Answer:
Weight is a measure of the force of gravity pulling down on an object. It depends on the object's mass and the acceleration due to gravity, which is 9.8 m/s2 on Earth. The formula for calculating weight is F = m × 9.8 m/s2, where F is the object's weight in Newtons (N) and m is the object's mass in kilograms.
Explanation:
Which of the examples below is an example of convection?
A)
rubbing your hands together.
B)
heating a fish tank.
basking in the sun.
D)
striking a match.
Un automóvil circula a una velocidad de 60 km/h durante 1 hora y 15 minutos, después se para durante 5 minutos y luego regresa hacia el punto de partida a una velocidad de 10 m/s durante 45 minutos. Halla: a) La posición final. b) La distancia recorrida. c) La velocidad media.
Answer:
(a) 48 km
(b) 102 km
(c) 48.96 km/h.
Explanation:
Assuming that at first, the car travels from point A to point B, then the cat returns from point B to point C.
As the car traveled from point A to point B in 1 hour 15 minutes with a speed of 60 km/h.
Using distance = speed x time, so
Distance traveled from A to B is
[tex]d_{AB}= 60 x 1.25=75[/tex] km [ as time = 1 h 15 min = 1.25 h]
Stop time at point B is 5 minutes.
For the return journey, from point B to C:
Speed = 10 m/s
Time = 45 minutes = 45 x 60 seconds = 2700 seconds
Distance traveled from point B to C is
[tex]d_{BC}=[/tex] 10 x 2700 = 27000 meters
as 1000 meters = 1 km, so
[tex]d_{BC}=[/tex] 27 km.
(a) The final position of the car from the starting point A is the distance between points A and C.
[tex]d_{AC}=[/tex]75 -27=48 km.
Hence, the car is 48 km away from point A.
(b) Total distance traveled,
[tex]d= d_{AB}+d_{BC}=[/tex]75+27=102 km.
(c) Total time taken
t= 1.25 hour + 5 minutes + 45 minutes
= 5/4 hour + 5/60 hour + 45/60 hour [ as 1 hour = 60 min]
=25/ 12 hours.
Total distance traveled, d= 102 km [ from part (b)]
Average speed = (Total distance traveled)/(Total time taken)
=102/ (25/12)= 48.96 km/h.
Hence, the average speed of the car is 48.96 km/h.
4. The chart shows melting and boiling points of
different substances.
Melting and Boiling Points
Substance
Alcohol
Formaldehyde
Nicotine
Benzene
Nitroglycerine
Melting Point ("C) Boiling Point ("C)
-114
78.2
-92
-19
-79
247
5.5
80
13.5
250
Which substance freezes at the lowest
temperature?
A. Alcohol
B. Nicotine
C. Formaldehyde
Answer:
The correct option is A
Explanation:
Firstly, it should be noted that the freezing point of a substance can be assumed to be melting point of that substance because a substance will normally change from liquid to solid (freezes) at the same point it changes from solid to liquid (melts). For example, water freezes at 0°C and also starts melting at 0°C.
Thus, the substance with the lowest melting point among the substances mentioned in the question is alcohol (ethanol) with the melting point of -114°C. Hence, ethanol also has the lowest freezing point thereby freezing at the lowest temperature.
What are the three stages of matter and how?
Answer:
Solid, Liquid and Gas
Explanation:
They are the 3 states or stages of Matter
State the career function of computer engineering
Answer:
Computer engineer duties include doing research on software and computer hardware. Designing and testing computer hardware components. Like processors, circuit boards, memory devices and routers. Writing and testing software mobile devices and computers.
Explanation:
Answer:
Computer engineer duties include: Conducting research on software and computer hardware. Designing and testing computer hardware components, such as processors, circuit boards, memory devices and routers. Writing and testing software for mobile devices and computers.
Explanation:
Intermolecular force is stronger than the kinetic energy in?
Answer:
If the average kinetic energy is greater than the attractive forces between the particles, a substance will not condense to form a liquid or a solid. If the kinetic energy is less than the attractive forces, a liquid or solid will form.
Explanation:
Un prisma rectangular de cobre, de base igual a 36 centímetros cuadrados y una altura de 10 cm se sumerge hasta la mitad por medio de un alambre en un recipiente que contiene alcohol ¿que volumen de alcohol desaloja?
La respuesta correcta es 180 centímetros cúbicos o 180 [tex]cm^{3}[/tex]
Explicación:
El primer paso para saber cuanto alcohol desaloja el prisma es calcular el volumen total del prisma. El volumen se puede encontrar usando la formula V (Volumen) = B (base) x h (altura). El proceso se muestra a continuación:
V = B x h
V = 36 [tex]cm^{2}[/tex] x 10 cm
V= 360 [tex]cm^{3}[/tex]
Finalmente, el volumen total del prisma debe dividirse en 2 considerando que solo la mitad del prisma fue sumergida y esta mitad equivale al volumen del alcohol desplazado.
360 [tex]cm^{3}[/tex] ÷ 2 = 180 [tex]cm^{3}[/tex]
El volumen de fluido desplazado es de 180 cm^3.
Sabemos que el objeto va a desplazar su propio volumen de fluido. Por lo tanto, necesitamos obtener el volumen del objeto a, este es el volumen del fluido que eventualmente será desplazado por el sólido.
El volumen del sólido es;
V = 36 cm^2 * 10 cm^2 = 360 cm^3
desde que se sumergió a la mitad, volumen de alcohol desplazado = 360 cm^3/2 = 180cm^3
Obtenga más información sobre el volumen: https://brainly.com/question/7932885
Halp meeeeeeeeeeeeeeeeee
Answer:
1º all
2º 1
3º 2
4º the same
Explanation:
Name 2 fundamental units of SI system except that of MKS system.
The others are:
Ampere
Mol
Candela
Answer:
Ampare mole candelahope it is helpful to you
plz help i really need this
Answer:
The reactivity of metals increases as you move left in a period and as you move down in a group, so Marie needs to know the period and group of the element inside each box. Boxes that show locations in groups 1 or 2 or in period 8 contain the most reactive elements.
Explanation:
Answer:
The Group Number of the elements.
Explanation:
If Marie knew the group number of the elements, then she could determine the amount of valence electrons each element has and their reactivity rate. For example, if one box tells her that an element is located in group 18, then she could determine that the element is not very reactive. This is because elements in group 18 have 8 valence electrons, which makes them stable/unreactive.
Hope this helps!
In order for convection to transfer heat, particles need to
absorb solar and fossil energy
circulate and move within a liquid or gas
make contact with the heat source
transmit electromagnetic waves
Answer:
the answer is b as cenvection only occurs through movement of liquids and gases
Explanation:
Answer:
the answer is b
an athlete of mass 70kg runs at a velocity of 6ms5-1 calculate the kinetic energy of the athlete.
It takes 50 seconds for Tyler to do 450 Joules of work. How much power did Tyler use?
Answer:
Power = 450 Joules / 50 seconds = 9 J/s = 9 W *average* power
Explanation:
Power = Energy / Time ( or Work / Time) just as Velocity = Distance / Time
So, the average power needed for 50 seconds to do 450 Joules of work is simply 450 J / 50 s = 9 J/s = 9 Watts (The unit Watt is defined so that 1 Watt = 1 Joule / Second). It's important to note that 9W is the *average* power. The problem does not say that Tyler does work at a constant rate, so it's worth adding that caveat to the answer!
If a 50 N force was applied to a really massive object as well as a tiny object, what can you say
about the object's acceleration?
Answer:
The tiny object's acceleration will be much greater.
Explanation:
Because of Newton's second law of motion, (which is F=ma or Force= Mass*acceleration), then if the force maintains the same (which in this case it does, because it says 50 N to both obejcts) and one mass was much greater than the other, then the ould be less for the more massive object and much greater for the lighter object.
For example: If 50 N were applied to a 500 kg object and a 50 kg object, then theformulas for each (respectively) are:
50 = 500*acceleration
and
50 = 50*acceleration
(Because of Newtons Second Law of Motion)
Then, solving for the equations, we get for equation 1:
Acceleration = .1 m/s^2
And for equation 2:
Accleration = 1 m/s^2
Thus, you can see that more massive objects (when applied he same amount of force as the smaller object) clearly have less accleration than the smaller objects.
Dorji weight 1500n.if the total surface area of soles of his feet is 0.5 m2 what is the pressure exerted by his body on the ground
Answer:
P = 3000 Pa
Explanation:
Weight of Dorji, W = F = mg = 1500 N
The total surface area of soles of his feet is 0.5 m²
We need to find the pressure exerted by his body on the ground. The pressure is equal to the force acting per unit area. So,
[tex]P=\dfrac{1500\ N}{0.5\ m^2}\\\\=3000\ Pa[/tex]
So, the pressure exerted by his body on the ground is 3000 Pa.
Which event happens FIRST in the presidential election process?
A. The president is chosen by popular vote.
B. Americans vote for electors.
C. All 50 governors prepare their states' Certificates of Ascertainment.
D. Congress gathers to count the electoral votes.
You travel from Point A to Point B to Point C. What is your
displacement?
7 m
3 m
4m
5 m
12 m
Answer:
12m is your displacement
Answer:
5
Explanation:
Its a shortcut from A to C........I think
the velocity of a car changes from 5 m/s to 20 m/s in 30 sec the acceleration?
Answer:
0.5m/s2
..............
Kinetic energy is the energy an object has due to its
Answer:
potential energy or stored energy
Explanation:
Answer:
Motion
Explanation:
Edge2021
how can you show that pressure increases with the increase of force?
Answer:
...........................
If a bicyclist travels at 15 km/hr, how long will it take her to travel 30 km?
Answer:
The answer is 2 hoursExplanation:
To find how long it took we use the formula
[tex]t = \frac{d}{v} \\ [/tex]
d is the distance
v is the velocity
From the question we have
[tex]t = \frac{30}{15} \\ [/tex]
We have the final answer as
2 hoursHope this helps you
A space shuttle travels around the Earth at a constant speed of 28000 kilometers per hour. If it takes 90 minutes to complete one orbit, how far is its journey around Earth?
42000 kilometers
Explanation:
distance is velocity × time
28000 ×1.5
42000
remember to match units
thats why i wrote 1.5 hours instead of 90minutes
The convection zone is the outer most layer of the suns blank hot gases rise and then blank hear the loops form by singing cool gas causes blank to move towards the sun surface
Answer:
Explanation:
The sun is made up of 6 parts. Namely:
The coreThe radiation zoneThe convection zoneThe photosphereThe chromosphere and The coronaThe convection area is just above the radiation zone. As materials from the suns core are heated, they rise above the radiation zone towards the EDGE of the convection area then sinks back again into the radiative zone for more heat.
The radiative zone is 12.6 million Fahrenheit hot and is just above the core.
The core of the son is not solid but plasma whose motion is like gas. Its temperature stands at 48 million Fahrenheit
Cheers
activity 1 more or less, pls answer this ASAP
Answer:
ididate is a good one and
A motorcyclist sees a branch in the road and hits the brakes, slowing down at -6.42 m/s. if it takes him 2.85 seconds to stop, what was his starting velocity?
Use the definition of average acceleration:
a = ∆v / t
If v is the starting speed, then ∆v = 0 - v, so solve for v :
-6.42 m/s² = (0 - v) / (2.85 s)
v = (6.42 m/s²) (2.85 s)
v ≈ 18.3 m/s
The rate of change in position at a given point in time
Answer:
Velocity
Explanation:
The rate of change in position at a given point in time is called velocity.
what was the temperature changes in Celsius degrees if it is
changed from 44°F to -56°F?
Answer:
so, the answer is 56 whole number if round it, or 55.6(round it to 10th decimal)
Explanation:
(formula, idk it is wrong or right) °C =°F - 32 then / 1.8000
44°F = 6.6666666667°C
-56°F = -48.888888889°C
So, if u want whole number as the answer
it is something like 6.6666666667°C + 48.888888889°C = 55.5555555557 °C
so, so, the answer is 56 whole number if round it, or 55.6(round it to 10th decimal)
What do signal trainees do
Answer:
A signal apprentice works for a rail company, learning the duties of a signal maintainer through on-the-job training and experience. As part of this apprenticeship, you work on a railway to assist a seasoned signal maintainer as they install, repair, inspect, and test signal equipment.
Explanation:
What important example, shown in the picture, is given regarding a real-life
connection to these elements?
Answer:
Explanation:
There is no picture!
PLEASE HELP ASAP I WILL GIVE BRAINLIEST!!
Answer:
Q1: I'm going to say the fence is a polarizing filter.
Q2: On the second question: (b). BTW, It's not a very well-phrased question (and I'm a particle physicist, so...)
Explanation:
Q1:
So... hard to say for sure the intent here without knowing what you've been learning in class, but a frisbee - being a flat disk - will only go through the fence if it is oriented as shown, much like polarized light will only go through a polarizing filter if the EM waves are polarized in the direction that they will pass through a polarizing filter.
Q2:
It's not a) because ALL waves require a source of energy.
b) is for sure true and is about energy transfer - mechanical waves need a medium (like water) but EM waves do not. (Early on they thought maybe there was a medium for EM waves... they called it "aether" ... but it was proven via the Michealson-Morley experiment that no the speed of light was an absolute constant - fundamental to special relatively - which meant that light did not travel in any medium!)
(c) - depends on what you mean by "vibration", but yeah... EM waves result in varying electric fields for an observer. However, nothing to do with energy transfer per se (except that those varying fields are what transfer energy to objects that experience them...)
(d) - As above, the speed of light is a constant - cannot change speed ever *in a vacuum*. However, the speed of light is different in various materials, and can be bent (refracted) or reflected, which means the fields change direction in interacting with matter, although they do not change speed or direction "on their own" (in a vacuum). Similarly, mechanical waves can change speed or direction when there are changes or discontinuities in the media they travel in. So, arguably about energy transfer (the direction and speed related to the direction and rate of energy transfer) but not really different between EM and mechanical waves.
Anyway, like I said, it's not a very clear question, so YMMV with my advice here, but (b) is for sure the best single choice.