Answer:
The average speed can be calculated as the quotient between the distance travelled and the time needed to travel that distance.
To go to the school, he travels 2.4 km in 0.6 hours, then here the average speed is:
s = (2.4km)/(0.6 hours) = 4 km/h
To return to his home, he travels 2.4km again, this time in only 0.4 hours, then here the average speed is:
s' = (2.4 km)/(0.4 hours) = 6 km/h.
Now, if we want the total average speed (of going and returning) we have that the total distance traveled is two times the distance between his home and school, and the total time is 0.6 hours plus 0.4 hours, then the average speed is:
S = (2*2.4 km)/(0.6 hours + 0.4 hours)
S = (4.8km)/(1 h) = 4.8 km/h
Why the impact of the loaded truck on a body coming it’s the way is very large even if the
truck is moving slowly
Answer: due to large momentum
Explanation:
The impact of the loaded truck is very large on a body coming in its way because of the momentum associated with truck. Truck has a huge mass which is responsible for its large momentum.
Momentum is the product of mass and velocity. Even though the velocity of truck is low but it's mass compensates for it to give large momentum. This large momentum can overwhelm any small body at rest or coming in its way.
An electric field of 6.1x 10^5 N/C is directed along a charge 2.9 x 10^-19 C. What
is the electric force on the charge?
Answer:
Electric field is a function 1/r^2
Explanation:
What must happen for salt and water to form a solution?
O A. The salt and the water must combine to form a new substance.
B. The salt and the water must combine chemically.
C. The water must displace the salt.
O D. The salt must dissolve in the water.
A lens is used to produce a virtual image that is smaller than the object the lens must be a _________ lens.
Question 21 options:
convex
diverging
converging
positive
Answer:
Its a Diverging Lens(concave lens)
Answer:
diverging lens
Explanation:
what is instanteanous velocity of the bat at t = 5 s
3. Identify which of the following probably would not have an effect on the climate of a region:
a. the region is next to a mountain range
b. the region is on the equator
c. a thunderstorm just blew through the region
d. the region is next to the Atlantic Ocean
why would your weight be different in space compared to on earth? please use mass and gravity in your explanation
whats going on here ??
My auestion is !
Write the value and unit of gravitational constant G in SI units?
Give me a answer for a short question !
What is the magnitude of the resultant of two forces 20 Newton and 15 Newton at 90 degrees to each other
Answer:
the magnitude of the resultant of two forces is 25 N.
Explanation:
Given;
first force, F₁ = 20 N
second force, F₂ = 15 N
the angle between the two forces, θ = 90⁰
The resultant of these two forces is obtained by applying Pythagoras theorem;
R² = F₁² + F²
Where;
R is the resultant force
R² = 20² + 15²
R² = 625
R = √625
R = 25 N
Therefore, the magnitude of the resultant of two forces is 25 N.
can someone please help me answer these questions
Answer:
the First one i think is D: it increases
The second i think it is B
i think
Explanation:
La contaminación acústica de acuerdo a la organización mundial de la salud medido en decibeles corresponde
Answer: Si es mayor a 65 dB es considerado dañino.
Explanation: Se considera ruido a todo aquel que supera los 75 dB o torturante aquel mayor a 120 dB según la OMS.
A short horizontal line leads to a small circle, which then has a longer line point up at about 45 degrees. A gap in the horizontal line that led to the circle ends with another small circle and then a short horizontal line segment. In a circuit diagram, what does this symbol represent? a resistor a light bulb a battery a switch. and the answer is D!!!!!!
Answer:
the answer is D
Explanation:
Answer:
The answer is D
Explanation:
yes
kinetic energy what is formula
As you move from left to right across the electromagnetic spectrum in the image, the wavelength becomes?
A.) Longer
B.) Lower
C.) Shorter
D.) Taller
Answer:
It is A.) Longer
Explanation:
The shortest wavelength is on the (high energy)left side of the diagram with gamma rays. The longest wavelength waves are radio, around 3 meters. so, as you progress, the wavelengths get longer.
Question 33
Why can human ears hear dolphins' vocalizations while under the water but cannot hear them well on land?
A
The waves in the water travel faster and at a higher frequency than they travel on land.
B
The waves in the water travel faster and at a lower frequency than they travel on land.
C
The waves in the water travel slower and at a higher frequency than they travel on land.
D
The waves in the water travel slower and at a lower frequency than they travel on land.
Answer:
A. The waves in the water travel faster and at a higher frequency than they travel on land.
Explanation:
The main reason why human ears can hear dolphins' vocalizations while under the water but cannot hear them well on land is because water is denser than air and air particles travel faster in denser particles.
Denser particles also ensures that the frequency of the waves move faster which in turn produces a faster and louder result.
the diagram below represents the orbits of earth, comet temple-tuttle, and planet x, another planet in out solar system. arrows on each orbit represent the direction of movement. which objects orbit would have and eccentricity close to 1?
Answer:
the most elliptical orbit is that of COMETA
Explanation:
The eccentricity of a curve in defined as the ratio between lacia to the focus, called c and the value of the axis greater than
ε = c / a
if we use Pythagoras' theorem
c = [tex]\sqrt{a^2 - b^2}[/tex]
substituting
ε = [tex]\sqrt{1 - (b/a)^2 }[/tex]
if ε = 0 we have a circumference
In the diagram presented the orbit of the comet is an ellipse a> b
ε=[tex]\sqrt{1- x} \\ x = (\frac{b}{a} )^2[/tex]
if we expand in series
ε = 1 - x/2
ε= [tex]1 - \frac{1}{2} \ (\frac{ b}{a} )^2[/tex]
if we neglect the non-linear terms
ε = 1
Earth's orbit is a small ellipse
b / a = 149 10⁶ / 151 10⁶
b / a = 0.98675
ε = [tex]\sqrt{1- 0.98675^2}[/tex]
ε = 0.16
a very small ellipse
Planet X, despite not having data, it seems that the sun is in the scepter of the orbit, so b = a
therefore both the semi-axes of the curve
e = a / b
Consequently, the most elliptical orbit is that of COMETA.
diferencias que existen entre la marcha cuando caminamos, corremos sin balón y corremos con balón
Answer:
La principal diferencia que existe entre la marcha cuando caminamos y cuando corremos, sea con o sin el balón, es la velocidad: al caminar, la velocidad es mucho menor que al correr, y a su vez, correr sin el balón da la posibilidad de correr mucho más rápidamente, debido a que no se requiere una coordinación entre los pasos y el control del balón.
Por otra parte, además de la velocidad, el ritmo cardiaco que se adquiere al caminar es mucho mas bajo que al correr, donde por causa del esfuerzo se aceleran las pulsaciones, aumentando la frecuencia cardiaca y, por lo tanto, la exigencia cardiovascular.
Un repartidor de comida rápida entrega una pizza a una casa que se encuentra a 20 km de distancia y se demora 20 minutos en llegar. De vuelta a la pizzería vuelve más relajado y se demora media hora. ¿Cuál fue su velocidad media en el trayecto completo?
Answer:
La velocidad media en el trayecto completo es 0.8 [tex]\frac{km}{minutos}[/tex].
Explanation:
La velocidad es una magnitud física que expresa la relación entre el espacio recorrido por un objeto y el tiempo empleado para ello.
En otras palabras, la velocidad es una magnitud que relaciona el cambio de posición (o desplazamiento) con el tiempo.
La velocidad media resulta del cociente entre el desplazamiento seguido por un móvil y el tiempo transcurrido que se emplea para realizar dicho desplazamiento:
[tex]velocidad=\frac{desplazamiento}{tiempo}[/tex]
En este caso, un repartidor de comida rápida entrega una pizza a una casa que se encuentra a 20 km de distancia y se demora 20 minutos en llegar. De vuelta a la pizzería vuelve más relajado y se demora media hora. Entonces, el desplazamiento total entre la pizzería y la casa será 40 km, considerando que se dirige a la casa y vuelve a la pizzería.
Por otro lado, el tiempo total será el tiempo en que se dirige a la casa y luego vuelve a la pizzería, es decir 20 minutos + 30 minutos= 50 minutos.
Entonces:
[tex]velocidad=\frac{40 km}{50 minutos}[/tex]
Resolviendo:
velocidad= 0.8 [tex]\frac{km}{minutos}[/tex]
La velocidad media en el trayecto completo es 0.8 [tex]\frac{km}{minutos}[/tex].
Given the electron configuration for the following neutral atoms A and B below:
Which statement is false?
(a) energy is required to change I to II
(b) I and II represent different elements
(c) I is the electron configuration of sodium
(d) less energy is required
to remove one electron from II than from I
Marvin lifts a box over his head. The work done on the box is- -Negative work -No work -Positive work
Answer:
Positive work
Explanation:
When work and the exerted force are in the same direction, then the work done is positive.
In the question, we understand that Marvin lifts a box up (i.e. over his head). The force to lift the box acts in the upward direction and the work done itself is also in the upward direction (from the floor to Marvin's head).
Since these two are in the same direction, then we can conclude that the work done is positive.
Can anyone answer this science question NO LINKS !!!!
Answer:
it is certainly a as clearly a has the greater mass
Help please (20 pts) I think it's C
What does "think of concrete examples" mean?
A. It means you come up with as many examples as you can in five minutes.
B. It means your thinking is getting too stiff, like concrete.
C. It means you think about how you can imagine the problem as a concrete block.
D. It means think of a real-life example you can relate to that has to do with what you’re learning.
Answer:
I'm not sure it is c I'm sure it is d
The diagram shows a compressed spring between two carts initially at rest on a horizontal frictionless surface. Cart A has a
mass of 2 kilograms and cart B has a mass of 1 kilogram. A
string holds the carts together. After the string is cut and the
two carts move apart, the magnitude of which quantity is the same for both carts?
O inertia
O momentum
O velocity
O kinetic energy
A.2 kg
В.1 kg
Answer:
momentum
Explanation:
the impulse is equal for both carts, the momentum for both carts is zero both before the string is cut and after it is cut
After the string is cut and the carts move apart, the magnitude of momentum is the same for both carts. Hence, option B is correct.
What is Momentum?Momentum is the result of a molecule's mass and velocity. Being a vector quantity, momentum possesses both magnitude and the direction. As according to Isaac Newton's second equation of motion, the force applied on a particle is equivalent to the time change in velocity.
According to Newton's 2nd law, if a particle is exposed to a constant force for a specific period of time, the result of the force and time (referred to as the impulse) is equal to the difference in momentum. In contrast, hand, a particle's momentum is a measurement of the amount of time needed for a consistent force to put it to rest.
To know more about Momentum:
https://brainly.com/question/24030570
#SPJ2
What are the similarities and differences between hydraulic and pneumatic systems?
Answer:
Pneumatics use easily compressible gas like air or pure gas. Meanwhile, hydraulics utilize relatively-incompressible liquid media like mineral oil, ethylene glycol, water, synthetic types, or high-temperature fire-resistant fluids to make power transmission possible.
Explanation:
hope this helps
What most likely causes water to change from the liquid state to a gas in the water cycle?
A. energy from gravity
B. energy from the Sun
C. energy from moving water
D. energy from the Earth's core
[tex] \huge \mathcal{Answer࿐}[/tex]
The factor which is responsible for the conversion of water in liquid state into gaseous state in the water cycle is :
[tex] \mathrm{\hookrightarrow Energy\:\: from \:\: Sun} [/tex]
_____________________________
[tex]\mathrm{ \#TeeNForeveR}[/tex]
What would happen to your blood in space without a spacesuit?
Why is the sky blue in colour?
[tex] \huge\mathrm{Answer࿐}[/tex]
Our Atmosphere is full of freely subtended particles, and when light from sun strikes the particles then scattering occurs, in which blue colour is most scattered and hence causing Sky to appear blue .
Hope it helps !!
_____________________________
[tex]\mathrm{ \#TeeNForeveR}[/tex]
I WILL MARK BRAINLY BUT U NEED TO DO ALL 9 QUESTIONS KINETIC ENERGY LAB. What is your hypothesis (or hypotheses) for this experiment?
3. What methods are you using to test this for each) hypothesis?
Section II: Data and Observations
4. Locate the data and observations collected in your lab guide. What are the key results? How
would you best summarize the data to relate your findings?
Answer:
1.) The importance of the lab in this topic is to find how dense an object is, and if it can sink or float, and it is important to answer the question so you can find the mass and volume.
2.) My hypothesis for this experiment was that the more water in the water bottle would make the beanbag fly higher. Also the higher the bottle is dropped the further it would go.
3.) The methods that I used to test my hypothesis were dropping the bottle of water from a higher distance. Another method that I used to test my hypothesis was filling the bottle with more water, or dumping water out to make it heavier/lighter.
Explanation:
If the mass of an object on earth is 18 grams, what would the mass of the same object be in the Moon
Answer:
18 grams
Explanation:
The mass of an object is the object's fundamental property. It is the amount or quantity of mater in the object. Irrespective of the object's location or the gravitational force applied on the object, the mass of an object remains the same. In other words, the mass of an object is the same everywhere.
The mass should however not be confused with its weight which depends on the mass and the gravitational force applied on it.
In summary, whether on earth or in the moon, the mass of an object remains the same. If the mass of the object is 18 grams on earth, it will also be 18 grams in the moon.