Answer:
h = 38.41 m
Explanation:
Given that,
A ball is thrown horizontally from the top of a building and strikes the sidewalk after 2.8 s.
We need to find the height of the building. Let it is h.
Initial speed of the ball, u = 0
Using second equation of motion to find h as follows :
[tex]h=ut+\dfrac{1}{2}at^2\\\\\text{Put u = 0 and a = g}\\\\h=\dfrac{1}{2}gt^2\\\\=\dfrac{1}{2}\times 9.8\times 2.8^2\\\\=38.41\ m[/tex]
So, the building is 38.41 m tall.
A jet plane flies at a velocity of 200 m/s, east in still air. a) If it flies into a 20 m/s wind heading west, what is its velocity relative to the ground? b) If it flies into a 20 m/s wind heading east, what is its velocity relative to the ground?
Answer:
Explanation:
a) If it flies into a 20 m/s wind heading west
The wind blows against the velocity of plane
resultant velocity = 200 - 20 = 180 m /s
velocity relative to ground = 180 m /s
b ) If it flies into a 20 m/s wind heading east,
wind will support the velocity of plane
resultant velocity = 200 + 20 = 220 m /s .
velocity relative to ground = 220 m /s .
Answer:
so mas o menos
Explanation:
a) If it flies into a 20 m/s wind heading west
The wind blows against the velocity of plane
resultant velocity = 200 - 20 = 180 m /s
velocity relative to ground = 180 m /s
b ) If it flies into a 20 m/s wind heading east,
wind will support the velocity of plane
resultant velocity = 200 + 20 = 220 m /s .
velocity relative to ground = 220 m /s .
3 points
14. Even though the water in a filled bathtub may be at the same
temperature as water in a teacup, the water in the bathtub has more
because it contains a greater number of water
molecules.
Choose
convection
kinetic energy
thermal energy
potential
temperature
Page 3 of 4
Answer:
Potential
Explanation:
The water in the bathtub has more potential energy than that in the tea cup because it has a greater number of water molecules.
Mass is a parameter that is very instrumental in determining potential energy.
The potential energy of a body is the energy due to the position of that body.
Potential energy = mass x acceleration due gravity x height
Mass is the amount of matter in a substance. Water in the tub will have more mass and contain a greater number of water molecules there in.
Since potential energy is directly proportional to mass, then, it will have a greater amount of potential energy.
A car runs for about 10 years during its average useful life. If the odometer reads 120,000 miles at the end, what was the average speed of the car in mph
Answer:
12000 mph
Explanation:
Given that,
Distance read by the odometer = 120,000 miles
Duration of car, t = 10 years
We need to find the average speed of the car. Speed of an object is equal to the total distance covered divided by total time taken. So,
[tex]v=\dfrac{120000}{10}\\\\=12000\ mph[/tex]
So, the average speed of the car is 12000 mph.
Scientists say. "Lightning storms are caused due to friction
Answer:
Explanation:
I am assuming your question is "How are lightning storms caused?"
When tiny ice droplets bump into each-other while falling from the sky build up electricity and the cloud fills up with electrical charges. The lighter positevely charged particles are at the top part of the cloud and the heavier negatevely ones sink to the bottom part of the cloud. And once they grow big enough a spark is formed (Positives and negatives attract) just like static electricity but scaled up
This equation shows the reaction that occurs when calcium carbonate
decomposes. what type of reaction is it? CaCO3 + energy – CaO + CO2
a. endothermic
b. synthesis
c. replacement
d. exothermic
ADD ANSWER
+6 PTS
Answer:
a. endothermic
Explanation:
The reaction shown is an endothermic reaction. In such reaction, they require an input of energy.
Endothermic changes involves absorption of heat from the surrounding. The surrounding becomes colder at the end of the reaction. When heat is on the reactant side, it suggests a reaction that requires a considerable input of energy.How much does the force increase if each mass is doubled?
Answer:
The force will also double
Explanation:
ANSWER QUICK PLS!!
(04.02 MC)
Pam observed many small earthworms in the backyard of her house after a heavy rain. What most likely formed the earthworms?
Select one:
a. Rainwater that fell on stones
b. Wet mud in the backyard
c. Eggs of earthworms
d. Mixing of air and water
Answer:
c. Eggs of earthworms
Explanation:
The actual formation of earthworms is by existing earthworms laying eggs.
The other answers are all separate from earthworms, though they are all found in the area with the earthworms.
Answer:
C. eggs or earth worms!
Explanation:
I hope this helps and this is Correct!
Which image below is the best example of an exothermic reaction?
Answer:
ion
know man sorry
Explanation:
what does interval training involve
Answer:
Interval training is simply alternating short bursts (about 30 seconds) of intense activity with longer intervals (about 1 to 2 minutes) of less intense activity. For instance, if your exercise is walking and you're in good shape, you might add short bursts of jogging into your regular brisk walks.
Explanation:
Answer:
Interval training is simply alternating short bursts (about 30 seconds) of intense activity with longer intervals (about 1 to 2 minutes) of less intense activity. For instance, if your exercise is walking and you're in good shape, you might add short bursts of jogging into your regular brisk walks
Explanation:
A sledder is moving to the right across unpacked snow and skidding to a stop. Of the forces listed, identify which act upon the sledder
Normal
Friction
Gravity
Tension
Applied
Air Resistance
(More than two)or idk
When A slider is moving to the right across unpacked snow and skidding to a stop, forces act upon the slider are: Normal force, Friction force, Gravity force.
What is force?An object's push or pull is seen as exerting a force. The interaction of the objects produces push and pull. You can also use words like stretch and squeeze to describe force.
The definition of force in physics is: the push or pull on a mass-containing item changes its velocity.
An external force is an agent that has the power to alter the resting or moving condition of a body. It has a direction and a magnitude. The application of force is the location at which force is applied, and the direction in which the force is applied is known as the direction of the force.
When a slider is moving to the right across unpacked snow and skidding to a stop gravitational force due to his weight, normal reaction force and frictional resistance force will act upon the slider.
To find more about force, refer the link:
https://brainly.com/question/13191643
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* THE ANSWER IS D * Silicon (chemical symbol Si) is located in Group 14, Period 3. Which is silicon most likely
to be?
A. Soft, shiny, highly reactive metal
B. Soft, shiny, highly reactive nonmetal
C. Gaseous, highly reactive nonmetal
D. Metalloid with properties of both metals and nonmetals
Answer:
Hank u so much out don't know how much this rally
Explanation:
Silicon most likely a metalloid with properties of both metals and nonmetals. So, the correct option is D.
What is meant by metalloid ?A metalloid is defined as a substance having the properties which is intermediate between that of both metals and non-metals.
Here,
Silicon is classified as a metalloid, because it exhibits the properties of both metals and non-metals.
Silicon or Si is an element that is belonging to the group 14 and period 3 of the periodic table.
Silicon is not highly reactive, it reacts very mildly. It is a crystalline solid and is hard and and brittle. Silicon has a blue-grey metallic luster.
Silicon consists of only 4 valence electrons. Therefore, it can either accept or donate electrons in order to complete the octet.
Therefore, it is called as a metalloid.
Hence,
Silicon most likely a metalloid with properties of both metals and nonmetals.
To learn more about metalloid, click:
https://brainly.com/question/2548493
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What is the gravitational constant g?
Answer: In SI units, G has the value 6.67 × 10-11 Newtons kg-2 m2. The direction of the force is in a straight line between the two bodies and is attractive. Thus, an apple falls from a tree because it feels the gravitational force of the Earth and is therefore subject to “gravity”.
Explanation:
Earth is 1.5 ✕ 1011 m from the Sun. Neptune is 4.5 ✕ 1012 m from the Sun. How does the gravitational field of the Sun on Neptune (gSN) compare to the gravitational field of the Sun on Earth (gSE)?
Answer:
The gravitational field of the Sun on Earth is greater than the gravitational field of the Sun on Neptune.
Explanation:
From Newton's law of universal gravitation,
F = [tex]\frac{GMm}{R^{2} }[/tex] ............. 1
where F is the force, G is the gravitational constant, M is the mass of the bigger object, m is the mass of the smaller object and R is the distance between their centers.
Also, Newton's second law of motion state;
F = mg ................ 2
where F is the force, m is the mass and g is the gravitational force.
Equating 1 and 2,
mg = [tex]\frac{GMm}{R^{2} }[/tex]
⇒ g = [tex]\frac{GM}{R^{2} }[/tex]
Given that the distance between the Sun and Earth is 1.5 x [tex]10^{11}[/tex] m, then the gravitational field of the Sun on Earth,
gSE = [tex]\frac{GM}{(1.5*10^{11}) ^{2} }[/tex]
= [tex]\frac{GM}{2.25*10^{22} }[/tex] .................. 3
Given that the distance between the Sun and Neptune is 4.5 x [tex]10^{12}[/tex] m, then the gravitational field of the Sun on Neptune,
gSN = [tex]\frac{GM}{(4.5*10^{12}) ^{2} }[/tex]
= [tex]\frac{GM}{2.025*10^{25} }[/tex] ............. 4
Comparing equations 3 and 4, it can be observed that gSE > gSN.
The gravitational field of the Sun on Earth is greater than the gravitational field of the Sun on Neptune.
The Federalists and Anti-Federalists argued primarily over which issue?
Two cars, initially 12 meters apart, zip towards one another at the speeds shown. At what point will the collision occur? Explain how you arrived at your answer. Car A: 1.4m/s car B: 2.2m/s
Answer:
s₁ = 4.67 m from car A
Explanation:
Since, the cars are moving at a constant speed. Hence, we will apply the equation for uniform motion here:
s = vt
where,
s = distance covered
v = velocity
t = time taken
For Car A:
s₁ = (1.4 m/s)t
For Car B:
s₂ = (2.2 m/s)t
Because the time will be same at the collision. At collision the distance covered by Car A and Car B must be 12 m altogether. Hence:
s₁ + s₂ = 12 m
using values:
(1.4 m/s)t + (2.2 m/s)t = 12 m
t = 12 m/3.6 m/s
t = 3.333 s
Substitute this in the equation of s₁:
s₁ = (1.4 m/s)(3.33 s)
s₁ = 4.67 m from car A
Kepler-186f is an exoplanet that orbits a star other than the Sun. Its star is the red dwarf Kepler-186. It is the first planet to be discovered that orbits its star at a distance like Earth’s distance from the Sun. If Kepler-186f is approximately 5.4 x 1010 meters from Kepler-186, how long does it take for light from the star to reach the exoplanet? The speed of light is 3.0 x 108 m/s. It takes 3 minutes
Answer:
t = 180 s = 3 minutes
Explanation:
The formula for the uniform speed of any object or element is given as:
V = S/t
t = S/V
where,
S = Distance between star and exoplanet = 5.4 x 10¹⁰ m
V = Speed of the light = 3 x 10⁸ m/s
Therefore, using these values in the equation, we get:
t = (5.4 x 10¹⁰ m)/(3 x 10⁸ m/s)
t = 180 s = 3 minutes
Hence, the light must reach the exoplanet in 3 minutes.
Hallar la fuerza eletrica ejercida entre 2 cargas iguales de magnitud 1c separado en el aire una distancia de 1km Cual es el resultado? 1. (2,3*10^-8new) 2. (8,1*10^-6new) 3. (3,2*10^-8new)
Answer:
La fuerza eléctrica ejercida entre 2 cargas iguales de magnitud 1 C separado en el aire una distancia de 1 km es 9,000 N.
Explanation:
La ley de Coulomb se utiliza para calcular la fuerza eléctrica que actúa entre dos cargas en reposo. Es decir, esta ley permite predecir la fuerza electrostática de atracción o repulsión existente entre dos partículas según su carga eléctrica y la distancia entre ellas.
La fuerza eléctrica con la que dos cargas puntuales son atraídas o repelidas en reposo es directamente proporcional a su producto e inversamente proporcional al cuadrado de la distancia que las separa, expresada como:
[tex]F=k*\frac{q1*q2}{d^{2} }[/tex]
donde:
F es la fuerza eléctrica de atracción o repulsión. En el S.I. se mide en Newtons (N). q1 y q2 son lo valores de las dos cargas puntuales. En el S.I. se miden en Culombios (C). d es el valor de la distancia que las separa. En el S.I. se mide en metros (m). k es una constante de proporcionalidad llamada constante de la ley de Coulomb. Depende del medio en el que se encuentren las cargas. En concreto para el vacío k es aproximadamente 9*10⁹ N·m²/C² utilizando unidades en el S.I.En este caso:
q1= 1 Cq2= 1 Cd= 1 km= 1,000 mReemplazando:
[tex]F=9*10^{9} \frac{N*m^{2} }{C^{2} } *\frac{1 C* 1 C}{(1,000 m)^{2} }[/tex]
Resolviendo obtenes:
F= 9,000 N
La fuerza eléctrica ejercida entre 2 cargas iguales de magnitud 1 C separado en el aire una distancia de 1 km es 9,000 N.
How does warming ocean relate to climate change?
Bacchae when the water is warm it will evaporate and rain
it will lead to
icl melting
change in climate
change in temperature
change in weather
Answer:
As greenhouse gases trap more energy from the sun, the oceans are absorbing more heat, resulting in an increase in sea surface temperatures and rising sea level. Changes in ocean temperatures and currents brought about by climate change will lead to alterations in climate patterns around the world.
explain what you think is happening in this picture
Answer:
sorry, there is no picture, try re-uploading it with the pic
Explanation:
(AKS 3al) Which graph best represents a moving object in a state of equilibrium
Graph 1
Graph 3
Graph 2
Graph 4
A. Graph 4
o
B. Graph 2
O C. Graph 3
D. Graph 1
A car’s brakes decelerate it at a rate of -1.60 m/s2. If the car is originally travelling at 15 m/s and comes to a stop, then how far, in meters, will the car travel during that time?
If a Ferrari, with an initial velocity of 14m/s, accelerates at a rate of 60
m/s^2 for 4 seconds, what will its final velocity be?*
Answer:
254
Explanation:
use the formula "final Velocity- initial velocity / time = acceleration"
so "X - 14 /4 = 60"
60 x 4 = X - 14
240 +14 = X
X = 254
Answer:
Explanation:Explanation:
You drop a lead fishing weight and a filled water balloon. Which do you expect to fall faster?
I believe they should fall at the same pace.
if an earthquake has a velocity of 41 m/s and a wavelength of 225 meters.
what is the earthquakes frequency?
Answer:
Frequency = 5.49Hz
Explanation:
Given the following data
Velocity = 41m/s
Wavelength = 225m
[tex] Velocity = wavelength * frequency [/tex]
Making frequency the subject of formula, we have;
[tex] Frequency = \frac {wavelength}{velocity} [/tex]
Substituting into the equation, we have;
[tex] Frequency = \frac {225}{41} [/tex]
Frequency = 5.49Hz
Therefore, the frequency of the earthquake is 5.49 Hertz.
please help!!!!!!!!!!
Answer:
D
Explanation:
Whats the cell that’s based on that persons sex
Answer:
gamete i think
A farmer is walking through a field at a
velocity of +0.5 meters per second (m/s)
relative to the ground. At the same time, he
is throwing seeds in front of him at a
velocity of +2.1 m/s relative to himself.
What is the velocity of the seeds relative to
the ground as they travel through the air?
Answer:
The velocity of the seeds relative to the ground as they travel through the air is V = +2.6 m/s
Explanation:
Let V be the velocity of the seeds relative to the ground, v be the velocity of the seeds relative to the farmer and v' be the velocity of the farmer relative to the ground.
By vector addition, V = v + v'
Since v = the velocity of the seeds relative to the farmer = +2.1 m/s and
v' = the velocity of the farmer relative to the ground = +0.5 m/s
Then,
V = v + v'
V = +2.1 m/s + (+0.5 m/s)
V = +2.6 m/s
So, the velocity of the seeds relative to the ground as they travel through the air is V = +2.6 m/s
you are flying on an airplane and you overhear two pasengers comment that flight attendants must be very skiled, one says "when the flight attendants pour coffee they must take into account the forward motion of the airplane and pour the coffee in frount of the cup so that it will land in the cup." The other passenger replies, "flight attendants must have to study the laws of motion as part of their training!" What would Isaac Newton say about this conversation? Ik that was long but ill make it worth a lot of points for your trouble.
How do you get out of a room with only a mirror and a table?
Look in the mirror you see what you saw, use the saw to cut the table, half and half makes a hole, jump in it.
Thought you would like that.
Please help me..........
Answer:
2nd one Force
Explanation:
Without a source of force and object won't have the capability of moving.
Answer:
force
Explanation:
pushing something forward
describe how you would see the apple in the dark.