Answer:
speed = radius x angular velocity
= 0.7/2 x 10
= 3.5 m/s
2. Two children play a game of catch, running back and forth to catch each throw from the other. Assume the children are standing 5m apart with one child standing at the origin before the game begins.
The ball makes the following motions:
5 meters right, 8 meters left, 3 meters right, 6 meters left, 15 meters right, and 4 meters left.
Part A:
Calculate the total distance traveled by the child on the left.
Part B:
Calculate the total displacement of the child on the right.
Answer:
Part A: 24 m
Part B: 9 m
Explanation:
Part A:
The children takes turns so the child on the left moves with when the ball moves 5 meters right, 3 meters right, 15 meters right, while the child on the right moves with when the ball moves 8 meters left, 6 meters left, 4 meters left
The total distance traveled by the child on the left is given by the relation;
Initial position of the child on the left = 5 m
First motion of the child on the left = Distance to origin + first distance ball moved
∴ First motion of the child on the left = 5 + 5 = 10 m location of child = 5 m left
Second motion of the child on the left = location of child - position of the ball = 5 - (5 - 8 + 3) = 5 m left location of the child = 0 m
Third motion of the child on the left = location of child - position of the ball = 0 - (6 - 15) = 9 m right
Total distance traveled by the child on the left = 10 + 5 + 9 = 24 m
Part B:
First motion of the child on the right = Distance of child to origin + second position of ball
Initial location of the child on the right = 0 m
∴ First motion of the child on the right = 0 + (5 - 8) = -3 m location of child = 3 m left
Second motion of the child on the right = location of child - current position of the ball = 3 - 6 = -3 m left location of the child = -6 m
Third motion of the child on the right = location of child - position of the ball = -6 - 5 = 11 m right
Final location of the child on the right = 9 m right
Total displacement of the child on the right = Final location of the child on the right - Initial location of the child on the right 9 - 0 = 9 m.
Name 3 things that can be taken to reduce erosion and keep our topsoil healthy?
Answer:
Caution with grazing, recreational activities and reclaiming used lands can reduce erosion. For example, drain the soil if it collects standing water. Stay off wet soil. And, carefully fertilize your soil
Explanation:
2. How much current is in a circuit that includes a 1.5-volt battery and a
bulb with a resistance of 2 ohms?
Answer:
V = IR
I = V/R
= 1.5 / 2
= 0.75 A
MRU(movimiento rectilineo uniforme) un movil viaja en linea recta con una velocidad media de 12metros /segundos durante 9segundos y luego con una velocidad media de 4.8metros/segundos durante 7 segundos siendo ambas velocidades al mismo sentido. a) cual es el desplazamiento total del viaje de 16 segundos? b) cual es la velocidad media del viaje completo?
Answer:
a) 141.6m
b) 8.4m/s
Explanation:
a) to find the total displacement you use the following formula for each trajectory. Next you sum the results:
[tex]x_1=v_1t_1=(12m/s)(9s)=108m\\\\x_2=v_2t_2=(4.8m/s)(7s)=33.6m\\\\x_T=x_1+x_2=108m+33.6m=141.6m[/tex]
hence, the total distance is 141.6m
b) the mean velocity of the total trajectory is given by:
[tex]v_m=\frac{v_1+v_2}{2}=\frac{12m/s+4.8m/s}{2}=8.4\frac{m}{s}[/tex]
hence, the mean velocity is 8.4 m/s
what is the difference between transverse wave and longitudinal wave?
Answer:
Transverse waves are always characterized by particle motion being perpendicular to wave motion. A longitudinal wave is a wave in which particles of the medium move in a direction parallel to the direction that the wave moves.
as a car drives past a person standing on a sidewalk, the driver keeps a hand on the horn. how does the pitch of the horn differ for the driver and the person standing on the sidewalk?
Answer:
While the car is going towards the standing person on the sidewalk he is listening the pitch of the horn higher then it is.
When the car passes the person on the sidewalk and goes away, the horn's pitch become lower (for the person standing on the sidewalk).
For the driver, the pitch is always the same.
Explanation:
Is the doppler effect.
When the car is approaching, the sound waves must travel a smaller space than the previous one and they take less time to reach the standing person. So, sound waves reach the standing person with a higher frequency.
It happens the opposite when the car is going away: the sound waves need to travel more space and take more time to reach the person on the sidewalk. So, the frequency of the waves is lower.
The peak wavelength for the blackbody curve a star is in the UV range assuming the radiation from the star can reach earth would you be able to see it yes or no
Answer:
No
Explanation:
We would not be able to see the star because its radiation is in the UV range. For the star to be visible, it has to be in the visible spectrum of light for me to be able to see it with my eyes.
if someone feels intent on fighting with you, what should you do to prevent getting into a fight?
Answer:
avoid verbal argument and walk away
Water in the Antarctica usually exists as ice ,making it very difficult to use the water or conduct experiments reqiring the water to be in liquid state .A coffee addicted physisits stationed at a research base requires about 0.8 kg of ice for his coffe on the hour
Answer:
2730.304 KJ
Explanation:
How much heat is required to convert 0.8 kg of ice at -35°C into steam at 100 C?
Given that:
mass of ice (m) = 0.8 kg = 800 g
Initial temperature ([tex]T_i[/tex]) = -35°C = 238 K
final temperature ([tex]T_n[/tex])= 100°C = 373 K
Specific heat of ice ([tex]S_i[/tex]) = 2.108 J/g.K
Specific heat of water ([tex]S_w[/tex]) = 4.18 J/g.K
Latent heat of fusion ([tex]L_f[/tex]) = 334 J/g.
Latent heat of vaporization ([tex]L_v[/tex]) = 2230 J/g.
[tex]\Delta T=T_n-T_i=373-238=135K[/tex]
Total heat (Q) required to increase the temperature of ice from the initial temperature of 238K to final temperature of 373 K is given by the equation:
[tex]Q=m\Delta TS_i+m\Delta TS_w+mL_f+mL_v\\Q=800(135)*2.108+800(135)*4.18+800*334+800*2230\\Q=227664+451440+267200+1784000=2730304J\\Q=2703.304KJ[/tex]
Una lancha sube y baja por el paso de las olas cada 3.2 segundos, entre cresta y cresta hay una distancia de 24.5 m. ¿cual es la rapidez con la que se mueven las olas?
Answer:
7.656 m/s
Explanation:
El sonido viaja a cierta velocidad y tiene una frecuencia y longitud de onda. La relación entre la velocidad del sonido (V), su frecuencia (f) y la longitud de onda (λ) es la misma que para todas las ondas, está dada por la ecuación:
V = fλ
pero f = 1/T
∴ V = λ/T
donde T es el período
Dado que:
período (T) es el tiempo necesario para subir y bajar = 3.2 s
La distancia entre dos crestas es la longitud de onda (λ) = 24.5 m
V = λ/T = 24.5 / 3.2 = 7.656 m/s
V = 7.656 m/s
An ant is on the pendulum bob of a clock. What would be its displacement in one time period?
Answer: the displacement is 0
Explanation:
Displacement is defined as the difference between the final position and the initial position.
now, one time period is defined as the time that the pendulum needs to do a full cicle (so after one time period, the position of the pendulum returns to the same place) this means that the final position and the initial position is the same, then the displacement is 0.
Besides a rope, what other kinds of waves move as transverse waves?
Answer:
ocean waves and ripples from a stone being thrown in a pond.
Explanation:
A drive is driving a car at 36 km per hour. When he applies brake they cause a deceleration of 3 ms-2. If he takes 1s to apply the brakes ______is the distance travelled by the car during this period
A)16.67m
B)16m
C)21.75m
D)15
Answer:
I would say 16m because of the power some brakes have say if you were to be going at 100 miles it would stop in about 3 seconds.
Why is it important to study rocks?
Answer:
It is imjportant to study rocks because geology gives an untouvhed pice of our history. Rocks can tell about our past, whether it is weather, animals, plants, tools, climate, or anything else, rocks can help solve world problems.
What is one energy conversion that doesn’t help.
What is the most significant factor in determining kinetic energy?
Answer:
Mechanical energy is the total energy of the body is made up of scientific energy and potential synergy, these two can be converted into one another without needing help.
The most determining factor of kinetic anergy is speed since it is squared
Explanation:
Mechanical energy is the total energy of the body is made up of scientific energy and potential synergy, these two can be converted into one another without needing help. Kinetic energy is the energy of movement, increasing the speed of the body increases the kinetic energy.
The energy powers an energy from the system configuration when changing to a lower energy configuration this is converted into mechanical energy.
The most determining factor of kinetic anergy is speed since it is squared
A+block+of+1.2kg+is+placed+on+an+included+plane+at+60°+to+the+horizontal.+Calculate.+a.The+force+that+will+make+the+block+to+slide+down+the+plane.B.The+coefficient+of+friction+.C.+The+normal+reaction+d.+The+friction+force
Answer:
a. 10.2 N b. 1.73 c. 58.8 N d. 10.2 N
Explanation:
a. The force that will make the block slide down the plane
This is the component of the block's weight along the plane F = mgsinθ where m = mass of block = 1.2 kg, g = 9.8 m/s² and θ = angle of incline = 60°.
So, F = mgsinθ = 1.2 kg × 9.8 m/s² × sin60°.= 10.18 N ≅ 10.2 N
b. The coefficient of friction
The coefficient of friction, μ = tanθ = tan60° = 1.73
c. The normal reaction.
This is equal to the vertical component of the block's weight. So, F = mgcosθ. Substituting the values for the variables from above, we have
F = mgcosθ = 1.2 kg × 9.8 m/s² × cos60°.= 58.8 N
d. The frictional force
Since the block does not slide, there is no net force on it. If f is the frictional force, then
F - f = ma. Since a = acceleration = 0,
F - f = 0
f = F = mgsinθ = 1.2 kg × 9.8 m/s² × sin60°.= 10.18 N ≅ 10.2 N
Astronomers are comparing two stars that are known to have the same luminosity. Star A is observed to be 4 times brighter than star B. How far away is Star A compared to Star B?
It might be a good idea to talk to your parents about alcohol because:
might stumble upon this substance one day and be curious about what it does.
how is a runoff created
Answer:
Runoff occurs when there is more water than land can absorb
How fast is the van traveling relative to the ground
Answer:
5238747643782 mph
Explanation:
i assure u it is
which of the following us a surface phenomenon
Answer:
Evaporation
Explanation:
Evaporation is a surface phenomenon as the molecules of the surface gets sufficient energy to overcome the force of attraction which will help in converting to the vapor phase.
Balance the following chemical equations
Answer:
Enter an equation of a chemical reaction and click 'Balance'. The answer will appear below
Always use the upper case for the first character in the element name and the lower case for the second character.
To enter an electron into a chemical equation use {-} or e
To enter an ion specify charge after the compound in curly brackets: {+3} or {3+} or {3}. Example: Fe{3+} + I{-} =...
Substitute immutable groups in chemical compounds to avoid ambiguity. For instance equation C6H5C2H5 + O2 = C6H5OH + CO2...
Explanation:
After pulling the string tight, Miguel talked into his aluminum can. Brian could hear Miguel's voice through the aluminum can attached to the string. Which of the following best explains the sound Miguel made?
A.
The sound traveled through the air but not through the string.
B.
The sound traveled through the string but not through the air.
C.
The sound traveled through the string and the air at different speeds.
D.
The sound traveled through the string and the air at the same speeds.
Answer:
option C is correct✅✅✅✅✅
...............
Which action can be explained by physics?
Answer:
Actions that underlie mathematical rules, patterns or probability distributions.
For example how fast something falls at any given point or time.
More complex actions, such as human decision making in single individuals would be way too complicated to describe in physical terms.
But note that there can be physical models of such things as traffic when we can assume statistical knowledge of behavior.
Also physical models are used to plan such things as emergency exits in big stadiums, because many thousands of people can be described as particles flowing under a given pressure.
Every time we can gain good statistical knowledge and can therefore see patterns and rules in action, we can build theoretical models to make predictions and simulations (and games btw)
Since it's fair to say that mathematics is the science of patterns, it is plausible that physical descriptions often come in mathematical formulations, so that it can be understand as an efficient language of physics.
Neighboring disciplines like chemistry relay on physical theories to build on them,and then add shortcuts to fit their needs and interests, generating an own language for their field of study. But physicists may refer to them as anadd-on to physics.
Physics can basically explain all actions wich you can express in numbers.
But note that on a fundamental level physics describes 'how' things work, not necessarily 'why' they do it this way. The source of the basic and most fundamental physical constants and rules remains a mystery till this day.But of course there are theories on that as well, wich mostly can neither be proved or falsified.
The text is my own work and based of my general knowledge and quintessence of lectures on physics and other fields I attended.
(I would really appreciate the brainliest)
What part of the Milky Way allows for determination of its rotational direction? A. Celestial body B. Galactic body C. Galactic disk D. Two long tails
Answer: C. Galactic disk
Explanation:
The part of the Milky Way which allows the determination of it rotational direction is known as the Galactic disk. This disc are shaped because they contain gases which are rich and dynamically young. It is also a part of a group of a galaxies disc is a component of disc galaxies, known as spiral galaxies and lenticular galaxies.
Answer:
Galactic disk
Explanation:
Galactic disc's are composed mostly of the galaxy's stars and a gaseous component mostly composed of cool gas and dust. The stellar population of galactic discs tend to exhibit very little random motion with most of its stars undergoing nearly circular orbits about the galactic center. This circular orbit maintains the galaxy's rotation momentum.
The beginning of a river is called the
mouth
source
watershed
tributary
Answer:
head of water or mouth
Explanation:
hope this helpsAnswer:
The beginning of a river is called the source.
Explanation:
I got this correct on oddyseyware
8a.The mass of a girl is 40 kg. Calculate her weight. (g = 9.8 m/s)
b.The weight of a stone is 98 N. Calculate its mass. (g = 9.8 m/s)
Explanation:
Here,
Given,
Mass(m)=40 kg
Gram=9.8m/s
Now,
Weight=m x g
or, weight= 40x9.8
=392.0
Hope you have understood
Mark me as brainliest plz
Answer:
The right answer of 8 a is 392 Newton
The right answer of 8b is 10 kg
Look at the attached picture
Hope it will help you
Good luck on your assignment
The truck in which
you were seated sank
into the mud. You and
the person driving the
Vehicle want to lift the
truck using a branch.
You apply a force of
600 N to the branch
which acts as a lever.
The rear of the truck
weighs 2,400 N. What
is the mechanical
gain of the lever arm?
Answer:
m = 4
Explanation:
We have,
You apply a force of 600 N to the branch which acts as a lever. It means it is input force, IF = 600 N
The rear of the truck weighs 2,400 N. It means it is output force, OF = 2400 N
The ratio of output force to the input force is equal to the mechanical advantage of the lever arm. It is given by :
[tex]m=\dfrac{2400}{600}\\\\m=4[/tex]
So, the mechanical gain of the lever arm is 4.
what is the difference between an ordinary piece of iron and iron magnet?
Answer:
The difference between a piece of ordinary iron and an iron magnet is. The magnetic domains in an iron nail that is brought near a strong magnet. When an ordinary iron nail is removed from a strong magnet
Explanation:
How much net force is required to accelerate a 50.00kg mass at 4.00 m/s^2
Answer:
Explanation:
F = m*a = 50 * 4 = 200 N