Answer:
56.4 dB
Explanation:
Threshold of hearing, Ir = 1 * 10^-12
Intensity of sound, I = 4.33 * 10^-7
The sound level, L is calculated thus :
L = 10log(I / Ir)
L = 10log(4.33 * 10^-7 / 10^-12)
L = 10log(4.33 * 10^(-7+12))
L = 10log(4.33 * 10^5)
L = 10 * 5.6364878
L = 56.364878
L = 56.4 dB
What is the objects average velocity?
Answer:
answer should be 10 because the line goes from (0,0) then to (1,10) and so on
A hydraulic press consist of of two
cylinders of cross sectional areas
0.2m2 and 5m². The piston in the
smaller cylinder is pushed down
with a force of 100N through a
distance 0.2m. calculate
Links
(0)
The pressure transmitted
(ii)
The force exerted by the
piston in the larger cylinder.
Answer:
Explanation:
i )
area of small piston = 0.2 m²
Force = 100 N
pressure created on small piston
= 100 / .2 = 500 N/m²
According to Pascal's law , this pressure will be transmitted to larger cylinder .
area of larger cylinder = 5 m²
ii )
pressure = force / area
force in the large cylinder = pressure x area of large cylinder
= 500 x 5
= 2500 N .
Name three things that are NOT made of matter
Answer:
Light.
Sound.
Heat.
Energy.
Gravity.
Explanation:
What is the rate at which velocity changes called?
a = 40
B= 75
m = 50 kg
kt=0.3
------------
To which mass of m2 will mass ml go down the hill? What will be the
acceleration of m2 (a)?
On which interval of masses m2 will the system rest/not move?
On which mass m2 will the system go backwards (ml up the hill) What
will be the acceleration of ml (a)?
Solve with II. Newton's law.
Answer:
A DAY IN THE LIFE OF METIS JOURNAL, I WROTE IT HOPE U LIKE IT ;))) XD
We, who live in the west, were Nomadic. So we always moved from place to place to hunt buffalo and other fur-bearing animals. And now again we have to shift everything we collected , like, all the essential needs we collected. It’s really hard to shift stuff, But when you move to a new place you get to see new beautiful places. They are just so satisfying to see! It’s like all my work(like the shifting work) is paid off. I love it! We always meet the Hudson’s bay company employees, and give them furs which we took from the bissons and other furry animals we hunted. And in exchange they give us their (Hudson’s Bay company) goods. Which is good! Because then we or I won't be able to enjoy that delicious pemmican!
The one reason that makes me proud of my parents is that because of them I am like a translator for both sides in the fur trade! Anyways coming back to the present. As I said before, we were moving today to another place, But on the way some people along with my father will ride the famous York boats carrying supplies to fur posts. I begged my father to take me with him! And as usual he gave me some silly reason for me to stay. And now since I don’t have anything to do I will-..Nevermind, My mom’s calling me. Okay after helping my mom keep the fur posts into the York boats me , my mom, and the others are just relaxing and enjoying nature just to take a break. Since, I am so obsessed with my Journal notebook today I’m just going to sit here and right what comes to my mind. I’m not like the others who always seem to be talking with someone. I like my own space!
I kind of miss my dad already, but he and his fellow members need to travel the waterways from the red river further west and north to hudson bay. These red river carts also travel the trek back and forth over land to St. Paul, Minnesota and to posts in saskatchewan. Speaking about the red river, the only large settlement in the region is the red colony. About 12000 people lived in this colony around Fort Garry. Some were the original Selkirk settlers or their descendents. They had come from Scotland with lord Selkirk when he established the colony in 1811. Many of these original settlers were poor farmers who had been displaced from their lands in scotland. They had endured many hardships in the early years of settlement, including foods, hunger, and sickness. I love studying about other colonies, cultures , history etc.
Explanation:
write this as your answer you will get extra marks
just making sure... Dancing is cardiovascular exercise, correct? >,
Answer:
Hey mate....
Explanation:
This is ur answer.....
Dancing is a great cardio workout. Like any good, low-impact cardio workout, dancing can improve cardiovascular health, increase stamina, strengthen bones and muscles and stave off illnesses....
SO IT'S YES!
Hope it helps you,
Mark me brainliest plss
FOLLOW ME!
Answer:
yes because you are doing cardio activitys
Which of the following is a service performed by local government?
I
Answer:
Creating a police department
Explanation:
Well through process of elimination, I doubt a local government has authority over the military, economy, or relationships with countries.
what are newtons laws of motion?
Answer:
In classical mechanics, Newton's laws of motion are three laws that describe the relationship between the motion of an object and the forces acting on it. The first law states that an object either remains at rest or continues to move at a constant velocity, unless it is acted upon by an external force.
Explanation:
what are two properties that lead to electromagnetic interactions? pls help I'm so confused and cant find the answer anywhere!!
Answer:
Electric charge. A fundamental property that leads to the electromagnetic interactions among particles that make up matter.
Can someone please help me with science.
Why the temperature of a resistor increase when a current pass through it
Answer:
So, when an electrical charge passes through a resistor, some of that electrical energy is transferred into heat, increasing the temperature. This extra energy causes the particles in the resistor to vibrate more. With these particles moving more, it is more difficult to for the electrons to move through the resistor.
Which of the following statements is
true?
A. If an object has mass, it's gravity is zero.
B. If an object has mass, it has gravity.
C. If an object has mass, it's weight is zero.
D. If an object has mass, it's weight is less than zero.
In what areas is the Big Bang theory inadequate or weak?
explain the forces of that affect the soccer balls path.
Answer:
yeah its correct
Explanation:
As the ball spins, friction between the ball and air causes the air to react to the direction of spin of the ball. ... Therefore, when a soccer player kicks the ball right of center the ball spins counter-clockwise and the Magnus force acts left, causing the ball to curve left.
All electrical devices must have two of what
Answer:
a voltage source and a conductor.
Explnation:
All electric circuits have at least two parts: a voltage source and a conductor. The voltage source of the circuit
5) What advice would you share with your colleagues about the pandemic
Answer:
Advice on how to stay safe and have fun during the pandemic becuase most people are in lockdown and they are having trouble trying to have a fun but they can
Velocity is speed with ?
To answer this question click the blank, then click the word in the word bank.
Word Bank:
A:Direction
B:slope
C:acceleration
Answer:
A. Direction
Explanation:
Velocity is the speed of something heading in a certain direction. If speed or direction changes, the velocity changes.
Why does your boat float but not your ring?
The air that is inside a ship is much less dense than water. That's what keeps it floating! ... The closer the total density of the ship is to the density of the same volume of water, the greater the amount of the ship that will be in the water.
Can someone explain what is referred by the cross sectional area of a solenoid? Is this the same for an air solenoid vs a solenoid with a solid core vs a solenoid with a hollow core?
Answer:
the cross section refers to the way in which it is wound, in general to the circle
circle does not depend on what it has inside
Explanation:
A solenoid is a wire wound in general in a circular shape, even when it is not forced, the cross section refers to the way in which it is wound, in general to the circle and is joined to determine the area
A = π r²
This circle does not depend on what it has inside, that is, it is the same section in the air, in a liquid or with a solid inside,
Can someone tell me what all these mean in pe pls I’m confused on what they mean all of them
Hello Dudes!
Pls help me in these 2 easy questions!
a. Define speed.
b. State its SI unit.
c. Write the formula for speed.
Answer:
speed is distance covered by body at certain or per time.
SI unit m/s
formula:
speed =distance covered/time taken
Acceleration occurs when an object changes its_ or _or both
Answer:
Acceleration occurs when an object changes its VELOCITY or DIRECTION or both
Explanation:
The EMF does not depend on which of the following?
A. The magnetic field strength
B. The number of electrons in the magnetic field
C. The velocity of the wire in the field
D. The length of the wire in the magnetic field
Answer:
Explanation:
When a wire of length L is moved with velocity v , perpendicular to magnetic field B , EMF will be produced at its two ends . EMF can be calculated with the help of following expression
EMF = BLv
As per this formula , EMF produced will not depend upon number of electrons in the magnetic field.
So B is the right choice.
can anybody help me please?
Answer:
1,2,5
Explanation:
How is speed related to kinetic energy?
Answer:
K.E. = 1/2mv^2
Explanation:
v is velocity (a vector) not speed (a scalar) but they have the same magnitude
A 0.70kW vacuum cleaner is used for 20 minutes. How much energy does it use? Give your answer in
kWh to two decimal places.
20 minutes = 20/60 = 0.33 hr
0.7 kw * 0.33 hr = 0.231 kWh = 0.23 kWh
Plz mark as Brill
Energy used will be 0.23 kWh
What is Energy ?Energy is the capacity of a physical system to do work . The standard unit of energy is Joule(J).
Energy = power * time
Given :
power = 0.70 kW
time = 20 minutes = 20 / 60 hour
Energy = ?
Energy = 0.70 * (20/60)
= 0.23 kWh
Energy used will be 0.23 kWh
learn more about Energy
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Which change happens in an endothermic chemical process??
Answer:
The thermal energy is absorbed
Explanation:
In an endothermic reaction, the products are higher in energy than the reactants. Therefore, the change in enthalpy is positive, and heat is absorbed from the surroundings by the reaction.
match this and give me please please
Answer:
1.) D
2.) E
3.) A
4.) B
5.)C
Explanation:
Identify what happens to the kinetic energy (KE) and gravitational potential energy (PE) of a rock as it falls.
KE and PE both increase.
KE and PE both decrease.
KE increases and PE decreases.
KE decreases and PE increases.
Answer:
KE increases and PE decreases.
Explanation:
POTENTIAL ENERGY (PE):
The potential energy of the rock depends upon the height of the rock, as given by the following formula:
P.E = mgh
Therefore, the potential energy will be highest at the initial point due to the highest height attained by rock. As the rock falls, its height will decrease as a result its potential energy will also decrease.
KINETIC ENERGY (KE):
The kinetic energy of the rock depends upon the velocity of the rock, as given by the following formula:
[tex]K.E = \frac{1}{2}mv^2[/tex]
Therefore, the kinetic energy will be zero at the initial point due to the zero velocity of the rock. As the rock falls, its velocity will increase as a result its kinetic energy will also increase.
Hence, the correct option will be:
KE increases and PE decreases.
A plane mirror forms an image of an object because it ____________ light from the object.
Answer:
reflect
Explanation:
In order to see the image of an object in a mirror, you must sight at the image; when you sight at the image, light will come to your eye along that line of sight.