All of the following protects against flooding except (1 point)
a. dams
b. levees
c. flood sirens
d. evacuation
Answer:B
Explanation:
what do you mean by MA of lever is 2
Answer:
MA of a lever is 2. It means the lever can lift a load of 2 times heavier than the effort
A marble rolls across a table for 6 meters in 2.3 seconds. What is the
velocity of the marble?
Answer:
2.61 [tex]\frac{m}{s}[/tex]
Explanation:
v= d/t
v = 6m/2.3 s
v=2.61 [tex]\frac{m}{s}[/tex]
Answer:
[tex]\boxed {\tt v\approx2.61 \ m/s}[/tex]
Explanation:
Velocity can be found by dividing the displacement by the time.
[tex]v=\frac{d}{t}[/tex]
The displacement is 6 meters and the time is 2.3 seconds.
[tex]d= 6 \ m\\t= 2.3 \ s[/tex]
Substitute the values into the formula.
[tex]v=\frac{6 \ m}{2.3 \ s}[/tex]
Divide.
[tex]v=2.60869565 \ m/s[/tex]
Let's round to the nearest hundredth. The 8 in the thousandth place tells us to round the 0 to a 1.
[tex]v\approx2.61 \ m/s[/tex]
The velocity of the marble is about 2.61 meters per second.
Which of the following happens to an object in uniform circular motion?
A. it’s velocity changes
b. it’s speed changes
c. it’s centripetal acceleration changes
d. the direction of its velocity stays the same
Answer:its velocity changes
Explanation:
Halley's orbit is a very eccentric (stretched-out) ellipse, so at perihelion Halley's Comet is only about 90 million kilometers from the Sun, compared to more than 5 billion kilometers at aphelion. Does Halley's Comet spend most of its time near its perihelion distance, near its aphelion distance, or halfway in between? Explain.
what is another name for "motion energy"?
Answer:Kinetic energy
Explanation:
Rachel travels 100km in 5hrs. Find her AVERAGE SPEED. i need work shown too
Answer:
20kph
Explanation:
Since she travels 100kpm in 5 hours and 100 divided by 5 is 20 she would travel 20km in one hour
A 2-kg girl sits on a carousel 0.5 m away from the axis of rotation. If the centripetal force is 80 N, what is the
speed that maintains her circular motion?
Answer:
40M/S
Explanation:
BY CALCULATION USING THE FORMULA S=FD
roxy is driving down east capital. she drives 1380 meters in 45 seconds. assuming she does not speedup or slow down,what is her speed in meters per second ?
Answer:
30.66667
Explanation:
this should be it i did the math
You launch a model rocket that has a mass of 1 kg. At a height of 500 m, it is
traveling at 120 m/s. What is its kinetic energy at this point?
A. 60 J
B. 14,400 J
C. 7,200 J
D. 29 J
SUBMIT
Answer:
7,200 j
Explanation:
:) :)) :)) :) :)))
Answer:
c. 7,200 J
Explanation:
did the quiz <3
Can somebody plz answer this correct quickly!!!! :D
(WILL MARK BRAINLIEST)
(Use google idc)
Answer:
I think the answer is, Both humans and whale embryos have a tail and a backbone (I'm not sure).
Explanation:
This is because, both human and whale embryos have a tail and a backbone.
Hope this helps! :D
A motorbike is traveling to the left with a speed of 27.0 m s 27.0 s m 27, point, 0, start fraction, start text, m, end text, divided by, start text, s, end text, end fraction when the rider slams on the brakes. The bike skids 41.5 m 41.5m41, point, 5, start text, m, end text with constant acceleration before it comes to a stop. What was the acceleration of the motorbike as it came to a stop?
Answer:
The acceleration of the motorbike as it came to a stop was -8.78 m/s² (NOTE: Negative sign indicates deceleration)
Explanation:
From the question,
A motorbike is traveling to the left with a speed of 27.0 m/s.
This is the initial speed, that is, initial speed = 27.0 m/s
Also, from the question,
The rider slams on the brakes and the bike skids 41.5 m, that is, the bike covers a distance of 41.5 m after the rider slams on the brakes.
Distance = 41.5 m
To determine the acceleration of the motorbike as it came to a stop,
Since, the bike came to a stop, then, the final speed is 0 m/s
From one of the equations of motion for linear motion
v² = u² + 2as
Where v is the final speed (velocity)
u is the initial speed (velocity)
a is the acceleration
and s is the distance
From the question
v = 0 m/s
u = 27.0 m/s
s = 41.5 m
Putting these into the equation
v² = u² + 2as
0² = 27.0² + (2×a×41.5)
0 = 729.0 + 83a
83a = -729.0
a = -729.0 / 83
a = -8.78 m/s² (NOTE: Negative sign indicates deceleration)
Answer:
8.8 m/s^2
Explanation:
Khan Academy answer
Pls help me it do in 10 minutes !!!!!!
Answer:
473.28m/s^2
Explanation:
ac=4×9.86×75m/ 6.25 =2958m÷6.25=473.28 m/s^2<exponent
i hope this help
dont blame me if im wrong
im only 13 but :) tell me if im wong or not hehe after u know the answer
someone teach me this
Orange juice with pulp floating around is an example of what type of mixture?
Group of answer choices
heterogeneous mixture
homogeneous mixture
Answer:
I hope this helps
Explanation:
homogeneous mixture
When scientists replicate experiments they will often do so under different conditions than the original investigations. Why might this be helpful? Why do you think the astronaut replicated Galileo's investigation on the moon? -This is for science
Answer:
Scientists replicate other scientists' experiments to test if the result of the original investigations being tested should become a law, therefore, meaning if it should be generally accepted or discarded.
However, using different conditions than the conditions used in the original investigations is a method employed by scientists usually to:
1. Check if the values, equipment, used by the original investigations can give similar results if the values are lowered or increased and to also test if the result of the original investigations can be the same even if conditions are adjusted.
2. Check the accuracy of some experimental results especially when those original investigations are the first to speak about a new topic/finding. Definitely, other scientists would use different conditions to provide a broad knowledge and a general acceptance.
Galileo's investigation on the moon rejected popular beliefs of the content of the moon paved the way for further investigations by other astronauts. Galileo performed his investigations with equipment centuries back, coupled with the fact that his investigation didn't support an existing belief that paved the way for his investigation to be replicated by other astronauts.
A battery provides a potential difference of 14V. What size current will flow through a 10 ohm resistor in this circuit?
Answer:
I = 1.4 [amp]
Explanation:
To solve this problem we must use ohm's law, which tells us that the voltage is equal to the product of the current by the resistance.
Therefore:
V = I*R
where:
V = voltage = 14[V]
I = current [amp]
R = resistance = 10 [ohm]
I = 14/10
I = 1.4 [amp]
Which of the following characteristics do all unicellular organisms share?
Answer:
Asexual production they can be eukaryotes or prokaryotes
Explanation:
Acceleration occurs when an object changes its ____________________ or ____________________ or both.
Answer:
Acceleration occurs when an object changes its VELOCITY or DIRECTION or both.
Explanation:
Answer:
When the velocity of an object changes it is said to be accelerating. Acceleration is the rate of change of velocity with time. ... Acceleration occurs anytime an object's speed increases or decreases, or it changes direction. Much like velocity, there are two kinds of acceleration: average and instantaneous. answer velocity or direction.
hope this helps!
A disc is thrown through the air for 1.5 min with a power output of 12.5 W. How much work is done when throwing the disc?
Answer:
work = 1125 [J]
Explanation:
To solve this problem we must remember the definition of power, which is defined as the relationship between work and time. The power can be calculated using the following equation:
Power = work/time
Power = 12.5 [w]
work = joules [J]
time = 1.5 [min] = 90 [s]
work = 12.5*90
work = 1125 [J]
A car is accelerating at a rate of 35 m/s2 and has a resulting velocity increase from 17 m/s to 26 m/s. How long did it take to change its velocity?
Answer:The answer is (60 mph - 0 mph) / 8s = (26.8224 m/s - 0 m/s) / 8s = 3.3528 m/s 2 (meters per second squared) average acceleration. That would be 27,000 miles per hour squared.
Explanation:
How are electromagnetic waves used in bar-code scanners?
Answer:
A barcode reader (or barcode scanner) is an optical scanner that can read printed barcodes, decode the data contained in the barcode and send the data to a computer. Like a flatbed scanner, it consists of a light source, a lens and a light sensor translating for optical impulses into electrical signals.
Explanation:
A barcode reader (or barcode scanner) is an optical scanner that can read printed barcodes, decode the data contained in the barcode and send the data to a computer. Like a flatbed scanner, it consists of a light source, a lens and a light sensor translating for optical impulses into electrical signals.
Two 125 kg bumper cars are moving toward each other in opposite directions. Car X is moving at 10 m/s and Car Z at −12 m/s when they collide headon. If the resulting velocity of Car Z after the collision is 10 m/s, what is the velocity of Car X after the collision?
Mass of two bumper cars, m₁ = m₂ = 125 kg
Initial speed of car X is, u₁ = 10 m/s
Initial speed of car Z is, u₂ = -12 m/s
Final speed of car Z, v₂ = 10 m/s
We need to find the final speed of car X after the collision. Let v₁ is its final speed. Using the conservation of momentum to find it as follows :
[tex]m_1u_1+m_2u_2=m_1v_1+m_2v_2[/tex]
v₁ is the final speed of car X.
[tex]m_1u_1+m_2u_2-m_1v_1=m_2v_2\\\\m_2v_2=m_1u_1+m_2u_2-m_2v_2\\\\m_1v_1=125\times 10+125\times (-12)-125\times 10\\\\v_1=\dfrac{-1500}{125}\\\\v_1=-12\ m/s[/tex]
So, car X will move with a velocity of -12 m/s.
If the lift has a maximum power of 5000 W, how much time would it take the lift to
perform 35,000 J of work?
Answer:
T=35,000J/5000W=7s
Which statement most accurately describes the surface of steel?
Alex and Izzy are conducting an experiment to see what natural material could best be used for insulating pipes to keep them from freezing in the winter. What is the independent variable of their experiment?
A car rolls down a hill from rest and reaches a velocity of 18.0 m/s in a distance of 25.0
m. Find the acceleration of the cart.
Answer:
I’m so sorry I tried solving it but I don’t understand it can you explain the question a little bit more ty
Explanation:
how much work is done when a man uses a force of 400 N to push a car a distance of 50 metres
Answer:
The answer is 20,000 JExplanation:
The work done by an object can be found by using the formula
workdone = force × distanceFrom the question
force = 400 N
distance = 50 m
We have
work done = 400 × 50
We have the final answer as
20,000 JHope this helps you
In a museum exhibit, three equal weights are hung with
identical wires. Each wire can support a tension of no
more than 75.0 N without breaking. What is the maximum value
that W can be without breaking any wires?
A 50.0 N
B 25.0 N
C 75.0 N
D 35.0 N
Answer:(B) 25.0 N
Explanation:
This is what makes most since. You are wanting to look at the stress of the first wire. 25 *3 for the amount of balls handing of the string you get 75.0 N which is the max the top wire can hold without breaking! Hope this helps!
A force of 15 N is used to push a box along the floor a distance of 3 meters. Find the amount of work done.
Answer:
The answer is 45 JExplanation:
The work done by an object can be found by using the formula
workdone = force × distanceFrom the question
force = 15 N
distance = 3 meters
We have
work done = 15 × 3
We have the final answer as
45 JHope this helps you
you already know i dont have much time
Answer:
its option c the age of a fossil can be determined