Answer:
How long or wide something is
Explanation:
Can some one help me with this question its hard :( down below ill give brainliest
Calculate the work done by a 4.2 N force pushing a 450. g sandwich across a table 0.8 m wide.
Answer:
3.36 Joules
Explanation:
Work done= Force × distance
F=4.2 N
distance= 0.8 m
work done= 4.2 × 0.8
work done= 3.36 Joules
Think of Rutherford's experiment. Most alpha particles passed straight through, but a few were repelled so strongly that they were bounced back or deflected at large angles. This led Rutherford to conclude that the charge of the nucleus of an atom must be... what?
Answer:
Rutherford considered these observations and he concluded: The fact that most alpha particles went straight through the foil is evidence for the atom being mostly empty space. A small number of alpha particles being deflected at large angles suggested that there is a concentration of positive charge in the atom.
Hope it helps
Most alpha particles passed straight through, but a few were repelled so strongly that they were bounced back or deflected at large angles. This led Rutherford to conclude that the charge of the nucleus of an atom must be positive.
What are atomic models?There are some models that are used to explain the arrangements of subatomic particles inside the atom based on the atomic theory of atoms known as the atomic models.
As given in the problem statement Think of Rutherford's experiment. Most alpha particles passed straight through, but a few were repelled so strongly that they were bounced back or deflected at large angles.
Most alpha particles were resisted so strongly that they were bounced back or deflected at huge angles, but a handful did not.
Hence, Rutherford came to the conclusion that an atom's nucleus must have a positive charge as a result of this.
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two parallel plates of area 5.68*10^-4 m^2 have equal and opposite charges of 8.38*10^-11 C placed on them. what is the electric field between the plates
Answer: unit n/c
Explanation: This should be the answer because I just asked my Physics Teachers I hope this is correct
Hope This Helps :)
The electric field between the plates will be 0.1667×10⁵ C.
What is an electric field?An electric field is an electric property that is connected with any location in space where a charge exists in any form. The electric force per unit charge is another term for an electric field.
The electric field formula is as follows:
E = F /Q
Where,
The electric field is denoted by the letter E.
F is Electric force
The charge is Q.
Given data;
Q (Charge)= 8.38 × 10¯¹¹ C ,
A (Area between the plates) = 5.68 × 10¯⁴ m²,
ε₀(permeability constant) = 8.85 × 10¯¹² C²/Nm²
[tex]\rm E= \frac{Q}{K \epsilon_0 } \\\\ \rm E= \frac{8.38 \times 10^{-11}}{5.68 \times 10^{-4} \times 8.85 \times 10^{-12} } \\\\ E= 0.1667 \times 10^5 \ N C^{-1}[/tex]
Hence,the electric field between the plates will be 0.1667×10⁵ C.
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A 2.2kg block of ice slides across a rough floor. Its initial velocity is 2.5m/s and its final velocity is 0.50m/s. How much of the ice block melted as a result of the work done by friction? (Latent Heat of water is 3.3*10^5J/kg)
Answer:A 2.2kg block of ice slides across a rough floor. Its initial velocity is 2.5m/s and its final velocity is 0.50m/s. How much of the ice block melted as a result of the work done by friction? (Latent Heat of water is 3.3*10^5J/kg)
Explanation:
The heat produced by friction between a skate and the ice during movement over the surface melts the topmost layer of ice. However, even when you are still, ice is still slick. When you remain still on ice, there is no friction to produce heat, but the ice is still slippery.
What ice melted as a result of the work done by friction?Although friction does generate heat, the amount of heat it produces is insufficient to melt ice that is at a very low temperature. But even at low temperatures, ice still creates a slick liquid layer. The formation of a slippery coating even when the item is totally still cannot be explained by frictional heating.
Therefore, A rough floor is traversed by a 2.2 kg lump of ice. It moves at a final speed of 0.50 m/s after starting out at 2.5 m/s. What portion of the ice block melted as a result of the friction's work? (Water has a latent heat of 3.3×105 J/kg.)
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A circuit has an overall resistance of 40 ohms and a current of 200mA.
What is the potential difference in this circuit?
Answer:
Hey!
_________________
Voltage (V) = 0.8V
Current (I) = 200 mA = 200/10^3 = 2/10
Resistance = ?
Resistance = Voltage / Current
Voltage = Current × Resistance
0.8 = 2/10 × Resistance
0.8×10/2 = Resistance
8/2 = Resistance
Resistance = 4 ohm
_________________
Hope it helps...!!!
Explanation:
Model A: Two sponge balls representing two atoms are soaked in water. You hold one ball, and your friend holds the other. Then you press the two balls together. As you press them together, water leaks out. What type of reaction does this model represent?
:) thnx, please don't just answer for points
Answer:
The type of reaction represented by the model is an;
Exothermic reaction
Explanation:
Exothermic reaction reaction is a reaction that involves the giving off of excess energy as heat and or light by two or more reactants during a chemical reaction due to the higher combined energy of the reactants compared with the product
The analogy are;
The sponge balls are the reacting atoms
The water is the energy which they contain
The water given off is the excess energy which the compound formed by putting together the two soaked sponge balls is unable to hold.
If a plane traveling down a runway at 75 m/s accelerates at a rate of 8 m/s’over
40 seconds, then what is its final velocity?
Answer:
395 m/s
Explanation:
Initial velocity (u) = 75 m/sAcceleration (a) = 8 m/s²Time taken (t) = 40 secondsBy using the first equation of motion,
❖ v = u + atv denotes final velocityu denotes initial velocitya denotes accelerationt denotes time→ v = 75 + 8(40)
→ v = 75 + 320
→ v = 395
→ Final velocity = 395 m/sHelp please thank you
Answer:
A. 1 unit
B. 5 units
C. 8 units
Explanation:
Count the lines from each starting point to each destination.
A girl of mass 30.0 kg is on a roundabout of radius 5.0 m that makes one complete turn every 5.0 seconds.
What is the centripetal force acting on her?
Answer:
7
Explanation:
this is a test a b c d e f g h i j k l m n o p
Answer:
???????????????????????????????????????
Explanation:
Answer:
q r s t u v w x y z
Explanation:
a car travels at 90 km per hour how much distance in metre does the car travel in 25 seconds
Answer:
90000m÷3600s=25m25m×25s=625msthe electric cell of internal resistance 0.5ohms delivers a current of 2 amperes when a resistance of 3 ohm is connected across it, find the electromotive force of the cell. Show all workings
Answer:
7 volts
Explanation:
Applying,
E = IR+Ir................ Equation 1
Where E = electromotive force of the cell, I = current. R = External resistance, r = internal resistance.
From the question,
Given: I = 2 amperes, R = 3 ohm, r = 0.5 ohm
Substitute these values into equation 1
E = (2×3)+(2×0.5)
E = 6+1
E = 7 volts
can someone help with the blank questions please?
5. A new technique called adaptive optics allows astronomers to: a. change the eyepieces of their telescopes much more quickly than ever before b. compensate for changes in the Earth's atmosphere and achieve better resolution c. increase the aperture of their telescopes by connecting several telescopes d. change the region of the electro-magnetic spectrum in which their telescope is able to detect radiation e. use the observatory shop to make better eye-glasses for their graduate students
Answer:
b. compensate for changes in the Earth's atmosphere and achieve better resolution.
Explanation:
The adaptive optic is a technology that is used to enhance the application of optical system in reducing the impact from the incoming distractions. It is dine to reduce the optical abbrebrivation. It is also used for correcting the tip-tilt correction by using the segmented mirrors.PLS HELP ME ANSWER THESE 2 QUESTIONS lol
Answer:
a) Yes, this is kinda the best way to split the teams.
b) Force (or acceleration, these are proportional)
Explanation:
For both questions, we should start with the second Newton's law.
This law can be written as:
F = m*a
force equals mass times acceleration.
a) For the case of the rope, the ideal situation is having almost the same mass in both ends of the rope, in this way, the relation between force and acceleration in each end will be equivalent. (while one could argue that 3 smaller people will actually have a larger mass than the two bigger ones) but yes, this way is a good way to split the teams, so the mass is as even as possible.
b) Acceleration is defined as the rate of change of the velocity.
Again, by the above equation:
F = m*a
We need to have a force if we want to have acceleration.
Then, if an object has constant velocity (if the object is at a full stop, then it has a constant velocity of 0 m/s) we need to apply a force to this object if we want to change its motion.
Similarly, if an object is accelerating, we can apply a force to the object in order to cancel that acceleration (if the net force applied in the object is zero, then the acceleration is zero)
So here we can conclude that a force is what causes an object to change its motion.
Help!!!!
Which locations would be considered a target hazard?
mailbox unit on a highway
city baseball field
bus or train station
neighborhood playground
Answer:bus or train station is the answer of your question
hope it is helpful to you
Most consumers first spend their disposable income on what
Answer:
They first spend it on necessities.
State one similarity between rotatory and circular motion
Answer:
The main difference between these types of motion is that circular motion is a special case of rotational motion, where the distance between the body’s centre of mass and the axis of rotation remains fixed.
Rotational motion is based around the idea of rotation of a body about its center of mass. In rotational motion, the axis of rotation and centre of mass could change whereas in circular motion, the axis of rotation and centre of mass does not change.
Circular motion is a movement of an object along the circumference of a circle or rotation along a circular path and can either have a constant angular rotation rate and constant speed, or it can exist with a changing rate of rotation.
Think of one of those fairground rides where people sit on dummy horses. Now imagine the horses spin around the post that holds them to the base of the ride. Then you have both rotational motion of the horse and circular motion as the horses move around the ride.
How can light be both a wave and a particle? What does that mean?
Answer:
Explanation:
Quantum mechanics tells us that light can behave simultaneously as a particle or a wave. However, there has never been an experiment able to capture both natures of light at the same time; the closest we have come is seeing either wave or particle, but always at different times.When UV light hits a metal surface, it causes an emission of electrons. Albert Einstein explained this "photoelectric" effect by proposing that light – thought to only be a wave – is also a stream of particles
Why is light considered a wave and a particle?
Light behaves mainly like a wave but it can also be considered to consist of tiny packages of energy called photons. Photons carry a fixed amount of energy but have no mass. They also found that increasing the intensity of light increased the number of electrons ejected, but not their speed
Which equation is true of an atom with no elctrical charge
A. Number of nutrons = number of protons
B. Number of electrons = number of neutrons
C. Number of neutrons = number of protons + number of electrons
D. Number of electrons = number of protons
Answer:
Atoms are composed of electrons (charge -1), protons (charge +1), and neutrons (no charge). So in a neutral atom the correct answer is "D".
Two charges create 8.00 N of electric
force on each other. If you increase
their distance to twice its original
value, how much electric force do
they exert on each other?
(Hint: How does Fe change with distance?)
[?]N
Answer:
2.00 (right on acellus)
Explanation:
doubling the distance between two charges makes F (8.00) quarter, so you would just do 8.00*1/4.
Photo below with question, please help need to confirm answer
Is the answer A?
Answer:
Only circuit A will contain to lit bulbs
A 10 kg sled is sliding down a hill at 5 m/s what is the Kinetic energy of the sled
Answer:
Explanation:
kinetic energy=1/2*mass*(velocity)^2
=1/2*10*(5)^2
=5*25
=125 joule
_______ is in continuous motion in _____, spinning as it moves around the _______. Fill in the blank..
Answer: Earth is in a continuous motion in space, spinning as it moves around the sun.
(Hope this helped!)
Answer:
motion in space and moves around the sun
Explanation:
I hope this helps
Which statement should she place in the region marked X?
A. Electrons move between objects.
B. The objects do not touch.
C. The objects develop opposite charges.
D. The objects have the same charge.
Electrons moving between objects should be place in the region marked X. So, option A.
What is meant by charge ?When a substance is exposed to an electric or magnetic field, it has a characteristic known as charge that makes it experience a force. Neither a positive nor a negative charge exists.
Here,
Normally, electrons are organized into specific shells that maintain a constant distance from the atom's nucleus.
Two electrons can fit inside of the shell that is closest to the nucleus. Up to eight can fit inside the following shell. The number of electron shells in some atoms with numerous protons can reach seven.
A powerful force of attraction exists between the protons and the electrons in the shells that are closest to the nucleus.
In the outermost shells of certain atoms, the protons are sometimes attracted to the electrons with little force.
One can force these electrons out of their orbits. They may switch from one atom to another by applying a force. Electricity is produced by the changing electrons.
Hence,
Electrons moving between objects should be place in the region marked X. So, option A.
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A spring has 100 J of EPE when it is stretched 2 m. What is the spring constant?
A. 100 N/m
B. 50 N/m
C. 200 N/m
D. 150 N/m
Answer:
B: 50 N/m
Explanation:
Hopes it help.
The spring constant of the spring is 50 N/m. The correct option is B.
What is spring potential energy?When the spring is compressed, it gets compressed up to its elastic limit. When load is removed from the spring, it regains its shape and obtains equilibrium position. The energy stored in this process is called as spring potential energy.
Given a spring has 100 J of EPE when it is stretched 2 m. The energy stored in the spring is given by
SPE = ½ kx²
100 = ½ k (2 m)²
k = 50 N/m
So, spring constant of the spring is 50 N/m.
Thus, the correct option is B.
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A.149 kg baseball moving at 17.7 m/s is caught by a 57 kg catcher at rest on an ice skating rink, wearing
frictionless skates. With what speed does the catcher slide on the ice?
Do NOT put in units or it will be marked wrong! The answer's value only! Please round each answer to 3 places.
MaVa + MbVb = (Ma+b)(Va+b)
Answer:
v = 12.8 m/s
Explanation:
Applying the law of conservation of energy:
[tex]m_1u_1+m_2u_2=m_1v_1+m_2v_2[/tex]
where,
m₁ = mass of baseball = 149 kg
m₂ = mass of catcher = 57 kg
u₁ = initial speed of ball = 17.7 m/s
u₂ = initial speed of catcher = 0 m/s
v₁ = v₂ = v = final speed of ball and the final speed of catcher = ?
both are same because ball is in hands of cathcer in the final state.
Therefore,
[tex](149\ kg)(17.7\ m/s)+(57\ kg)(0\ m/s)=(149\ kg)(v)+(57\ kg)(v)\\\\v = \frac{2637.3\ kgm/s}{206\ kg}[/tex]
v = 12.8 m/s
True or False: Elements can unite chemically to form compounds.
Answer:
True
Explanation:
When two distinct elements are chemically combined—i.e., chemical bonds form between their atoms—the result is called a chemical compound. Most elements on Earth bond with other elements to form chemical compounds, such as sodium (Na) and Chloride (Cl), which combine to form table salt (NaCl).
Hope this helps!!
Which organs are involved in the process of delivering the digestive juices for the intestines?
Stomach
Esophagus
Gall Bladder
Liver
Pancreas
Answer:
The Liver, Pancreas and Gall Bladder are involved in the process of delivering the digestive juices for the Intestines
Explanation: