Answer:
People should show appreciation for what the speaker is saying.
Explanation:
Radium has a half-life of 1,660 years. Calculate the number of years until only 1/16th of a sample remains.
years
Radium has a half-life of 1,660 years.The number of years until only 1/16th of a sample remains is 6641 years.
Answer: 6641 years
Explanation:
Given that the half-life of Radium is 1660 years. The number of years to be calculated when the sample of radium could just be remained of 1/16th of its part, which can be calculated by the following means,
Half life, [tex]T_{1 / 2}=1660 \text { years }[/tex]
[tex]\frac{N}{N_{0}}=\frac{1}{16}[/tex]
t is the taken time, then,
[tex]\frac{N}{N_{0}}=e^{-\lambda t}[/tex]
[tex]\frac{N}{N_{0}}=e^{\lambda t}[/tex]
Taking ln on both sides, we get,
[tex]\lambda t=\ln \left(\frac{N}{N_{0}}\right)[/tex]
[tex]t=\frac{1}{\lambda} \ln \left(\frac{N_{0}}{N}\right)[/tex]
[tex]=\frac{T_{1 / 2}}{0.693}\left(\ln \left(\frac{N_{0}}{N}\right)\right)[/tex]
By substituting the given values,
[tex]t = \frac{1660}{0.693}(\ln 16)[/tex]
Therefore, t = 6641 years
PLEASE HELP BRAINLIEST + POINTS'
How much work is done by a 100W engine in 120s? P = W/t
Question 15 options:
120 J
12,000 J
1200 J
.833 J
For this case we have that by definition, physical power refers to the amount of work done for a unit of time.
So:
[tex]P = \frac {W} {t}[/tex]
Where:
W: It's the work
t: It's time
The power units are in [tex]\frac {Joules} {s} = Watts[/tex]
So, according to the problem data we have:
[tex]P = 100W\\t = 120s[/tex]
Clearing the work of the formula:
[tex]W = P * t\\W = 100 * 120 = 1200[/tex]
Thus, the work is 1200 joules.
Answer:
Option C
What is the weight of a text book whose mass is 2.4 kg measured on the moon? The gravitational acceleration on the moon is approximately 1/6 that on the earth.
Answer:
2.4 kg
1 kg = 10N
2.4 kg = ?
2.4 kg = 24N
On the moon 1/6th
1/6 * 24 = 4N
therefore weight of the textbook on the moon would be 4N
Give the general name for the type of quantity that has magnitude and acts in a particular direction.
Answer:
Vector quantity
Explanation:
physical quantity that has both magnitude and direction is called vector quantity.
Answer:
Vector
Explanation:
A vector is a quantity that is composed of a magnitude and a direction.
Some examples of vectors are forces. A force has a magnitude that indicates how large or small it is, and also has a direction that indicates where this force is being exerted.
Another popular example of a vector is velocity.
Which of the following is an example of the conclusion phase of the scientific method?
a scientists creates graphs and performs calculations
a scientist decides on a question to explore
a scientist collects data
a scientist examines the results and answers the lab question
Answer:
A scientist examines the results and answers the lab question.
Also in the conclusion write down what you learned from the experiment.
Answer:
the dude above me is right
Explanation:
he right
ad for the distance from the sun tothe earth is 1.5 x 10"m. how long does it take for light from ths sun to reach the eath? give your answer n seconds
Answer:
About 8.3 minutes
Explanation:
Use the formula for velocity as the distance covered by the light divided the time it takes: [tex][tex]velocity=\frac{distance}{time}[/tex][/tex]
Use the information about the speed of light in vacuum: [tex]300000000 \frac{m}{s} = 3*10^{8} \frac{m}{s}[/tex]
and the information you are given regarding the distance between Sun and Earth: [tex]1.5 * 10^{11} m[/tex]
to solve the first velocity equation for the unknown time "t":
[tex]velocity=\frac{distance}{time} \\3*10^8\frac{m}{s} =\frac{1.5*10^11 m}{t} \\t=\frac{1.5*10^11 }{3*10^8} s= 500 s[/tex]
we can convert second into minutes by dividing by 60: 500 s = 500/60 minutes = 8.3333... minutes
A vehicle moving with a uniform acceleration of 2 m/s2 has
a velocity of 4 m/s at a certain time. What will its velocity be
a 1s later,
b 5s later?
Answer:
a) 6 m/s
b) 14 m/s
Explanation:
Acceleration is change in velocity over change in time.
a) a = Δv / Δt
2 m/s² = (v − 4 m/s) / 1 s
v = 6 m/s
b) a = Δv / Δt
2 m/s² = (v − 4 m/s) / 5 s
v = 14 m/s
Jesseca’s material In what areas of the country should this material be marketed?
Answer: Somewhere with high temperatures.
Explanation:
Answer:
Because the material is meant to coat roofing shingles to keep houses cooler, the material should be marketed in areas that have high temperatures.
Explanation:
write a one or two summary paragraph discussing this experiment and the results use tye following questions 1 according to your data was your hypothisis correct be sure to refer your data when answering this question 2 summarize ang difficulties or probloms you had in performing the experiment thaf might have affected the results list at least two real world examples that apply the findings for this experiment
The experiment confirmed the initial hypothesis, supported by specific data points. Some difficulties encountered during the process could have affected the results. The findings of the experiment align with two real-world examples.
Explanation:In the experiment we conducted, we intended to test a specific hypothesis. After careful analysis of the obtained data, the results did indicate that our hypothesis was indeed correct. Observations and specific data points derived from the experiment including (insert statistical or observational evidence) clearly supports this conclusion.
The experiment was not without difficulties. Some of the issues encountered include (insert specific problems or difficulties), which might have affected some of our findings. Two real-world applications of our findings would be (insert example one) and (insert example two). These applications provide practical illustrations on why these findings contribute relevant information to our broader understanding the subject matter.
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A bicycle traveled 150 meters west from point A to point B. Then it took the same route and came back to point A. It took a total of 2 minutes for the bicycle to return to point A. What is the average speed and average velocity of the bicycle?
Answer:
2.5 m/s
0 m/s
Explanation:
Average speed is distance over time.
Average velocity is displacement over time.
The bicycle travels 150 meters from A to B, then 150 meters from B to A. So the distance is 300 meters and the displacement is 0 m.
s = 300 m / 120 s = 2.5 m/s
v = 0 m / 120 s = 0 m/s
Need help asap pls!!!
Select all that apply.
The moon _____.
orbits the sun
has no atmosphere
rotates and revolves in the same amount of time
controls the Earth's ocean tides
has less gravity than Earth
Answer:
a,d,e
Explanation:
all of those are true for it orbits the earth witch orbits the sun
the moon has no atmosphere for if it did then there would be a higher chance for water and plants on the moon
the moon is less deans than the earth and its gravitational pole is 1.62 m/s^2
and in your text book it says Tides are the daily rise and fall of sea level at any given place. The pull of the Moon’s gravity on Earth is the primary cause of tides and the pull of the Sun’s gravity on Earth is the secondary cause. The Moon has a greater effect because, although it is much smaller than the Sun, it is much closer. The Moon’s pull is about twice that of the Sun’s
Answer:
A. B. D. E.
Explanation:
all of those are true for it orbits the earth witch orbits the sun
the moon has no atmosphere for if it did then there would be a higher chance for water and plants on the moon
the moon is less deans than the earth and its gravitational pole is 1.62 m/s^2
and in your text book it says Tides are the daily rise and fall of sea level at any given place. The pull of the Moon’s gravity on Earth is the primary cause of tides and the pull of the Sun’s gravity on Earth is the secondary cause. The Moon has a greater effect because, although it is much smaller than the Sun, it is much closer. The Moon’s pull is about twice that of the Sun’s.
In your own words, explain red shift and blue shift. Use at least two complete sentences to write your answer.
Answer:
Redshift and blueshift show how light shifts to shorter or longer wavelengths as objects in space move closer of farther away from us. People looking at an object that is moving away from them see light that has a longer wavelength than it had when it was produced (a redshift), while people looking at an source coming closer see light that is shifted to shorter wavelength (a blueshift).
A 4.5 kg bowling ball rolls down a 500m hill. How much potential energy does it lose?
Answer:
22050 J
Explanation:
Given Mass of the ball, m = 4.5 Kg
Height, h =500 m
Acceleration due to gravity, [tex]g= 9.8m/s^{2}[/tex]
To calculate the potential energy we use formula,
[tex]PE = mgh[/tex]
Substituting the given values, we get
PE = 4.5× 9.8×500
=22050 J
The potential energy loss for a 4.5 kg bowling ball rolling down a 500m hill would be approximately 221325 Joules in an idealized scenario.
Explanation:The potential energy loss of an object rolling down a hill can be calculated using the formula for gravitational potential energy, PE = mgh, where m is the mass of the object, g is the gravitational acceleration (9.81 m/s² on Earth), and h is the height of the hill. So, for a 4.5 kg bowling ball rolling down a 500m hill, the potential energy loss would be PE = (4.5 kg) * (9.81 m/s²) * (500 m), which equals 221325 Joules. However, it's important to note that this is an idealized calculation and in real scenarios some of this energy would be transferred into other forms such as kinetic energy as the ball speeds up, and thermal energy due to friction.
Relevant concepts: Potential Energy, Kinetic Energy, and Gravitational Potential Energy.
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Which scientist first proposed physical laws to mathematically describe the effect of forces on the motions of bodies?
Answer:
Issac Newton!
Explanation:
Hope this helps.
Answer: Isaac Newton
Explanation:
Isaac NewtonThe three laws of motion were first compiled by Isaac Newton in his Philosophiæ Naturalis Principia Mathematica (Mathematical Principles of Natural Philosophy), first published in 1687. Newtonused them to explain and investigate the motion of many physical objects and systems.Feb 21, 2017
you have a 200 kg bag being lifted with a block and tackle. If you pull with 100 newtons what is the MA of the system?
Answer:
The mechanical advantage of the system is equal to 19.62
Explanation:
The ratio of the force produced by a machine to the force applied to it is called mechanical advantage. In other words it is the ratio of output force to the input force.
In this problem mass=200kg
applied force=100N
input force=100N
output force=[tex]mg=200 \times 9.8=196N.[/tex]
mechanical advantage [tex]MA= \frac{1960}{100}=19.6[/tex]
It gives an idea about the efficiency of a mechanical device. It is indeed a measure of force amplification. In block and tackle system an assembly of ropes and pulleys is used to lift loads. When the moving block is supported by a greater number of rope sections the force amplification will be more.
Answer:
19.6
Explanation:
MA=Ouput/Input
To get output value multiply; 200 (which is the mass) * 9.8 (which is gravity)
So, 200*9.8=1960N
Input is 100 because that is the force you are putting into the bag
Back to our formula MA=Output/Input, enter in our values...
MA=1960/100
Now divide 1960/100=19.6
MA=19.6
(no units; they cancel out).
2016 Physics A-CR
In which situations is elastic potential energy present? Check all that apply.
A bow is drawn back from its equilibrium position.
An arrow rests on a bow.
O A spring toy dart gun is unloaded.
A spring toy dart gun is loaded with a dart.
A bungee cord is connected to a tall tower.
A bungee cord is stretched with a person at the end.
Answer:
A bow is drawn back from its equilibrium position.
A spring toy dart gun is loaded with a dart.
A bungee cord is stretched with a person at the end.
Explanation:
All of these examples have to do with the elastic object being stretched but not in motion, therefore they have stored energy, or potential energy.
Answer:
A bow is drawn back from its equilibrium position.
A spring toy dart gun is loaded with a dart.
A bungee cord is connected to a tall tower.
A bungee cord is stretched with a person at the end.
Explanation:
Potential energy is defined as the energy a material posesses by it viture of position. elastic potential potential energy is a special case of potential energy which is defined as the potential energy that is stored in material that are elastic. Elastic is connected with stretching and so looking at the options , option 2 and 4 are out of the lists
If Joey ran 60 meters in 10 seconds, then his velocity is ________ m/s.
Answer:
6
Explanation:
List two things you should not do when giving a presentation
Answer:
running or skipping
Explanation:
feelin yourself and talking to quiet
just stay still and talk with a decent voice but no too loud
define average velocity and instantaneous velocity when are they same
Answer:
Look to the explanation
Explanation:
Average velocity: is the average rate of change of displacement with
respect to time
Average velocity is a measure for distance traveled in a given time
We can calculate the average velocity by the rule [tex]v=\frac{s}{t}[/tex]
where s is the displacement and t is the time
Instantaneous velocity: is the velocity of an object in motion at a
specific point (x , t)
instantaneous velocity is the limit of velocity as the change in time
approaches zero
We can calculate the instantaneous velocity by the rule [tex]v=\frac{ds}{dt}[/tex]
Average velocity is equal to the instantaneous velocity when
acceleration is zero
During a baseball game, a batter hits a high
pop-up.
If the ball remains in the air for 6.37 s, how
high does it rise? The acceleration of gravity
is 9.8 m/s2.
Answer:
50.0 m
Explanation:
First of all, we can find the initial velocity of the ball, using the equation
v = u + at
where
v = 0 is the velocity of the ball at the highest position
u is the initial velocity
[tex]a=g=-9.8 m/s^2[/tex] is the acceleration of gravity
[tex]t=\frac{6.37}{2}=3.19 s[/tex] is the time the ball took to reach the maximum height (half of the time it remained in the air)
Solving for u,
[tex]u=v-at=0-(-9.8)(3.19)=31.3 m/s[/tex]
Now we can find the maximum height using the other SUVAT equation:
[tex]v^2-u^2 = 2ad[/tex]
where d is the maximum height. Solving for d,
[tex]d=\frac{v^2-u^2}{2a}=\frac{0^2-(31.3)^2}{2(-9.8)}=50.0 m[/tex]
How does the energy of a system change during a phase change?
Answer:
They are changes in bonding energy between the molecules. If heat is coming into a substance during a phase change, then this energy is used to break the bonds between the molecules of the substance. ... At the moment of melting the average kinetic energy of the molecules does not change.
Explanation:
Which word identifies a large natural or human-made lake used to supply water?
marsh
pond
reservoir
wetland
Answer:
reservoir. C
Explanation:
Just took the test on edge 2020
A large natural or human-made lake used to supply water is a reservoir.
What is a reservoir?A reservoir is a large area of land or even a container where things especially water is stored for future use.
A reservoir of water can be natural or man-made.
It is usually found underground or on the surface.
Therefore, a large natural or human-made lake used to supply water is a reservoir.
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(please help ;-;) Which of the following statements about the water cycle is true?
Organisms in the biosphere do not influence the water cycle.
The water cycle only continues during daylight hours.
Plants play a vital role in the water cycle.
Precipitation that falls to the ground ends up only as groundwater.
Answer:
I guess that the answer is plants play a vital role In the water cycle.
Answer:
Plants play a vital role in the water cycle.
Explanation:
Vegetation plays an important role in the water cycle by preventing soil erosion and increasing groundwater levels. In areas with thick vegetation cover, the foliage cover breaks the force of precipitation falling on the ground, which may otherwise cause erosion.
3. If a car accelerates from rest at a constant 5.5 m/s, how long will it take for the car to reach a
velocity of 28 m/s?
Answer: 2.54 s
Explanation:
If we are talking about a constant acceleration, we can use the following equation:
[tex]V_{f}=V_{o}+2at[/tex]
Where:
[tex]V_{f}=28 m/s[/tex] is the final velocity of the car
[tex]V_{o}=0t[/tex] is the finitial velocity of the car (it started from rest)
[tex]a=5.5 m/s^{2}[/tex] is the constant acceleration of the car
[tex]t[/tex] is the time it takes to reach [tex]V_{f}[/tex] with the given constant velocity
Hence:
[tex]V_{f}=2at[/tex]
Clearing [tex]t[/tex]:
[tex]t=\frac{V_{f}}{2a}[/tex]
[tex]t=\frac{28 m/s}{2a(5.5 m/s^{2})}[/tex]
Finally:
[tex]t=2.54 s[/tex]
Final answer:
It takes approximately 5.09 seconds for the car to accelerate from rest to a velocity of 28 m/s with a constant acceleration of 5.5 m/s².
Explanation:
To determine the time it takes for a car to reach a certain velocity with a given acceleration from rest, we use the kinematic equation:
final velocity (v) = initial velocity (u) + acceleration (a) × time (t)
Given that the car starts from rest, the initial velocity u is 0 m/s. We are told the car accelerates at a constant rate of 5.5 m/s2 and we want to find the time when the car reaches a velocity of 28 m/s. Plugging in the values we have:
28 m/s = 0 m/s + (5.5 m/s2) × t
Solving for t, we get:
t = 28 m/s / 5.5 m/s2
t = 5.09 seconds (approximately).
So, it takes approximately 5.09 seconds for the car to accelerate from rest to 28 m/s at a constant acceleration of 5.5 m/s2.
Although the temperature gradient changes from region to region in the homosphere, there is one gradient that stays the same. it continues to decrease as you increase in altitude, no matter where you are in the homospere. what gradient?
Answer: the answer is air gradient
Explanation:
If the mass of a person is 600kg on Earth what is the persons mass on the moon
Answer:
The mass of the person would remain 600kg.
Explanation:
mass refers to the amount of matter in a particular object. therefore even though the moon has less gravitational force than the Earths, it still would have the same mass since the person is made up of the same amount of matter on Earth and in the moon.
when asked about weight, it would be 1000N. but in mass , same 600kg.
An engineer in a locomotive sees a car stuck
on the track at a railroad crossing in front of
the train. When the engineer first sees the
car, the locomotive is 270 m from the crossing
and its speed is 12 m/s.
If the engineer’s reaction time is 0.79 s,
what should be the magnitude of the minimum deceleration to avoid an accident?
Answer in units of m/s
2
.
Answer:
a=0.27637 m/s²
Explanation:
Hello,
You should remember that ;
Stopping distance=reaction distance + braking distance
First find the reaction distance which is that distance traveled from point of detecting danger to start of breaking process.
Formula: d=(s*r) where s is speed in m/s and r is reaction time in seconds
Given: s=12m/s and r=0.79 s
d= 12*0.79=9.48 m
Remaining distance to cover and stop
Where distance from locomotive to railroad crossing is 260, then remaining distance will be;
270m-9.48m=260.52 m
To get magnitude of minimum deceleration to avoid an accident you apply the formula:
v²=u²-2as
where
v= final speed = 0 m/s
u=speed of locomotive = 12 m/s
a=acceleration in m/s²
s=remaining distance to cover
v²=u²-2as
0²=12²-2*a*260.52
0=144-521.04 a
144/521.04= 521.04/521.04a
a=0.27637 m/s²
Hope this Helps!
(oof already know the answer but at less yall answer so i can add a brainliest) Is this true or false? Think about the differences between climate and weather and complete the following sentence:The short-term, constantly changing state of the air in an area is known as weather, while the conditions of an area over a long period of time is known as climate.
Answer:
True, the statement is correct
Answer:
True
Explanation:
Weather: It is the atmospheric condition for a small area over a short span of time. For example: cloudy weather. If one place is witnessing this condition it may or may not be same for all the places.
Climate: It refers to the atmospheric condition of an area over a long period of time for say a decade or a century. For example: the climate of the polar region is changing drastically and resulting in the reduction of glacial ice.
Select the correct answer. A meteor is approaching Earth. Which statement about its motion is true? A. The meteor travels upward relative to Earth. B. The meteor accelerates. C. The meteor is out of Earth’s gravitational force field. D. The meteor falls with a constant velocity.
The meteor accelerates is the true statement about motion when it is approaching Earth.
Answer: Option B
Explanation:
Meteor is referred as the rock or a body made of metal wandering in space. The earth has gravitational pull and when any object or anything comes by, it gets accelerated.
Similarly when a meteor approached the earth, it gets pulled by gravitational force acting upon the earth and it gets accelerated and is forced to move into the earth's field.
Answer:
the meteor accelerates
Time for some gravity! Except if have no idea what’s going on, could someone help? :)
Answer: number 2 I think is d all of the above
Explanation: the teacher explained it to the class that.
1). C
2). D
3). B
4). A
5). D
6). B
7). C
8). A
9). B
10). B