Select the correct answer.
A car traveling south is 200 kilometers from its starting point after 2 hours. What is the average velocity of the car?
А.
100 kilometers/hour south
B.
200 kilometers/hour
C.
200 kilometers/hour north
D.
100 kilometers/hour
Answer:
D) 100 kilometres/hour.
Explanation :
Given -
Displacement = 200 kmTime taken = 2 hrs.To find -
Average velocity of the car.Solution -
★ Velocity = displacement/time
→ V = 200/2
→ v = 100 km/h
Therefore, the average velocity of the car is 100 km/h.
what causes list development of a country ?why is Nepali still one of the least developed countries? write in points
Unlike secondary pollutants,
pollutants are
released directly into the air by natural processes or by human
activities
Answer:
True
Explanation:
Which land feature is formed by two oceanic tectonic plates diverging? *
mid-ocean ridge
volcanic island arc
continental volcanoes
continental mountain range
Answer:
mid-ocean ridge
Explanation:
When two oceanic tectonic plates diverge, it means they pull away from each other. When this happens, new land is created where the two plates moved apart.
Answer:
Mid-Ocean Ridge
Explanation:
Just trust me
(1) A block of mass 800g is pulled from rest on a horizontal
frictionless bench by a steady force of F and it travels 16m in 2
seconds. Find:
(a) The acceleration?
(b) The value of F?
Answer:
a) 8m.[tex]s^{-2}[/tex]
b) 6.4N
Explanation:
a)Using [tex]s=ut+1/2at^{2}[/tex]
s=16
u=0
t=2
a=?
16=1/2a(4)
a=8m.[tex]s^{-2}[/tex]
b) F=ma
Where m is in kg
Convert 800g to kg
800/1000=0.8kg (1000g in a kg)
F= 0.8 x 8 = 6.4N
A rock is thrown off a cliff with a horizontal velocity of 18.3 m/s. Right before it hits the ground, it has a vertical velocity of -31.3 m/s. What is the magnitude of the rock's overall velocity?
Answer: 36.257 m/s
Explanation:
The vertical and horizontal components of a projectiles motion are completely independent of each other. The only thing they share is the amount of time in the air. Because they are independent, the acceleration of gravity cannot affect the horizontal acceleration. This means horizontal acceleration is 0. If the acceleration is 0, this means the velocity does not change horizontally. So the final velocity of the x component is equal to the initial.
Now if you actually imagine these two vectors, it forms a right triangle. So you can use the Pythagorean Theorem to find the resultant vector.
[tex]a^2+b^2=c^2\\18.3^2+(-31.3)^2 = c^2\\c = 36.257 m/s[/tex]
How will you describe the motion of an object in a balanced and unbalanced
state? ASAP
Answer:
Objects move according to their net force, or the total amount of force acting on them. Balanced forces are just that, balanced. An object with balanced forces will not move because the opposing forces will cancel each other out. However, if there are unbalanced forces, the object will move in accordance with the force that is greater. When moving though, there is always friction. Whether you be underwater, on the ground, or in the air there is always friction on the Earth. (Besides vacuums, of course.)
Force is equal to mass x acceleration.
With that you can find the forces of the object if you know its mass and acceleration.
Explanation:
The motion of an object can be described in many ways, including path, speed, velocity, and acceleration.
How far will a 50 N crate be moved if 500 J of work are accomplished?
A dog walks a distance of 55.5 meters in 120 seconds. What was its speed?
A car travels 600 seconds at a speed of 25 m/s. How far did it go?
How long will it take a toy car to travel a distance of 1500 m at a speed of 3 m/s?
A car travels a distance of 9999 m in 3600s. What was its speed?
A sailboat travels a distance of 8080 m in 7200 seconds. What speed is it going?
What distance will a car traveling at a speed of 5.5 m/s cover in 0.25 s?
How long will it take a ball to roll 10 meters along the floor at a speed of 0.11 m/s?
Show work pls
Answer: ...
Explanation: 1: The dog is walking 0.4625MPS (Meters per second. M/S)
To calculate speed you divide the distance by time so 55.5 Meters/120 Seconds is 0.4625 MPS
2: The car traveled 15 KM
To calculate speed you need to multiply the speed by time. (Since it's multiplication it can be put in any order) So 600 Secondsx25 Meters is 15,000 M which is 15 KM.
3: It would take 8 Minutes and 20 Seconds to travel 1500 Meters.
To calculate the time you multiply Speed by distance (Order doesn't count.)
So 1500 Metersx3 MPS is 8 Minutes and 20 seconds.
4: It was going 2.7775 MPS.
To calculate the speed you divide the distance over time. So 9999 Meters/3600 seconds is 2.7775 MPS.
5: It was going 1.1222... (Infinite)
To calculate the speed you divide the distance over time
So 8080 Meters/ 7200 Seconds is 1.222...
6: It would cover 1.375 Meters.
To calculate the Distance you multiply Speed by time (Order doesn't count.)
So 10.25 Secondsx5.5 MPS is 1.375 Meters.
7: It would take 1 Minute and 31 Seconds to travel 10 Meters.
To calculate the time you multiply Speed by distance (Order doesn't count.)
So 10 Metersx0.11 MPS is 1 Minute and 31 seconds
Hopes this helps because this took over 10 minutes.
Acceleration
A car traveling to the right speeds up from Okm/h to 50km/h in 8s. Convert the time from seconds to minutes.
Explanation:
Initial speed, u = 0 km/h
Final sped, v = 50 km/h
Time, t = 8 s
1 minute = 60 seconds
⇒ 1 s = (1/60) minutes
⇒8 s = 0.1334 minutes
Acceleration,
[tex]a=\dfrac{v-u}{t}\\\\a=\dfrac{50\cdot\dfrac{5}{18}}{8}\\\\a=1.73\ m/s^2[/tex]
Hence, this is the required solution.
The heat felt when putting a hand near a light bulb this is an example of conduction, convection, radiation?
Answer:
conduction
Explanation:
Answer:
Radiation
Explanation:
Conduction: movement of something such as heat or electricity through a medium
Convection: movement in a gas or liquid in which the warmer parts move up and the cooler parts move down
Radiation: emission or transmission of energy in the form of waves or particles through space or through a material
Select all that change when adding or subtracting a Proton
Question 1 options:
Atomic Mass
Atomic Number
Charge
Which Element the atom is
I NEED ANSWER ASAP PLZ HELP!!!
Answer:
Explanation:
To the atomic mass;
1. Atomic mass is the number of protons + neutrons;
When a new proton is added, the atomic mass increases.
When a proton is removed, the atomic mass reduces
The mass of an atom is concentrated in the nucleus where there is the proton and neutron.
2. Atomic number is the number of protons:
When a new proton is added, the atomic number increases
When a new proton is removed, the atomic number reduces
3. Charge:
An atom is neutral if the number of positive charges is the same as negative charges:
Protons = electrons
If :
Protons > electrons = +Ve charges
Protons < electrons = -Ve charges
We can see Newton’s 3rd law everyday when what ?
Answer:
answer down below
Explanation:
hi! newton's third law applies to a lot of things. this is shown when we jump, bounce a ball, or push something, for example. the law states that for every action, there an equal and opposite reaction. when you bounce a ball, it bounces back up at the same force at which you dropped it.
hope this helps!
Placing ice on a sprained ankle this is an example of conduction, convection, radiation?
What is electronegativity? (2 points)
An atoms ability to attract other electrons and form a chemical bond
A type of electricity only found in some atoms
The total number of electrons in an atom
A property of electrons that give them a negative charge
Answer:
the first one
Explanation:
an atoms ability to attract other electrons and form a chemical bond
since other one got deleted :(
Electronegativity is an atom's ability to attract other electrons and form a chemical bond.
What is electronegativity?The tendency of an atom of a given chemical element to attract shared electrons (or electron density) when forming a chemical bond is known as electronegativity.
The electronegativity of an atom is affected by its atomic number as well as the distance between its valence electrons and the charged nucleus. The higher the associated electronegativity, the more an atom or substituent group attracts electrons.
Electronegativity is a simple way to quantify bond energy as well as the sign and magnitude of a bond's chemical polarity, which characterizes a bond along a continuous scale from covalent to ionic bonding.
Hence, electronegativity is an atom's ability to attract other electrons and form a chemical bond.
Learn more about electronegativity here:
https://brainly.com/question/17762711
#SPJ2
Which is an example of nuclear energy being converted into heat and light?
A a volcano
B The sun
C A rocket engine
D A coal burning power plant
Answer:
D. A coal burning power plantExplanation:
it is a coal power plant , nuclear power is economical and does not fluctuate as much as wind or solar power.
Unlike coal, it is considered clean in terms of the amount of greenhouse gas emissions produced by the power plant itself, although uranium mining and processing are not without risks and environmental impact
Does frequency of sound change with the temperature?
Answer: Temperature is also a condition that affects the speed of sound. Molecules at higher temperatures have more energy, thus they can vibrate faster. Since the molecules vibrate faster, sound waves can travel more quickly. The speed of sound in room temperature air is 346 meters per second.
Explanation: so basically, yes!
Describe the three particles that make up an atom (name, charge, and location in the atom).
Answer:Protons, neutrons, and electrons are the three main subatomic particles found in an atom. Protons have a positive (+) charge. An easy way to remember this is to remember that both proton and positive start with the letter "P." Neutrons have no electrical charge.
Vector L is 303 m long in a
205º direction. Vector M is
555 m long in a 105° direction.
Find the magnitude of their
vector sum
Answer:
584.32m
Explanation:
Firstly, we need to find the x and y components of each vector.
x-component for vector L=303cos205°=-274.61
y-component for vector L=303sin205°=-128.05
x-component for vector M=555cos105°=-143.64
y-component for vector M=555sin105°=536.09
Since it's the vector sum, we add the x and y components of each vector.
Resultant vector x-component -274.61+(-143.64)=-418.25
Resultant vector y-component -128.05+536.09=408.04
Now, to find the magnitude, we use the formula [tex]\sqrt{x^{2}+y^{2}}[/tex]
sqrt(-418.25^2+408.04^2)=584.32m
Check my work for errors just in case.
Billy, a mountain goat, is rock climbing on his favorite slope one sunny spring
morning when a rock comes hurtling toward him from a ledge 40.0 m above.
Billy ducks and avoids injury. a) How fast is the rock traveling when it passes
Billy? b) How does this speed compare to that of a car traveling down the
highway at the speed limit of 25 m/s (equivalent to 55 mi/h)?
Answer:
There is not enough information to solve how fast the rock was traveling
They are both very fast, as mountain goats are very fast, and if he ducks, he was faster than the rock. The speed compares
Explanation:
I did find this tho.
This question can be solved by using the law of conservation of energy.
a) The rock is traveling at "28 m/s" when it passes billy.
b) The speed of the rock is "1.12 times" the speed of the car.
a)
We can find the speed of the rock by using the law of conservation of energy:
Loss of Potential Energy = Gain in Kinetic Energy
[tex]mgh = \frac{1}{2}mv^2\\\\2gh = v^2\\v = \sqrt{2gh} \\\\[/tex]
where,
v = speed of the rock = ?
g = acceleration due to gravity = 9.81 m/s²
h = height = 40 m
Therefore,
[tex]v = \sqrt{2(9.81\ m/s^2)(40\ m)}[/tex]
v = 28 m/s
b)
Now, we find the ratio between the speed of the rock and the speed of the car:
[tex]\frac{speed\ of\ rock}{speed\ of\ car} = \frac{28\ m/s}{25\ m/s}\\\\speed\ of\ rock = (1.12)speed\ of\ car[/tex]
Learn more about the law of conservation of energy here:
https://brainly.com/question/20971995?referrer=searchResults
The attached picture explains the law of conservation of energy.
Which conversion can take place in a transformer?
Answer:
The correct answer is A.
Explanation:
Answer:
A. A lower voltage into a higher voltage
Explanation:
A P E X
how much time is required for an airplane to reach its takeoff speed of 77m/s if it starts from rest to average acceleration is 8.2 m/s
Answer:
t = 9.36 s
Explanation:
Given that,
Initial velocity, u = 0 (at rest)
Final velocity, v = 77 m/s
Acceleration of the airplane, a = 8.2 m/s²
We need to find the time required for an airplane to take off its speed 77 m/s. Let t be the time. using first equation of motion to find it as follows :
v=u+at
[tex]t=\dfrac{v-u}{a}\\\\t=\dfrac{77}{8.22}\\\\t=9.36\ s[/tex]
so, the airplane will take 9.36 seconds.
what is the number pattern for 7 12 17 22
Answer:
add 5 each number
Answer:
Increase by 5 each time.
Explanation:
What happens during the RESOLUTION of this story? A) Jonathan is feeling bored because his friend moved away. B) Jonathan and Mr. Browning start playing a game of chess. C) Jonathan kicks his soccer ball over a neighbor's fence. D) Jonathan sees a chess board set up on the back porch
Answer:
The resolution is when Jonathan finds a new friend in his neighbor after his other one moves away. (B).
Explanation:
Hope this helps
How far can a person run in 13.22 minutes if he or she runs at an average speed of 12.33 km/hr?
Answer:
2.72 km
Explanation:
(12.33 km)/ 1 hr * (1 hr)/ 60 min
0.2055 km/ min
distance=rate * time (assuming v is constant,
a=0)
(0.2055 km/ min)*(13.22 min)
2.72 km OR 2716.71 m
what is the kinetic energy of a 200kg boulder that has fallen 500m off a 1000m cliff ?
Answer:
Ek = 981000 [J]
Explanation:
To solve this problem we must use the principle of energy conservation, where kinetic energy is transformed into potential energy or vice versa. In this special case we take the reference level of potential energy in the soil (potential energy equivalent to zero). When the potential energy is zero, this energy has been transformed into kinetic energy and the velocity will be maximum.
[tex]E_{k} =\frac{1}{2}*m*v^{2}[/tex]
[tex]E_{p}=m*g*h[/tex]
where:
Ek = kinetic energy [J]
Ep = potential energy [J]
m = mass = 200 [kg]
h = elevation = 500 [m]
[tex]E_{p}= E_{k}[/tex] (energy conservation)
Ep = 200*9.81*500
Ep = 981000 [J]
And the kinetic energy is equal to:
Ek = Ep = 981000 [J]
The image below shows the same egg in water (on the left) and in seawater (on the right). What must be true about these liquids?
a
The seawater is less dense than the plain water
b
The seawater is denser than the plain water
c
The plain water and the seawater have equal densities
d
It is impossible to tell which liquid is denser
Answer:
C
Explanation:
the correct answer is C
List 3 objects that would sink in water & 3 object that would float in water :)
Answer:
items that would sink : spoon marbles rocks
Explanation:
items that would float : straw feather cotton
The gravitational force of the Earth on the Moon is 1.99 x 1020 N.
If the mass of the Moon is 7.34 x 1022 kg, what is the acceleration
of the Moon?
Explanation:
ANSWER
g
m
=
R
2
GM
1.4=
R
2
(6.667×10
−11
)(7.34×10
22
)
R=
1.4
6.667×10
−11
(7.34×10
22
)
=
34.95×10
11
=1.87×10
6
m
HOPE IT'S HELP AND PLZ FOLLOW ME
if you walk 8km at an average speed of 4km/h, how much time does it take
Answer:
2 hours
Explanation: