A 50kg boy stands on a horizontal rough ground. The coefficient with a static friction is 0.68. The maximum static friction between the boy and the ground is ?
Answer:333
Explanation:
A drug like cocaine causes more dopamine to be produced in the brain.
Please select the best answer from the choices provided
T
F
Answer:
True
Explanation:
A drug like cocaine causes more dopamine to be produced in the brain is True.
What is Dopamine?Dopamine is a type of neurotransmitter which can be a monoamine. This dopamine will be produced in brain and it acts as a chemical messenger which will be used to communicate messages between the nerve cells in the brain and to the brain and the other parts of the body.
When an individual who takes the drugs such as heroin, nicotine, cocaine and methamphetamine can increases or promotes the neurochemical reaction which will produce or increases the amount of dopamine that is a primary factor which can be the addiction that is secreted by neurons in the brain's reward center.
The functions of the reward center is memory, movement, motivation, mood, attention and more.
The diseases caused by dopamine are higher dopamine levels lead to pleasure in the mind of an addict and it makes people forget the pain or stress and gives immense pleasure.
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Contact forces & friction. Please help!!! (20 points & brainliest!)
Let w denote the weight of the box, n the magnitude of the normal force (the sheet pushing up on the box), k the magnitude of the kinetic friction force, and µ the coefficient of kinetic friction.
The kinetic friction force doesn't kick in until the sheet is tilted at an angle θ₂. Since the box is sliding down at constant speed, it's in equilibrium and the forces acting on it sum to 0.
In the horizontal direction (literally left-and-right, parallel to the ground and not the sheet), we have only the horizontal components of the friction and normal forces to worry about, so that [tex]\mathbf n_x+\mathbf f_x=\mathbf0[/tex], which reduces to
f cos(θ₂) + n cos(90º + θ₂) = 0
(where we take the right to be positive and left to be negative)
Recall that cos(90º + x) = -sin(x) for all x, and that the friction force is proportional to the normal force by a factor of µ. This gives
µ n cos(θ₂) - n sin(θ₂) = 0
Solve for µ :
µ n cos(θ₂) = n sin(θ₂)
µ = sin(θ₂) / cos(θ₂)
µ = tan(θ₂)
A 4kg block and a 2kg block can move on horizontal frictionless surface. The blocks are accelerated by a +12-N force that pushes the large block against the smaller one.'
a) Determine the force that the 2kg block exerts on the 4kg block
b) Determine the force that the 4kg block exerts on the 2kg block.
Answer:
a) -4 N
b) +4 N
Explanation:
Draw a free body diagram for each block.
For the large block, there are 2 forces: 12 N pushing to the right, and F pushing to the left.
For the small block, there is 1 force, F pushing to the right.
There are also weight and normal forces in the vertical direction, but we can ignore those.
Sum of forces on the large block in the x direction:
∑F = ma
12 − F = 4a
Sum of forces on the small block in the x direction:
∑F = ma
F = 2a
2F = 4a
Substitute:
12 − F = 2F
12 = 3F
F = 4
The small block pushes on the large block 4 N to the left (-4 N).
The large block pushes on the small block 4 N to the right (+4 N).
Which 4 of the following would be considered moderate or vigorous activities?
Question 2 options:
going for a run
vacuuming
surfing
basketball
golfing with a powered Cart.
bike riding
Earth, has a bigger mass than the Moon .
if you'll be able to go to the moon,
what happens to your weight?
Solve.
h ÷ 4 = 9
h =
Surfaces on the same body are assumed to experience meteorite impacts with the same frequency. If this is true, what could account for the stark contrast in impact crater density on bordering regions of Ganymede in the photo?
Answer:
The surface with fewer impact craters is a newer surface. It hasn’t been impacted as many times as the older surfaces
Explanation:
Sample Answer
Answer:
Newer surfaces are less damaged by impact craters, because they are less damaged by impact.
Explanation:
This is my answer.
The gravitational force of the Earth on the Moon is 1.99 x 1020 N.
If the mass of the Moon is 7.34 x 1022 kg, what is the acceleration
of the Moon?
Explanation:
ANSWER
g
m
=
R
2
GM
1.4=
R
2
(6.667×10
−11
)(7.34×10
22
)
R=
1.4
6.667×10
−11
(7.34×10
22
)
=
34.95×10
11
=1.87×10
6
m
HOPE IT'S HELP AND PLZ FOLLOW ME
Which is a sedimentary rock?
A: cools down
B: has large crystals
C: forms in layers
D: is formed from pressure and heat
ANSWER ASAP!!!
Answer:
d. is formed from pressure and heat
Explanation:
it is formed from hot magam
15 Points!!!
Fermentation of glucose by yeast produces
A) ethyl alcohol and carbon dioxide.
B) lactic acid and carbon dioxide.
C) lactic acid and oxygen.
D) ethyl alcohol and oxygen.
Answer:
A
Explanation:
Ethanol fermentation causes bread dough to rise. Yeast organisms consume sugars in the dough and produce ethanol and carbon dioxide as waste products. The carbon dioxide forms bubbles in the dough, expanding it to a foam.
Fermentation of glucose by yeast produces ethyl alcohol and carbon dioxide. (option a)
Fermentation is a metabolic process that occurs in yeast and some other microorganisms when they lack oxygen. During this process, glucose, a simple sugar, is broken down into simpler compounds. The main goal of fermentation is to produce energy for the cell without the need for oxygen.
Yeast, a type of fungus, carries out alcoholic fermentation. In this process, yeast breaks down glucose into two primary products: ethyl alcohol (also known as ethanol) and carbon dioxide. The equation representing this fermentation process is as follows:
Glucose → Ethyl Alcohol + Carbon Dioxide + Energy
The carbon dioxide produced during fermentation is responsible for the formation of bubbles in dough, which causes bread to rise. It is also the reason behind the effervescence in alcoholic beverages like beer and champagne.
So, the correct option is (a).
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How does the approximate number of atoms
in the air in your lungs compare to the num-
ber of breaths of air in the atmosphere of the
whole world?
I don’t understand what this is asking...
Which is the process by which a solid changes to a liquid?
Answer:
melting.
Explanation:
The process in which a solid changes to a liquid is called melting. The melting point is the temperature at which a solid changes to a liquid.
If you know the answer please answer the following question down in the picture below.
A car travels 30 m in 5 seconds. After accelerating for 3 seconds, it travels 20 m in 2 seconds. The cars acceleration is ___m/s
The difference of two numbers is 28. Find the number if the larger is 3 times smaller.
Answer:
14,42
Explanation:
Let the smaller number be x
Hence, the larger number = 3x
Hence,
[tex]3x-x=28\\2x=28\\x=14[/tex]
Hence, the smaller number = x = 14
The larger number = 3x = 42
What is most occurring type of element on the periodic table?
Answer:
Hydrogen is the most abundant element in the Universe; helium is second. However, after this, the rank of abundance does not continue to correspond to the atomic number; oxygen has abundance rank 3, but atomic number 8. All others are substantially less common.
Explanation:
a car is initially moving at 10 m/s and accelerates at a constant rate of 2 m/s^2 for 4 seconds, in a straight line. How far did the car carvel during this time?
A car is initially moving at 10 m/s and accelerates at a constant rate of 2 m/s², then the car will travel 56 meters.
What is Acceleration?The rate of change in an object's velocity concerning time is known as acceleration in mechanics. The vector quantity of accelerations. The direction of the net force that is acting on an object determines its acceleration.
Since acceleration has both a magnitude and a direction, it is a vector quantity. Velocity is a vector quantity as well. The definition of acceleration is the change in velocity vector over a time interval divided by the time interval.
There are several types of acceleration :
Uniform AccelerationNon-Uniform AccelerationAverage AccelerationAccording to the question, the given values are :
Initial Speed, u = 10 m/s
Acceleration, a = 2 m/s²
Time, t = 4 sec.
Use the Equation of motion to find the distance,
s = ut + 1/2 at²
s = 10(4) + 1/2 (2)(4)²
s = 40 + 16
s = 56 meters.
Hence, the distance traveled by car will be 56 meters.
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Ignoring air resistance, if a 20 kg ball and a 400 kg crate were both dropped from the
top of a building, the acceleration of the crate would be
the acceleration
of the ball.
why are those who take bribery or give bribery considered enemies of the nation?
An airplane flying due north at 90km/h is being blown due west at 50 km/h. What is the magnitude of the resultant velocity of the plane?
Answer: 103 km/hr
Explanation:
Guessed on ck-12 and it ended up being right.
Answer:
50
Explanation:
He/she guessed...Ig its 50.
In the early 1600s, Galileo Galilei performed a series of experiments to measure the acceleration of a ball rolling down a smooth inclined plane. He tried several ways to measure time, including water clocks and his own pulse. Suppose his pulse rate was 66 beats per minute, and he counted 11 beats for the ball to roll down the plane. How many seconds was the ball rolling?
Answer: A
Explanation: ive done this already bro i just wanted to help
RACTICE Uranium (molar mass = 283.03 g/mol) has the largest molar mass of any element naturally found on Earth. What is the mass of 7.50 mol of uranium?
Answer:
The answer is 2122.73 gExplanation:
The mass of a substance given it's molar mass and number of moles can be found by using the formula
mass = Molar mass × number of moles
From the question
molar mass = 283.03 g/mol
number of moles = 7.5 mol
So we have
mass = 283.03 × 7.5 = 2122.725
We have the final answer as
2122.73 gHope this helps you
a testable prediction about a possible to a problem is called a,
a: exercise
b: variable
c: hypothesis
d: experiment
Answer: C
A hypothesis is a testable explanation with some research behind it. An Hypothesis can be right or wrong.
The answer is C.
Hope it helps!
Answer:
c. is the answer but I'm not 100% sure
hypothesis
An object is thrown downward from the top of a 175 meter building with an initial speed of 10m/s
Answer:
Explanation:
we can look for the final velocity of the object using the eqaution of motion as shown:
v² = u²+2gH
v is the final velocity
u is the initial velocity = 10m/s
g is the acceleration due to gravity = 9.81m/s²
H is the height of the object = 175m
Subxtitute the given parameters inti the formula and get v:
v² = 10²+2(9.81)(175)
v² = 100+3433.5
v² = 3533.5
v = √3533.5
v = 59.44m/s
Hence the final velocity of the object is 59.44m/s
What is one other thing that needs to be controlled when testing the effect of particle size?
am sorry i thout this was my question not your answer sorry
temperature of the water must be controlled
PLEASE HELP ME!!!
Which of the following connect to the energy conversions that happen when you plug a vacuum into an electrical outlet and turn it on?
A.)kinetic, chemical, sound
B.)sound, nuclear, electrical
C.)chemical, nuclear, electrical
D.)sound, thermal, kinetic
Answer:
I think is B. sound, nuclear, electrical
but if I wrong then I am so sorry
A car is moving at 18 m/s when it accelerates at 8 m/s2 for 2 sec. What is his new velocity ?
PLZ HELP!
The image here shows four soccer balls at four different locations on an uneven soccer field very near sea level. Which soccer ball has the greatest amount of potential energy?
Ball B
Ball C
Ball A
Ball D
Answer:
The answer is B.
Explanation:
Because that's the one that's more-so higher up than the other soccer balls. This grants the ball to have higher potential energy than the rest.
Quote:
"Your body is as weak as your soul, so it is easy to separate the two."
- Akuma
The ball b would have the greatest amount of the potential energy as the mass of each ball is the same then the ball on the highest altitude would have the greatest amount of the potential energy contained with it.
What is mechanical energy?Mechanical energy is the combination of all the energy in motion represented by total kinetic energy and the total stored energy in the system which is represented by total potential energy.
The mechanical energy = potential energy + kinetic energy
As given in the problem, the image here shows four soccer balls at four different locations on an uneven soccer field very near sea level.
The potential energy of the ball = mass×gravity×height
Since each ball's mass is the same, the ball at the highest altitude would have the most potential energy within it. As a result, ball b would have the greatest quantity of potential energy.
Thus,the correct answer is option A.
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How long does it take an airplane to fly 1200 miles if it maintains a speed of 300 miles per hour
Answer:
The answer is
4 hrsExplanation:
To find the time taken we use the formula
[tex]t = \frac{d}{v} \\ [/tex]
where
d is the distance covered
v is the velocity
t is the time
From the question
d = 1200 miles
v = 300 mi/hr
We have
[tex]t = \frac{1200}{300} = \frac{12}{3} \\ [/tex]
We have the final answer as
4 hrsHope this helps you
