D) Less than 20.
Explanation:
Equivalent resistance in a parallel combination is less than their individual value.
the force has to be specified both in terms of its magnitude as well as its direction true or false?
Anwser
The strength of a force is usually expressed by its magnitude. We have also to specify the direction in which a force acts.
A raindrop falls from a cloud 100 m above the ground. Neglect air resistance. What is
the speed of the raindrop when it hits the ground? Is this a reasonable number? Explain.
Answer:
Explanation:
Use the kinematic equation
[tex]V^2=V^2_i+2a(x_f-x_i)[/tex]
The initial velocity was given from the word "falls." Acceleration due to gravity is 9.8 m/s^2.
[tex]V^2=0^2+200(9.8)[/tex]
[tex]V=\sqrt{1960} =44.27m/s[/tex]
A raindrop falls from a cloud 100 m above the ground. Neglect air resistance. The speed of the raindrop when it hits the ground would be 44.27 meters/ second.
What is mechanical energy?The sum of all the energy in motion (total kinetic energy) and all the energy that is stored in the system (total potential energy) is known as mechanical energy.
As given in the problem A raindrop falls from a cloud 100 m above the ground. Neglect air resistance, then we have to find out the speed of the raindrop when it hits the ground,
The speed of the raindrop = √(2gh)
=√(2*9.8*100)
=44.27 meters/seconds
Thus, if a raindrop falls from a cloud 100 m above the ground. Neglect air resistance. the speed of the raindrop when it hits the ground would be 44.27 meters/ second.
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compare the physical properties of air and gold .
Answer:
Gold is metallic, with a yellow color when in a mass, but when finely divided it may be black, ruby, or purple. It is the most malleable and ductile metal; 1 ounce (28 g) of gold can be beaten out to 300 square feet. It is a soft metal and is usually alloyed to give it more strength.
Formula --
Molecular Weight (lb/m o l) 28.96
Critical Temp. (°F) N/A
Critical Pressure (p s i a) N/A
Boiling Point (°F) -317.8
Melting Point (°F) N/A
Psat 70°F (p s i a) (note 1)
Explanation:
A net force of 30 N is applied to an object, causing it to accelerate at 20m/s^2. What is the mass of the object?
Answer:
mass of that object is = 30 × 29 = 870N
asap please thank you!!
Answer:
Opinions of the author
Not relevant in a scientific paper :)
If the ball rolls out of bounds on the sideline in soccer, what is the result?
a.Free Kick
b.Goal Kick
c.Throw-In
d.Corner Kick
Heat flows from hotter regions of an object to cooler regions of
an object. True or false?
Answer:
true
Explanation:
Answer:
True
Explanation:
is the threat of or actual use of physical force against oneself or another person.
A. Hazing
B. Conflict
C. Mediation
D. Violence
Answer:
D. Violence
Explanation:
Violence is the threat of or actual use of physical force against oneself or another person. Violence often results in injury or death.
Answer:
D.Violence
Explanation:
You're welcome!
A scientific theory is_____.
A. A well-tested explanation for a broad set of observations
B. A well-tested explanation for a widely accepted hypothesis
C. A proven explanation for the results of multiple experiments
D. A hypothesis that has stood the test of time
Answer:
B. A well-tested explanation for a widely accepted hypothesis
Explanation:
This is true about a scientific theory going by the fact of it being a well tested explanation. For example, in one of the Newtons law of motion which he stated to be "To every action, there is equal and opposite reaction", the hypothesis has been known till he was able to offer a well tested explanations with calculations showing that, it was actually true.
(1) Explain : Market and its characteristics.
Answer:
market is a place where we sell or buy things ( goods)
it's characteristics are
buying and selling goods
perfect competitions
market doesn't refer only a fix place
Which would most likely contain this same type of current? the air above a wildfire a carton of milk in a refrigerator a snowdrift on a shady mountainside a boulder in a hot desert
Answer: the air above a wildfire
Explanation:
First part of question is: The diagram shows currents that form as water is heated.
When water is being heated from below, convection currents are used. This happens when the molecules at the bottom are heated thus giving them energy and enabling them rise to the surface. The colder water at the surface will therefore sink to the bottom where is is heated making it rise as well and the process is repeated.
When a wildfire is ignited, the concept is the same. The air above the wildfire is the water in this scenario. It is heated at the bottom and rises thereby forcing the air above to come down and be heated as well. Both situations uses convectional currents.
Answer:
The air above a wildfire
Explanation:
A force of 20N acted on a ball thereby imparting an impulse of 70N's to the ball. For how long did the force act on the ball?
Answer:3.5 seconds
Explanation:
PLS ANSWER FAST WILL GIVE BRAINLEST!!!
What is the force of a 3 kg skateboard accelerating at a rate of 4m/s2?
Plug in the numbers: Force= mass x acceleration
Answer:
F = 12 N
Explanation:
F = m × a
F = 3 × 4
F = 12 kg m/s²
F = 12 N
How does a pizza,car, and a candle cause change? Correct Answer gets Brainliest:)
6 kg block slides to the east across a frictionless surface with a momentum of 30 kg x meters per second strikes an object with an impulse of 10 newtons per second to the west of the block, what is the speed of the block at collission
Answer:
Explanation:
Initial momentum = 30 kg m/s .
impulse on the object = 10 N s towards west . = - 10 Ns
impulse = change in momentum
Let velocity after impulse be v
momentum after impulse = 6 v
change in momentum = 6v - 30
So
- 10 = 6v - 30
20 = 6v
v = 3.33 m /s
Since the velocity is positive , that means it is moving in the same direction as earlier .
PLEASE HELP Because of the theory of the Principles of Trace Evidence, what belief are forensic scientists guided by when investigating a crime scene?
Answer:
The Principles of Trace Evidence state that when something comes into contact with something else there is always a trace left behind. This tells forensic scientists that there will always be evidence of someone being present at a crime scene, they just have to find it.
Explanation:
sources: dude trust me
what is the difference between an open and closed circuit?
- Explain how the Earth, the sun, and time are connected,
Answer:
the rotation of earth is determining what part of the sun faces what part of earth making time the part thats away from the sun would be night and the one facing the sun itself would be day
help plsss !!!!!!!7777$$
Answer:
1.Proton,Nuetron,Electron
2.Electromagnetic force
3.J.J Thompson, Electron
4.b Nucleus
5.c Proton and Neutron
6. Electron
Explanation:
Just finished taking Physical science. Good Luck!
In a sonometer by what change in linear density of wire its velocity becomes double? Keeping tension of wire constant
Answer:
Explanation:
In a sonometer , expression for speed of wave produced can be given as follows .
v = [tex]\sqrt{\frac{T}{m} }[/tex]
v is velocity , T is tension in wire , m is density per unit length .
Here v is inversely proportional to square root of m . So if m becomes m / 4
velocity changes as follows .
velocity = [tex]\sqrt{\frac{T}{\frac{m}{4} } }[/tex]
= [tex]\sqrt{\frac{4T}{m} }[/tex]
= 2v
velocity becomes two times . Hence to make velocity two times , mass per unit length has to be changed to one fourth value , keeping tension constant .
Need help with physics.
Question: A 65 kg child riding a Ferris wheel has a tangential speed of 9.5 m/s. Find the magnitude of the centripetal force on the child if the distance from the child to the axis of the wheel is 20 m.
The centripetal force : F = 293.3125 N
Further explanationGiven
mass = 65 kg
v = 9.5 m/s
r = 20 m
Required
the centripetal force
Solution
Centripetal force is a force acting on objects that move in a circle in the direction toward the center of the circle
[tex]\large {\boxed {\bold {F = \frac {mv ^ 2} {R}}}[/tex]
F = centripetal force, N
m = mass, Kg
v = linear velocity, m / s
r = radius, m
Input the value :
F = 65 x 9.5² / 20
F = 293.3125 N
1. Metal paper clips do not attract or repel each other. When an electromagnet is placed nearby, the paper clips can be observed to move toward it. Which statement describes this phenomenon?
Paper clips turn into permanent magnets after exposure to a magnetic field.
The electromagnet reacts to the strong force of attraction from paper clips.
Electrons flow freely into the magnetic field, causing the paper clips to move.
Magnetic domains within the paper clips align with the magnetic field.
2. An electromagnet is built using a 9-volt battery with conducting wire connected to a switch and coiled around an iron nail. A pile of metal paper clips is moved close to the iron nail, yet no attraction is apparent between the electromagnet and the paper clips. What is the most likely conclusion to explain this result?
The switch is turned off.
The switch is turned on.
The paper clips are made of a nonmagnetic metal.
There are not enough coils of wire around the iron nail.
3. An experiment modeled the interaction between magnetic force and the change of energy of an object influenced by the magnetic force. The experiment’s researchers observed that the metal wheels of a small car turned as they experienced the force exerted by a magnetic field, drawing the car closer to the magnet. What energy is being gained by the car?
electrical energy
potential energy
kinetic energy
thermal energy
4. Which statement about the current and magnetic field correctly describes this figure as well as all electromagnets?
The current generates and is perpendicular to the magnetic field.
The current, which points upward, is generated by the sporadic magnetic field.
The current generates the magnetic field and is parallel and opposite to the direction of the magnetic field.
The current generated by the magnetic field is parallel and points in the same direction as the magnetic field.
5. Domains are the regions in a material in which the magnetic fields of many of the atoms are aligned facing the same direction. What is the relationship between the electrical current and the alignment of atoms responding to the current?
As current increases, the alignment reverts to its random arrangement.
As current decreases, the alignment becomes continuous.
The alignment of atoms has nothing to do with the changing current.
As current increases, the alignment becomes more organized.
Answer:
Metal paper clips do not attract or repel each other. When an electromagnet is placed nearby, the paper clips can be observed to move toward it. Which statement describes this phenomenon?
- Magnetic domains within the paper clips align with the magnetic field.
An electromagnet is built using a 9-volt battery with conducting wire connected to a switch and coiled around an iron nail. A pile of metal paper clips is moved close to the iron nail, yet no attraction is apparent between the electromagnet and the paper clips. What is the most likely conclusion to explain this result?
- The switch is turned off.
An experiment modeled the interaction between magnetic force and the change of energy of an object influenced by the magnetic force. The experiment’s researchers observed that the metal wheels of a small car turned as they experienced the force exerted by a magnetic field, drawing the car closer to the magnet. What energy is being gained by the car?
- Kinetic Energy
Which statement about the current and magnetic field correctly describes this figure as well as all electromagnets?
- The current generates and is perpendicular to the magnetic field.
Domains are the regions in a material in which the magnetic fields of many of the atoms are aligned facing the same direction. What is the relationship between the electrical current and the alignment of atoms responding to the current?
- As current increases, the alignment becomes more organized.
Explanation:
I just took the test and got a 4-5. I went back to look at the one I got wrong and got the answer so here are all answers to this quick check. Use this as help, don't use it just to cheat!!
Answer: nriesberg31 above is correct :)
Explanation
Need help ASAP
Will mark BRAINLIST and thanks only for correct answers
1.What is the correct way a cell phone call goes out?
-The phone call goes out, transmits through microwaves, then moves to the central hub. Then the signals go to the nearest tower to the receiver of the call.
-The phone call goes out, transmits through radio waves, then moves to the central hub. Then the signals go to the nearest tower to the receiver of the call.
-The phone call goes out, transmits through microwaves, then moves to the tower. Then the signals go to the nearest hub to the receiver of the call.
2.Which property of AM frequencies allow them to travel over long distances?
-high amplitude
-high energy
-constant velocity
-long wavelength
3.what types of waves do cell phones use?
-radio waves
-gamma rays
-microwaves
Answer:
1. The phone call goes out, transmits through radio waves, then moves to the central hub. Then the signals go to the nearest tower to the receiver of the call.
2. long wavelength
3. radio waves
Explanation:
1. A cell phone call is works basically as a two-way radio, consisting of a radio transmitter and a radio receiver. When you dial a call to a friend on your cell phone, your phone converts your voice into an electrical signal, which is then transmitted through radio waves. The radio waves then moves to the central hub. Then the signals go to the nearest tower. The network of cell towers then relays the radio wave to your friend’s cell phone, which converts it to an electrical signal and then back to sound again.
2. AM means amplitude modulation. In AM frequencies, sound signals are modulated by changing the amplitude or maximum height of radio waves. AM frequencies use longer wavelength radio waves than FM frequencies. Because of their longer wavelengths, AM waves reflect off a layer of the upper atmosphere called the ionosphere, and thus travel over longer distances than FM waves.
3. Cell phones use radio waves to communicate.
draw a standard VOLLEYBALL COURT to show the correct player’s positioning and rotation by writing the numbers of each player.
pls help me make you brainly
Answer:
this is the picture okkkkkkkkkkkkkkkk
Tina just threw a 0.15 kg ball straight up in the air. If the ball reaches
a height of 4.0 m, what is its gravitational potential energy at this
height?
A-27j
B-5.9j
C-13j
D-2.5j
Answer:
13 j
Explanation:
I took the test and got it wrong lol
if a truck driver is driving at 30 mph and she makes a U-turn, then starts driving at 30 mph in the opposite direction, did the driver's speed or velocity change after changing direction? Why?
PLEASE THE QUIZ IS DUE IN A BIT :(
The velocity of the truck changed after changing direction because, velocity is a vector quantity.
What is meant by velocity ?Velocity of an object is defined as the rate of change of displacement of the object.
Here,
The the truck driver was driving at 30 mph and when she makes a U-turn, she starts driving at 30 mph in the opposite direction.
The quantity that changed during this change in direction is its velocity.
The speed of the truck will not change due to the change in direction because, speed is a scalar quantity.
But the velocity of the truck is changed due to the change in direction because, the velocity is a vector quantity.
A vector quantity is a quantity that has both magnitude and direction.
Hence,
The velocity of the truck changed after changing direction because, velocity is a vector quantity.
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Calculate the missing variables using the necessary formula and rules using "FORCE"
How much force is needed to accelerate a 2000kg car by 3 m/s2?
Answer:
F = 6,000 N
Explanation:
F = m × a
F = 2,000 × 3
F = 6,000 kg m/s²
F = 6,000 N
A steam governor uses negative feedback to control the speed of a steam engine. Suppose a steam governor has two balls that are each rotating with a tangential speed of 3.7 m/s. The balls are 0.10 m from the rotation axis, and the centripetal force on each ball is 670 N. What is the mass of one of the balls? Pls help
Answer:
no lo se
Explanation:
Supposing a steam governor has two balls that are each rotating with a tangential speed of 3.7 m/s. The balls are 0.10 m from the rotation axis, and the centripetal force on each ball is 670 N. Then the mass of one of the balls is 4.89 kg.
What is Centripetal force ?''Centripetal force is force acting on a body performing circular motion, which is along radius of the circle and directed towards the center of circle"
since centripetal force acts at right angle to the tangential velocity of the body, there is no displacement in the direction of the force, hence no work done. It has newton(N) as Si unit.
centripetal force is given by,
F= mv²÷r
Where m is mass of the body
v is velocity of the body
r is radius of circle at which body is moving.
Given
velocity v = 3.7 m/s
radius r = 0.10 m
centripetal force F = 670N
mass = ?
from formula we can write,
670 = m(3.7)²÷0.10
m= (670×0.10)÷(3.7)²
m = 4.89 kg
Hence mass of one of the balls is 4.89 kg
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The amount of blank
that occurs when a sound wave encounters a
barrier depends on the wave's wavelength.
Answer:
where is the paragraph so i can read
Answer:
Diffraction
Explanation:
Look at the definition of Diffraction in your notes and quiz just taken
5. Which organisms are used to manufacture human insulin?
A. algae
B. amoebas
C. bacteria
D. protozoans
The organism that is used to manufacture human insulin is known as the bacteria E. Coli. Thus, the correct option for this question is C.
What is the function of human insulin?The function of human insulin is to maintain the blood sugar level by converting the active form of sugar which is glucose into the stored form of glycogen in order to maintain the blood sugar level.
In this modern era of science and technology, recombinant human insulin is mainly synthesized or produced with the help of organisms like E. Coli which is classified in the category of bacteria, and Saccharomyces cerevisiae which is classified in the category of unicellular fungus.
Therefore, the organism that is used to manufacture human insulin is known as the bacteria E. Coli. Thus, the correct option for this question is C.
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