Answer:
Decibel is used to determine noise level.
Which phrase best describes a machine?
any device that makes work easier
any device that moves an object
any device that has multiple parts
any device that uses energy
A book is sitting on a table. Which of the following is true about the table? O A. It is pushing up on the book. O B. It exerts no force on the book at all. O C. It is pulling down on the book. D. It can affect the mass of the book.
Answer:
yes it does exert a force, it pushes it up
Explanation:
this is called normal force
if it didn't exert a force the book would keep going down
according to newton every force has an equal amd opposite reaction
so the book exerts a force on the table and vice versa
hope this helped
A weight-lifter raises a 2000 N weight through a vertical height of 2.0m in 0.80 s.
What useful power does he develop in doing this?
A
800 W
B
3200W
с
4000 W
D
5000W
Answer:
D. 5000W
Explanation:
Given the following data;
Force = 2000N
Distance = 2m
Time = 0.8s
To find the power;
First of all, we would determine the workdone by the weightlifter
Workdone = force * distance
Workdone = 2000 * 2
Workdone = 4000N
Now, we can find the power using the formula;
Power = workdone/time
Substituting into the equation, we have
Power = 4000/0.8
Power = 5000 Watts
If the force exerted by a man is halved and the distance is multiplied by four, by which factor does the work change ?
A. Increase by a factor of 8
B. Decrease by a factor of 2
C. Increase by a factor of 2
D. Increase by a factor of 4
increase factor by 8 thousands
how can understanding velocity help to prevent a mid-air collision
Answer:
To maintain enough time to prevent a collision, a system operating in air traffic where aircraft speed does not
fall below 100 km/h (most medium-sized UAVs and GA aircraft) will need to be able to detect obstacles which
subtend an arc-width of as small as 0.125 mra
How much work did he do if he traveled 20 meters?
A flight distance from philadelphia to cancun is 1469 miles.the estimated flight time is 3.25 hours.What is the avarage speeede of the plane in miles per hour(number and units)?
Answer:
1469 miles /3.25 hours = 452 miles per hours
Explanation:
divide distance by the time it takes to get there
what is Schwartzchild radius??
no copied answers plz
Answer:
Schwarzschild radius is the radius of the boundary of a hole of this type.
Why does the first row in our periodic table
only have two elements?
A) because each orbital in every sub-level only holds
two electrons
B) because Bohr only knew about two elements
C) because the first energy level only holds two
electrons total
Help me plssss
Answer:
B
Explanation:
♡ ∩_∩
（„• ֊ •„)♡
┏━∪∪━━━━┓
Hopes this helps
♡ good luck 。 ♡
┗━━━━━━━┛
Answer:
C option is correct
Explanation:
C) because the first energy level only holds two electrons.
Help please!!! Physics circular motion
Answer:
2. 3.1415 m/s
3. 0.63m
4. 0.006 m/s^2
Explanation:
2. v=(2*pi*r))/T, put in values and solve.
3. Circumference=2*pi*radius, radius is 0.1m, plug in and solve.
4. a=(v^2)/r, (don't worry about converting to meters, since units are the same in kilometers, they will cancel out) plug in values and solve.
That's it!
The Berlin marathon is one of the fastest marathons courses; many world records have been set there. In 2014 Dennis Kimetto ran the 42.195 km in 2 hours, 2 minutes and 5 seconds. what was his average speed?
Answer:
about 2000 klm per min
Explanation:
F. A 50. A resistor (R2), and unknown resistor R2, a 120 Volt source, and an ammeter are connected in a
complete circuit. The ammeter reads 0.50 ampere (current).
R1
a. Determine the resistance of Rz.
R2
Complete question is;
A 50.-ohm resistor, an unknown resistor R, a 120-volt source, and an ammeter are connected in a complete circuit. The ammeter reads 0.50 ampere.
A) Calculate the equivalent resistance of the circuit shown.
B) Determine the resistance of resistor R shown in the diagram.
Answer:
A) R_eq = 240 Ω
B) R = 190 Ω
Explanation:
A) To get the equivalent resistance, we will use the formula;
R = V/I
Where;
V is Voltage
I is current
R is equivalent resistance
From the question, V = 120 V and I = 0.5A
Thus;
R_eq = 120/0.5
R_eq = 240 Ω
B) From the image, we see that the resistors are connected in series.
Formula for resistors in series is;
R = R1 + R2 +..... Rn
Thus;
240 = 50 + R
R = 240 - 50
R = 190 Ω
A) The equivalent resistance of the circuit shown will be 240 Ω.
B) The resistance of resistor R will be 190 Ω
What is resistance?Resistance is a type of opposition force due to which the flow of current is reduced in the material or wire. Resistance is the enemy of the flow of current.
The given data in the problem is;
R is the resistance = 50.-ohm
v is the voltage = 120-volt source
I is the value of the current =0.50 ampere.
A) The equivalent resistance of the circuit shown will be 240 Ω.
According to ohm's law
[tex]\rm R= \frac{V}{I} \\\\ \rm R= \frac{120}{0.5} \\\\ \rm R=240 \ ohm[/tex]
Hence the equivalent resistance of the circuit shown will be 240 Ω.
B) The resistance of resistor R will be 190 Ω
The given resistors are connected in the series;
R = R1 + R2 +..... Rn
240 = 50 + R
R = 240 - 50
R = 190 Ω
Hence the resistance of resistor R will be 190 Ω
To learn more about the resistance refer to the link;
https://brainly.com/question/20708652
Need help with this one question!
Answer:
Actual Mechanical Advantage
Explanation:
AMA=mg/F(applied)
An ohm is best described as a unit of measure for...
A. electrical resistance
B. electrical current
C. electrical potential difference
D. magnetic field strength
There is a small hole of radius r in a hollow sphere, which is immersed in a liquid. Upto what maximum depth it can be immersed so that liquid may not enter in it? Density of liquid is d and surface tension is T.
Answer:
h = 4T/dgr
Explanation:
Using Laplace law for spherical bubble, the pressure difference P'- P = 4T/r where T = surface tension and r = radius of sphere.
Now, the pressure difference on the hollow sphere P' - P = dgh where d = density of liquid, g = acceleration due to gravity and h = maximum depth to which sphere must be immersed.
So dgh = 4T/r
h = 4T/dgr
Elements with positive valences usually ______ electrons
A. Donate
B. Accept
C. Have no
D. Create
Skyscrapers are made of concrete and glass, concrete and glass are made of sand,so that makes skyscrapers giant sandcastles. Change my mind
Awnswer:
what are the answer chosices
Explanation:
Help me on this question
Please help me with this
Answer:
I can't really see it sorry
HELPPPP WILL MARK B IF CORRECT!!!!
Car A is stopped at a traffic light. At the moment it starts to move again, it is situated 330 m from car B, which is traveling in the opposite direction at a constant velocity of 18.0 m/s. If car A accelerates at a rate of 3.0 m/s^2, where and after how long will the two cars pass each
other?
Please answer this question with steps..
Answer:
hopr
Explanation:
Answer:
How do u delete your questions on this app
A rocket sled accelerates forward from 10 m/s to 50 m/s in 2 seconds. What is the acceleration of the sled?
Answer:
Explanation:
Use kinematics equations
You have Vi=10m/s and Vf=50m/s and t=2s
Use equation Vf=Vo+at 50=10+a(2)
50=10+2a
40=2a
a=20 m/s^2
PLS ANSWER FAST WILL GIVE BRAINLY!!!
In order for a roller coaster to work, why does the hill the cart climbs need to be higher than the top of the loop?
Answer:
The concept of potential energy, often referred to as energy of position, is very simple: As the coaster gets higher in the air, gravity can pull it down a greater distance. ... The potential energy you build going up the hill can be released as kinetic energy — the energy of motion that takes you down the hill.
Potential energy, also known as energy of position, is a pretty straightforward idea. As the roller coaster rises in the air, gravity has a greater ability to pull it down.
What does the hill the cart climbs need?An easy illustration involves a stopped car at the summit of a hill. The car drives faster as it goes down the hill, which results in an increase in kinetic energy and a decrease in potential energy. The vehicle changes kinetic energy into potential energy as it ascends the hill.
They are higher up at the top of the hill, thus they have more potential energy. Moving down a slope transforms potential energy into kinetic energy, while moving up a hill transforms kinetic energy into potential energy.
Therefore, You can release the potential energy you accumulate while climbing a hill as kinetic energy, which is the energy of motion that propels you down the hill.
Learn more about cart here:
https://brainly.com/question/7726236
#SPJ2
What is the limiting factor of speed for an object falling through the air?
⭐Air Resistance is the factor, which limits the speed of an object falling through the air...⭐
____________________________________________________
<Judge It Yourself...>
Hope it helps you! ヅ
✪ Be Brainly ✪
difference between sold and liquid
Explanation:
Solids have closely packed particles and vibrate about a fixed position, they also have a fixed volume.
liquid have close particles but which are able to move with a bit of kinetic energy, for this reason they have no fixed volume but take the volume of the container or vessel
How do you get on the cheer squad?!
Answer:
you don't cuz cheerleaders only get in the way of the football game
what is true about a pseudoscientific
Answer:
C: it ignores parts of the method within an investigation
rock at the edge of a cliff has kinetic energy because of its position.
True
False
its false rock is at edge
Each bat can produce different frequencies of ultrasound. Explain why this is useful if there are many bats hunting together.
Answer: Although low frequency sound travels further than high-frequency sound, calls at higher frequencies give the bats more detailed information--such as size, range, position, speed and direction of a prey's flight. Thus, these sounds are used more often.
Explanation:
From an apple tree 2 metres high, a 100g mass apple fell of the tree, what work did it do?
Answer:
When an apple falls from the tree to the ground, its energy of position (stored as gravitational potential energy) is converted to kinetic energy, the energy of motion, as it falls. When the apple hits the ground, kinetic energy is transformed into heat energy.