Answer:
B
Explanation:
A baby carriage is rolling down a hill. Take into consideration, the carriage has 90J of kinetic energy and the mass of the carriage is 0.5m. If you can only run at a speed of 10m/s, will you catch the baby carriage? What is the velocity of the carriage?
Answer:
YES. 6√10
Explanation:
apply E=1/2mv^2 and find the velocity of carriage which is 6√10 ms-1
as our velocity is higher than that of cart. we can catch the carriage
What's a refractive medium that focuses light to a single point?
Answer:
The convex lens is shaped so that all light rays that enter it parallel to its axis cross one another at a single point on the opposite side of the lens.
Explanation:
According to Coulomb's law, the force of attraction or repulsion between two charges is
A.
directly related to the magnitudes of the charges and the square of the distance between them.
B.
inversely related to the magnitudes of the charges and the square of the distance between them.
C.
directly related to the magnitudes of the charges and inversely related to the square of the distance between them.
D.
inversely related to the magnitudes of the charges and directly related to the square of the distance between them
Answer:
B is the answer
Explanation:
thank you I hope it helps you
The force is directly related to the magnitudes of the charges and inversely related to the square of the distance between them. Then the correct opption is C.
What is the Coulomb's law?The Coulomb's law states that the electrostatic force is the ratio of the product of the charges and square of the distance between them.
Let the cherges be q and Q and the distance between them is r. Then the force is given as,
F = kqQ / r²
The power is straightforwardly connected with the extents of the charges and contrarily connected with the square of the distance between them. In this way, the right choice is C.
Thus, the correct option is C.
Learn more about Coulomb's law:
https://brainly.com/question/506926
#SPJ6
Please Help Me!!!........
Answer:
1.Siddartha Gautama
2.no single founder
3jesus christ
4.muhammad
5.abraham
The speed of sound in water is less than that in air. *
True
False
Answer:
The speed of sound in water is two times slower than that in air. Sound travels much faster in space than in water. Warmer water allows sound to travel faster so i think true
Explanation:
importance of electric circuit
Answer:
It is important because it carries useful energy through your house that you can use for a variety of tasks.
Explanation:
Hope this helped !
Convert 50,000 ML to mL
1. 5 x 10^5 mL
2. 5 x 10^-5 mL
3. 5 x 10^13 mL
4. 5 x 10^-13 mL
5 A truck travelling at 25 m/s puts on its brakes for 4 s. This produces an acceleration of –2 m/s. What is the truck's
velocity after braking?
Answer: The truck's velocity after braking = 17m/s.
Explanation:
Given: Initial velocity(i) = 25 m/s
Time(t) = 4s
Acceleration(a) = -2 m/s ²
We use the following formula to compute final velocity (v):
[tex]v= i+at\\\\\Rightarrow\ v=25+(-2)(4\ \ \ [\text{Substitute all values}]\\\\\Rightarrow\ v=25-8\\\\\Rightarrow\ v=17\ m/s[/tex]
Hence, the truck's velocity after braking = 17m/s.
One star has a magnitude of -1.5 and another star has a magnitude of +0.6. What is the ratio of brightness of these two stars?
Answer:
7
Explanation:
[tex]The \ ratio \ of \ brightness \ of \ these \ two \ stars \ is:[/tex]
[tex]\dfrac{b_{first \ star }}{b _{second \ star }}= 2.512^{(m_{(second \ star )} - (m_{first \ star } ))}[/tex]
[tex]\dfrac{b_{first \ star }}{b _{second \ star }}= 2.512^{(0.6 - (-1.5 ))}[/tex]
[tex]\dfrac{b_{first \ star }}{b _{second \ star }}= 2.512^{(2.1)}[/tex]
[tex]\dfrac{b_{first \ star }}{b _{second \ star }}= 6.9[/tex]
[tex]\mathbf{\dfrac{b_{first \ star }}{b _{second \ star }} \simeq 7}[/tex]
C
the energy of position or shape
Calculate the Kinetic Energy of a 0.06 kg tennis ball moving at a velocity of 30
m/s *
Kinetic & Potential Energy
KE = { m V? PE = mgh
Quick & Simple!
54
Calculate the potential energy of a 30 kg rock sitting on top of a 12 m shelf
Answer:
27J
3528J
Explanation:
First problem:
Given parameters:
Mass of tennis ball = 0.06kg
Velocity of tennis ball = 30m/s
Unknown:
Kinetic energy = ?
Solution:
Kinetic energy is the energy due to the motion of a body.
It is expressed as:
K.E = [tex]\frac{1}{2}[/tex] m v²
K.E = [tex]\frac{1}{2}[/tex] x 0.06 x 30² = 27J
Second problem:
Given parameters:
Mass = 30kg
Height = 12m
Unknown:
Potential energy = ?
Solution:
Potential energy is the energy due to the position of a body.
Mathematically;
Potential energy = mgh
m is the mass
g is the acceleration due to gravity
h is the height
Now;
Potential energy = 30 x 9.8 x 12 = 3528J
When synthetic materials are made from natural materials, the atoms that make
up the original substances are regrouped into new molecules. *
True
False
Can you please tell me the answer
Answer:
Explanation:
s=d/t
7.5 times 10^10/8.0 times 10^6=9.375 times 10^15
Hope this helps
Which of the following describes a lunar eclipse?
A
The Moon's shadow is on Earth.
B
Earth's shadow is on the Sun.
C
Earth's shadow is on the Moon.
D
The Moon's shadow is on the Sun.
Answer:
From our perspective on Earth, two types of eclipses occur: lunar, the blocking of the Moon by Earth's shadow, and solar, the obstruction of the Sun by the Moon. When the Moon passes between Sun and Earth, the lunar shadow is seen as a solar eclipse on Earth.
Hopes this helps
Answer:
c
Explanation:
when earth casts it shadow on moon then moon is not visible from earth.
and lunar eclipse occurs when earth casts its shadow on moon
What is a magnet in your own words
A _______ is a series of waves that come ashore at interval 10-45 mintues
Answer:
tsunami
Explanation:
A tsunami is a series of waves that come ashore at interval 10-45 mintues
Isabella has lived in Miami, Florida, all her life, and she knows the weather is warm and humid much of the time. What factors play a part in determining the climate found in Florida? Choose the three that apply
A-Ocean currents
B-Latitude
C-High altitude
D-Prevailing winds
E-Long distance from water
Answer:
B,A, and D
Explanation:
Ms. Perry travels north 5 km, 10 Km west, and then turns and travels 5 Km south. What is her displacement?
Answer:
Her displacement is 10km
Explanation:
An illustrative diagram for the journey is shown in the attachment below.
From the question,
She travels north 5km, which is given by /AB/ in the diagram, and 10km west, which is given by /BC/ in the diagram. She then travels 5km south, which is given by /CD/ in the diagram. To determine her displacement,
Displacement is the shortest distance from an initial position to a final position.
Therefore, her displacement is given by /DA/ in the diagram.
NOTE: /DA/ = /BC/ (Opposite sides of a rectangle)
Since /BC/ = 10km
∴ /DA/ = 10km
Hence, her displacement is 10km.
A high speed train travels with an average speed of 227 km/h. The train travels for 2 h.how far does the train travel in meters?
2 x 227 km/h = 454 m
Answer:
[tex]\boxed {\boxed {\sf 454 \ kilometers}}[/tex]
Explanation:
Distance is the product of speed and time.
[tex]d=s*t[/tex]
The speed of the train is 227 kilometers per hour. The time is 2 hours.
[tex]s= 227 \ km/hr \\t= 2 \ hr[/tex]
Substitute the values into the formula.
[tex]d= 227 \ km/hr * 2 \ hr[/tex]
Multiply and note that the hours will cancel each other out.
[tex]d= 227 \ km* 2[/tex]
[tex]d=454 \ km[/tex]
The train travels 454 kilometers in 2 hours.
Which of the following statements about gravity is FALSE?
B
A Gravity plays an important role in the formation of solar systems.
Gravity keeps the planets in their proper orbits around the Sun.
Stars are made of clouds of dust and gas that come together as a result
of gravity.
The Law of Universal Gravitation states that the gravitational force is
stronger as objects get farther apart.
с
D
Answer:
the last one. gravitational force is stronger as objects get further apart
The false statement about gravity among the given choices is - D. The Law of Universal Gravitation states that the gravitational force is stronger as objects get farther apart.
Gravity or the universal gravitational force is the force of attraction exerts between any two objects with mass in the universe. It is also exerted between the attraction of the earth's mass and bodies with mass near its surface.
The universal gravitational force is inversely proportional to the square of the distance between any two objects,[tex]F = \frac{1}{r^2}[/tex]So, an increase in the distance will result in the force of gravitational attraction between them also decreases make it weaker.The universal gravitational force plays an important role in making the solar system by keeping the different planets in their proper orbits around the Sun.Thus, The false statement about gravity among the given choices is - option D.
Learn more about the role of gravitational force:
https://brainly.com/question/13873024
Two conducting spheres rest on insulating stands. Sphere B is smaller than Sphere A. Both spheres are initially uncharged and they are touching. A third conducting sphere, C, has a positive charge. It is brought close to (but not touching) Sphere B as shown. What is the net charge (positive, negative, or zero) on Sphere A?
Answer:
Explanation:
Sphere B and sphere A are touching so they will act as a single body . A positively charged sphere C is brought near sphere B . So there will be induction of charge on sphere B and sphere A . Opposite charge will be induced on nearer sphere and same charge will be induced on distant sphere . Hence sphere B will be negatively charged and sphere A will be positively charged. The amount of charge induced on sphere B and A will be same and it will remain as long as sphere C is kept near sphere B . As soon as sphere C is removed , induced charges will also neutralize each other .
1. Which energy source has no greenhouse gas emissions or health impacts on humans, but is only available in certain geographic locations?
Geothermal power
Nuclear power
Hydrogen fuel
Methane gas
Answer:Nuclear power
Answer: geothermal
Explanation: I just took this test.
a car starts at a speed of 3.5m/s and picks up speed for 2.8 seconds until it is traveling 7.2 m/s; the car traveled 15.0 meters. What is the car's acceleration
Answer:
a = 1.32 [m/s²]
Explanation:
To calculate this problem we can use the following equation of kinematics.
[tex]v_{f}=v_{o}+a*t[/tex]
where:
Vf = final velocity = 7.2 [m/s]
Vo = initial velocity = 3.5 [m/s]
t = time = 2.8 [s]
a = acceleration [m/s²]
[tex]7.2=3.5+a*2.8\\2.8*a=3.7\\a=1.32[m/s^{2} ][/tex]
Which statement is a conclusion ASAP
A. How can cut flowers stay fresh for a longer period of time ?
B. Florists put cut flowers in sugar water , so flowers in sugar water stay fresh longer
C. It´s better to give people balloons than cut flowers that will die
D. Cut flowers placed in sugar water stay fresh longer than flowers in regular water
In a perfectly elastic collision, a 0.400 kg ball moving toward the east at 3.7 m/s suddenly
collides head-on with a 0.200 kg ball sitting at rest.
An outfielder with a mass of 86 Kilograms catches a baseball with a mass of 0.15 kilograms.The velocity of the ball just before being caught is 40 meters per second.What is the impulse imparted by the ball onto the outfielder?
A. 6.00 Ns
B. 3,440 Ns
C. 2.00 Ns
D. 3,434 Ns
Answer:
C
Explanation:
How many neutrons does potassium have?
Answer:
the answer is 20 neutrons
Explanation:
Answer:
20 neutrons
The nucleus of an atom of potassium contains 19 protons and 20 neutrons.
a steel sphere and brass ring have diameter 25cm and 24.9cm at 15°C.If the sphere and the ring are heated together.what is the temperature at which the sphere could pass through the ring? alpha steel= 12×10^-6 and alpha brass= 20×10^-6
Answer:
Explanation:
Due to heat energy , metal expands . Formula for linear expansion is as follows .
L = l ( 1 + α Δt )
where L is expanded length , l is original length , α is coefficient of linear expansion and Δt is increase in temperature .
To pass the sphere through the ring , the diameter of both ring and sphere should be same after heating . Let after increase of temperature Δt , their diameter becomes same as L . The linear coefficient of brass and steel are
20 x 10⁻⁶ and 12 x 10⁻⁶ respectively .
For steel sphere ,
L = 25 ( 1 + 12 x 10⁻⁶ Δt )
For brass ring
L = 24.9 ( 1 + 20 x 10⁻⁶ Δt )
25 ( 1 + 12 x 10⁻⁶ Δt ) = 24.9 ( 1 + 20 x 10⁻⁶ Δt )
1.004( 1 + 12 x 10⁻⁶ Δt ) = ( 1 + 20 x 10⁻⁶ Δt )
1.004 + 12.0482 x 10⁻⁶ Δt = 1 + 20 x 10⁻⁶ Δt
.004 = 7.9518 x 10⁻⁶ Δt
Δt = 4000 / 7.9518
= 503⁰C.
final temp = 503 + 15 = 518⁰C .
Which statement is accurate about how the aurora borealis is formed?
When the electrons jump to a higher energy state, they release energy as electromagnetic radiation, light.
When electrons are excited, they move to a lower energy level.
An electron in an energy level closest to the nucleus has greater energy.
When the electrons fall to a lower energy state, they release energy as electromagnetic radiation, light.
Answer:
When the electrons jump to a higher energy state, they release energy as electromagnetic radiation, light.
Explanation:
When the solar wind gets past the magnetic field and travels towards the Earth, it runs into the atmosphere. As the protons and electrons from the solar wind hit the particles in the Earth's atmosphere, they release energy – and this is what causes the northern lights.
An Indy 500 race car's velocity increases from 4.0 m/s to +36
m/s over a 4.0 s time interval. What is its average
acceleration?
Answer:
The average acceleration is [tex]8\ m/s^2[/tex]
Explanation:
Uniform Acceleration
When an object varies its velocity at the same rate, the acceleration is constant.
The relation between the initial and final speeds is:
[tex]v_f=v_o+a.t[/tex]
Where:
vf = Final speed
vo = Initial speed
a = Constant acceleration
t = Elapsed time
The acceleration can be calculated by solving for a:
[tex]\displaystyle a=\frac{v_f-v_o}{t}[/tex]
The Indy 500 race car increases its speed from vo=4 m/s to vf=36 m/s in t=4 s. Thus, the average acceleration is:
[tex]\displaystyle a=\frac{36-4}{4}=8\ m/s^2[/tex]
The average acceleration is [tex]8\ m/s^2[/tex]
A 2kg baseball has a momentum of 75 kg m/s. Find it’s speed
Answer:
37.5m/s
Explanation:
momentum = mass x velocity
momentum / mass = velocity = speed
75kg*m/s / 2kg = 37.5m/s
