Answer:
True: For a sound wave to propagate, air particles must be displaced in the direction of propagation - it is the displacement of these particles that causes the eardrum to vibrate and recognize the sound.
A car of mass 800 kg is climbing an incline of 10° to the horizontal. If the car moves a distance of 50 m up the incline, determine the potential energy.
Answer:
h = distance up = 50 sin 10
m g h = 800 * 9.81 * 50 sin 10 Joules
Explanation:
What is the resultant of the vectors shown?
Answer:
Option B
Explanation:
Option A is the wrong answer because the horizontal vector is in the opposite direction.
Option C is the wrong answer as the horizontal vector is in the opposite direction and all the vectors are connected head to tail [of the arrows] [Triangle law of vector addition]
Option D is the wrong answer as the horizontal vector is in the opposite direction.
The figure above shows a rod that is fixed to a horizontal surface at pivot P The rod is initially rotating
without friction in the counterclockwise direction. At time t, three forces of equal magnitude are applied
to the rod as shown. Which of the following is true about the angular speed and direction of rotation of
the rod immediately after time t?
The angular speed is decreasing and direction of rotation clockwise of the rod immediately after time t.
What is angular speed ?The rate of change of angular displacement is defined as angular speed. It is stated as follows:
ω = θ t
Where,
θ is the angle of rotation,
t is the time
ω is the angular velocity
The torque is found as;l
[tex]\rm T = F \times r[/tex]
If the force is acting on the rod from the three point is the same, the value of the torque is depends upon the radius or the perpendicular distance.
The perpendicular distance of the right force is grater. Hence, the force acting on the right side is more, and the rod will rotate clockwise.
Both the forces are acting downwards. Thus, the resultant force is the less due to which the speed is increasing.
Hence, the angular speed is decreasing and direction of rotation clockwise of the rod immediately after time t.
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Which of the following statements about postpartum depression is TRUE? Most cases of postpartum depression must be treated medically. Postpartum depression is very common. Postpartum depression is related to breastfeeding. Most women can work through severe postpartum depression on their own.
Answer:
Postpartum depression is very common
Explanation:
Common for ages 18-35
Postpartum depression: A mood disorder or depression that occurs in mothers after the birth of a baby. Usually this will be a short term disorder.
Postpartum depression is very common. The correct option is B.
Following childbirth, postpartum depression (PPD) is the most prevalent psychological disorder.
Postpartum depression (PPD) can affect one in seven women. The "baby blues" are a common postpartum condition for new mothers.
It is crucial to understand that postpartum depression is a serious problem that can have a substantial influence on mothers' and families' wellbeing.
In order to address and manage postpartum depression, it is essential to seek treatment and support from healthcare professionals.
Thus, the correct option is B.
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Your question seems incomplete, the probable complete question is:
Which of the following statements about postpartum depression is TRUE? A. Most cases of postpartum depression must be treated medically.
B. Postpartum depression is very common.
C. Postpartum depression is related to breastfeeding.
D. Most women can work through severe postpartum depression on their own.
Can someone answer and explain these questions?
Answer:
oh that looks hard but sorry im not good at math ether so sorry i couldnt help
Explanation:
Use the Figure 1 and decide which swithes should be turned "on" position in order to get the circuit given in Figure 2.
Answer:
see below
Explanation:
closing 1 and 2 will get the A part
close 6 and 3 to get the parallel B part
leave all of the other switches open
Select the correct answer. What system prepares the body for the fight-or-flight response in stressful situations? A. somatic nervous system B. sympathetic nervous system C. parasympathetic nervous system D. central nervous system
Answer:
the sympathetic nervous system
Explanation:
It triggers the fight-or-flight response.
Donald Trump has a mass of 108 kg, calculate his height when he is at the following heights (g=9.81 N/kg):
a) 20 J b) 1050 J c) 150 kJ
d) 120 J e) 2000 J f) 57 J
g) 1200 J h) 1 kJ i) 92 kJ
Answer:
(a)
Q=mgh
20=108×9.81×h
20=1059.48h
divide both side by 1059.48
h= 20/1059.48
h=0.02
(b)
1050= 108×9.81×h
1050= 1059.48h
h=1050/1059.48
divide both side by 1059.48
h=0.99
repeat the remaining following and check the answers
(c) h=0.14
(d) h=0.11
(e) h=1.89
(f) h= 0.05
(g) h=1.13
(h) h=0.94
(i) h= 86.84
note the (h) and (i) you need to change the kj to j by multiple by 1000
Light can travel through materials that you cannot see through, like wood or aluminum foil.
agree or disagree
Answer:
Agree
Explanation:
Regarding the aluminium foil, its actually a transparent material, allowing almost all light to pass through. Non-visible light, such as radio waves, x-rays, and gamma-energy photons, can most definitely can travel through wood too. So yeah agree.
Light can travel through transparent materials which we can see through. Materials like, wood, aluminums foil etc. are opaque to light and does not pass light through it. Hence, disagreeing to the statement.
What is transparency?A material is said to be transparent if light can pass through it. Thus light any of the phenomenon like transmission, absorption or reflection. A fraction of light transmitting through the material is absorbed by it.
Mirror, glass, water etc. are transparent and light can transmit through it. These materials can absorb light and reflect a portion. The amount of incident light that is absorbed by the material is dependent on its nature.
Objects that does not pass light through them are called opaque. They cant absorb or reflect light. Objects such as wood, aluminum foil, metals such as iron etc. are opaque. Thus, the given statement is false.
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why do water use acidified
Answer:
To create healthy water and more for more H (hydrogen)
Explanation:
Can anybody write a short poem about friction
Which of the following statements regarding the moon and Earth is correct?
A. Earth and the moon are nearly the same age.
B. Earth and the moon have nearly the same mass.
C. Earth is tidally locked, while the moon spins on its axis.
D. The moon is older than Earth by approximately 300 million years.
i think it is A?
When there is no torque acting
on a
body, its angular momentum is constant.
True or false
Answer:
the correct answer is true.
Explanation:
hope the above photo is self explanatory.please not forget to rate and mark brainliest!!!Answer: True
Explanation:
You have a meteorite sample and you decide to use the uranium-235/lead-207 system to date it. After analysis, you find that it has 22,500 atoms of 235U remaining, and 1,477,500 atoms of 207Pb that the 235U decayed to. What percentage of the original amount of 235U is still present?
Originally there must been
1,4775E6 + 2.25E4 = 147.75E4 + 2.25E4 = 150E4 present at start
% = 2.25 / 150 = 1.5 % of 235 U left
Electrical energy is sold by the kilowatt hour How much would it cost to heat a hot tub from 15 to 43
Answer:
hot tub is hot
Explanation:
dont get fried
Andy described the functions of two human body organs and labeled them A and B. Look at the table and select the answer that correctly identifies the organs. (2 points)
Table labeled A and B. A includes the text: Oval-shaped organs, located in body of a female, and produce eggs. B includes the text: Oval-shaped organs, located in the body of a male, and produce sperm
A are the ovaries and B are the testes
A are the testes and B are the ovaries
A are the Lungs and B are the testes
A are the ovaries and B are the kidneys
Answer:
A are the ovaries and B are the testes
If a snowboarder going over a jump has 45,000 Jof mechanical energy and you know the snowboarder has 30,000 J of kinetic energy, how much potential energy does the snowboarder have?
Answer:
15,000 J of potential energy
Explanation:
Mechanical energy of an object is the sum of its potential energy and kinetic energy.
45,000 = x + 30,000
45,000 - 30,000 = x
x = 15,000
Mark brainliest please!
ME=KE+PE
45000=30000+PE
PE=15000 J
How is the gravitational force acting on a falling object calculated
Taking into account the Newton's second law, the gravitational force acting on a falling object is calculated by multiplying mass and acceleration due to gravity (third option).
Newton's second lawIn first place, acceleration in a body occurs when a force acts on a body. There are two factors that influence the acceleration of an object: the net force acting on it and the mass of the body.
Newton's second law states that this force will change the speed of an object because the speed and / or direction will change. These changes in velocity are called acceleration.
So, Newton's second law defines the relationship between force and acceleration mathematically. This law says that the acceleration of an object is directly proportional to the sum of all the forces acting on it and inversely proportional to the mass of the object.
Mathematically, Newton's second law is expressed as:
F= m×a
where:
F = Force [N]m = Mass [kg]a = Acceleration [m/s²]Gravitational forceIn this case, the only force is gravity. Then, the gravitational force acting on a falling object is calculated by multiplying mass and acceleration due to gravity (third option).
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If a 0.08 kg cell phone falls off a table at 15 m/s, then what is its
kinetic energy right before it hits the ground?
J
Do not include units in your answer.
Enter the answer
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Check it
Improve this question
The kinetic energy of the cell phone before it hits the ground given the data is 9 J
Data obtained from the question Mass (m) = 0.08 Kg Velocity (v) = 15 m/sKinetic energy (KE) =?How to determine the kinetic energy
The kinetic energy of the cell phone can be obtained as follow
KE = ½mv²
KE = ½ × 0.08 × 15²
KE = 0.04 × 225
KE = 9 J
Thus, the kinetic energy of the cell phone is 9 J
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The kinetic energy right before it hits the ground is 0.6 J
Kinetic EnergyKinetic energy is the energy possessed by a body in motion. The S.I unit is Joule. Kinetic energy depends on:
The mass of the bodyThe velocity of the bodyGiven that a 0.08 kg cell phone falls off a table at 15 m/s, its
kinetic energy right before it hits the ground can be calculated by using the formula;
K.E = 1/2 x m x [tex]v^{2}[/tex]
The given parameters are:
mass m = 0.08 kg
velocity v = 15 m/s
Substitute the parameters into the formula
K.E = 1/2 x 0.08 x 15
K.E = 0.6 J
Therefore, its kinetic energy right before it hits the ground is 0.6 J
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Emma constructed a simple motor. When connected correctly, the coil of copper wire spins. Which of the following best describes the energy transformation that takes place between the paper clips and the spinning coil? undefined Question 4 options: Kinetic energy transforms into electrical energy. Chemical energy transforms into electrical energy. Electrical energy transforms into kinetic energy. Kinetic energy transforms into chemical energy.
Answer:
The first one. Kinetic to Electric
Explanation:
The wire is spinning which is Kinetic energy, and the energy is being transferred into electric.
how does cool roofs help the co2?
Answer:
These cool down not only the house but even helps with the potential of canceling the heating effect of up to two years of worldwide carbon dioxide emissions. Which would over help the co2 rates.
What is the frequency of this wave?
1
2
3
4
Answer:
I believe your looking at either 1 or 2
Explanation:
At a particular instant, a football has a velocity of 25 m s–1 and its direction makes an
angle of 30° above the horizontal. Determine the vertical and horizontal components
of its velocity
This question involves the concepts of the resolution of vector and rectangular components.
The vertical and horizontal components of velocity are "21.65 m/s" and "12.5 m/s", respectively.
What are rectangular components?The resolution of a vector into its rectangular components gives two components of the vector in the horizontal and the vertical directions. These components can be mathematically found as follows:
[tex]v_x=v\ Cos\ \theta[/tex]
where,
[tex]v_x[/tex] = horizontal component = ?v = velocity = 25 m/sθ = angle = 30°Therefore,
[tex]v_x = (25\ m/s)Cos (30^o)\\v_x = 21.65\ m/s[/tex]
For vertical component:
[tex]v_y=v\ Sin\ \theta[/tex]
where,
[tex]v_y[/tex] = vertical component = ?v = velocity = 25 m/sθ = angle = 30°Therefore,
[tex]v_y = (25\ m/s)Sin (30^o)\\v_y = 12.5\ m/s[/tex]
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An elevator lifts a total mass of 1.1×103 kg a distance of 40.0 m in 12.5 s. How much power does the elevator deliver?
The power delivered by the elevator is 34496 W.
What is power?Power is the rate at which energy is used up.
To calculate the power delivered by the elevator, we use the formula below.
Formula:
P = mgh/t.............. Equation 1Where:
P = Power delivered by the elevatorm = Total mass on the elevatorg = acceleration due to gravity h = HeightFrom the question,
Given:
m = 1.1×10³ kgh = 40 mt = 12.5 sg = 9.8 m/s²Substitute these values into equation 1
P = 1.1×10³×40×9.8/12.5P = 34496 W.Hence, the power delivered by the elevator is 34496 W.
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Calculate the final velocity of m1=2kg with its velocity at 5m/s
The final velocity of the two objects after the collision is determined as 4 m/s.
Final velocity of the two objects after the collisionThe final velocity of the two objects after the collision is determined from the principle of conservation of linear momentum as shown below;
m₁u₁ + m₂u₂ = v(m₁ + m₂)
where;
m1 = 2 kgu1 = 5 m/sm2 = 0.5 kgu2 = 0v = ?2(5) + 0.5(0) = v(2 + 0.5)
10 = 2.5v
v = 10/2.5
v = 4 m/s
The complete question is below:
A body of mass 2kg moving with velocity of 5m/s collides with a stationary body of mas 500g. if the two bodies move together after impact. Calculate the magnitude of their common velocity.
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You position two plane mirriors at right angles to each other a light ray strikes one mirrior at an angle of 60 to the normal and reflects towards the second mirrior what is the angle of reflection off the second mirrior
Answer:
30 degrees
Explanation:
Reflects off of mirror 1 at 60 degrees....this makes it incident to second mirror at 30 degrees ....then angle of reflection equals this angle of incidence = 30 degrees
See atached diagram
1 Explain the work being done at the New Mexico Institute of Mining and Technology and why it is significant.
The New Mexico Institute of Mining and Technology is significant because it proffer solutions to future challenges and problems.
What is the New Mexico Institute of Mining and Technology?The New Mexico Institute of Mining and Technology is also known as New Mexico Tech and it refers to a public university that is located in Socorro, New Mexico.
Basically, the New Mexico Institute of Mining and Technology is a public university which is devoted to excellence in education, innovation and research, so as to advance engineering, science, and technology.
In conclusion, the New Mexico Institute of Mining and Technology is significant because it proffer solutions to future challenges and problems.
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What is the velocity between the times t=3 to t = 4?
Answer:
The answer is t=4 + t=3=t=7
4. Solve 3x2 - 7x - 4 = 0 by completing the square. (10)
Answer:
（3x - 4）（x - 1）
Explanation:
Your question is wrong
When an object has more negative charge than positive charge, the object is called
When an object has more negative charge than a positive charge, the object is called a negatively charged object or anion.
What is a negatively charged object?A negatively charged object has more electrons than protons. This is because electrons are negatively charged subatomic particles in an atom. A neutral object has the same number of protons as electrons. Electrons or negative charges can flow freely from object to object.
When an object has a positive charge, it has more protons than electrons. Therefore, when an object has a negative charge, then that object contains more electrons than protons. Electrical effects are caused by the charge imbalance between a negatively charged object and a positively charged object.
Therefore, when an object has more negative charge than a positive charge, the object is called a negatively charged object or anion.
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