Answer:
Correct answer: Third statement P = 4900 W
Explanation:
Given:
m = 500 kg the mass of the elevator
h = 10 m reached height after t = 10 seconds
P = ? power of the motor
The formula for the calculating power of the motor is:
P = W / t
since work is a measure of change in this case of potential energy then it is:
W = ΔEp = Ep - 0 = Ep
In this case we must take g = 9.81 m/s²
Ep = m g h = 500 · 9.81 · 10 = 49,050 W ≈ 49,000 W
Ep ≈ 49,000 W
P = Ep / t = 49,000 / 10 = 4,900 W
P =4,900 W
God is with you!!!
Drag each label to the correct category.
Decide whether each statement describes mass or weight.
measured in newtons
measured in kilograms
does not change when
gravity changes
changes when gravity
changes
the amount of matter
in something
a gravitational force
Mass
Weight
Answer:
See details below
Explanation:
1) The amount of matter in something - is a mass - does not change when gravity changes - it is measured in kilograms.
2) a gravitational force - is a force (normally called weight) - changes when gravity changes - it is measured in newtons.
-- measured in newtons . . . . . Weight
-- measured in kilograms . . . . . Mass
-- does not change when gravity changes . . . . . Mass
-- changes when gravity changes . . . . . Weight
-- the amount of matter in something . . . . . Mass
-- a gravitational force . . . . . Weight
Is this Conduction, Convection, or Radiation:
The top floor of a building is the warmest.
Answer:
convection
Explanation:
hot air rising is a common example of heat convection
Answer: Radiation
Explanation:
Radiation is like for example the sun gives out the radiation from it's heat and for the example you have the heat from the stove is warming the house up from it's radiation waves.
Answer questions 4 and 5.
Answer:
4. Momentum = mass x velocity
= 920kg x 25m/s = 23000kgms¯¹
5.Dolphin. Momentum of dolphin is 1000kgms¯¹ whereas the momentum of manatee is 700kgms¯¹
These can be found using the formula above.
A rocket for a space shuttle is producing a constant acceleration of 2.15 m/s2 . What is its velocity 94.0 seconds after the rocket begins to fire?
Answer: 202.1 m/s
Explanation:
Given that,
acceleration of rocket (A) = 2.15 m/s2 velocity (V) = ?
Time taken (T) = 94.0 seconds
Since acceleration is the rate of change of velocity per unit time
i.e Acc = velocity / time
Velocity = Acceleration x time
V = (2.15 m/s2 x 94.0 seconds)
V = 202.1 m/s
Thus, the velocity is 202.1 m/s
What is the change in the direction of a wave when it passes obliquely from one medium to another called?
A
refraction
B
interference
C
diffraction
D
superposition
Answer:
Refraction?
Explanation:
(60 POINTS!!) Which lunar phase follows a waxing gibbous phase
a. Full
b. New
c. First quarter
d. Third quarter
After the waxing gibbous, the lunar phase is the full moon so the answer is A.
Answer:
A
Explanation:
Full moon is the phase after a waxing gibbous
A 2.0 kg guinea pig runs at a speed of 1.0 m/s what is the guinea pigs kinetic energy
The kinetic energy for the above data is 1.0000 J.
The kinetic energy (KE) is calculated using the formula KE = 1/2 * m * v^2, resulting in a kinetic energy of 1.0 Joule for a 2.0 kg guinea pig moving at a speed of 1.0 m/s.
The kinetic energy (KE) of an object in motion is determined by the formula: KE = 1/2 * m * v^2, where m is the mass and v is the velocity. For the guinea pig in question, with a mass (m) of 2.0 kg and a velocity (v) of 1.0 m/s, the calculation is as follows:
KE = 1/2 * 2.0 kg * (1.0 m/s)^2
KE = 1/2 * 2.0 kg * 1.0 m^2/s^2
KE = 1.0 kg * 1.0 m^2/s^2
KE = 1.0 Joule
Therefore, the kinetic energy of the 2.0 kg guinea pig running at a speed of 1.0 m/s is 1.0 Joule.
This type of soil occur in temperate climates where rainfall is moderate to high.
Question 4 options:
pedocal
laterite
pedalfer
humus
Answer:
Pedalfer soils
Explanation:
6.18b: Pedalfer soils occur in temperate climates experiencing moderate to high rainfall.
The type of soil that occurs in temperate climates where rainfall is moderate to high is pedalfer soil.
What is a temperate climate?A temperate climate is a moderate climate that is characterized by relatively mild temperatures and distinct seasonal changes.
Here,
Pedalfer soils are also known as "brown earth" and are characterized by a high content of iron and aluminum oxides. They are formed in regions with a humid climate, where rainfall leaches away nutrients and minerals from the topsoil and causes the accumulation of iron and aluminum oxides in the subsoil. Pedalfer soils are generally fertile and are commonly used for agricultural purposes due to their ability to support plant growth.
In contrast, pedocal soils are found in arid or semi-arid regions, laterite soils are found in tropical regions with high rainfall, and humus is a type of organic matter that can be found in various soil types.
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How do electromagnetism and gravitation differ from the strong and weak nuclear forces?
is an apple hanging from a tree konetic energy or potential energy
Answer:
Potential
Explanation:
This is because it has not yet fallen, and it has the potential to fall and turn into kinetic energy. When it starts falling, it will be kinetic.
Answer:
Potential because it is in place.
Explanation:
Kinetic energy is when something is in motion. Potential is sitting still.
Hope this helps :)
Placed exactly between two oppositely charged point charges, a test charge (the
sensor) will show?
A) Zero force
B) Minimum force
C) Maximum force
D) Option 4
Placed exactly between two oppositely charged point charges, a test charge will show zero force. Thus, the correct option is A.
What is a Test charge?A test charge is a very small positive charge which is used to detect the presence of an electric field. Test charge should be as small as possible so that its presence does not affect the electric field due to source charge. The electric charge which produces the electric field is called a source charge.
The electric field strength (E) can be detected through the help of a test charge(q).
E = F/ q
where, E = electric field strength,
F = force applied,
q = charge
Therefore, the correct option is A.
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Explain using complete sentences where on the HR diagram you would expect to find a main sequence star based on its physical properties.
Answer:
The Hertzsprung-Russel Diagram also known as HR diagram is stars' scatter plot showing the relation of luminosity or absolute magnitude vs spectral class or surface temperature. The main sequence stars can be plotted on a HR Diagram as a diagonal band as their physical properties vary a lot.
The mass of these stars ranges from about a tenth of that of the Sun to about 200 times the mass of the Sun. Inside these stars Hydrogen fusion results in Helium. 90% of the stars, including the Sun, in the Universe lies in this category.
Their surface temperature lies in the range of 2500 Kelvin to 40000 Kelvin.
And Giant Stars:
A giant star is a star with a radius much larger than that of our Sun (even hundreds of times bigger). They can be either blue giants or red giants: in the first case, the surface temperature is very high, higher than that of the Sun, while in the second case the surface temperature can be lower than that of the Sun. The same applies to the mass: blue giants are very massive stars, burning quickly their nuclear fuel, while red giants can have small masses (a little bit bigger than that of our Sun).
We can find giant stars in the upper part of the HR diagram, blue giants will be on the upper left corner since they have high luminosity and high temperature, while red giants will be on the upper right corner, having high luminosity but low temperature.
Explanation:
Figure 3
(b) The surface is tilted to an angle of 37 degrees from the horizontal, as shown above in Figure 3 The blocks are each given a push so that at the instant show
Other
they are
go de
1. Each block has a mass of 0.20 kg Calculate the magnitude of the net force exerted on the two block system at the instant shown above
Answer:
3.92 N (straight down)
2.36 N (down, parallel to the plane)
Explanation:
The only force acting on the system is apparently that due to gravity. The mass of the system is the sum of the masses of the blocks, so is ...
0.20 kg + 0.20 kg = 0.40 kg
The force due to gravity is given by ...
F = ma = (0.40 kg)(9.8 m/s²) = 3.92 N . . . (straight down)
That force is acting straight down, so is at an angle with respect to the direction the blocks are constrained to move.
The force down the plane is (3.92 N)·sin(37°) ≈ 2.359 N . . . (down the plane)
_____
Comment on the answer
We have given two answers to the question, because in this frictionless system, the force acting normal to the plane of motion is irrelevant to the system dynamics. The question asked for the net force on the system, which is the force due to gravity, so we have given that magnitude also.
The parallel force on the block system is 2.36 N
The perpendicular force on the bock system is 3.13 N.
The given parameters;
mass of the first block, m₁ = 0.2 kgmass of the second block, m₂ = 0.2 kgangle of inclination, θ = 37⁰The magnitude of the net force exerted on the block system is calculated as follows;
The parallel force on the block system is calculated as;
[tex]F_{||} = mg \times sin(\theta)\\\\F_{||} = (0.2 + 0.2)\times 9.8 \times sin(37)\\\\F_{||} = 2.36 \ N[/tex]
The perpendicular force on the bock system;
F⊥ = mg x cos(Ф)
F⊥ = (0.2 + 0.2) x 9.8 x cos(37)
F⊥ = 3.13 N
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What is the maximum power consumption of a 3.0 V portable electronic device that draws (max) 270 mA of current?
Answer:
0.81 Watts
Explanation:
P = IV
P = (0.27 A) (3.0 V)
P = 0.81 W
PLZ HELP
Which statement is true for light passing into a medium that is more optically dense than the first medium through which it passed?
The index of refraction of the second medium is lower.
The index of refraction of the second medium is higher.
The index of reflection of the second medium is lower.
The index of reflection of the second medium is higher.
The statement 'the index of refraction of the second medium is higher' is TRUE for light passing into a second medium that is more optically dense than the first medium.
The refraction index of an object is a measurement that indicates how fast light can travel through this object.The refraction index of a given material/substance can be estimated as the velocity of light of a given wavelength divided by this velocity.The higher the refraction index of an object, the closer to the expected direction the light will travel.In conclusion, the statement 'the index of refraction of the second medium is higher' is TRUE for light passing into a second medium that is more optically dense than the first medium.
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Final answer:
The correct statement is that when light passes into a medium that is more optically dense than the first medium, the index of refraction of the second medium is higher.
Explanation:
When light passes into a medium that is more optically dense than the first medium, the index of refraction of the second medium is higher. This is because a higher index of refraction indicates a more optically dense medium. Consequently, the light ray bends towards the normal -- a line perpendicular to the interface of the two media -- when transitioning from a less optically dense medium to a more optically dense one.
True or False? When a pot of water is heated on a stove, it will begin to bubble. This is a sign that there was a chemical reaction.
True
false
Answer:
False
Explanation:
Boiling water is not a chemical change it is a Physical change
Hope this helps PLEASE MARK AS BRAINLIEST !!Answer:
false
Explanation:
Show that a body projected vertically up from the ground, the distance travelled by it in the last second of its upwards motion is an constant independent of its initial velocity
Answer and explanation:
Let [tex]v_1[/tex] be the velocity of a body projected vertically up, 1 second before it reaches its maximum height. We know, from the kinematics equations, that the distance traveled [tex]y[/tex] in an interval of time [tex]t[/tex] is equal to:
[tex]y=v_0t-\frac{1}{2}gt^{2}[/tex]
Then, in the last second, the distance traveled [tex]y_1[/tex] is equal to:
[tex]y_1=v_1t-\frac{1}{2}gt^{2}[/tex]
But the velocity [tex]v_1[/tex] is related to the time by the equation:
[tex]t=\frac{v_1}{g}\\\\v_1=gt[/tex]
And substituting this expression in the equation above, we obtain:
[tex]y_1=gt^{2}-\frac{1}{2}gt^{2}\\\\y_1=\frac{1}{2}gt^{2}\\\\y_1=\frac{1}{2}(9.8m/s^{2})(1s)^{2}\\ \\y_1=4.9m[/tex]
It means that the distance traveled by the body in the last second of its motion is a constant, independent of its initial velocity.
A moving object slows to a stop because of compression.*
True
False
Answer: false
Explanation: friction makes objects slow down and stop
Compare and contrast Earth to the other inner planets.
The inner planets are;- Mercury, Venus, Earth and Mars. Earth is the only planet which has atmosphere, water on the surface or know of to have water(Mars might have water underground), and life.
Mercury is pretty much a small planet on fire by day, but freezes at night.
Venus is a gas planet which is usually on fire in places too, but has mass ice craters on the surface.
Earth, well just look out your window.
Mars may have been an earth like planet at one stage, (still unknown) but is known as the red planet due to its volcanic activity. Mars also has the biggest mountain/volcano on any known planet called Mt Olympus. It's 3 times the size of Mt Everest.
Hope this helps!! :)
Which physical trait is most likely to be influenced at least partly by environment?
A) height
B) hair color
C) weight
D) eye color
Answer:
Height, Hair color and Eye color is mostly influenced by genes. Weight on other hand can be influence by gene a little but its mostly on environment such as diet control and other things.
Explanation:
1. Butterflies usually are identified by the colors and patterns on their wings. Butterflies have four wings. The two wings near the butterfly's head are "forewings while
ead are forewings while
the wings near the butterfly's tail are "hindwings. You can use the following dichotomous key to identify four common butterfly species in North America.
i
ii.
Hindwings pointed
Go to 2
Hindwings rounded ..................... Goto 3
Wings mainly yellow ............... Papilio glaucus
Wings mainly black .............. Papilio polyxenes
Wings orange with black piping...Danaus plexippus
Wings yellow with black edges..... Colias philodice
ii.
i.
i.
Based on the key, what speries of butterfly is shown below?
A Papilio glaucus
The butterfly in question is most likely a Papilio glaucus. This determination is made based on the features described in the provided dichotomous key, mainly the color of the wings. In a real situation, other factors such as geography could also play a role in identification.
Explanation:The question presents a dichotomous key that is used to identify species, in this case, butterfly species based on wing shape and pattern. This is a common biological identification method. The butterfly in question is identified as Papilio glaucus.
This determination is based on the key provided: if the butterfly's hindwings are pointed or rounded (no specific shape was mentioned in the question), then we check the primary color. The Papilio glaucus is primarily yellow, therefore, if the butterfly has primarily yellow wings it is most likely this species.
Please note, that real-world species identification can be more complex and involve factors such as geographical location, time of year, and more.
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15. Where is chemical energy contained in a compound?
Just search it up on google for the correct answer, not that hard.
Explanation:
Answer:
Chemical energy is stored in the bonds of a compound.
Explanation:
Chemical energy is a type of potential energy and is stored in chemical bonds.
a person who works in only area of a subject is a
A person who works in only one area of a subject is known as a specialist. This applies to many fields, including world languages, where a person who intensely studies and focuses only on one particular language and its aspects, such as Spanish, could be considered a Spanish language specialist.
Explanation:A person who works in only one area of a subject is often referred to as a specialist. This term can be applied across many fields, but is especially relevant in the field of world languages. For example, a person who intensely studies and focuses only on Spanish language and literature might be considered a Spanish language specialist.
These individuals typically have deep knowledge and understanding of their specialization. This not only includes the language itself, but also its literature, culture, history and other aspects that might not be covered by someone with broad but shallow knowledge. Therefore, if you're looking to learn advanced Spanish for example, seeking help from a Spanish language specialist would be highly beneficial.
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How many 75-W lightbulbs, connected to 120 V can be used without blowing a 15-A fuse?
Explanation:
P = IV
n (75 W) = (15 A) (120 V)
n = 24
There could be 24 , 75-W lightbulbs connected to 120 V that can be used without blowing a 15-A fuse.
What is power?The rate of doing work is known as power. The Si unit of power is the watt.
Power consumed by the bulb =work done /time
The mathematical expression for the electric power is as follows,
P = VI
As given in the problems we have to find out how many 75-W lightbulbs, connected to 120 V can be used without blowing a 15-A fuse,
The total power that would blow the fuse = 120 × 15
=1800 watts
Given that a single lightbulb consumes 75 watts,
The number of bulbs = 1800 watts / 75 watts
= 24 lightbulbs
Thus, there would be 24 lightbulbs.
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What can occur in a physical change?
Which type of mirror causes beams of light to spread apart
A) flat mirror
B) concave mirror
C) diverging mirror
D) converging mirror
Answer:
c . diverging mirror
Explanation:
also known as convex mirror which causes the incident rays of light to spread after reflaction.
What is the melting point of substance A?
Heating Curve of Substance A
600
500
400
E
Temperature (Cº)
300
200
100
Heat Added (J)
Answer:
Solids are easily recognized by their ability to retain a fixed shape and definite volume. Particles making
up a solid are held together in a rigid form. They are not free to move about or slide past one another and
the solid does not have the ability to flow. (Although the particles of a solid do not move position to position, they do have motion in that they are constantly vibrating.
To change the temperature of a solid, heat energy must be added. The amount of heat energy that changes
the temperature of 1.0 g of a solid by 1.0°C is called its specific heat (c). Each substance has its own
specific heat. The specific heat of ice is 2.1 Joules/g°C. In other words we must supply 1.0 gram of ice
with 2.1 Joules of heat energy to raise its temperature by 1.0 °C.
The general equation for calculating heat energy to change the temperature of a solid is:
Heat = Mass x Specific Heat (solid) x Temperature Change
Q = m c DT
10 g 10 g 10 g 10 g 10 g 10 g
Calculate the heat necessary to change 10 g of ice(s) at -20 °C to 10 g of ice(s) at 0°C. (A-B)
Q = mc∆T = (10 g) (2.1 J/g°C) (20°C) = 420 J
If you continue to add heat energy once the temperature of the ice reaches 0°C , the heat absorbed is called
the heat of fusion (Lf). This heat is used to cause a change of phase (from a solid to a liquid). This heat is
increasing the potential energy of the molecules of the solid. No temperature change takes place. Each
substance has its own heat of fusion. The heat of fusion for ice is 340 Joules/g. Exactly the same amount
of heat is given up when 1.0 g of water is changed to ice. This heat is called the heat of crystallization.
The general equation for calculating heat energy to change a solid to a liquid is:
Heat = Mass x Heat of Fusion
Q = m Lf
Calculate the heat necessary to change 10 g of ice(s) at 0°C to 10 g of water(l) at 0°C.(B-C)
Explanation:
Q = mLf = (10 g)( 340 J/g) = 3400 J
Answer:
Correct Answer: 200° C
Explanation:
Have a great day!
What force is required to move an object 8 m using 24 j of work?
Answer:
3N
Explanation:
Workdone = F x d
F = force
d = distance 8m
Workdone = 24J
24 = F x 8
Divide both sides by 8
24/8 = F x 8/8
3 = F
F = 3N
A man walks 3.50 mi due east, then turns and walks 2.57 mi due north. How far
and in what direction is he from the starting point
Answer:
4.34 mi at [tex]36.3^{\circ}[/tex] north of east
Explanation:
The displacement of an object in motion is a vector connecting its initial position to the final position of motion.
In this problem, the man has 2 different motions:
- 3.50 mi due east
- 2.57 mi due north
We can take the east direction as positive x-direction and north as positive y-direction, so these two motions can be written as:
[tex]x=+3.50 mi[/tex]
[tex]y=+2.57 mi[/tex]
Since the two motions are perpendicular to each other, the resultant displacement can be found by using Pythagorean's theorem; therefore:
[tex]d=\sqrt{x^2+y^2}=\sqrt{3.50^2+2.57^2}=4.34 mi[/tex]
We can also find the direction using the equation:
[tex]tan \theta = \frac{y}{x}[/tex]
And therefore,
[tex]\theta=tan^{-1}(\frac{y}{x})=tan^{-1}(\frac{2.57}{3.50})=36.3^{\circ}[/tex]
compass needle normally points toward Earth's magnetic pole, which is near the North Pole. Which best explains why the
eedle moves away from the pole when it comes close to a current-carrying wire?
Current within the wire weakens the magnetic force of the pole.
Magnetism surrounding the wire weakens the magnetic force of the nole
Answer:
compass needle normally points toward Earth's magnetic pole, which is near the North Pole. Which best explains why the
eedle moves away from the pole when it comes close to a current-carrying wire?
Current within the wire weakens the magnetic force of the pole.
Magnetism surrounding the wire weakens the magnetic force of the nole
Explanation:
Answer:
(D)
Explanation:
A compass needle normally points toward Earth’s magnetic pole, which is near the North Pole. Which best explains why the needle moves away from the pole when it comes close to a current-carrying wire?
Current within the wire weakens the magnetic force of the pole.
Magnetism surrounding the wire weakens the magnetic force of the pole.
Current within the wire draws the needle toward the wire.
Magnetism surrounding the wire draws the needle toward the wire.