Answer:
Our atmosphere is a mixture of gases that surround Earth. It is kept in place by the pull of Earth's gravity. If Earth was a much smaller planet, like Mercury or Pluto, its gravity would be to weak to hold a large atmosphere
Explanation:
What 3 factors should be considered when designing a lighting rod?
Explanation:
A lightning rod (US, AUS) If lightning hits the structure:-
It will preferentially strike the rod and be conducted to ground through a wire.
Instead of passing through the structure, where it could start a fire or cause electrocution.
The parts of a lightning protection system are air terminals (lightning rods or strike) and all of the connectors and supports to complete the system.
what will happen to satellite if the linear speed is reduced?. give a reason for your answer
Explanation:
If the satellite is moving too quickly then the gravitational attraction between the Earth and the satellite is too weak to keep it in orbit. If this is the case, the satellite will move off into space. This occurs at speeds around or above 11,200 metres per second (m/s).
Phecda has a surface temperature of approximately 9500 K and a luminosity of 63. Identify the name of the star found on the Characteristics of Stars chart in the 2011 Edition Reference Tables for Physical Setting/Earth Science that has a surface temperature and luminosity closest to Phecda. a) Deneb b) Rigel c) Sirius d) Pollux
Answer:
Sirius
Explanation:
On the HR diagram Sirius is the closet.
c) Sirius has a surface temperature and luminosity closest to Phecda
What is surface tension and luminosity of a star ?
Surface temperature is the temperature at or near a surface. Luminosity is an absolute measure of radiated electromagnetic power (light), the radiant power emitted by a light-emitting object over time.
As it can be observed from the graph attached that Sirius have a surface temperature of about 10,000 K which can be considered as closest to 9500 K comparatively to other stars and if we see the the y coordinate of Sirius which is the luminosity representing axis , then Sirius have a value of luminosity closer to 63
hence correct answer is c)Sirius
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Señala cual de las siguientes propiedades de una sustancia son propiedades características= masa densidad volumen belleza conductividad eléctrica
Answer:
i) densidad
ii) conductividad eléctrica
Explanation:
Las propiedades características de una sustancia se denominan también propiedades intrínsecas. Estas son propiedades que no dependen de la cantidad de sustancia presente.
Las propiedades características se pueden utilizar para identificar una sustancia porque son propiedades que siempre debe exhibir la sustancia.
Entre las opciones, podemos encontrar las siguientes sustancias características;
i) densidad
ii) conductividad eléctrica
The sun is located in
the Crab Nebula.
the Andromeda Nebula.
the Milky Way Galaxy.
the Snickers Galaxy.
Answer:
The sun is located in the Milky Way Galaxy.
explain the derivation of Newton's third and second law.
Answer:
Consider an isolated system of 2 bodies A & B. An isolated system means where there is no external force acting.Now let F be the force acting on B by A & F be the force acting on A by B.Now rate of change of momentum of A =dpA/dt and rate of change of momentum of B =d pB/dt
thus FAB=d pB/dt (i)......
FBA=dpA/dt (ii)........
Adding 1 and 2 we get FAB+FBA=d pB/dt+dpA/dt =d(pB+pA)/dt
But if no force is applied momentum will also be 0 because no velocity will be there so rate of change of momentum will also be 0
thus d(pA+pB)/dt=0
therefore FAB+FBA=0
or,FAB=-FBA
(3RD LAW OF MOTION)
when we put our finger in front a a lit flashlight, light appears to pass through our finger when seen on a wall,how?
Answer:
diffraction phenomenon
Explanation:
When you place your finger in front of a flash, you have a diffraction phenomenon whereby the light fills a part of the space with the first maximum diffraction.
In this case the phenomenon of geometric optics cannot explain the process of bending the beam around an object.
Spaceship 1 and Spaceship 2 have equal masses of 150 kg. Spaceship 1 has an initial momentum magnitude of 900 kg-m/s. What is its initial speed?
A. 9 m/s
B. 6 m/s
C. 90 m/s
D. 60 m/s
Answer:
ans: 6 m/s
Explanation:
spaceship 1 has mass= 150kg
initial momentum of spaceship 1 = 900 kg•m/s
we know,
momentum = mass × velocity
so,
velocity = momentum/mass
= 900 / 150
= 6 m/s
since we know it was initial momentum so, velocity is initial speed,
Atoms of two different elements must have different
electrical charges.
numbers of neutrons.
atomic numbers.
energy levels
Answer:
Number of neautrons
Explanation:
Atoms from two different elements may have the same number of neutrons, but never the same number of protons. The number of protons is unique to the element and represents the atomic number. (sorcastic.org)
Answer:
C.
Explanation:
A 500 kg sports car accelerates uniformly from rest reaching a speed of 30 m/s in 6 seconds .Find the distance travelled by the car in 6 second
Answer:
the distance traveled by the sports car is 90 m
Explanation:
Given;
mass of the sports car, m = 500 kg
initial velocity of the sports car, u = 0
final velocity of the sport car, v = 30 m/s
time of motion of the car, t = 6 s
The distance traveled by the sports car is calculated as;
[tex]s = (\frac{u+v}{2} )t\\\\s = (\frac{0+30}{2} ) \times 6\\\\s = 15 \times 6\\\\s = 90 \ m[/tex]
Therefore, the distance traveled by the sports car is 90 m
What is cerebellum ?
Is the path of light visible in a Suspension? Give reason.
Answer:
Answer:It is due to tyndall effect that the path of a light ray passing through a suspension is visible. The particles in suspension scatter the beam of light making it clearly visible.
Answer:
it is due to the Tyndall effect so the path of light is visible in a suspension but in solution the path of light is not visible
Magali exerts a force of 4.5 N to slide her Blackberry across the table (so she can hide it from Hina!). If she does 2.7 J of work in the process, how far has the Blackberry moved?
Work is equal to the magnitude of the force multiplied by the displacement x. Assuming Magali is pushing the phone, so that the force and displacement point in the same direction, then the work done is positive, and
2.7 J = (4.5 N) x ==> x = (2.7 J) / (4.5 N) = 0.60 m
Even if she was pulling the phone instead, the displacement would be the same, but the work done would be negative and the force would point in the opposite direction, thus also having a negative sign:
-2.7 J = (-4.5 N) x ==> x = 0.60 m
Two forces that make up 3rd law of motion can: 1)Act on the same object 2)do not act on same time 3)Act on different objects 4)Do not act oppositely
Answer:
3) Act on different objects
Explanation:
Newton's third law of motion states that for every action there is an equal and opposite reaction.
Action-reaction force pairs make it possible for fishes to swim, birds to fly, cars to move, etc.
Basically, action-reaction force pairs are characterized by the following statements;
I. The forces are the same type such as magnetic force, contact force or gravitational force.
II. The forces are equal in magnitude but opposite in direction.
III. They act up on two different bodies.
Hence, the two forces that make up 3rd law of motion can act on different objects.
For example, while driving down the road, a bug strikes the windshield of a vehicle (Action) and makes a quite obvious mess in front of the face of the driver of the vehicle (Reaction) i.e the bug hit the vehicle and the vehicle hits the bug.
What is gravitational force??
Answer:
the force of attraction between all masses in the universe
Explanation:
Have a nice day :)
Un automóvil se anuncia con una potencia de 600 hp y cuando se prueba en una subida pesada, alcanza una velocidad máxima de 45 km/h ¿cuál es la fuerza máxima que le imprime el motor?
Answer:
The force is 35808 N.
Explanation:
Power, P = 600 hp = 600 x 746 W = 447600 W
speed, v = 45 km/h = 12.5 m/s
Let the force is F.
P = F v
447600 = F x 12.5
F = 35808 N
For its size, the common flea is one of the most accomplished jumpers in the animal world. A 2.50-mm-long, 0.460 mg flea can reach a height of 15.0 cm in a single leap. a) Calculate the kinetic energy per kilogram of mass. b) If a 79.0 kg, 2.00-m-tall human could jump to the same height compared with his length as the flea jumps compared with its length, how high could the human jump
Answer:
1.47 J/kg
120 m
Explanation:
The maximum height it can jump in a single leap 15 cm, = 0.15 m
to get the kinetic energy per kg of mass, we need to find the takeoff speed. The take off speed can be calculated by using the formula
v = [tex]\sqrt{2gh}[/tex]
where h = 0.15
v = [tex]\sqrt{2 * 9.81 * 0.15}[/tex]
v = [tex]\sqrt{2.94}[/tex]
v = 1.715 m/s
energy per kg of mass =
1/2 * (1.715) = 1.47 J/Kg
TJe height a human can jump when compared to the flea is
2 m/2.5 mm * 15 cm =
2/0.0025 *0.15 =
800 * 0.15 = 120 m
a student places 8 similar coins in a pile . the height of the pile of coins is 2.4 cm calculate the average thickness of one coin
Answer:
0.3 cm
Explanation:
[tex] \frac{2.4}{8} \\ = 0.3[/tex]
Brian has an object suspended in the air. It has a mass of 100 kg and is 25 meters above the ground. What is the object’s potential energy?
Explanation:
the PE = Weight x g x Height above ground where g is the gravitational constant (9.8m/s^2)
so tge PE = 100 x 9.8 x 25 = 24500 J
Two closed organ pipe gives 4 beats when sounded together at 5°C. Calculate the number of beats in 35°C
Answer:
The number of beats is 10.58 in 35°C.
Explanation:
The beat frequency is given by : f₁-f₂
At 5°C, f₁-f₂ = 4
We need to find the number of beats in 35°C.
The frequency in a standing wave is proportional to [tex]\sqrt T[/tex].
So,
[tex]\dfrac{f_1-f_2}{f_1'-f_2'}=\dfrac{\sqrt {T}}{\sqrt{T'}}\\\\f_1'-f_2'=(f_1-f_2)\times \dfrac{\sqrt{T'}}{\sqrt{T}}\\\\f_1'-f_2'=4\times \dfrac{\sqrt{35}}{\sqrt{5}}\\\\f_1'-f_2'=10.58[/tex]
So, the number of beats is 10.58 in 35°C.
The speed of light in vinegar is 2.30 x 10^8 m/s. Determine the index of refraction. (2
Answer:
[tex]n _{v} = \frac{c}{v} \\ = \frac{3 \times {10}^{8} }{2.30 \times {10}^{8} } \\ = 1.30[/tex]
This question involves the concept of refractive index.
The refractive index of the vinegar is "1.3".
What is the Refractive Index?The refractive index is defined as the ratio of the speed of light in air and the speed of light in the given medium which is vinegar here.
[tex]\eta = \frac{c}{v}[/tex]
where,
[tex]\eta[/tex] = refractive index = ?c = speed of light in air = 3 x 10⁸ m/sv = speed of light in vinegar = 2.3 x 10⁸ m/sTherefore,
[tex]\eta = \frac{3\ x\ 10^8\ m/s}{2.3\ x \10^8\ m/s}[/tex]
η = 1.3
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The lower the pH number is, the more ______ the solution.
Answer:
more acidic (less base)
hope this helps! :)
Arches National Park is a desert landscape located in Utah. The park is filled with arches that have been formed by nature. The arches were once solid rock. Over time, extreme temperature changes and windy conditions have caused pieces of rock to crumble and blow away, leaving holes in the rock and forming the arches. Which of these processes is responsible for the formation of the arches?
a.cooling magma
b.weathering and erosion
c.compaction and cementation
d.increased geological pressures
If the distance between two objects is increased to four times the original distance.how will that increase change the force of attraction between the object
Answer:
Gravitational force becomes sixteen times lesser. The strength of the gravitational force between two objects is dependent on their mass. Gravitational force will be weaker if the objects move further away from each other.
This was used to solve for the gravitational force,
G = gravitational constant
m = mass of the first object
M = mass of the second object
d = distance between the two objects
[G * (m*M) / 16d^2] = 1/16
(2²)⁴pepelelellelrle
PLEASE HELP ME!
1. Figure 5.20 shows a graph of displacement against time for a wave.
(a) What is meant by amplitude?
(b) Determine the period of oscillation, T. Then, calculate the frequency of oscillation.
2. Compare and contrast progressive wave and stationary wave.
Answer:
a) A = 3 cm, b) T = 0.4 s, f = 2.5 Hz,
2) A standing wave the displacement of the wave is canceled and only one oscillation remains
Explanation:
a) in an oscillatory movement the amplitude is the highest value of the signal in this case
A = 3 cm
b) the period of oscillation is the time it takes for the wave to repeat itself in this case
T = 0.4 s
the period is the inverse of the frequency
f = 1 /T
f = 1 /, 0.4
f = 2.5 Hz
2) a traveling wave is a wave for which as time increases the displacement increases, in the case of a transverse wave the oscillation is perpendicular to the displacement and in the case of a longitudinal wave the oscillation is in the same direction of the displacement.
A standing wave occurs when a traveling wave bounces off some object and there are two waves, one that travels in one direction and the other that travels in the opposite direction. In this case, the displacement of the wave is canceled and only one oscillation remains.
what is the mathematical relationship among voltage current and resistance
Answer:
The relationship between voltage, current, and resistance is described by Ohm's law. This equation, i = v/r, tells us that the current, i, flowing through a circuit is directly proportional to the voltage, v, and inversely proportional to the resistance, r.
Con respecto a las magnitudes longitud del péndulo y periodo, ¿por qué la línea de mejor ajuste de los puntos-dato de la distribución indica que sí hay relación entre ambas magnitudes?
Answer:
Por que existe una relación entre dichas magnitudes.
Para un pendulo perfecto de largo L, sabemos que el periodo esta definido como:
[tex]T = 2*\pi *\sqrt{L/g}[/tex]
Donde:
pi = 3.14
L = largo del péndulo
g = aceleración gravitatoria = 9.8 m/s^2
Entonces podemos ver que el periodo es proporcional a la raíz cuadrada de la longitud del péndulo.
Esto es por lo que al analizar datos de un experimento se debería observar una relación entre esas magnitudes.
Mike roller skates with a constant speed of 10 miles per hour. How long will he take to travel a distance of 15 miles.
Answer:
So every hour he makes 10 miles. So he would take 1 and a half hours to go to Mcdonalds 15 miles away.
Explanation:
[tex]\huge\boxed{{\textsf{90 minutes}}}[/tex]
We know that Mike's speed is [tex]\dfrac{10\ \text{miles}}{60\ \text{minutes}}[/tex] since there are [tex]60[/tex] minutes in an hour, and we know that MIke needs to travel [tex]15[/tex] miles. We'll model this using fractions:
[tex]\dfrac{10\ \text{miles}}{60\ \text{minutes}}=\dfrac{15\ \text{miles}}{x\ \text{minutes}}[/tex]
We can see that there is a [tex]2:3[/tex] ratio here, so we'll divide the left fraction by [tex]2[/tex] and multiply it by [tex]3[/tex] to get the right fraction.
[tex]\dfrac{10}{60}\Rightarrow\dfrac{5}{30}\Rightarrow\dfrac{15\ \text{miles}}{\boxed{90\ \text{minutes}}}[/tex]
Ocean zones can be classified based on distance from Shore into intertidal,
costal ocean, and open oceans.
True or false ?
Answer:
I think true
Explanation:
I hope I'm right and I hope it helps
Answer:
true
Explanation:
basta yun yung sagot ko
