Answer:
The present day model shows a nucleus composed of protons and neutrons with cloud-like spheres of different diameters surrounding the nucleus to represent the energy levels of the electrons in the atom. Rutherford's model shows electrons orbiting the nucleus along fixed, but similar- diameter circular paths.
Both models show the composition of the nucleus at the center of the atom and the much smaller electrons at some distance from the nucleus.
Explanation:
Neither of the models does a good job of representing the relative size differences of the protons, neutrons and electrons, or the distance between the nucleus and the "electron clouds."
Sound waves are:
O Longitudinal Waves
O Transverse Waves
Can anyone answer my questions that I've asked?
Answer:
76 N north-east
Explanation:
V = √(44²+62²) = 76 N
A 70 kg astronaut throws a 5 kg ball with a velocity of 20 m/s east. What is the velocity of the astronaut?
Answer:
[tex]V_a =1.4285m/s[/tex]
Explanation:
From the question we are told that
70 kg astronaut
5 kg ball
A velocity of 20 m/s east
Generally with Law of conservation of momentum in place for a body in space
initial and final momentum must be equal
Therefore
[tex]M_b*V_b=M_a*V_a[/tex]
[tex]M_b=Mass of ball \\V_b=Ball velocity \\M_a= Mass of astronaut \\V_a= Astronaut velocity[/tex]
Mathematically solving for[tex]V_a[/tex]
[tex]V_a =\frac{5*20}{70}[/tex]
[tex]V_a =1.4285m/s[/tex]
Therefore the Astronauts velocity relative to his mass is given to be
[tex]V_a =1.4285m/s[/tex]
The velocity of the astronaut is 1.43 m/s.
From Newton's third law of motion,
To get the velocity of the astronaut, we use the formula below.
Formula:
MV = mv.................... Equation 1Where:
M = mass of the astronautV = Velocity of the astronautm = mass of the ballv = velocity of the ball.make V the subject of the equation
V = mv/M................. Equation 2From the question,
Given:
m = 5 kgv = 20 m/sM = 70 kgSubstitute these values into equation 2.
V = 5(20)/70V = 1.43 m/s.Hence, the velocity of the astronaut is 1.43 m/s.
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velocity is vector quantity but speed is scalor quantity . why ?
speed speed scalar quantity is the rate of at which an object covers distance on the other hand velocity is a vector quantity it is direction aware.velocity is the rate at which the position changes.the average velocity is the displacement or position change Per time ratio.so velocity is a vector quantity but speed is a scalar quantity
What type of equipment do you need to play Petanque?
A broom and a stone
A metal ball and a wooden ball
Anet and a rattan ball
A rubber ball and a wooden bat
A metal ball and a wooden ball
hope it helps
A 115 kg anvil is 85.0 m above the Coyote. How much gravitational
potential energy does it have?
Answer:
[tex]\boxed {\boxed {\sf 95,795 \ Joules}}[/tex]
Explanation:
Gravitational potential energy is found using the following formula.
[tex]E_p=m*g*h[/tex]
where m is the mass, g is the gravitational acceleration, and h is the height.
1. Define Variables
We know the anvil's mass is 115 kilograms and it's 85.0 meters above the coyote. Assuming this is on Earth, the acceleration due to gravity is 9.8 m/s²
[tex]m=115 \ kg \\h= 85.0 \ m \\g= 9.8 \ m.s^2[/tex]
2. Calculate Potential Energy
Substitute the values into the formula.
[tex]E_p=(115 \ kg)*(9.8 \ m/s^2)*(85.0 \ m)[/tex]
Multiply the first two numbers together.
[tex]E_p=1127 \ kg*m/s^2*(85.0 \ m)[/tex]
Multiply again.
[tex]E_p=95795 \ kg*m^2/s^2[/tex]
1 kilogram square meter per square second is equal to Joule. Therefore, our answer of 95795 kg*m²/s² is equal to 95795 J[tex]E_p=95795 \ J[/tex]
The anvil has 95,795 Joules of gravitational potential energy.
A 1.5 kg 8-Ball is traveling at 2.3 m/s to the right when it strikes and bounces off a 5.2 kg bowling ball which is at rest. After the collision, the 8-Ball moves to the left with a velocity of 1.1 m/s. What is the final velocity of the bowling ball?
_______________m/s (nearest hundredth)
Answer:
-0.34m/s
Explanation
According to the law of conservation of momentum
m1u1 +m2 u2 = (m1+m2)v
m1 and m2 are the masses
u1 and u2 are the initial velocities
v s the common velocity
Given
m1 = 1.5kg
m2 = 5.2kg
u1 = 2.3m/s
u2 = -1.1m/s (left direction)
Required
Final velocity v of the ball
Substitute into the formula
1.5(2.3)-5.2(1.1) = (1.5+5.2)v
3.46-5.72 = 6.7v
-2.26 = 6.7v
v = -2.26/6.7
v = -0.34m/s
Hence the final velocity of the bowling ball is 0.34m/s towards the left
WILL MARK BRAINLIEST
How much heat is required to raise the temperature of 150 grams of water from 15
C to 20 C, give that the specific heat of water is 4.18 J/g/C?
- 7.18 J
- 125 J
- 179 J
- 3,140 J
Answer:
aww that's simple! its B can i get brainliest? i really need some points rn <3
Explanation:
Answer:
B
Explanation:
Someone pls help mee
Where do coaster cars have the least amount of potential energy?
Answer:
Gravitational potential energy is greatest at the highest point of a roller coaster and least at the lowest point.
A student claims that any object in motion must experience a force that keeps it in motion. Do you agree or disagree?Explain your reasoning.
Answer:
i disagree because if you throw a ball in the air gravity will bring it down so only the force that moved it was needed.
Explanation:
balance chemical equation NaNO3=>NaNO2+O2
Nuclear energy is currently used in which three kinds of vehicles?
A. cars, submarines, spacecraft
B. submarines, ships, spacecraft
C. spacecraft, airplanes, cars
D. airplanes, submarines, ships
Answer:
d
Explanation:
while flying a plane parallel to the ground a pilot releases a fuel tank in order to reduce the planes mass. what is the tanks final velocity after falling 10 m
La velocidad vertical del tanque después de caer 10 m es 14 m/seg .
La velocidad vertical del tanque se calcula mediante la aplicación de la fórmula de velocidad , la componente vertical Vfy, del movimiento horizontal como se muestra a continuación :
Vfy=?
h = 10 m
Fórmula de Velocidad vertical Vfy:
Vfy² = 2*g*h
Vfy= √(2*9.8m/seg2* 10m )
Vfy= 14 m/seg
Objects on Mars weigh about 38% what they do on Earth. While driving on Earth, a Mars rover moves at a speed of 30 mph. If the rover moves with the same speed on Mars, would it have more, less, or the same momentum as when on Earth
Answer:
The same momentum as when on Earth
Explanation:
From a background understanding of science, the mass of an object is constant irrespective of its location.
This implies that the rover has the same mass on the earth as on the moon.
Now, we shall determine the momentum of the rover on Earth and on the Mar.
For Earth:
Let the mass on Earth (Mₑ) = 1 kg
Velocity on Earth (Vₑ) = 30 mph = 30 × 0.447 = 13.41 m/s
Momentum on Earth (Mₒₑ) =?
Momentum = mass × velocity
Mₒₑ = Mₑ × Vₑ
Mₒₑ = 1 × 13.41
Mₒₑ = 13.41 Kgm/s
Thus the momentum of the rover on Earth is 13.41 Kgm/s
For Mar:
Mass on Mar (Mₘ) = Mass on Earth (Mₑ), since mass is constant.
Mass on Mar (Mₘ) = 1 kg
Velocity on Mar (Vₘ) = Velocity on Earth (Vₑ), since the rover move with the same velocity as described by the question.
Velocity on Mar (Vₘ) = 13.41 m/s
Momentum on Mar (Mₒₘ) =?
Momentum = mass × velocity
Mₒₘ = Mₘ × Vₘ
Mₒₘ = 1 × 13.41
Mₒₘ = 13.41 Kgm/s
Therefore, the momentum of the rover on Mar is 13.41 Kgm/s
Summary:
Momentum on Earth (Mₒₑ) = 13.41 Kgm/s
Momentum on Mar (Mₒₘ) = 13.41 Kgm/s
Thus, the rover will have the same momentum as when on earth
The momentum of the object on Mars will be the same as on Earth.
The given parameters;
speed of the object on Earth and Mars, v = 30 mphWeight is a vector quantity because it changes when acceleration due to gravity on the object changes while mass is scalar quantity, with a constant value in all places in the universe.
The momentum of an object is calculated as;
P = mv (kgm/.s)
Since the speed and mass of the object will be the same on both planets, the momentum will also be the same.
Thus, the momentum of the object on Mars will be the same as on Earth.
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What is the thermal energy of an object?
the total kinetic energy of its particles
the total potential energy of its particles
its total temperature
the total kinetic and potential energies of its particles
Answer:
The total kinetic and potential energies of its particles
The thermal energy of an object is the:
D. the total kinetic and potential energies of its particles
What is thermal energy?Thermal energy is the sum of the kinetic and potential energy of all the particles in an object.
Examples are Exothermic chemical reactions, such as oxidation, which convert the potential energy of the materials into thermal kinetic energy, thus increasing the resulting temperature.
Thus, option D is correct.
Find more information about Thermal energy here:
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A box of weight 200N is placed on a ground of 20m square . Find the pressure
exerted by the box.
Answer:
10 Pascal
Explanation:
[tex]pressure =\frac{force}{area}[/tex]
[tex]pressure= \frac{200}{20}[/tex]
pressure = 10 Pa
the ... in an atom move about in the space surrounding the nucleus
what is the missing word- ...
What’s the meaning of Density
Answer:
d= m/v
density is mass per unit volume.
Density describes how tightly packed particles are so if something is more dense the particles are going to be packed closely together and if something is less dense they will be looser and not as tightly packed.
The histogram shows final exam scores, and the table shows letter grades for each range of scores. A passing grade is 60% or higher.
A 90–100%
B 80–90%
C 70–80%
D 60–70%
Which statement is supported by the data in the histogram?
A. Twenty students received As and Bs.
B. Forty students received scores between 40% and 60%.
C. Most students received As and Bs.
D. Most students passed the final exam.
Answer:
D
Explanation:
Edg2020
Real world System of equations
i need help with this question, i’ll mark as Brainliest!!
Answer:
The given Device is a :
SOLENOID.Since at the left corner, The MFL (Magnetic field lines) are entering the solenoid OR terminating at this end, This end turns out to be the SOUTH POLE.
According to the arrows, The current is always in the direction of the magnetic field. So, The current is leaving the Solenoid at the top right corner.
[tex]\rule[225]{225}{2}[/tex]
Hope this helped!
~AH1807Answer:
The name of the device is Solenoid. Left end represents South Pole. The current ( I ) is leaving the wire coil at the top right corner.
Explanation:
Hope you understand....
Will someone please look at my other questions
Answer:
eeeeeeeeeeeeeeeeeeeeeeeeeeeee
Explanation:
How does friction affect energy
Answer:
Friction is a resistive force to motion. When two bodies move against each other some of the kinetic energy is converted to heat energy due to friction. This reduces the total kinetic energy in the system.
Explanation:
What is the change in momentum of a 50. kg
woman goes from running at 8.0 m/s to 0.0
m/s?
Answer:
400 kg-m/s
Explanation:
Given that,
Mass of the woman, m = 50 kg
Initial velocity, u = 8 m/s
Final velocity, v = 0 m/s
We need to find the change in momentum of the woman. It can be given by :
[tex]\Delta p=m(v-u)\\\\=50\times (8-0)\\\\=400\ kg-m/s[/tex]
So, the change in momentum is 400 kg-m/s.
A geothermal power station has a power output of 300 000 W. Calculate how many kWh of energy the power station would generate in 2 days.
Answer:
The energy the power station would generate in 2 days is 14,400 kW·h
Explanation:
The given parameter for the geothermal plant are;
The power output of the geothermal plant = 300,000 W = 300 kW
The duration for which the energy produced is calculated = 2 days
Therefore, we have;
The number of seconds in 2 days = 2 days × 24 hours/day × 60 min/hr × 60 seconds/min = 172,000 seconds
The number of hours within 2 days = 2 days × 24 hours/day = 48 hours
The energy generated, E = Power × Time the power is utilized
Therefore, the energy the power station would generate in 2 days, [tex]E_{2 \ days}[/tex], is given as follows;
[tex]E_{2 \ days}[/tex] = 300 kW × 48 hours = 14,400 kW·h
How much work is done by a 120N force applied to a box that moves 5m?
Answer:
600J
Explanation:
w=f×s
=120×5
600J
therefore the work by a force applied to a box that moves 5m is 600J
An induced charge is when charged particles can be attracted to neutral objects.
True or false?
Answer:
the answer is true Induction charging is a method used to charge an object without actually touching the object to any other charged object.
Explanation:
What energy transformation occurs when a coil of wire moves past a magnet? plz help :(
kinetic --> electric
electric --> kinetic
magnetic --> electric
kinetic --> potential
Answer:
kinetic energy to electrical energy.
The graph shows how the vertical velocity of a parachutist changes from the moment the parachutist jumps from the aircraft until landing on the ground. Using the idea of forces, explain why the parachutist reaches a terminal velocity and why opening the parachute reduces the terminal velocity.
Answer:
once the parachute is opened, the air resistance overwhelms the downward force of gravity. The net force and the acceleration on the falling skydiver is upward. ... The skydiver thus slows down. As the speed decreases, the amount of air resistance also decreases until once more the skydiver reaches a terminal velocity.
Explanation:
As the parachute is opened the air and due to the downward force of gravity the resource is upwards hence the skydiver falls slowly.
Who is a parachutist?A parachutist is one who uses a parachute when making a skydive. Once the parachute is opened the air offers some resistance and due to the downward force of gravity.
The net force and force of acceleration are on the skydiver and a, as a result, he falls slowly. As the speed gets decreased the amount of air resistance will also decrease.
Find out more information about the parachutist
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