Answer:
Q = 78375 [J]
Explanation:
To solve this problem we must use the following ideal equation for the thermal energy of an element or substance depending on the temperature change.
[tex]Q=m*C_{p}*(T_{final}-T_{initial})[/tex]
where:
Q = heat [J]
m = mass = 0.25 [kg]
Cp = specific heat = 4180 [J/kg*C]
Tinitial = 25[°C]
Tfinal = 100 [°C]
[tex]Q =0.25*4180*(100-25)\\Q = 78375 [J][/tex]
how would our lives be different if we didnt have the technology based on the other parts of the EM Spectrum
Answer:
it would be horrible
Explanation:
yeah
What is the net work done to lift a 6 kg block a height of 5.3 meters and then lower it back to the ground where it started?
Answer:
636 J
Explanation:
The weight of the block is =mg = 6kg × 10 ms-2 = 60 N
Since it was raised and dropped back to it's original position, distance = 5.3 × 2 = 10.6 m
Work done = 60N × 10.6 m = 636 J
Name ten scalar quantity and explain them
Answer:
A scalar is a quantity that is fully described by a magnitude only. It is described by just a single number. Some examples of scalar quantities include speed, volume, mass, temperature, power, energy, and time.
Examples of scalar quantity are:
Distance.
Speed.
Mass.
Temperature.
Energy.
Work.
Volume.
Area.
Explanation:
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What is the resulting acceleration when a net force of 18 N is applied to a 3.0 kg mass?
The resulting acceleration is 6m/s^2 , when a net force of 18 N is applied to a 3.0 kg mass.
Fnet = 18N
m= 3kg
Fnet = ma
18 = 3a
6m/s^2 = a
What is acceleration ?"Acceleration is the rate of change of the velocity of an object with respect to time. Accelerations are vector quantities. The orientation of an object's acceleration is given by the orientation of the net force acting on that object."
What is force ?"A force is an influence that can change the motion of an object. A force can cause an object with mass to change its velocity, i.e., to accelerate. Force can also be described intuitively as a push or a pull. A force has both magnitude and direction, making it a vector quantity."
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A toy rocket fires its engines to launch it straight up from rest. After a short time, the engine turns off and the
rocket continues before falling back to the ground. The velocity - time graph for the rocket's complete
journey is shown
At what time after launch does the engine turn off?
Answer:
at 10 seconds.. b/c that's when the velocity stops increasing..
Explanation:
3. a stone thrown up is caught by the thrower after 6 seconds how high did it go and where was it 4 seconds after start (g = 9.8m/s2)??
Answer:
here, v = 0, a = - 9.8 m/sec^2, t = 3 sec
v = u + at
0 = u + (-9.8) * 3
0 = u - 29.4
u = 29.4 m/sec
here, u = 29.4m/s, t = 3sec, a= -9.8m/s^2
s = ut + 1/2 a t^2
s = 29.4 * 3 + 1/2 * - 9.8 * 3^2
s = 88.2 - 4.9 * 9
s = 88.2 - 44.1
s = 44.1 m
here, u = 0, a = 9.8m/s^2, t = 1 sec, s = ?
position after 4sec :
s = ut+ 1/2 at^2
s = 0 * 1 + 1/2 * 9.8 * 1^2
s = 4.9m
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What biotic factors do the organisms in Movile Cave rely on?
Answer:
All cave animals and organisms fit into three categories. Placement into these categories depends on how much time the organisms actually spend in the cave.
The first type is known as Trogloxenes. You can think of trogloxenes as cave visitors. They come and go at will, but use the cave for specific parts of their life cycle (hibernation, giving birth, etc.) Although it spends specific parts of its life in the cave, it will never spend a complete life cycle in the cave. Examples of animals that are All cave animals and organisms fit into three categories. Placement into these categories depends on how much time the organisms actually spend in the cave.
The first type is known as Trogloxenes. You can think of trogloxenes as cave visitors. They come and go at will, but use the cave for specific parts of their life cycle (hibernation, giving birth, etc.) Although it spends specific parts of its life in the cave, it will never spend a complete life cycle in the cave. Examples of animals that are trogloxenes are:
-Bats
-Bears
-Skunks
-Raccoon
-Moths (sometimes)
Troglophiles are the next level. These are organisms that survive outside the cave, but may prefer to live outside of it. They leave the cave only in search for food. A troglophiles can chose to live its entire life either inside or outside of a cave. Some examples of trogphiles are:
-Beetles
-Worms
-Frogs
-Salamanders
-Crickets
-Spiders
-Crayfish (sometimes)
Troglobites are animals that live in the cave but do not come out. They often have physical adaptions to the cave life like no vision, or loss pigment because light does not reach this part of the cave. Examples would be
-Snails that have thin white shells and small eyes
-Blind cave fish which has no eyes and no color
-Kauai Cave Wolf Spider which also has no eyes.
Bats are not true troglobites because they only use the cave for sleep, hiding and reproduction. There is about 50 000 troglobites in the world. are:
-Bats
-Bears
-Skunks
-Raccoon
-Moths (sometimes)
Troglophiles are the next level. These are organisms that survive outside the cave, but may prefer to live outside of it. They leave the cave only in the search for food. A troglophiles can chose to live its entire life either inside or outside of a cave. Some examples of trogphiles are:
-Beetles
-Worms
-Frogs
-Salamanders
-Crickets
-Spiders
-Crayfish (sometimes)
Troglobites are animals that live in the cave but do not come out. They often have physical adaptions to the cave life like no vision, or loss of pigment because light does not reach this part of the cave. Examples would be
-Snails that have thin white shells and small eyes
-Blind cavefish which has no eyes and no color
-Kauai Cave Wolf Spider which also has no eyes.
Bats are not true troglobites because they only use the cave for sleep, hiding, and reproduction. There are about 50 000 troglobites in the world.
dimension for weight
Answer:
What is meant by
Explanation:
Dimensions
Answer:
The dimension of weight is MLT−2: mass times acceleration, that is, a force.
Explanation:
hope this will help you
Pedro has collected different kinds of rocks. He begins testing the rocks' hardness to see how they compare.
What is the best phrase to describe what Pedro is doing?
A.
asking a question
B.
conducting a scientific investigation
C.
reporting scientific results
D.
forming a prediction
Answer:
B is the answer to the question
How did unarmed defense techniques develop? Why were they needed? Why not just use a knife or a sword?
Answer:
Buddhist monks traveled from india to china and because of their beliefs they weren't allowed to use weapons.
Explanation:Ez
Two iron bolts of equal Mass one at a hundred see another at 55 Sierra place in the insulated cylinder assuming the heat capacity of the container is negligible what is the final temperature inside the container
Answer:
[tex]T_2 = 77.5c[/tex]
Explanation:
From the question we are told that
Temp of first bolts[tex]T_1=100[/tex]
Temp of 2nd bolt [tex]T_2=55[/tex]
Generally the equation showing the relationship between heat & temperature is given by
[tex]q=cm \triangle T[/tex]
Generally heat released by the iron bolt = heat gained by the iron bolt
Generally solving mathematically
[tex]-(0.45*m* (T_2-100 \textdegree c)) = 0.45*m*(T_2 -55\textdegree c)[/tex]
[tex]-(T_2-100 \textdegree c)) = (T_2 -55 \textdegree c)[/tex]
[tex]T_2 +T_2= 100 \textdegree c+55 \textdegree c[/tex]
[tex]T_2=\frac{155 \textdegree c}{2}[/tex]
[tex]T_2 = 77.5 \textdegree c[/tex]
Therefore [tex]T_2 = 77.5 \textdegree c[/tex] is the final temperature inside the container
Un vagón de 250 kg situado en la cima de una montaña rusa inicia su descenso por una rampa inclinado 60º sobre la horizontal. Si no tenemos en cuenta el rozamiento: a. Dibuja todas las fuerzas que actúan sobre el vagón. b. Calcula la fuerza y la aceleración con que desciende.
What is the impulse on a 45,000 kg airplane when it changes its velocity
from 242 m/s to 258 m/s?*
Answer:
=720000kgm/s
Explanation:
The impuse is equivalent to the rate of change of momentum which is expressed below as
Impulse= mv2 - mv1
=m(V2 - V1)
V1= initial velocity= 242 m/s
V2=final velocity= 258 m/s?
m= mass of the plane =45,000 kg
Then if we input the values, we have,
= 45000(258-242)
=720000kgm/s
Hence,the impulse on a 45,000 kg airplane is 720000kgm/s
The brakes on a 15,680 N car exert a stopping force of 640 N.
The car's velocity changes from 20.0 m/s to 0 m/s. What is the
mass of the car? (Estimate 10 N/kg for g.)
Answer:
1568 Kg is the answer
Explanation:
A sloth moves 3 m to the right and then climbs 4 m up a tree.
How many degrees above the ground is the sloth compared to its initial position?
Answer:
The answer is 53.13
Explanation:
Cuz it is. It's not that hard
Answer:
A sloth moves 3 M to the right and then climbs 4 m up a tree.
How many degrees above the ground is the sloth compared to its initial position?
Answer: 53.1°
What is the mechanical advantage of the lever shown below?
Answer:1.35
Explanation:
The mechanical advantage of the lever shown in the question is 1.27. Mechanical advantage is the force amplified by a mechanical tool. Thus, the correct option is B.
What is Mechanical advantage?Mechanical advantage is the measure of the force amplification which is achieved by using a tool such as, a mechanical device or machine system. The mechanical device trades off input forces against the movement to obtain a desired amplification in the output force of the system.
Mechanical advantage of the lever is simply the ratio of the effort arm to the load arm. Effort arm is the distance from the pivot to the point of application of the force while the load arm is the distance of the lord from the pivot point.
Therefore, the effort arm is 0.27m while the load arm is 0.2 m. Mechanical advantage is calculated through the formula:
MA=effort arm/load arm
MA = 0.27/0.2
MA = 1.35 which is close to 1.27
Therefore, the correct option is B.
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Your question is incomplete, most probably the complete question is:
What is the mechanical advantage of the level shown below?
A. 0.79
B. 1.27
C. 2.6
D. 3.67
20 pts !!!!
Four identical pallets of bricks, each with a mass of 40 kg with a square cross-sectional area of 0.50 m2, are stacked on the floor. What is the change in height of the pallet at the bottom of the stack if the pallets are 5.0 m tall when not stacked?
a.
1.04 μm
b
0.78 μm
c
0.26 μm
d
0.16 μm
In this activity, you will research how scientists developed historical
models of the atom and present your findings. In the process, you
will draw evidence from texts to support analysis, reflection, and
research
Answer: Bohr's model (1913)
Niels Bohr improved Rutherford's model. Using mathematical ideas, he showed that electrons occupy shells or energy levels around the nucleus. The Dalton model has changed over time because of the discovery of subatomic particles.
Bohr's model (1913)
Niels Bohr improved Rutherford's model. Using mathematical ideas, he showed that electrons occupy shells or energy levels around the nucleus. The Dalton model has changed over time because of the discovery of subatomic particles
Dalton's atomic theory proposed that all matter was composed of atoms, indivisible and indestructible building blocks. While all atoms of an element were identical, different elements had atoms of differing size and mass.
John Dalton
The idea that everything is made of atoms was pioneered by John Dalton (1766-1844) in a book he published in 1808. He is sometimes called the "father" of atomic theory, but judging from this photo on the right "grandfather" might be a better term.
Explanation:
what is the relationship between frequency and wavelenghts of an EM wave?
A.as wavelengths decreases, the frequency of the waves increases.
B.as wavelengths decreases,the frequency also decreases
C.the wavelength and the frequency has a direct relationship
D.there is no relationship existing between wavelength and frequency
Answer:
a...as wavelengths decreases ,the frequency of the waves increases.Identify the physical property of a material that plays an important role in determining if the collision is elastic or not based on your air tracks simulation data.
Answer:
They are spherical and hollow (not compact or dense)
Explanation:
An elastic collision is a form of a collision where kinetic energy and momentum are conserved in the process. When there is zero loss of kinetic energy and momentum, it is called a perfectly elastic collision.
This form of collision is observed in atmospheric gases and colliding balls which happens to be spherical and hollow.
A star has ______________________________________________; it appears to be moving across the sky as a night progresses.
Answer:
Apparent Motion
Explanation:
Apparent Motion of a star is a scientific term that describes the phenomenon that is observed as a result of the earth's rotation which is based on the area or where the observer is situated, and then the point at which the star is found comparable to the rotation axis of the earth.
This often makes the start to appear like it's moving across the sky.
Hence, A star has APPARENT MOTION; it appears to be moving across the sky as the night progresses.
a 100kg car travels at 2m/s. what is the momentum in kg
Answer:
200 kg.m/sExplanation:
The momentum of an object can be found by using the formula
momentum = mass × velocity
From the question we have
momentum = 100 × 2
We have the final answer as
200 kg.m/sHope this helps you
why does a typhoon hit a location twice?
A car of mass 700 kg and movie at a speed of 30 m per 2nd collides with a stationary truck of mass 1400 kg and the 2 vehicles locked together on impact and the combined velocity of the car and the truck after the collision is what
Answer:
10m/s
Explanation:
(m1)(v1)+(m2)(v2)= (m1+m2)(v[final])
(700)(30)+(1400)(0)= (700)(v)+(1400)(v)
21000= 2100v
v=10m/s
Please help me with this question
Explanation:
I think the answer is 3/5
A helium-filled balloon in the room of a house suddenly bursts.
State and explain, in terms of atoms, what happens to the helium from the
balloon after the balloon has burst.
I was walking down the street and collapsed. My heart was racing and I struggled with
breathing. As I lay there, I watched as people walked by me not offering to help. At
one point I thought a young lady was looking towards me but when she noticed
everyone else's behavior, she turned and walked on past me. This scenario shows:
O the mere exposure effect.
O the fundamental attribution error,
O social loafing.
the foot-in-the-door phenomenon.
O the bystander effect.
Answer:
O the bystander effect.
Explanation:
In psychology, bystander effect is a theory that explains the unwillingness of a person to render help due to the presence of others. This theory explains that there is every tendency to help a victim in need when others are not there but act contrarily in the presence of others.
This is the case in this question where someone collapsed and laid helplessly on the floor due to difficulty in breathing. People walked past this victim without rendering assistance, however, a young lady who was about to help also walked past when she noticed that others were there and not offering help. This young lady has just portrayed the "BYSTANDER EFFECT".
Jose has two bar magnets. He pushes the ends of the two magnets together and then lets it go. The magnets move quickly apart. Which of the following statements best explains why this happens
A.The north poles of the two magnets are facing each other.
B.One magnet is a north pole & one magnet is a south pole.
C.The ends of the magnets repel each other but the centers attract. D.One magnet is storing energy & one magnet is releasing energy.
Answer:
A. like poles repel or push apart
A 747 requires a takeoff speed of 270 meters per second if it is to get off the
ground. Calculate the acceleration required for the 747 that begins from rest
to takeoff on a 1000 meter long runway.
Answer:
a = 36.45[m/s²]
Explanation:
We can calculate the acceleration value by means of the following expression of kinematics.
[tex]v_{f}^{2} =v_{o}^{2} +2*a*x[/tex]
where:
vf = final velocity = 270 [m/s]
Vo = initial velocity = 0 (begins from rest)
a = acceleration [m/s]²
x = distance required by the plane = 1000 [m]
[tex](270)^{2} =0+2*a*1000\\72900=2000*a\\a=36.45 [m/s^{2} ][/tex]
The point of a nail has an area of 0.25cm squared, and an average person has a weight of 700 N. Explain in detail why it is possible to lie on a bed of 4000 nails, but not on one single nail. Thanks
Answer:
It is possible to lie on a bed of 4000 nails, but not on one single nail because a bed of 4000 nails exerts lesser pressure than a bed of one single nail .
Explanation:
Given;
weight of an average person, W = F = 700 N
area of the nail, A = 0.25 cm² = 0.25 x 10⁻⁴ m²
The pressure exerted by a single nail is given as;
P = F / A
P = 700 / (0.25 x 10⁻⁴)
P = 2.8 x 10⁷ N/m²
The pressure exerted by 4000 nails is given as;
Total surface area of 4000 nails = 4000 x 0.25 x 10⁻⁴ m² = 0.1 m²
P = F / A
P = 700 / 0.1
P = 7,000 N / m²
From the calculated values, 4000 nails exerts less pressure on the person than one single nail because pressure decreases with increase in surface area of an object.
Thus, it is possible to lie on a bed of 4000 nails, but not on one single nail because a bed of 4000 nails exerts lesser pressure than a bed of one single nail .