Explanation:
A scalar is a value that has only magnitude.
A 4500-kg helicopter accelerates upward at 2.0 m/s^2. What lift force is exerted by the air on the propellers?
Using newtons second law .
[tex]\\ \sf\longmapsto Force=ma[/tex]
[tex]\\ \sf\longmapsto Force=4500(2)[/tex]
[tex]\\ \sf\longmapsto Force=9000N[/tex]
a solid copper sphere will sink in water while a hollow copper sphere of the same mass may float.explain this observation
Answer:
According to archemdes principle ,if an object displace more water that its volume then it will sink in water
As The hollow sphere of same mass have high volume ,so it will float and solid copper with less volume will sink ....
Explanation:
Plz mark me as brainliest ,I badly need it
9. The map shows the migratory range of the
Florida manatee, an endangered species. In
tracking manatees, biologists determine the
animals' range. Conservation groups can use
such data to support plans for protecting
manatees from powerboats, which injure and kill
many manatees.
According to the map, where would
conservation groups want to concentrate their
efforts by talking to boaters during the winter?
A. Georgia and Florida
B. Alabama and Florida
C. Georgia and Alabama
D. South Carolina and Florida
Answer:
I think it's B
I hope it helps u
10. Scientists try to develop an explanation for what
they see happening in the natural world. What
must be true of any explanation they develop?
A. It must be supported by evidence.
B. It can never be changed.
C. It must be shown to have practical value for
humans.
D. It must be based on information that other
scientists have also gathered.
Answer:
it must be based on information that other scientists have also gathered
Answer:
hope its ok
Explanation:
Science is a way of learning about what is in the natural world, how the natural world works, and how the natural world got to be the way it is. It is not simply a collection of facts; rather it is a path to understanding.so it should contain a logical theory but it can also never be said as the final answer.
so A) OR D) both are correct
Which of the following is true about galaxies?
a. Galaxies are moving away from each other.
b. Galaxies are moving toward each other.
c. Galaxies move in a random pattern.
d. Galaxies are stationary.
Answer:
Galaxies move in a random pattern.
Answer:
a
Explanation:
the universe is expanding
i remember learing this
hope this helps
brailest plzz
I need help on this question
Is the following statement an observation or an inference? "The house collapsed at the same time that the poles fell down." Explain
Answer: Observation (≧▽≦)
Explanation: An observation is what you noticed. That being said i noticed "The house collapsed at the same time that the poles fell down." //Hope this helped ≧▽≦//
The temperature of the universe is gradually ____ (The answer is not a number)
Answer:
its decressing, or getting colder
Explanation:
hope this helps
branilest plzz
Determine the units of the quantity described by each of the following combinations of units:
a. kg (m/s) (1/s)
b. (kg/s) (m/s^2)
c. (kg/s) (m/s)^2
d. (kg/s) (m/s)
WE have that the unit of the quantities are described
a.kg (m/s) (1/s)=Newton
b. (kg/s) (m/s^2)=None
c. (kg/s) (m/s)^2= Power in Watt
d. (kg/s) (m/s)=Newton
From the question we are give the units
a.kg (m/s) (1/s)
b. (kg/s) (m/s^2)
c. (kg/s) (m/s)^2
d. (kg/s) (m/s)
a)
Generally
kg (m/s) (1/s) is Represented as Newton
Where Newton is the unit Force and Weight
b)
Generally
(kg/s) (m/s^2) is the unit representation of No function
Therefore
None
c)
Generally
(kg/s) (m/s)^2 is the unit representation of Power in Watt
Therefore
Watt
d)
Generally
(kg/s) (m/s) is the unit representation of Newton
Where Newton is the unit Force and Weight
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1. A body has a velocity of 72 km/hr. Find its value in m/s.
72 Km/hr
= 72000 m/ 60×60 s
= 72000 m/ 3600 s
= 20 m/s
Answer is 20 m/s.
Hope it helps! Please do comment
A car accelerates from rest at 6.6 m/s^2. How much time does it need to attain a speed of 7 m/s?
explanation:
Here,
initial velocity(u)=0m/sfinal velocity (v)=7m/sacceleration (a)=6.6m/s²time(t)=?Using Formula;
v = u + at
or, 7 = 0 + (6.6*t)
or, 7 = 6.6t
or 7/6.6 = t
or, t = 1.06s
I think it will help you....
you run from your house to a friend's house that 3 miles away. you then walk home. A. What distance did you travel? B. What was the displacement for the entire trip?
Peter drives 150 meters in 18
seconds. Assuming he does not speed
up or slow down, calculate his speed.
[tex] \large \mathfrak{Solution : }[/tex]
Distance = 150 meters
Time = 18 seconds
Speed :
[tex] \dfrac{distance}{time} [/tex][tex] \dfrac{150}{18} [/tex][tex] \dfrac{25}{3} [/tex][tex]8.33 \: \: m/s[/tex]Which one is not physical quantity question is mistake
Answer:
Length
Explanation:
Answer:
length
hope it helps you
When dropped from rest, any object will fall a total distance of 19.6 m in the first 2 seconds of its fall. How far
does the object fall just during the 2nd second (i.e., from time t= 1 s to t = 2 s)?
Answer: The acceleration due to gravity increases the velocity of a falling object by 9.8 m/s per
second. Answer B is wrong because velocity increases. Answer C is wrong because the
distance increases every second. Ans. E is wrong because the derivative of distance with
respect to time gives the velocity, not the acceleration.
Explanation:
What is F = m x a in Newton's laws of motion?
Answer:
This is Newton's second law.
Newton's second law text:
(If a resultant force acts on a body, then an acceleration will give it an acceleration, the magnitude of which is directly proportional to the amount of the net force, and a direction is in the direction of the net force itself)
F=ma
net force = mass x acceleration
I hope I helped you^_^
help me please i dont understand
1) How many valence electrons are in the alkaline earth metal family? Do
they form cations or anions?
A)
1 valence electron, cations
B)
1 valence electron, anions
C)
2 valence electrons, cations
D)
2 valence electrons, anions
Answer:
Below
Explanation:
Alkaline earth metals have 2 valence electrons, which means that when they react with other elements, they will lose rather than gain their 2 electrons making them positive ions or cations.
So the correct answer to your question would be....
C) 2 valence electrons, cations
Hope this helps! Best of luck <3
After using soap to wash dishes by hand, if is sometimes difficult to keep your hands from remaining stick. Explain why rinshing your hand in lemon juice would make then less slick
A diagram shows how gravity on Earth works on an object located in different spots in a seaside community. Where is gravity between Earth and an object the strongest?
A when the object is on the highest branch of a pine tree
B when an object is at sea level
C when the object is on top of a nearby mountain
D when the object is on top of a telephone pole
Answer:
B) when an object is at sea level
Explanation:
Answer:
When the object is at sea level
Explanation:
convert 300 k into Celsius scale
Answer:
Given, kelvin temperature = 300 K
C = K – 273.15
C = 300 – 273.15
C = 26.85
Therefore, 300 Kelvin is equal to a celsius temperature of 26.85 °C
Hope this helps u
4.
Which of the following statement is correct
The density of an object does not remains same if we take small quantity of that substance.
The density of an object remains same irrespective of its shape, size and quantity.
The density of an object does not remains same irrespective of its shape and size.
The density of an object remains same only if its shape and size remains same.
The density of an object remains same irrespective of its shape, size and quantity.
Explanation:
Density is an intensive property. This means that regardless of the object's shape, size, or quantity, the density of that substance will always be the same. Even if you cut the object into a million pieces, they would still each have the same density. It is because density in an intensive property of matter.
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What is the difference between a hypothesis and a theory?
Answer:
a hypothesis is an assumption made before any research has been completed for the sake of testing (basically what you think is going to happen). A theory is an explanation for what has been shown many times. (what happened with evidence)
Explanation:
a plane is traveling at 250 m/s north after being in the air for 1 hour, what is the displacement?
Answer:
900,000 meters of displacement.
Explanation:
250x60x60 because it is meters per second and needs to be converted to a full hour.
What is the final velocity of a dragster that travels 400 meters from the start line
to the finish line in 5 seconds? *
Answer:
80m/s
Explanation:
The formula for velocity is [ v = s/t ] where s = displacement and t = time.
= 400/5
= 80m/s
Best of Luck!
A compass works because its magnetic needle
a. contain atoms
b. contain charged particles
c. repels magnet
d. spins freely
Answer
c. repels magnet
what is practical machine?
Explanation:
A practical machine is a simple machine that losses energy and have parts that have weights, friction and it causes some loss of work done.
At the scene of an accident, a police officer notices that the skid marks of a car are 10m long. The officer knows
that the typical deceleration of a car when skidding is 45 m/s?. What can the officer estimate for the original
speed of the car?
Answer:
30 m/s
Explanation:
0^2= Vi^2+ 2 (-45)(10)
The original speed of the car is equal to 30m/s which can be calculated from the third equation of motion.
What is the equation of motion?Equations of motion explain the basic concept of motion such as the position, velocity, or acceleration of an object several times. These three equations of motion can be governed by the motion of an object in 1D, 2D, and 3D.
There are three equations of motion that can be used to find displacement(s), velocity (v or u), time(t), and acceleration(a). The third equation of motion can be represented as follows:
v² = u² + 2aS
Given, the car is deaccelerated by 45m/s².
The distance covered by the car before it stops, S = 10 m
The final velocity of the car, v = 0 as it comes to rest.
We have to calculate the initial velocity of the car by using the third equation of motion:
(0)² = (u)² + 2 (-45) × (10)
u²= 900
u = 30 m/s
Therefore, the original speed of the car is 30 m/s.
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A stone falls from the top of a building and hits the ground at a speed of 32 m/s.
The air resistance force on the stone
is very small and may be neglected.
Calculate the time of fall.
Answer:
Explanation:
first you would need the height of the building in meters then using the formula calculate 32 m/s ÷ the height of the building in meters and you will get your answer
A car is running at a constant speed of 25m/s when the driver sees a child's sped of 20m a head he applied a break a car is top in 50 minutes calculate the time to stop the car and accelaration
Answer:
Umm..... Sorry can't understand your question, too many grammar mistakez
1. State Newton's third law of motion and write any three applications of it
Answer:
1)When a bullet is fired from the gun with a certain force (action) as a reaction an equal and opposite force is exerted on the gun. 2)when you jump, your legs apply a force to the ground, and the ground applies and equal and opposite reaction force that propels you into the air.
Newton's Third law: when object A exerts force on object B, object B simultaneously exert oppositely directed force of equal magnitude on object A.
1)When a bullet is fired from the gun with a certain force (action) as a reaction an equal and opposite force is exerted on the gun.
2)when you jump, your legs apply a force to the ground, and the ground applies and equal and opposite reaction force that propels you into the air.
