moon. It blocks sun light from reflecting off the moon surface so there is a shadow on the moon as seen from earth.
7. A ball has mass of. 72 kg and is travelling at 19 m/s2 and its mechanical energy is 168 ). What is the potential energy of the ball?
O 33. 94 j
O 38. 04 j
O 129. 96
O 134. 6
Answer:
Explanation:
first find popotential energy
M.E=P.E+ K.E
K.E=1/2MV^2
K.E=1/2×72×261
K.E=9396
168=9396+P.E
P.e=-9228
Poor flexibility can result in __________.
A.
poor mobility
B.
injuries
C.
pain
D.
all of the above
Please select the best answer from the choices provided.
A
B
C
D
Mark this and return
Answer:
the answers would be D: all the above
is the rate at which ____________________ changes. (Velocity or Acceleration, velocity or acceleration)
Acceleration is the rate at which velocity changes.
In which does sound travel fastest? Question 8 options: solids liquids gases plasma.
Sound travels fastest in solids. A sound is a vibration that travels in a longitudinal direction through a medium in the form of a mechanical wave.
What is sound?A sound is a vibration that travels in a longitudinal direction through a medium in the form of a mechanical wave.
It can propagate through a solid, a liquid, or a gas as its medium. Solids go the fastest, liquids are slower, and gases are the slowest.
Sound travels the quickest through a solid because the molecules are packed together densely, allowing sound waves to leap from one molecule to the next more quickly.
Because the molecules in solids are packed the tightest, sound travels the quickest through them, whereas sound travels the slowest through gases.
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Answer:
solids
Explanation:
As kids, most of us went down the slide on a playground only to have to later deal with static electricality. Suppose the slide becomes positively charged after you slid down it
A. how did the slide become positively charged?
B.Where did those charges go?
Answer:
answer below, like if this helps please.
Explanation:
A. If the slide became positively charged then that means the boy gained electrons. electrons can only move therefore when something becomes charged positively it is because of the transfer electrons.
B. the electrons go to the boy causing the slide to have more protons then the electrons.
PLS HELP!!! WILL GIVE BRAINLIEST
Sanzida conducted an experiment that required a wire carrying a current to be wrapped around a metal core. When she placed the South Pole of a bar magnet near the top of the metal rod, she observed the magnet move toward the rod. Which conclusion can Sanzida draw from this experiment?
A) the current in the wire has created a gravitational field with its South Pole at the top of the rod
B) the current in the wire has created a magnetic field with its South Pole at the top of the rod.
C) the current in the wire has created a magnetic field with its North Pole at the top of the rod.
D) The current in the wire has created a gravitational field with its North Pole at the top of the rod
Answer:
did you ever get the answer
The current in the wire has created a magnetic field with its north pole at the top of the rod. This is because the magnetic field influences electric currents. Thus, the correct option is C.
What is a magnetic field?A magnetic field is a vector field which describes the magnetic influence on a moving electric charge, electric current, and magnetic material. A moving charge in a magnetic field which is experienced a force perpendicular to the own velocity and to the magnetic field.
The magnetic field is also referred to as the field where magnetic forces act to shape an electrical current. The only material or body which is capable of altering an electrical current in a magnetic field is the presence of another magnetic field in the space.
Therefore, the correct option is C.
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How many oz are in 9080 mg
Answer:
0.32028758 oz.
Explanation:
Formula: 9080 mg, divide the mass value by 28349.5231
Which equals it 0.32028758 oz.
Answer:
0.3202876 oz
Explanation:
for an approximate result, divide the mass value by 28350
What is the power of a machine that transfers 15,000J of energy in 1 minute?
Answer:
answer is 250 W
Explanation:
W=P * t
t=60s
W= 15000J
15000= P * 60
P= 15000/60
P= 250W. (SI unit of power Watt)
The power of a machine is the rate of energy or work done by the machine. The power for 15000 J of energy in 1 minute is 250 W.
What is power?Power is a physical quantity that describes the rate of work done or energy of on an object. The work done is a vector quantity having magnitude and direction. Whereas, power is a scalar quantity.
When a force applied on a body makes its displaced, the force is said to be done work on the body. When the body do work by a restoring force then work is said to done by the body.
Work done is the product of power and time.
Given that, work done = 15000 J
time = 1 minute = 60 s
power = 15000 J /60 s = 250 W.
Therefore, the power of the machine is 250 W.
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What symbol is in the middle of the chemical equation?
an equal sign
an arrow
Answer:
the answer is An Arrow
Magnets are similar to electrical charges because:
A) the like Poles of a magnet attract each other.
B) the force between both magnet and charges increase as they get further from one another.
C) the like poles of a magnet repel each other.
D) Magnets and electrical charges have no similarities.
Answer:
C
Explanation:
the reason is because both magnets and electric charges have both North and south poles
and like poles of both magnets and electric charges repel from eachother while unlike charge repel
pls give brainliest
At what degree is the Equator
located on the globe?
Answer:
0 degrees latitude
Explanation:
At 0 degrees latitude, the Equator is an invisible line that circles the Earth's center.
A body starts from rest and travels with uniform acceleration of 2 m/s², if its velocity is v after making a displacement of 9 m . Then find the value of v .
Question :-
A body starts from Rest and travels with Uniform Acceleration of 2 m/s². If its Velocity is v after making a Displacement of 9 m . Then find the value of 'v' .Answer :-
The value of Final Velocity is 6 m/s .[tex] \rule {180pt} {2pt} [/tex]
Given :-
Initial Velocity = 0 m/sAcceleration = 2 m/s²Displacement = 9 mTo Find :-
Final Velocity = ?Solution :-
As per the provided information in the given question, Initial Velocity is given 0 m/s . Acceleration is given 2 m/s² . Displacement is given 9 m . And, we have been asked to calculate the Final Velocity .
For calculating the Final Velocity , we will use 3ʳᵈ Equation of Motion :-
[tex] \sf {ᴠ ^{2} \: - \: ᴜ ^{2} \: = \: 2 \: ᴀs} [/tex]Where ,
ᴠ² denotes to the Final Velocity ᴜ² denotes to the Initial Velocityᴀ denotes to the Accelerations denotes to the DisplacementTherefore , by Substituting the given values in the above Equation :-
[tex] \longmapsto \: \: \sf {ᴠ ^{2} \: - \: ᴜ ^{2} \: = \: 2 \: \times \: ᴀ \: \times \: s} [/tex]
[tex] \longmapsto \: \: \sf {ᴠ ^{2} \: - \: 0 \: = \: 2 \: \times \: 2 \: \times \: 9} [/tex]
[tex] \longmapsto \: \: \sf {ᴠ ^{2} \: - \: 0 \: = \: 36} [/tex]
[tex] \longmapsto \: \: \sf {ᴠ ^{2} \: = \: 36} [/tex]
[tex] \longmapsto \: \: \sf {ᴠ \: = \: \sqrt { \: 36 \: }} [/tex]
[tex] \longmapsto \: \: \textbf {\textsf {ᴠ \: = \: 6}} [/tex]
Hence :-
Final Velocity = 6 m/s .[tex] \underline {\rule {180pt} {4pt}} [/tex]
Suppose you are playing pool with a friend. The white cue ball
travels 10 m/s toward the black eight-ball, which is at rest. After
they collide, the cue ball is at rest and the eight-ball is moving.
Both have a mass of 0.16 kg. How fast is the eight-ball moving?
m/s
Answer:
10 m/s
Explanation:
u of cue ball = 10 m/s
u of eight ball=0m/s
m of cue ball =0.16 kg
m of eight ball =0.16 kg
According to law of conservation of momentum
Momentum before collision = Momentum after collision
so
( m of cue ball X velocity of cue ball) + ( m of eight ball X velocity of eight ball)= (m of cue ball X velocity of cue ball after collision )+( m of eight ball X velocity of eight ball after collision)
thus
(0.16 X 10)+(.016 X 0)= (0.16 X 0)+ ( 0.16 X velocity of eight ball after collision)
1.6= 0.16 X velocity of eight ball after collision
1.6÷0.16= velocity of ball after collision
10= velocity of eight ball after collision
Density of solids What is your hypothesis (or hypotheses) for this experiment?.
I formulate a hypothesis based on their observations about what occurs when both the rock and the wood are submerged in water.
What is density?Density is defined as the mass per unit volume. It is an important parameter in order to understand the fluid and its properties. Its unit is kg/m³.
The mass and density relation is given as
mass = density × volume
I study if the volume or density of items determines whether solid objects float or sink in water in this scientific inquiry I did the experiment of density, mass, and volume using a rock and a standard-shaped piece of wood.
It is critical that the chosen piece of wood is larger than the rock and that the rock be tiny enough to fit inside the measuring cylinder. I see both the rock and a chunk of wood.
Hence I formulate a hypothesis based on their observations about what occurs when both the rock and the wood are submerged in water.
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You are moving 6 books, each weighing 11 N, to a shelf 0. 8 m higher. Do you do more work by moving all 6 books at once, or by moving one book at a time?
Answer:
word done = fore * distance moved by the force, so 11n * 0.8=8.8j then 8.8 * 6=52.8j
but all the books at ones means, 6*11=66N
and 66*0.8 = 52.8j
Explanation:
The work done is equal..
Name THREE things that impact a collision.
Answer:
The three types of impact that occur are those involving the vehicle, the body of the vehicle occupant, and the organs within the body of the occupant.
Is my answer correct? Please i need to know
Answer: its D
Explanation:
because the car is pulling it(trailer) to the left not the right
How to solve it? Plssss
Answer:
T1 + T2 cos 60 = 1000 cos 15 balancing x-forces
T1 + T2 / 2 = 966 (I)
1000 sin 15 + .866 T2 = 1200 balancing y-forces
259 + .866 T2 = 1200
T2 = 941 / .866 = 1087 value for T2
T1 + 543 = 966 using equation (I)
T1 = 423
A relaxed spring of length 0. 13 m stands vertically on the floor; its stiffness is 1180 N/m. You release a block of mass 0. 5 kg from rest, with the bottom of the block 0. 7 m above the floor and straight above the spring. How long is the spring when the block comes momentarily to rest on the compressed spring?.
The length of spring when the block comes momentarily to rest on the compressed spring will be 0.054 m.The length of the spring by the letter x.
What is the potential energy of the spring?The energy is stored in the spring when it is stretched or compressed by some length. It is the product of mass, gravity and distance compressed or stretched. Mathrmatically it is given by;
PE=mgh
The given data in the problem is ;
m is the mass of the block is 0.5 kg height,
h is the height is released is 0.7 m
x initial length of the spring = 0.13 m.
K is the force constant of the spring = 1180 N/m.
By the law of conservation of energy,
The potential energy of the spring gets converted
[tex]\rm mgh=\frac{1}{2}KL^2 \\\\ \rm L= \sqrt{\frac{2mgh}{K} } \\\\ \rm L= \sqrt{\frac{2\times 0.5\times9.81 \times 0.7}{1180} \\\\ \\\\[/tex]
[tex]\rm L= 0.054m[/tex]
Hence the length of spring when the block comes momentarily to rest on the compressed spring will be 0.054 m
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explain why plastic comb rubbed with wool attracts pieces of paper
Answer:
Static electricity
Explanation:
Opposite charges attract each other.
Two learners want to confirm the principle of conservation of momentum for an isolated system. Two trolleys, with identical dimensions, but masses m and 1/2m, with a spring- loaded plunger between them, are placed on a horizontal surface. When the spring is released, it takes trolley X only 0.5 s to reach the barrier, which is 100 mm away. Trolley Y takes the same time to cover 200 mm to the other barrier.
1. Calculate the average speeds of trolleys X and Y respectively.
2 Calculate the total momentum after the release of the spring.
Based on the principle of conservation of momentum;
average speed of A is 0.2 m/saverage speed of B is 0.4 m/sthe total momentum after the release of the spring is zero.What is the principle of conservation of momentum?The principle of conservation of momentum states that in an isolated system of colliding bodies, momentum is conserved.
This principle can be stated mathematically as:
momentum before collision = momentum after collision.The average speed of each trolley is calculated using the formula:
average speed = total distance/total time takenFor Trolley A:
average speed = 100 mm/0.5 = 200 mm/s
average speed of A = 0.2 m/s
For Trolley B:
distance = 200 mm = 0.2 m
average speed = 0.2 m/0.5 s
average speed of B = 0.4 m/s
Momentum = mass × velocity
Assuming direction of motion of B is positive, direction of A is negative
Momentum of A = - m × 0.2 = -0.2m
Momentum of B = m/2 × 0.4 = 0.2 m
Total momentum = 0.2 m - 0.2 = 0
Therefore, the total momentum before and after the release of the spring is zero.
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When a positively charged object is brought close to 2 metal spheres that are touching, what will happen to the electrons in the spheres?.
Answer:
Let's assume the metal spheres are solid metal, and not charged beforehand.
The premise are similar, but the effect changes depending if you are approching from the side, between the spheres (left image) or the front (right image). Let's image the charged object is the tip of the arrow in the drawing, and it's small enough to be considered a point
In either case, the electron cloud in the spheres will be affected by the electric field generated by the charge, and gets attracted towards it (since the charge is positive and the electrons have by definition negative charge), moving according to the blue lines. For as long as the charge is in place, the "grouping" of charges on one side and the absence of charges on the other will create an electric dipole with the positive charge away from the side the arrived and the negative on the opposite end of the diameter.
The interesting part happens the moment you split the two spheres.
In the left case will realign based on the field lines (remember that a single charge will generate a radial field) and the moment you remove the charge the electrons are no longer drawn to one end, and will eventually re-distribute on the whole sphere, canceling the dipole.
In the right case instead, the fact that the spheres were touching allows the electrons in one of the sphere to migrate to the other, generating a net positive charge in the far sphere, and a net negative charge in the close one. if you separate the two spheres before removing the charge, the electrons are still "trapped" in the leftmost sphere, thus keeping it charged even after the original source is removed from the system.
Hello everyone I would like your help on this exercise because the physics I have a little difficulty. Here is the statement:
A child launches a blue cart of mass m= 150 g in A of altitude zA= 0 on an inclined plane of an angle α = 30° with respect to the horizontal. The cart then climbs to point C where it stops before descending in reverse. This blue cart is not subject to any frictional force between A and C.
1°-What are the forces acting on the car during its journey from A to C ?
2°-What can we say about the mechanical energy of the car? Why?
3°-Determine the velocity vA with which the child launches the cart in Asknowing that the point C is at the altitude zC= 0,80 m
The child then launches a red cart of the same mass as the blue one with a speed of 4.0 m/s. This car reaches only a height of 0.55 m.
4°-Show that the mechanical energy for this red car is not conserved.
5°-Assuming that the frictional force exerted on this car during all its journey is constant, calculate the work of this force noted f.
6°-Determine then the value of f.
Data: Gravity field: g= 9,81 N/kg
Answer:
Fn = m g cos 30 = .15 * 9.81 * .866 = 1.27 N force of plane on car
Fp = m g sin 30 = .15 * 9.81 * 1/2 = .736 N force along plane
m g h = W = potential energy of car = original mechanical energy
1/2 m v^2 = m g h equating PE and KE
v^2 = 2 g h = 2 * 9.81 * .8
v = 3.96 m/s original speed of blue cart
Launch energy of red cart
1/2 m v^2 = .15 / 2 * 16 = 1.2 J launch energy of red cart
m g h = .15 * 9.81 * .55 = .81 J potential energy of red cart
Wf = (1.2 -.81) J = .39 J work done against friction