Answer:
MA of a machine is always less than VR.
Explanation:
It is because mechanical advantage decreases due to the friction and weight of moving parts of the machine whereas the velocity ratio remains constant.
which is an example of how the body maintains homostasis
Answer:
lemme see
Explanation:
Answer:
Reacting to heat/cold
Explanation:
When it is hot, you will sweat.
When it is cold, you will get warm.
c: hope i help u
common topics of physics include
Answer:
motion and forces
heat
waves
gravity
math
electricity and magnetism
conversation of energy and momentum
changes in motion come from;
A) unbalanced forces
B) balanced forces
C) mass
D) inertia
Answer:
C-Mass
Explanation:
Rosa eats a peanut butter and jelly sandwich for lunch. Peanut butter contains a lot of protein, and bread is mostly starch. Rosa plans to go for a run later this afternoon. Rosa is breathing normally
Answer:
She should consume carbohydrates rich foods before going to jogging.
Explanation:
Rosa should consume carbohydrates before she goes on jogging. Consuming high amount of protein rich foods is not suitable before jogging. One can consume protein rich foods when she is on weight loss program. Rosa should consume less peanut butter and jelly sandwiches and should focus on consuming bread and similar rich carbohydrates foods.
Juan's weight is twice the weight of his little sister Anna. They climb the same set of stairs and find they have the same power. Explain how this can be possible?
Answer:
We can define power as:
P = W/t
where W is work, and t is time.
And the work needed to climb a distance (we can assume that climb a set of stairs is equivalent to climbing a given height) is:
W = g*h*m
Where:
g = gravitational acceleration
h = height climbed
m = mass.
g and h are the same for Juan and his sister, and the only thing that changes is the mass
The work for Juan is:
Wj = g*h*M
And for his sister, that has half his
Wa = g*h*M/2.
Then the power for Juan, is:
Pj = Wj/t1 = (g*h*M)/t1
Where t1 is the time that Juan needs to climb the stairs.
And for Anna is:
Pa = Wa/t2 = (g*h*M/2)/t2
Where t2 is the time that Anna needs to climb the stairs:
We know that they have the same power, then:
Pj = Pa
(g*h*M)/t1 = (g*h*M/2)/t2
M/t1 = M/2*t2
t1 = 2*t2
This means that the time in which Juan climbs the stairs is twice the time that Anna needs to climb the stairs.
What sensory capacities does an infant have?
Which is the source of variations in a population of organisms? * changes in environment changes in genes the interaction of individuals with an environment the interaction of genes with an environment
Answer:
changes in genes
Explanation:
The correct answer would be changes in genes.
Variation refers to differences among living organisms of the same species. Variation in a population can be from 3 sources:
mutationrecombinationgenetic driftsA mutation refers to a sudden change in the DNA sequence of a gene. When a gene changes, new alleles are introduced into the gene pool and this creates variation within the population.
Recombination of genes arises from random mating/fertilization during sexual reproduction. Gamete formation results in gene recombination.
Genetic drifts refer to the changes to the alleles of the gene pool as a result of chance events. These changes further introduce variation into the population.
Hence, the correct answer among the options is changes in genes, also known as mutation.
If the density of water is 1 gram/cm3, this means that the mass of 100 cm3
of water should be *
Answer:
m = 100[gram]
Explanation:
In order to solve this problem, we must remember the definition of the density of matter, which is the relationship between mass and volume. The density can be calculated by means of the following formula.
[tex]Ro=m/V[/tex]
where:
Ro = density = 1 [gramm/cm³]
m = mass [gramm]
V = volume = 100 [cm³]
Now replacing:
[tex]m=Ro*V\\m=(1\frac{grm}{cm^{3} } )*100cm^{3} \\m=100[gram][/tex]
will give brainlist!
Why does it feel cooler at 90°F when the relative humidity is 30% compared to the same temperature and the relative humidity is 80%?
a. Because the drier air evaporates moisture off your skin more easily.
b. There is no real difference because the temperature is the same.
c. Because there is less air movement at 80% humidity.
d. Because the lower humidity brings down the temperature.
Explain the difference between dominant and recessive genes, and provide an example of each one.
Answer:
Dominant genes are genes that are most likely to be adapted to offspring. Recessive genes are genes that are least likely to be adapted to offspring. For example, if the father had brown eyes and the mother had green eyes, their offspring will most likely have brown eyes because brown eyes are considered dominant and more likely to happen.
Explanation:
not my answer i dont take credit
Which is a result of using a machine?
Answer:
Yes labor is required therefor jobs like cashier, and other low skill labor jobs I'll not be required
Explanation:
Lystrosaurus was a slow-moving, plant-eating reptile that lived over 250 million years ago. Fossils of Lystrosaurus have been found in the brown areas shown below. How is this explained by the existence of Pangaea?
Answer:
The Lystrosaurus was a herbivorous dinosaur, whose remains were found in Antarctica, the southern region of the African continent and the Indian peninsula.
This distribution of the fossils of this animal is a confirmation of the theory of continental drift, which supports the existence of a supercontinent, Pangea, about 300 million years ago. That is, it implies that this animal lived moving between the territories of India, Africa and Antarctica, which are today separated by thousands of kilometers of oceans. Therefore, given that at the time that the Lystrosaurus lived these territories were united, it was possible.
John accidentally drops his keys off the balcony at his apartment. John's friend Tony just happens to walk by at that moment and picks up the keys to throw them back up to John. If John is 5.33 meters above the sidewalk where Tony is, and Tony throws at 18 m/s at a 40 degree angle above the horizontal, will the keys make it back to John?
Answer:
the keys will make it back to John.
Explanation:
In order to find out if the keys will reach John or not, we can use the formula of projectile motion to find the maximum height reached by the keys:
H = V²Sin²θ/2g
where,
V = Launch Speed = 18 m/s
θ = Launch Angle = 40°
g = 9.8 m/s²
Therefore,
H = (18 m/s)²[Sin 40°]²/(2)(9.8 m/s²)
H = 6.83 m
Hence, the maximum height that can be reached by the projectile or the keys is greater than the height of John's Balcony(5.33 m).
Therefore, the keys will make it back to John.
Yes, Key will surely reach back to John.
Given that;
Velocity v = 18 m/s
θ Angle = 40°
g = 9.8 m/s²
Computation:
By using maximum height formula
H = [v²][sin²θ]/2g
H = (18)²[Sin 40°]²/[(2)(9.8)]
H = 6.83 m
6.83 meter is more then 5.33 meter,
So,
Key will surely reach back to John.
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The local high school is installing new bleachers at the stadium and must also add handrails to meet code. The students know the bleachers are 8 m tall, and they measure the depth of the bleachers at 7 m. How long must the handrails be to go along the bleachers from bottom to top? Use a component table to solve.
Answer:
The handrails must be approximately 10.63 meters long
Explanation:
The given parameters are;
The height of the bleachers, h = 8 m
The depth of the bleachers, d = 7 m
The length of the hand rails to go along the bleachers from bottom to top is given by Pythagoras' Theorem as follows;
The length of the hand rail = √(d² + h²)
∴ The length of the hand rail = √(7² + 8²) = √113 ≈ 10.63
In order for the handrails to go along the bleachers from top to bottom, they must be approximately 10.63 meters long.
When an object moves in a gravitational field, its potential energy converts into what? A. elastic potential energy B. chemical potential energy C. kinetic energy D. electrical potential energy
Answer:
B. chemical potential energy
Explanation:
If an object, such as a ball is lifted above the ground it has gravitational potential energy.
Answer:
B. chemical potential energy
Explanation:
thx
list and describe the 4 outside forces mentioned in the unit that can influence how we feel about our bodies
Answer:
force
Explanation:
i need the answer lol
Which describes a SEA BREEZE?
Answer:
A sea breeze describes a wind that blows from the ocean inland towards land. ... However, water heats up much more slowly than land and so the air above the land will be warmer compared to the air over the ocean. The warm air over the land will rise throughout the day, causing low pressure at the surface.
Explanation:
This should be right!
What would cause soil horizons to become mixed?
Answer:
The process of soil formation generally involves the downward movement of clay, water, and dissolved ions, and a common result of that is the development of chemically and texturally different layers known as soil horizons. The typically developed soil horizons, as illustrated in Figure 5.16, are: O — the layer of organic matter A — the layer of partially decayed organic matter mixed with mineral material E— the eluviated (leached) layer from which some of the clay and iron
Explanation:
i'm built different
What causes a partial lunar eclipse?
1. A partial eclipse causes the Moon to turn reddish from the refraction of the Sun's rays through the Earth atmosphere.
2. Only the penumbra of the Earth passes across the Moon, creating a circular shadow.
3. The Earth's umbra fits inside the Moon, creating an illuminated ring known as an annular eclipse.
4. The Earth's umbra only covers a part of the Moon causing a circular shadow to pass across it.
Answer:
4. The Earth's umbra only covers a part of the Moon causing a circular shadow to pass across it.
Explanation:
i took the quiz
When a liquid freezes into a solid, the particles of the substance. A. Lose energy B. Gain energy C. Move faster D. Disappear
Answer:
A
Explanation:
1. Which will speed up the rate of a chemical
reaction?
A Lower the temperature
B. Use less substance
C. Increase the surface area
D. Increase the amount of time
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A 200 kg bumper car is moving down the field at a velocity
of 10 m/s when it strikes an identical bumper car that is at
rest. The first car stops after the collision. What is the
velocity of the second car after the collision?
Answer:
It is 10 m/s
Explanation:
Carbon-14 has a half life of 5730 years. Consider a sample of fossilized wood that when alive would have contained 24g of C-14 it now contains 1.5g. How old is the sample
Answer:
5732 years
Explanation:
hope it helps, if not im sorry
The sample of fossilized wood is 22920 years old.
The half life is the time required for a substance to decay to half of its initial value. It is given by:
[tex]N=N_o(\frac{1}{2} )^\frac{t}{t_\frac{1}{2} }[/tex]
Where N is the final value of the substance, No is the initial value of the substance, t is the time and [tex]t_\frac{1}{2}[/tex] is the half life.
Given a half live of 5730 years, N = 1.5g, No = 24g. Hence:
[tex]1.5=24(0.5)^\frac{t}{5730} \\\\1/16=(0.5)^\frac{t}{5730} \\\\ln(1/16)=\frac{t}{5730} ln(0.5)\\\\t=22920\ years[/tex]
Therefore the sample is 22920 years old.
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Charlie runs at an average speed of 6.5 km/hr. If he runs for 1.5 hours, how far has he traveled?
Answer:
9.75 km
Explanation:
Charlie runs 6.5 km/hr
-> Charlie wants to run for 1.5 hours
6.5km + 6.5km/2
= 6.5 km + 3.25km
= 9.75 km
Can force be two-dimensional?
Answer:
Yes
Explanation:
Just as motion in two dimensions introduced vectors, forces in two dimensions also involve more involved issues.
At what location in this diagram do the magnetic field lines show that the magnetic field is strongest ?
The location in this diagram do the magnetic field lines show that the magnetic field is strongest is in C and wekeness in D.
What are magnetic field lines?The lines representing the magnetic field are closed, that is, they have no beginning or end. This can be observed when we place iron filings on a sheet of paper, over a bar magnet: the pattern of lines formed continues on the part of the paper that is on the magnet, closing.
In the region of the poles we see that the lines of magnetic induction are closer to each other, therefore, we consider that close to the poles the magnetic field is more intense. In this case it is stronger in C and weaker in D.
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#SPJ2
Answer:
The strongest is C
Explanation:
Just took the test and got it right, I don't need to over-explain it
A liter of gas has a pressure of 200 kPa. If the gas is put
into 2-L container, what will be its pressure, assuming its
temperature does not change?
Answer:
100kPa
Explanation:
Given parameters:
Initial volume of gas = 1L
Pressure = 200kPa
Final volume = 2L
Unknown:
Final pressure =
Solution:
According to Boyles's law "the volume of fixed mass of gas of a gas varies inversely as the pressure changes if temperature is constant".
Mathematically;
P₁V₁ = P₂V₂
P and V are volume and pressure
1 and 2 are initial and final states
Insert the parameters and solve;
200 x 1 = P₂ x 2
P₂ = 100kPa
Which of these changes will increase the energy loss of a building?
A. A decrease in the temperature of the outside of the building.
B. An increase in the R-value for the insulation materials used in the building
C. A decrease in the energy flux (W/m^2) of the building.
D. An increase in temperature difference between the inside and outside of the building.
1. The velocity decreases, and the kinetic energy decreases.
2. An increase in temperature difference between the inside and outside of the building.
3. The total kinetic energy remains the same.
4. 76,761 J
5. The energy loss must increase.
Temperature difference between the inside and outside of the building will increase the thermal flow. Option D is correct.
R- Value:
It is the measure of the efficiency of the material to resist the heat flow. Higher the R-value, better will be insulation. It is between 1.5-7.
As heat tend to move from higher temperature to lower temperature, when difference of temperature greater.
Therefore, temperature difference between the inside and outside of the building will increase the thermal flow.
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How should the student change the circuit to give negative values for current and potential difference?
Answer:
Please find the answer in the explanation.
Explanation:
How should the student change the circuit to give negative values for current and potential difference?
Positive and Negative current can be seen when charging and discharging a device or when powering a load.
Negative current can also be achieved when current is allowed to flow in other direction.
If the direction of the current is changed, the voltage will read negative. Changing of power or battery terminals can make voltmetre to read negative.
The student can reverse the direction of current flow in a circuit to obtain the negative values for current and potential difference in the circuit.
To determine the negative current flow and potential difference in a circuit, we can consider following ways;
During charging, the current flows in a specific direction for which it is taken as positive. Then the voltmeter reading will be positive and potential difference is positive.During discharging, the direction of current is reversed for which current becomes negative and the voltmeter reading is also negative. Hence, the potential difference is negative.Changing battery terminals also reverses the direction, to produce negative current and potential difference.Thus, the negative values of current and potential difference is obtained by reversing the direction of current flow in a circuit.
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You observe a meteor from two different locations A & B that are 8000 miles apart (opposite sides of the earth). The difference in viewing angles is 6 degrees. How far away is the meteor?
Answer:
r = 424.4 miles
Explanation:
If we consider the distance between the two locations A and B as the arc of a circle with the central angle given the difference between the viewing angles. Then, the distance between meteor and the locations, will be given as the radius of this arc. So, we will use the following formula to find this distance:
s = rθ
r = s/θ
where,
r = distance between observer and meteor = ?
s = distance between location A and location B = 8000 miles
θ = difference in viewing angles = (6°)(π rad/1°) = 6π rad
Therefore,
r = 8000 miles/6π rad
r = 424.4 miles