Answer:
monotremes such as the platypus often display early mammalian features that are similar to reptilian physiology and thus reflect all mammals' common evolutionary origin in reptiles. These features include the platypus's lower body temperature and lack of teats.
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Please help! This is due tomorrow!
A cyclist maintains a constant velocity of 6.4 m/s headed away from point A. At some initial time, the cyclist is 249 m from point A.
Part A: What will be his displacement from his starting position after 79 s?
Part B: What will be his position from point A after that time?
Match the word with the correct definition. 1. racket A. as someone says or something shows 2. in fact B. completely different in direction or position 3. perpendicular C. a piece of sports equipment used to hit a ball 4. opposing D. not able to stretch or bend easily 5. inelastic E. forming a 90-degree angle 6. according to F. used to emphasize what is true
The words with their correct definition include the following below:
1. racket - C. a piece of sports equipment used to hit a ball.
2. in fact - F. used to emphasize what is true.
3. perpendicular - E. forming a 90-degree angle.
4. opposing - B. completely different in direction or position.
5. inelastic - D. not able to stretch or bend easily.
6. according to - A. as someone says or something shows.
What is Inelastic?This is a word which is is referred to as a variable not being sensitive to changes or other parameters and is also used to describe a substance which can't stretch or bend easily.
In other to emphasize something which is true or valid , in fact is used which is the correct choice.
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Look at the picture of an electromagnet that has picked up one sewing pin.
Which change could you make to allow the electromagnet to pick up more
sewing pins?
A. Use a nail that is much larger than the one shown.
B. Use a nail made of a nonmagnetic material.
C. Use half as many coils of wire around the nail.
OD. Use twice as many coils of wire around the nail.
The size of the nail if increased, there will be more surface to attract more number of sewing pins. Thus by using a nail larger than the one shown, the number of pins picked up by the nail is increased.
What is an electromagnet?An electromagnet is a magnetic material or metal that produce an electromagnetic field on to which the magnetically susceptible particles can be attracted.
An electromagnetic field is a combination of electric field and magnetic field. The direction of both will be perpendicular for an object. A magnet is usually made of iron and iron containing alloys.
If the surface of the magnetic nail has more space to attract, then more pins can be picked up using this. We cannot increase the attracted pins by increasing the coils around the nails. Thus option A is correct.
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If it takes Ashley 4.5 seconds to run at an average speed of 5.5 meters per second, what is the distance (in meters) she covers in that time? Round your answer to one decimal place.
Given:
The average speed of Ashley is,
[tex]v=5.5\text{ m/s}[/tex]The time for which Ashley runs is,
[tex]t=4.5\text{ s}[/tex]The distance Ashley covers in this time are,
[tex]\begin{gathered} d=vt \\ =5.5\times4.5 \\ =24.7\text{ m} \end{gathered}[/tex]Hence, the distance is 24.7 m.
How do you find the energy transferred to water ? I had the temperature of water, highest water temp,increase in water temp, mass of metal block(iron), and decrease in metal block
Apply : ( for each element)
Q = m x c x ΔT
Where:
Q= heat
m= mass
c = specific heat capacity
ΔT = temperature change
CER (claim, evidence, reasoning)
Claim: Human powered generators are the best energy source for the rescure team.
Evidence: Human powered generators can be used to transfer enrgy any time somone is there to turn the crank.
Reasoning: ?
The reasoning that can be used to agree with the claim that has ben made is that the human powered generators are the best due to the fact that they would not have to require the long time and they would not have to consume resources.
What is a claim?This is the term that is used to refer to a statement or an assertion that has been made which has not yet been proven.
The human powered generators are the best due to the fact that they would not require the resources that are known to be more consuming. That is they are renewable and like fossils they would not have any forms of adverse effects on the environment that they are used.
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Imagine you are a teacher and you are introducing your 10th-graders to an important national test. As you open a bag of chips and check your phone for text messages, you explain that staying focused and double-checking answers is key, as that test may determine their post-graduation options. If your students do not pay attention to the material, it is probably because:
If your students do not pay attention to the material it is probably because you are delivering a mixed message.
National Examination means a test used by the Board to determine a candidate's ability for licensure administered by the NAB or other Board-approved examination. These provide a basis for examining candidates for selection to higher education levels such as B. For upper secondary or higher education and employment.
Federal law prohibits companies from producing these documents without a court order or subpoena. SMS recordings must be obtained from the party's wireless service provider. An attorney can obtain a court order or subpoena to obtain records directly from her provider of services. On your computer, open Messages for Web in a browser such as Chrome or Safari. After signing in go to settings and turn on Remember this device.
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If you are dividing an objects distance traveled by its speed, you are calculating its
Time of travel
Displacement
Momentum
Acceleration
If you are dividing an objects distance traveled by its speed, you are calculating its Time of travel.
What is Time of travel?
Time travel is the idea of moving between certain moments in time, similar to moving between various points in space by a person or an object, usually with the use of a fictitious machine called a time machine. The idea of time travel is well known in philosophy and literature, especially science fiction. H. G. Wells' 1895 book The Time Machine popularised the concept of a time machine. It is unknown whether going back in time is physically possible, and if it is, there may be causality issues that arise. It has been widely seen and is generally understood within the context of special relativity and general relativity to be possible to move through time in the opposite direction from how we typically perceive it.
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The laws of physics depend on your speed?True or False
False.
The laws of physics do not depend on your speed what can change is how we need to describe them, that is, if, for example, the frame from which we are describing the laws is accelerating then it is usually harder to explain the motion or phenomena happening but the laws of physics are not changing. Another example of this is when the speed is close to the speed light, on these situations we need to use relativistic equations to describe what is happening, the reason we don't do this when the speed is not comparable to the speed of light is because the relativistic effects are negligible but that does not mean that they are not there or that the laws are changing.
A ball is falling at terminal velocity. Terminal velocity occurs when the ball is in equilibrium and the forces are balanced.
Which free body diagram shows the ball falling at terminal velocity?
Answer:
Terminal velocity occurs when the frictional force of air counteracts the gravitational force of gravity.
In Second image, Both forces are equal and therefore is the correct answer
Consider the following question:
How does changing the drop height affect the speed of a ball rolling down a hill?
What is the dependent variable?
A Drop height
B Speed of the ball
C Size of the hill
D Mass of the ball
If we changed our speed limit signs to metric, what would probably replace the following? (Enter your answers to the nearest km/h.)(a) 30 mi/h___ km/h(b) 75 mi/h_____ km/
Given:
We have changed our speed limit signs to metric.
To find:
(a) 30 mi/h in km/h
(b) 75 mi/h in km/h
Explanation:
We know,
[tex]1\text{ mi=1.61 km}[/tex](a)
So,
[tex]\begin{gathered} 30\text{ mi/h} \\ =30\times1.61\text{ km/h} \\ =48.3\text{ km/h} \end{gathered}[/tex]Hence,
[tex]30\text{ m/h=48.3 km/h}[/tex]b)
Now,
[tex]\begin{gathered} 75\text{ mi/h} \\ =75\times1.61\text{ km/h} \\ =120.75\text{ km/h} \end{gathered}[/tex]Hence,
[tex]75\text{ mi/h=120.75 km/h}[/tex]There are 118 recognized pure substances that cannot be broken down into more simpler substances these are 118 substances are called
The substances that can't be broken into simpler substances are called "elements", and their properties are found in the periodic table of elements. Therefore, H is the right answer.
What is the speed of a sound wave in water if a dolphin emits a sound of 2856.89 Hz which has a wavelength of 0.539 m?
The speed of the sound wave in water would be 1529.86 meters / second if a dolphin emits a sound of 2856.89 Hz which has a wavelength of 0.539 m.
What is the frequency?It can be defined as the number of cycles completed per second. It is represented in hertz and inversely proportional to the wavelength.
Speed of the sound = frequency × wavelength
=2856.89 × 0.539
= 1529.86 meters / second
Thus, If a dolphin emits a sound with a wavelength of 0.539 meters and a frequency of 2856.89 Hz, the speed of the sound wave in water would be 1529.86 meters per second.
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A uranium-238 atom can break up into a thorium-234 atom and a particle called an alpha particle, α-4. The numbers indicate the inertias of the atoms and the alpha particle in atomic mass units (1 amu = 1.66×10−27 kg). When an uranium atom initially at rest breaks up, the thorium atom is observed to recoil with an x component of velocity of -2.40×105 m/s. How much of the uranium atom's internal energy is released in the breakup?
The internal energy released during the breakup is 5.26MeV.
The atomic number of uranium is 92. This means that the atomic structure has 92 protons and 92 electrons. The core of U-238 has 146 neutrons, but the number of neutrons varies between 141 and 146. Uranium is radioactive, so it constantly emits particles and transforms into other elements. A radioactive silvery metal.
Uranium is a very important element as it provides the nuclear fuel used to generate electricity in nuclear power plants. It is also the main material from which other synthetic transuranium elements are made. Neither you nor your customers are at risk of radiation emitted from the uranium in the Vaseline bottle whether it is held in hand or standing on a shelf or table. Accidentally ingesting or inhaling shavings does not put you or your customers at risk of uranium.
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How much heat is necessary to change 460 g of ice at -18°C to water at 20°C? kcal
Given:
The mass of ice is,
[tex]m=460\text{ kg}[/tex]The initial temperature of ice is,
[tex]t_i=-18^{\circ}C[/tex]The heat for this ice to become 0 degree C ice is,
[tex]\begin{gathered} H_1=460\times0.5\times18 \\ =4.14\text{ kcal} \end{gathered}[/tex]The heat needed for 0 degree ice to 0 degree water is,
[tex]\begin{gathered} H_2=460\times80 \\ =36.8\text{ kcal} \end{gathered}[/tex]Now the heat for the final step to reach 20 degrees is,
[tex]\begin{gathered} H_3=460\times1\times(20-0) \\ =9.2\text{ kcal} \end{gathered}[/tex]The total heat is,
[tex]\begin{gathered} H=4.14+36.8+9.2 \\ =50.1\text{ kcal} \end{gathered}[/tex]Hence the total heat is 50.1 kcal.
A motorist driving a 1172-kg car on level ground accelerates from 20.0 m/s to 30.0 m/s in a time of 5.00 s. Ignoring friction and air resistance, determine the average mechanical power in watts the engine must supply during this time interval.
The average mechanical power in watts that the engine must supply during this time interval is 58600 watts.
CALCULATION:-
The work done on an object by means of a net pressure equals the change in kinetic energy of the object:
W = KEf - KEi
W = 1/2m(vf² - vi²)
=1/2*1172*[30²-20²]
=293000 JOULE
Power is the rate at which work is performed. it's miles the paintings/time ratio. Mathematically, it's far computed the use of the following equation.
Power = Work/time
P = W / t
=293000/5
=58600 joule
Whilst pressure acts upon an object to cause a displacement of the object, it's miles said that work became accomplished upon the item. The kinetic energy of an object is the strength that it possesses due to its movement.
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Calculate the net force.
A line passes through (1,-5) and (-3,7). What is the slope of the line?
Given:
The coordinate of the points are,
[tex]\begin{gathered} (x_1,y_1)=(1,-5)_{} \\ (x_2,y_2)=(-3,7) \end{gathered}[/tex]The slope is,
[tex]\begin{gathered} m=\frac{y_2-y_1}{x_2-x_1} \\ =\frac{7-(-5)}{-3-1} \\ =\frac{12}{-4} \\ =-3 \end{gathered}[/tex]Hence, the slope is -3.
Many people have different ideas about what causes us to see different parts of the Moon. Which idea below best matches your thinking and explain your thinking
A. Earth casts a shadow on the Moon that allows us to see only the lit part of the Moon.
B.The Moon moves into the Sun's shadow, blocking out part of the Moon's light.
C.The part of the Moon we see depends on where the Moon is in relation to Earth and the Sun.
D.The Sun's movement around Earth causes different parts of the Moon to be reflected.
E.The Moon's rotation causes different parts of the Moon to be reflected back to Earth.
F.None of these. I think there is something else that causes us to see different moon phases.
The part of the Moon we see depends on where the Moon is in relation to Earth and the Sun.
What is the phases of moon ?Earth revolves around the Sun, while the moon revolves around the Earth. However, there are four primary moon phases; we also refer to them as the lunar phases. First Quarter, Full Moon, Last Quarter, and last but not least, The New Moon, are the four phases.
Any of the numerous Moon shapes created by the Sun's illumination of the lunar disc, as seen from Earth. There are eight phases that the Moon goes through: new, waxing crescent, first quarter, waxing gibbous, full, waning gibbous, last quarter, and waning crescent.Learn more about Phases of moon here:
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For the following, determine the meaning of the bolded word by using
definition and example clues from the text.
The snake wound itself around its prey, entwining the
mouse within its body.
A. The state of being wrapped around something
OB. A force of nature
C. An injury to the body
D. The action of hurting someone
A man is changing a light bulb at the top of a 1500 foot tall radio tower and drops his screwdriver. Assuming no air resistance, how long will it take to hit the ground in seconds?
Answer:
9.68 seconds
Explanation:
To answer the question, we will use the following equation for the uniformly accelerated motion:
[tex]x=v_0t+\frac{1}{2}at^2[/tex]Where x is the distance travel by the object, v0 is the initial velocity, a is the acceleration and t is the time.
Since, the man drops his screwdriver, x = 1500 ft, v0 = 0 ft/s and a = -32 ft/s².
Then, replacing the values, we get:
[tex]\begin{gathered} -1500=0t+\frac{1}{2}(-32)t^2 \\ -1500=\frac{1}{2}(-32)t^2 \end{gathered}[/tex]Then, solving for t, we get:
[tex]\begin{gathered} -1500=-16t^2 \\ \frac{-1500}{-16}=\frac{-16t^2}{-16} \\ 93.75=t^2 \\ \sqrt[]{93.75}=t \\ 9.68\text{ s = t} \end{gathered}[/tex]Therefore, the screwdriver takes 9.68 seconds to hit the ground.
How far away from a canyon wall are you if it takes 2.29 seconds to hear your echo. (Assume the speed of sound in air is 343.33 m/s).
Distance between canyon wall and the person who hear the echo after 2.29 seconds is 786.23 meter.
What is echo?An echo is a sound that is partially or completely repeated as a result of REFLECTION. REVERBERATION is a type of reflected sound, although in this instance, it is impossible to tell apart individual repetitions of the original sound. They are also used in SONAR (Sound navigation and ranging) and RADAR(Radio detection and ranging).
Given that in the question it takes 2.29 seconds to reach the person speed of sound in air is 343.33 m/s, so the distance between the person and the source of sound canyon is 786.23 m.
786.23 m far away from a canyon wall are if it takes 2.29 seconds to hear echo.
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two large boxes sit side by side on a sidewalk. the box on the left has a mass of 80kg and the box on the right has a mass of 50kg. a force is applied to the box on the left , such that both boxes accelerate to the right. draw a free body diagram for each box. include the force of friction
The force that prevents motion when the surfaces of two objects come into contact is known as friction. Friction decreases a machine's mechanical advantage, or, to put it another way, reduces the output to input ratio.
How can I figure out the frictional force?The resistive force of friction (Fr) divided by the normal or perpendicular force (N) pushing the objects together yields the coefficient of friction (fr), which is a numerical value.
The formula fr = Fr/N serves as a representation of it.
Therefore, 100N of force is needed to move an item with a mass of 50 kg.
It will accelerate by 10 m/s2.
If a substance's mass does not change over time, friction cannot affect it. Instead, friction can be affected in a variety of ways by an object's mass.
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What information is needed to calculate the gravitational force of an object? (1 point)
the mass of the two objects
O the distance between the two objects
the mass of the object and the planet's gravitational acceleration
O the mass of the object subtracted from the distance between the object and the planet's core
Answer:
C
Explanation:
the mass of the object and the planet’s gravitational acceleration
Answer:
1)the mass of the object and the planet’s gravitational acceleration
2)2.6 times less force
3)The Earth has a greater gravitational attraction than the Moon.
4)980 N
5)The force would need to be greater, so they would not perform as well.
I did it and have a 5/5 100%
2 The deposit cylinder of a teller drive-in window at a bank travels through the tube at a constant speed of 4 meters per second. If it takes 17 seconds to travel from the car to the teller. What is the length of the tube the cylinder travels through.
The length of the tube the cylinder travels through 68 m
Constant speed of Cylinder v = 4 m/s
acceleration of Cylinder a = 0 [tex]m/s^2[/tex]
time taken during travel t = 17 Seconds
Since acceleration is constant, hence as per the equation of motion
[tex]S = vt + \frac{1}{2}at^2[/tex]
[tex]S = 4\times17 + \frac{1}{2}(0)17^2[/tex]
S = 68 m
What is acceleration ?The acceleration is positive when the object is speeding up and negative when speeding down. According to Newton’s Second Law, the net unbalanced force which acts on the object causes this to happen. Thus, it can be said that acceleration is a vector quantity. It is so because it changes the time rate of change of velocity. Mainly, Uniform acceleration, non-uniform acceleration, and average acceleration are the three types of accelerated motions.
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Which of these cannot be done by a machine?
multiply force
multiply energy
change direction of a force
work
multiply energy of these cannot be done by a machine.
What kind of machine is it?The inclined plane, the wedge, the screw, the lever, the wheel and axle, and the pulley are six examples of primitive machines. Although several may function in a similar manner, these six have distinctive qualities and perform distinctive tasks.
A machine's role may be as simple as modifying and transmitting forces and motions, or it may include converting chemical, thermal, electrical, or nuclear energy into mechanical energy or vice versa. Every machine has an input, an output, as well as a device for altering, changing, and conveying information.
Any tool that simplifies work by adjusting a force is a machine. Machines may broaden the area over which a force is delivered or enhance the force's power.
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All measurements are subject to some uncertainty. Is this true or false?
All measurements in the measured with some uncertainity which is regardless of the accuracy considered while measurements.
This uncertainity reflects the incomplete knowledge or the systematics errors due to the instruments used.
Hence, the given statement is true.
The length of the displacement vector represents how far an object
Answer:
The displacement vector from one point to another is an arrow with its tail at the first point and its tip at the second. The magnitude (or length) of the displacement vector is the distance between the points and is represented by the length of the arrow
How much momentum does a 2500 kg mass moving at21. m/s have?kg*m/s (Round to 2 significant figures)
The momentum can be calculated with the following formula:
[tex]p=mv[/tex]Where m is the mass and v is the velocity.
So, for m = 2500 kg and v = 21 m/s, we have:
[tex]\begin{gathered} p=2500\cdot21 \\ p=52500 \end{gathered}[/tex]Rounding to 2 significant figures, we have a momentum of 53000 kg*m/s
