Answer:
D.
Explanation:
There are three physical properties of matter that involves solid, liquid and gas.
The last statement is correct as it says: boiling and melting points are similar as both changes the physical state of matter. But are different as boiling point changes liquid into gas for example: liquid at high boiling point changes into vapors (gas) and melting point changes solid into liquid for example: ice at high melting point changes into liquid.
Hence, the correct option is "D".
If Emily tries to jump over a narrow river at the speed of 6 m/s
at angle 30° to the horizontal, then the total flight time will be
seconds.
Answer: 0.6
Explanation: I'm doing the projectile motion problem solving and I was stuck but I guessed and choose that answer and it said I was correct.
A boy is holding a ball 1 m from the ground with a force of 20 N. He holds it still for 60seconds. How much power in watts is being used in this situation?
Answer:
Power = 0.33 Watts
Explanation:
Given the following data;
Distance = 1m
Force = 20N
First of all, we would solve for the work done by the boy.
Workdone = force * distance
Substituting into the equation, we have;
Workdone = 20*1 = 20J
Now to find power;
Power = workdone/time
Power = 20/60
Power = 0.33 Watts.
Explain the principles of work in physics.
What is the frequency of a wave that has a period of 0.002 seconds?
Answer:
The frequency of a wave whose time period is 0.002 second is 500 Hz
Explanation:
Given,
Time period of wave = 0.002 seconds
We know,
Frequency = 1 / Time period
Substituting the values;
= 1 / 0.002sec
= 1000/2
Frequency = 500Hz
Hence,
The frequency of a wave whose time period is 0.002 second is 500 Hz
HELP ME, I WILL RATE 5 STARS AND I WILL HEART ANSWER.
Answer:
im going to guess the 3rd one
Explanation:
If you pay children in kindergarten to make things from modeling clay, and then stop, you may find that they are less willing to do it for nothing than they were before you ever started paying them. This is an example of?
Answer: overjustification
Explanation:
The overjustification effect is a situation that occurs when an incentive like prizes or money or prizes leads to the reduction in an individual's intrinsic motivation that is necessary in performing a task.
In this case, because the children are motivated by money, when the take doesn't involve money anymore, they may not be willing to do it.
Just like traditional film cameras, the small opening that allows light to pass through the lens of a digital camera is called the
Answer:
dsadadas
Explanation:
dadadda
by how much does the speed of a vehicle moving ina straight line change each second when it is accelerating at 2km/h/s? At 4 km/h/s ? At 10 km /h/s?
Answer:
At 2km/h*s it is changing speed every 2 seconds.
At 4km/h*s it is changing speed every 4 seconds.
At 10km/h*s it is changing speed every 10 seconds.
Two reindeer-in-training pull on a sleigh. Connie pulls with a force of 200 N at an angle of 20 degrees above the (positive) -axis, while Randolph pulls with a force of 800 N at an angle of 50 degrees ° below the positive) -axis. What is their resultant magnitude of the force on the sleigh?
Answer:
[tex]F_r \approx 978.3N[/tex]
[tex]\theta =44 \textdegree[/tex]
Explanation:
From the question we are told that
Connie pulls with a force of [tex]F_c=200 N[/tex]
At an angle [tex]\theta _c=20 \textdegree[/tex]
Randolph pulls with a force of [tex]F_R=800 N[/tex]
At an angle [tex]\theta _R=50 \textdegree[/tex]
Generally the horizontal axis can mathematically be represented as
[tex]f_x=f_ccos\theta _c+F_Rcos\theta _R[/tex]
[tex]f_x=200*cos20+800*cos50[/tex]
[tex]f_x=702.2N[/tex]
Generally the vertical axis can mathematically be represented as
[tex]f_y=f_csin\theta _c+F_Rsin\theta _R[/tex]
[tex]f_y=200*sin20+800*sin50[/tex]
[tex]f_y=681.24N[/tex]
Generally the resultant force [tex]F_r[/tex] is mathematically given by
[tex]F_r=\sqrt{f_x^2+f_y^2}[/tex]
[tex]F_r=\sqrt{702.1686119^2+681.2395832^2}[/tex]
[tex]F_r=978.3230731N[/tex]
[tex]F_r \approx 978.3N[/tex]
Generally the Direction [tex]\theta[/tex] of force is mathematically given by
[tex]\theta =tan^-^1(\frac{f_c}{f_y})[/tex]
[tex]\theta =tan^-^1(\frac{681.23}{702.16})[/tex]
[tex]\theta =44 \textdegree[/tex]
Si se deja caer un carrito de una pista de coches sin friccion y su altura inicial es de 1.4 metros, cual es la velocidad maxima que puede alcanzar el carrito?
Answer:
[tex]5.241\ \text{m/s}[/tex]
Explanation:
m = Masa del coche
g = Aceleración debida a la gravedad = [tex]9.81\ \text{m/s}^2[/tex]
h = Altura = [tex]1.4\ \text{m}[/tex]
v = Velocidad del automóvil en la parte inferior de la pista
Aquí asumimos que el automóvil desciende verticalmente. La energía potencial del automóvil se completará convertida en energía cinética en la parte inferior de la pista ya que no hay pérdida de energía.
[tex]mgh=\dfrac{1}{2}mv^2\\\Rightarrow v=\sqrt{2gh}\\\Rightarrow v=\sqrt{2\times 9.81\times 1.4}\\\Rightarrow v=5.241\ \text{m/s}[/tex]
La velocidad máxima que puede alcanzar el coche es [tex]5.241\ \text{m/s}[/tex].
Help plzzz, if a question has more than one answer, pur both letters! Plzz I need 5 letters, this is the third time I’m posting this for help, someone plzzzz help!!
Answer:
1) e
2)c
3)b
4)d
i dont know if these are right, but something along these lines if you understand the pattern
Explanation:
How much heat is needed to warm up 10g of water from 10*C to 30*c
Answer: 10
Explanation:
A force is 10 and is used to move a box. It is moved a distance of 3 m. What is the work involved in moving the box?
Answer:
Workdone = 30Nm
Explanation:
Given the following data;
Force = 10N
Distance = 3m
To find the workdone;
Workdone = force * distance
Substituting into the equation, we have
Workdone = 10 * 3
Workdone = 30Nm.
Therefore, the work involved in moving the box is 30 Newton-meter.
The center of mass of a cow and the center of mass of a tractor are 208 meters apart. The magnitude of the gravitational force of attraction between these two objects is calculated to be 1.8 × 10-9 newtons.
What would the magnitude of the gravitational force of attraction be between these two objects if they were 416 meters apart?
A.
1.62 × 10-9 newtons
B.
3.6 × 10-10 newtons
C.
9 × 10-10 newtons
D.
4.5 × 10-10 newtons
Answer:
The magnitude of the gravitational force of attraction between the two objects when they are 416 meters apart is;
D. 4.5 × 10⁻¹⁰ Newtons
Explanation:
The given parameters are;
The distance between the center of mass of the cow and the tractor, r = 208 m
The gravitational attraction between the cow and the tractor = 1.8 × 10⁻⁹ N
The formula for finding the gravitational force, 'F', between the cow and the tractor is given as follows;
[tex]F =G\cdot \dfrac{m_{1} \cdot m_{2}}{r^{2}}[/tex]
Where;
G = The universal gravitational constant = 6.67408 × 10⁻¹¹m³·kg⁻¹·s⁻²
m₁·m₂ = The product of the mass of the cow and the tractor
Therefore, we have;
[tex]F = 1.8 \times 10^{-9} =G\cdot \dfrac{m_{1} \cdot m_{2}}{208^{2}}[/tex]
1.8 × 10⁻⁹ × 208² ≈ 7.78752 × 10⁻⁵ = G × m₁ × m₂
Therefore, when the distance between the two objects are 416 meters apart, we have;
[tex]F = \dfrac{G \cdot m_{1} \cdot m_{2}}{r^{2}} = \dfrac{7.78752 \times 10^{-5}}{416^2} = 4.5 \times 10^{-10}[/tex]
The magnitude of the gravitational force of attraction between the cow and the tractor when they are 416 meters apart, F = 4.5 × 10⁻¹⁰ N.
Question 7 (1 point)
An air mass exists off the Pacific coast of California. What type of air mass is this and
what are its main characteristics?
Choose ALL that apply
Lesson 1.07
Maritime
Polar
Continental
Polar
Maritime
Polar
Maritime
Tropical
Maritime
Tropical
Continental
Tropical
Maritime
Tropical
forms over warm water
warm, humid air mass
its a polar air mass
brings rainy or muggy weather
Answer:
Forms over water, warm humid air mass, it's a polar air mass
Explanation: I think that's right sorry if it's not..
GL! :)
What is your average resting heart rate?
Answer:
from 60 to 100.
Explanation:
Normal heart rates at rest: Children ages 6 - 15 70 – 100
Adults (age 18 and over) 60 – 100
In the image below, which region is showing an abnormally high sea level?
Color-coded map showing the height of the world's ocean surfaces at a particular time. Black areas correspond to 35 to 50 centimeters below normal. Blue areas correspond to 5 to 25 centimeters below normal. Gray areas correspond to 0 centimeters above or below normal. Yellow areas correspond to 5 to 15 centimeters above normal. Red areas correspond to 25 to 35 centimeters above normal. In this map, area A is colored blue, area B is colored yellow, area C is colored red, and area D is colored gray.
A
B
C
D
According to the information provided, the area showing abnormally high sea level is area C.
How to identify the area the highest sea level?To identify the area of the sea with the highest level, we must take as a reference the colors of each region and to what parameters each one corresponds.
In this case we have a map with areas painted in blue, yellow, red and gray, that is, there are areas with the following characteristics.
Area A (blue) has levels 5 to 25 centimeters below normal.Area D (grey) has levels 0 centimeters above or below normal.Area B (yellow) has levels 5 to 15 centimeters above normal.Area C (red) has levels 25 to 35 centimeters above normal.Learn more about maps in: https://brainly.com/question/1670085
Answer:c
Explanation:test
Which shows zero as significant digits? Check all that apply.
0.02
7.560
O 430
0 604
O 70,230
Answer:
Explanation:
0.02
0.604
70,230
becuase if you take away the 0 then it would change the value of the number
describe how an electromagnet can be switched on and off.
Answer:The magnetic field around an electromagnet is just the same as the one around a bar magnet. It can, however, be reversed by turning the battery around. Unlike bar magnets, which are permanent magnets, the magnetism of electromagnets can be turned on and off just by closing or opening the switch.
What is the formula of the Ca^2+and F^1- ions when they come together?
Answer:
CaF₂
Explanation:
When calcium ions combine with fluoride ions calcium fluoride is formed.
The formula is ;
Ca²⁺+2 F¹→CaF₂
In this formula, Calcium ion has a charge of 2+ and the fluoride ion has a charge of 1-. Two fluoride ions are required to make the overall charge zero.
How Could The movements of objects across the sky have led people to the conclusion that earth is the center of the universe
Answer:
What we see in the sky
Where are they in the general context of the overview of the Universe?
With the naked eye, the main astronomical objects we can see are the Sun, the Moon, the stars, and some of the planets
All of the stars we see are in the Milky Way galaxy, most of them relatively close to the Sun.
The stars we see in the sky come in a range of brightnesses, partly because stars come in different intrinsic brightnesses, and partly because some are closer than others.
When we look at an astronomical object ``by eye'', we can't tell just by looking how far away it is (because not all objects have the same intrinsic brightness). All we can see is what direction it is in.
As a result, when looking ``by eye'', the positions of stars on the sky are described by their direction only; you can imagine that the sky is a big sphere with astronomical objects located at different positions on it. This is called the celestial sphere
The positions of the stars can be described with a sort of astronomical longitude and latitude, called right ascension and declination.
Constellations are patterns of stars seen in the sky. However, although the stars in any constellation are all in the same general direction in the sky, the different stars in a constellation may be at very different distances from Earth, hence constellations may not be real associations of stars in space, just stars in the same general direction as seen from Earth.
Only the nearest galaxies are visible to the naked eye, as relatively faint smudges of light, although two of the very nearest galaxies, the Magellanic Clouds, are visible are moderately large clouds from the Southern hemisphere.
Motions in the sky
Hope this helps! :)
Neutrons can change the charge of an atom
True
False
Answer:
False. They can’t change the charge but they can change the mass
Please help with this question!!!!
Which is an indication that a man might be choking
Answer:
If they put their hands near their neck, if they're not breathing properly, if they aren't coughing.
Explanation:
Answer:
if they are struggling to breathe, attempting to cough (like coughing something up) or asking for help whilst holding their stomach, neck
A race car accelerates from 50 m/s to 75 m/s over a distance of 400 m. What is the race car's acceleration?
Answer:
[tex]a=3.90\ m/s^2[/tex]
Explanation:
Given that,
Initial velocity, u = 50 m/s
Final velocity, v = 75 m/s
DIstance, d = 400 m
We need to find the acceleration of the car. Let the acceleration of the car be a. We can use the third equation of motion to find it as follows :
[tex]v^2-u^2=2ad\\\\a=\dfrac{v^2-u^2}{2d}\\\\a=\dfrac{(75)^2-(50)^2}{2(400)}\\\\=\dfrac{3125}{2(400)}\\\\=3.90\ m/s^2[/tex]
So, the acceleration of the car is [tex]3.90\ m/s^2[/tex].
How do geologists construct the geologic column?
Answer:
They do this by joining pieces of different Rock sequences together from different places in the whole world.
Explanation:
Geologic columns are basically an arrangement of rock layers whereby the newest rocks are at the top while the oldest rocks will be at the bottom. Thus, it is like a timescale that's used to find the age of rock formation on the earth around the world.
it is easier to see clothes with pointed needle than a blunt one
Answer:
Explanation:
It is easier to see clothes with pointed needle than a blunt one because pressure exerted is more in a pointed needle as it occupies less space compared to blunt needle, A blunt has more surface area so the pressure exerted will less as compared to a pointed needle.
IF YOU FOUND MY ANSWER USEFUL THEN PLEASE MARK ME BRAINLIEST.
I WILL GIVE BRAINLIEST PLEASE HURRY
Evan examines a diagram of the rock cycle in his science textbook. He wonders how he can connect what he has learned about matter and energy to the rock cycle. Which statement explains what happens to material as it moves through the stages of the rock cycle?
Group of answer choices
A) New matter is being created all of the time.
B) The same matter is recycled over and over.
C) Eventually the broken-down matter disappears.
D) Old matter is destroyed and new matter takes its place.
Answer:
Hiii
The answer should be B)The same matter is recycled over and over.
External forces such as extreme weather pose a constant threat to the structural reliability of structures
Answer:
True
Explanation:
External forces such as extreme weather pose a constant threat to the structural reliability of structures.
Extreme weather conditions such as a high temperature or rainfall have an effect on structures due to the constant exposure of the structures to this factors. The materials used in building these structures have different properties which are usually affected by environmental factors.
why has SI system been developed?? give reason
plzz help i have exam tmr
Answer:
It allows people in different places and different countries to use the same units, avoid mistakes and understand each other more easily.
