Answer:
This shows inertia because inertia is an object's resistance to change in motion. When the person (imma call them a she) who pulled the chair from under the guy did that, the chair was the one affected by the force of the girl, not the guy. The guy continued heading in the direction he was originally going, which was down.
At least, that's about how I would answer this question.
Select ALL the items that are influenced by jet streams.
Lesson 1.08
Select 2 correct answer(s)
Question 15 options:
atmospheric chemistry
precipitation
temperature
car travel
Answer:
precipitation and tempurature
Explanation:
i just took the quiz
Answer:
B.precipitation
C.temperature
Explanation:
hope this helps! :D
How is the sun energy important to the earth
From a high tower one ball is dropped from rest and the second ball is simultaneously projected horizontally. Neglecting air resistance which ball will reach the ground earlier?
They will reach the ground at the same time.
Because where h is the height of the tower and g is acceleration due to gravity. Since for both the balls h and g are the same, the time must be the same hence both the balls will reach the ground at the same time.
3 students push on a 60kg Box, they each exert a 25 N force. What is the box’s acceleration if they all push in the same direction
Answer:
Acceleration = 1.25 m/s²
Explanation:
Net force can be defined as the vector sum of all the forces acting on a body or an object i.e the sum of all forces acting simultaneously on a body or an object.
Given the following data;
Force applied = 25 N
Mass = 60kg
The net force acting on the box = 25 + 25 + 25 = 75N
To find the acceleration;
Net force = mass * acceleration
Substituting into the equation, we have;
75 = 60 * acceleration
Acceleration = 75/60
Acceleration = 1.25 m/s²
Meaning of direct current
Answer:
Definition of direct current. : an electric current flowing in one direction only and substantially constant in value
Explanation:
Direct current (DC) is the one directional flow of electric charge. An electrochemical cell is a prime example of DC power. Direct current may flow through a conductor such as a wire, but can also flow through semiconductors, insulators, or even through a vacuum as in electron or ion beams. The electric current flows in a constant direction, distinguishing it from alternating current (AC). A term formerly used for this type of current was galvanic current.
Answer:
Direct current is a good current of conductor of electricity
Troy, Xavier, and Emmitt are all football players. They decide to race each other up the bleachers one day. They take off running and Troy makes it to the top of the bleachers in 10 seconds, beating Emmitt by three seconds and beating Xaiver by five seconds. The bleachers are approximately 50 meters tall. Troy weighs approximately 1200 N, Emmitt weighs approximately 1750 N, and Xaiver is approximately 2100 N.
Why didn’t the liquid methane change phase before 2007?
The basic reason is that before 2007 their were not enough energy in the liquid methane molecules to break the bond between them after 2007 the energy of the molecules increases which breaks the bond and the liquid methane changes phase.
Why didn’t the liquid methane change phase before 2007?It had been summer since 2002, but the lake didn’t evaporate until 2007.
The molecular attraction between methane molecules is stronger the amount of energy absorbed by liquid methane was not enough to break the inter molecular forces until 2007.
After 2007, the sun had transferred enough energy so that the kinetic energy of the methane molecules increased enough to overcome the attraction between them.
The liquid methane evaporated and the molecules started moving away from each other.
Thus the liquid methane starts to change phase after 2007 by getting enough energy from the sun.
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A football is thrown with an acceleration of 15 m/s^2 and a force of 13 N. What is its mass?
A.150 kg
B. 0.87 kg
C. 2.0 x 105 kg
D. 0.12 kg
Section 1 - Question 3
Electromagnetic energy can be used in the medical field to treat various diseases. In order for electromagnetic energy to be used for this purpose, it must be able to be targeted to very specific cells within
the body
Which of the following are characteristics of this type of electromagnetic energy
A
low frequency, short wavelength
B
low frequency, long wavelength
С
high frequency, short wavelength
CD
high frequency, long wavelength
Answer:
D
Explanation:
Waves with long wavelength and low energy are used more in medical field. High energy waves are hazardous to cells. Hence, option B is correct.
What are electromagnetic waves ?Electromagnetic waves are waves that can pass through vacuum as well as through a medium. They are associated with an electric field and magnetic field.
The electromagnetic waves which are longer in wavelength are radio waves, microwaves and IR. They have low frequency and lower in energy. Short wavelength high energy waves are UV, x-rays and gamma rays.
In medical field long wavelength waves are more used to treat disease such as cancer. Radio waves are used to treat cancer. High frequency, high energy waves are more used in diagnostic purposes. Such as in x-rays, detection of cancer cells etc.
Find more on electromagnetic waves:
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A car is traveling with a velocity of 40 m/s and has a mass of 1120 kg. The car has ___ energy
Answer:
KE = 1/2mv^2
KE = 1/2(1120)(40^2)
KE = 560(1600)
KE = 896000
Let me know if this helps!
True or False: Modulated waves can be analog or digital.
Answer:
True
Explanation:
Modulation waves(schemes) can be analog or digital. An analog modulation scheme has an input wave that varies continuously like a sine wave.
A guitar string 0.750 m long has a fundamental frequency of 440 hz. The guitarist wants to accent the 5th harmonic by picking at the first loop from the end of the string for this harmonic. How far from the end of the string (cm) should she pick?
Answer: a b c or d
Explanation
are forces present even when there is no movement?
Answer:
Yes, gravitational force is everywhere. Even if you don't move or move, or wherever you are, there is gravitational force.
The amount of electrons that an atom loses, shares or gains is the ________________.
HELP IM REALLY STRUGGLING WITH THIS!!1
Different isotopes of an element can exist. For example, Carbon can have a mass number of 12 or a mass number of 14. Carbon always has an atomic number of 6.
Describe the difference between these two isotopes of Carbon.
In your answer, compare the number of protons, neutrons and electrons.
Answer:
Carbon 14 has 2 more neutrons than Carbon 12
same number of protons and electrons if they are both neutral atoms (that is the + or - aspect)
Explanation:
Answer:
The difference is the number of neutrons they have.
Explanation:
The atomic number is the number of protons. The number of protons is what differentiates elements. The isotope number is the total weight of the atom, that is the protons plus the neutrons. Therefore the number of neutrons is equal to the atomic mass minus the atomic number. Electrons are generally equal to the number of protons, to balance the charge of the atom.
In short: the difference between the two isotopes is that one has more neutrons.
At 30 degrees C, 90 grams of NaNO3 is dissolved in 100
grams of water. Is this solution SATURATED,
UNSATURATED, BOTH, or NEITHER
At 30 degrees C, when 90 grams of NaNO3 is dissolved in 100 grams of water, the solution becomes UNSATURATED.
A saturated solution is a solution that doesn't completely dissolve the solute.
An unsaturated solution is a solution that has a lesser amount of solute than the saturated solution in which it is being dissolved. Thus, the solute will be completely dissolved in the solution at the end of the reaction process.
From the given information:
NaNO3(salt) is the solutewater is the solvent.Since the mass of the solute is lesser than the solvent. It implies that the solute will dissolve completely in the solvent.
Therefore, the solution becomes unsaturated.
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chris and molly wins $2400 in a competition they share the money in the ratio2:3 how much money do they each receive ?
Answer:
chris gets 960 and molly gets 1440
Explanation:
add the ratio up and divide
2+3=5
2400/5=480
480x2=960
480x3=1440
960+1440= 2400
1. Which of the following has the most potential energy?
A. a ball buried under the ground
B. a ball on the ground
C. a ball at the top of a mountain
D. a ball in a tree
Answer:
C. a ball at the top of a mountain
Explanation:
It has more potential energy because it is the highest from the ground. The higher it is, the more potential energy it has.
A 2.0 kg rock is dropped from a height of 125 m. What is the momentum of the object just before it strikes the ground (Use g=10 m/s2)?
Answer:
100Ns
Explanation:
find velocity and then plug into momentum formula momentum=(velocity)(mass)
Answer:
5,000 kg-m/s going south
Explanation:
Since you're only given mass and height, not velocity. You have to find velocity first. The equation for velocity is v=2gh. We know gravity is 10 since it's given & height is also given which is 125m. After doing the math, it's 2,500. Now that you have velocity, you can plug velocity into the formula for momentum which is p=mv. 2.0 times 2,500 = 5,000 kg-m/s going south.
Do you think a circuit breaker is wired in series or parallel? Why?
Answer:
I think it's in a series
Explanation:
is this an aviation class
Question If a force of 2N is used to move a box 1 meter, how much work was done to move the box?
Answer:
I assume that the force of 2N is applied along the direction of motion and was applied for the whole 1 meter, the formula of work is this; Work = force * distance * cosθ where θ is zero degrees. Plugging in the data to the formula;
Explanation:
Work = 2N * 1m * cos 0º.
Work = 2N * 1m * 1
Work = 2Nm
Work = 2 joules
What kind of acceleration occurs when an object speeds up?
positive
negative
neutral
zero
Positive acceleration speeds the object up. Negative acceleration, aka deceleration, slows the object down. Zero acceleration means the object either keeps the same speed or isn't moving at all (we can say the speed is 0).
When an object speeds up, the positive acceleration occurs.
The acceleration is the time rate of change of velocity.
a = dv /dt
If the velocity is increased, the acceleration also increases, time remains same to cover a fixed distance.
Speeding up the object means positive acceleration. Negative acceleration also called deceleration slows the speed. Zero acceleration represents that the object is moving with constant velocity.
Thus, the positive acceleration occurs.
Learn more about acceleration.
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Please help
What is the angle of the reflected ray in the diagram above?
HELP PLEASE!!!
a= ?
v=
r=
Answer:
[tex]a=\frac{v^2}{r}[/tex]
[tex]v=\sqrt{a*r}[/tex]
[tex]r=\frac{v^2}{a}[/tex]
Explanation:
This is the formula for centripetal acceleration in terms of the tangential velocity (v) and the radius of the circular motion (r). The expression for the acceleration is already given, so simply type it as shown:
[tex]a=\frac{v^2}{r}[/tex]
For the velocity (v) multiply by "r" both sides and then use the square root to solve for v:
[tex]a*r=v^2\\v=\sqrt{a*r}[/tex]
For the radius multiply both sides by r and then divide both sides by the acceleration (a) in order to isolate r completely:
[tex]a*r=v^2\\r=\frac{v^2}{a}[/tex]
Work out the wavelength in Meters with a frequnecy of 300 MHz and speed of 3 × 10^8 m/s.
Answer:
1 m
Explanation:
The following data were obtained from the question:
Frequency (f) = 300 MHz
Velocity (v) = 3×10⁸ m/s
Wavelength (λ) =?
Next, we shall convert 300 MHz to Hz. This can be obtained as follow:
1 MHz = 10⁶ Hz
Therefore,
300 MHz = 300 MHz × 10⁶ Hz / 1 MHz
300 MHz = 3×10⁸ Hz
Thus, 300 MHz is equivalent to 3×10⁸ Hz.
Finally, we shall determine the wavelength of the as follow:
Frequency (f) = 3×10⁸ MHz
Velocity (v) = 3×10⁸ m/s
Wavelength (λ) =?
v = λf
3×10⁸ = λ × 3×10⁸
Divide both side by 3×10⁸
λ = 3×10⁸ / 3×10⁸
λ = 1 m
Therefore, the wavelength is 1 m
A 15kg boulder is moved from the Earth to the Moon. Explain what happens to the mass and weight of the boulder.
Answer:
The mass of the boulder remains constant, while its weight decreases with respect to the value of gravitational force on the moon.
Explanation:
The mass of the boulder = 15 kg
On the earth, its mass remains 15 kg. But its weight is;
weight = m x g
= 15 x 9.8
= 147 N
The boulder's weight on the earth is 147 N.
When transferred to the moon, the mass remains constant i.e 15 kg. But its weight decreases due to a change in the value of acceleration due to gravity on the moon. Thus, the boulder becomes lighter in weight.
What is the mathematical equation for the electric force between two charges? Identify each variable.
Answer: F=kq1q2/r2
"F" is the resulting force between the two charges. The distance between the two charges is "r." The "r" actually stands for "radius of separation" but you just need to know it is a distance. The "q1" and "q2" are values for the amount of charge in each of the particles.
Explanation:
The mathematical equation for the electric force between two charges will be ,[tex]\rm F = \frac{K q_1q_2}{r^2}[/tex]. It is a type of attractive force.
What is electric force?The electric force between the two charges is directly proportional to the product of the charge and inversely proportional to the square of the distance between them.
The electric force is found as;
[tex]\rm F = \frac{K q_1q_2}{r^2}[/tex]
q₁ is the magnitude of charge 1
q₂ is the magnitude of charge 2
k is the proportionality constant
r is the separated distance
F is the electric force
Hence, the mathematical equation for the electric force between two charges will be ,[tex]\rm F = \frac{K q_1q_2}{r^2}[/tex]
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What can radiation do to our cells if we are exposed to it too much?
Answer:
it can kill you cell and win you kill you no cell no life
Explanation:
Answer:
Our bodies are designed to deal with the low levels we're exposed to everyday due to evolution. But, too much radiation can damage tissues by changing cell structure and damaging DNA.
Explanation:
This can cause serious health problems, including cancer.
why it is easier to walk on soft sand if we have flat shoe with sharp heels
Answer:
less surface area the heels have the toe area and the thin heel as the flat shoe has the entire bottom.
Explanation:
Describe how body composition is measured?
Answer:
Dual Energy X-Ray Absorptiometry (DEXA) is used to measure body composition.
Explanation:
As a standard method for body composition analysis, DEXA has high accuracy along with hydrodensitometry. Its advantage is that it can measure the body composition of bone density, body fat and muscle mass for different parts.