Answer:
a) Then net force acting on the wagon 30 [N] in a negative direction to the left
b)Acceleration of the wagon 3 m/s² in a negative direction to the left
Explanation:
The coordinates x and y show the positive direction in x-axis ( to the right) and negative direction to the left. In north-south direction positive y values are to the north and negative values to the south
The free-body diagram shows 4 forces acting
In y-axis:
The weight ( P = m*g = 10 [kg]*9,8 [m/s²] = 98 [N] negative
Normal reaction force Fn = P = 98 [N] positive ( surface is frictionless)
∑Fy = 0 P - Fn = 0 P = Fn = 98 [N]
In x-axis:
Boris pulling force to the right (positive ) 220 [N]
Natasha pulling force to the left ( negative) 250 [N]
∑Fx = m*a
220 [N] - 250 [N] = 10 Kg * a [N] = Kg * m /s²
-30 [kg*m/s²] = 10 * Kg * a
-30/10 = - 3 m/s² = a
Sign (-) means the direction of acceleration vector is to the left (the same direction of the movement )
Then net force acting on the wagon 30 [N] in negative direction to the left
Acceleration of the wagon 3 m/s² in negative direction to the left
name three substances that could be added to the water to make the steel needle to sink
Answer:
The steel needle floats on top of the water because of surface tension. Surface tension happens because the water molecules at the surface of the water are strongly attracted to each other more than they are to the air molecules above them. The water molecules make an invisible skin on the water’s surface that allows things like the needle to float on top of the water.
When soap is added to the water, the water molecules aren't drawn together as strongly. The soap molecules combine with the water molecules and lessen the liquid’s surface tension. The new attractions between the air, water, and soap molecules are weaker than the water-to-water attractions. As a result, the liquid’s surface is no longer strong enough to support the weight of the steel needle and the steel needle sinks.
Answer:
when a Steel Blade is placed on water horizontally just surface tension and the buoyancy will be able to balance the weight of the blade and it will float on the water surface you know the boy and she is not sufficient to make the Steel Blade float now if you are detergent what are the surface tension of water immediately decreases the surface tension no longer be able to balance The Blade and it will sink
hope it helps u
plz mark it as brainlist
a. In what frame of reference does special relativity apply?
b. In what frames must general relativity be used?
c. Describe what happens to time and length at speeds close to the speed of light.
Answer:
a. The Special relativity postulate states that the laws of physics apply in all inertia frames of reference
b. General relativity must be uses a curved space-time
c. Time is dilated for a stationary observer relative to one in motion
Time interval observed on an object in a moving frame of reference is less than the same interval observed on a stationary reference frame
[tex]\Delta t' = \dfrac{\Delta t}{\sqrt{1 - \dfrac{v^2}{c^2}}}[/tex]
Length is contracted
The length of a rod moving with a velocity relative to an observer will appear contracted by a factor [tex]\sqrt{1 - \dfrac{v^2}{c^2}}[/tex], in the direction of the motion.
Explanation:
Give reasons:
1. The unit of pressure is a derived unit.
Explanation:
The units of pressure is called derived units because it is simply derived from base unit which is distance and a derived unit which is force, which is derived from acceleration, a derived unit as well, and mass, a base unit. As we all know, work is defined as the force x distance. Thus making work a derived unit.
A ball is rolling down a hill so that it accelerates at 3 m/s2. If it starts from rest and reaches a velocity of 9 m/s at the bottom of the hill, how long is the hill?
Answer:
13.5 m
Explanation:
Given:
v₀ = 0 m/s
v = 9 m/s
a = 3 m/s²
Find: Δx
v² = v₀² + 2aΔx
(9 m/s)² = (0 m/s)² + 2 (3 m/s²) Δx
Δx = 13.5 m
A substance has a mass of 15,000 kg and a volume of 30 m 3 . What is the density of the
substance?
Answer:
500 kg/m^3
Explanation:
equation ; p = m / v
m = 15,000
v = 30
p = 15,000 / 30, p = 500, add units at the end!
Hope this helps!!
12. Prove that v' = u? + 2as.
Prove that v² = u² + 2as .
Solution:-From first equation of motion,
v = u + at
=> at = v - u
=> t = v - u / a
From the second equation of motion, we have
s = ut + 1/2at²
Putting the value of t in above equation , we get:
s = u ( v - u /a ) + 1/2 a ( v - u/a )²
s = uv - u² / a + a( v² + u² - 2uv / 2a²)
s = uv - u² / a + v² + u² - 2uv / 2a
s = 2uv - 2u² + v² + u² - 2uv / 2a
2as = v² - u²
Answer:
[tex] \boxed{ \boxed{ \orange{ \sf{see \: below}}}} [/tex]
Explanation:
[tex] { \underline{ \underline \bold{ \sf{ \blue{ {question \: }}}}}}[/tex]
[tex] \sf{ \bold{ \underline{ \: prove \: that \: {v}^{2} = {u}^{2} + 2as}}}[/tex]
[tex] \underline{ \underline{ { \bold{ \sf{ \purple{solution} }}}}}[/tex]
Let us assume a body moving with an initial velocity ' u '. Let it's final velocity be 'v' after a time 't' and the distance travelled by the body be 's'. We already have ,
[tex] \sf{v = u + at}[/tex] ⇒first equation of motion ( i )
[tex] \sf{s = \frac{u + v}{2} \times t}[/tex] ⇒second equation of motion ( ii )
Putting the value of t from ( i ) in the equation ( ii )
{ v = u + at
or , at = v - u
or, t = v-u / a }
[tex] \sf{s = \frac{u + v}{2} \times \frac{v - u}{a} }[/tex]
[tex] \sf{or \: s = \frac{ {v}^{2} - {u}^{2} }{2a} }[/tex]
[tex] \sf{or \: 2as = {v}^{2} - {u}^{2} }[/tex]
[tex] \sf{ \boxed{ \bold{ \: ∴ \: \: \: {v}^{2} = {u}^{2} + 2as}}}[/tex] ⇒ forth equation of motion
Hope I helped!
Best regards!!
What displacement do I have if I travel 10 m E, then 6 m W, then 12 m E? A. 16 m E B. 28 m E C. 28 m D. 16 m
Answer:
16m E
Explanation:
displacement=10m E-6m W+12m E=16m E
a group of students conducted several trials of an experiment to study forces and the acceleration they produce on a given object. the students decided to present the resulting data using a graph rather than a table.
which statement describes an advantage of presenting the data using a graph?
a. tables with many rows of data are not useful
b. tables cannot explicitly show the data from the investigation
c. graphs are more appealing than tables
d. graphs visually show the relationship between the variables under investigation
Answer:
d.
Explanation:
graphs visually show the relationship between the variables under investigation. Table of data shows the quantitative analysis while the graph shows the relationship between y-axis and x-axis. Both of them are important.
what are the abuses limitation and benefits of science (pls tell at least 5 each)
Answer: The generation of electricity using fossil fuels.e.g can lead to pollution which cause harm to human beings and environment.
At some times science and technology have been misused or abused by human beings.An example of abuse is the invention of and use of deadly weapons which are harmful to us and environment.
Explanation:
What would most likely cause an accident if worn in a lab? short sleeves short hair long jewelry long pants
Answer:
Long jewelry
Explanation:
based on what you have just read,why is studying atoms and their parts and particles helpful to people
The study of atomic structure helps us understand more about the way the universe is constructed, how our bodies are made, and the components of life, which we can apply to other sciences in the fields of health and disease prevention, fuels, product industry etc... It basically helps us to understand how we can make new things and how to utilize the power of the universe.
Answer: Studying atoms is important because knowledge about atoms helps people to understand the world around them and produce materials used in daily life. Also, research done on atoms has contributed to the improvement of people's lives through medicine, to the protection of the environment, and to the discovery of new things about the world and the universe.
Explanation:
I did the test
If you drive 125 km in 2 hours, what is your average speed
Formula: s = d/t
s = speed
d = distance
t = time
Solve using the values we were given.
s = 125/2
S = 62.5km per hour
Best of Luck!
Consider the pendulum. At what point is the kinetic energy the greatest?
Answer:
B
Explanation:
B is the mean position.At the mean position, the velocity of the particle in S.H.M. is maximum and displacement is minimum, that is, x=0. Therefore, K.E. = 1/2 k ( a² – x²) = 1/2 k ( a² – o²) = 1/2 ka². Thus, the maximum kinetic energy is expressed by K.E = ½ ka²
Answer:
Point B is the location of the greatest kinetic energy. This is the point where the pendulum is moving with the greatest velocity.
Explanation:
Identify two properties of a star that can be determined from its spectral class
Answer:
temperature and relative motion
Explanation:
What steps should be taken when using a fire extinguisher? pull, aim, squeeze, spread pull, arm, search, spread push, aim, spread, squeeze push, arm, spread, search
Answer: pull,aim,squeeze,spread
Explanation:
determine the density in si unit of a solid of mass 40g with dimension 30cm by 4cm by 3cm
Answer:
Density = 0.111 g/cm^3
Explanation:
Given that
Make m = 40g
The given dimension are 30cm by 4cm by 3cm
Volume V = 30 × 4 × 3 = 360 cm^3
Density is the ratio of mass to volume.
That is,
Density = mass/volume
Substitute mass and volume into the formula
Density = 40/360
Density = 0.1111 g/cm^3
Describe three ways in which you used energy earlier today.
Answer:
turning on the lights
using my phone
using the microwave
A light beam with wavelength 500 nm is reflected constructively from a thin layer of oil having index of refraction 1.25. The oil floats on the top of water of index of refraction 1.33. What is the minimum thickness of the layer of oil
Answer:
t = 200 nm
Explanation:
It is given that,
Wavelength of a light beam is 500 nm
It is reflected constructively from a thin layer of oil having index of refraction 1.25.
The oil floats on the top of water of index of refraction 1.33.
We need to find the minimum thickness of the layer of oil. `
For constructive interference,
[tex]\dfrac{2nt}{\lambda}=m[/tex]
m is 1 for minimum thickness
n is refractive index of oil
t is thickness of layer of oil.
So,
[tex]t=\dfrac{m\lambda}{2n}\\\\t=\dfrac{1\times 500\times 10^{-9}}{2\times 1.25}\\\\t=2\times 10^{-7}\ m\\\\t=200\ nm[/tex]
So, the minimum thickness of the layer of oil is 200 nm.
Doland is currently driving his car at 10 m/s. He sees Gooby and accelerates at 20 m/s2 for 2 seconds until he passes him to scare
him. How far did Doland drive during that time.
Answer:
[tex]60\; \rm m[/tex].
Explanation:
Refer to the velocity-time diagram attached. The displacement of an object over a period of time is equal to the area of the region between the velocity-time plot and the horizontal time axis. That is the case even if the velocity of the object is changing over time.
For the car in this question, the distance travelled in that two seconds should be equal to the trapezoid highlighted in green. That's the region bounded with:
on the top: the velocity-time function of this car, on the two sides: the start and end of the acceleration ([tex]\text{Time} = 0\; \rm s[/tex] and [tex]\text{Time} = 2\; \rm s[/tex],) as well as on the bottom: the horizontal time axis.The formula for the area of a trapezoid is:
[tex]\displaystyle \text{Trapezoid Area} = \frac{1}{2}\times \text{Height} \times (\text{Upper Base} + \text{Lower base})[/tex].
For the imaginary trapezoid on this velocity-time graph:
Height: [tex]\text{Time taken} = 2\; \rm s[/tex].Upper base and lower base: [tex]\text{Initial velocity} = 20\; \rm m \cdot s^{-1}[/tex] and [tex]\text{Final velocity} = 20\; \rm m \cdot s^{-1} + 2\; \rm s \times 20\; \rm m \cdot s^{-1} = 50\; \rm m \cdot s^{-1}[/tex].Therefore:
[tex]\begin{aligned}&\text{Displacement} \\ &= \text{Area of the imaginary trapezoid}\\ &= \frac{1}{2} \times 2\; \rm s \times \left(10\; \rm m \cdot s^{-1} + 50\; \rm m \cdot s^{-1}\right)\\ &= 60\; \rm m\end{aligned}[/tex].
A snowmobile moves according to the velocity-time graph shown in the drawing. What is the snowmobile's average acceleration during (a) segment A, (b) segment B, and (c) segment C?
Answer:
(a). The average acceleration during segment A is 2 m/s²
(b). The average acceleration during segment B is zero.
(c). The average acceleration during segment C is 4 m/s².
Explanation:
Given that,
A snowmobile moves according to the velocity-time graph ,
(a), We need to calculate the average acceleration during segment A
Using formula of average acceleration
[tex]a=\dfrac{v_{f}-v_{i}}{t_{2}-t_{1}}[/tex]
Where, [tex]v_{i}[/tex] = initial velocity
[tex]v_{f}[/tex] =final velocity
[tex]t_{i}[/tex] = initial time
[tex]t_{f}[/tex] =final time
Put the value into the formula
[tex]a=\dfrac{40-0}{20-0}[/tex]
[tex]a=2\ m/s^2[/tex]
(b). We need to calculate the average acceleration during segment B
Using formula of average acceleration
[tex]a=\dfrac{v_{f}-v_{i}}{t_{2}-t_{1}}[/tex]
Put the value into the formula
[tex]a=\dfrac{40-40}{50-20}[/tex]
[tex]a=0\ m/s^2[/tex]
(c). We need to calculate the average acceleration during segment C
Using formula of average acceleration
[tex]a=\dfrac{v_{f}-v_{i}}{t_{2}-t_{1}}[/tex]
Put the value into the formula
[tex]a=\dfrac{80-40}{60-50}[/tex]
[tex]a=4\ m/s^2[/tex]
Hence, (a). The average acceleration during segment A is 2 m/s²
(b). The average acceleration during segment B is zero.
(c). The average acceleration during segment C is 4 m/s².
A 1200 kg car is put into neutral and pushed by 2 students. The first student pushed the car forward with 200 N of force. The second student pushed with 250 N of force in the same direction. What is the acceleration the car experienced.
Explanation:
∑F = ma
200 N + 250 N = (1200 kg) a
a = 0.375 m/s²
A 1200 kg car is put into neutral and pushed by 2 students. The first student pushed the car forward with 200 N of force. The second student pushed with 250 N of force in the same direction, then the acceleration of the car would be 0.375 meters / second².
What is Newton's second law?Newton's Second Law states that The resultant force acting on an object is proportional to the rate of change of momentum.
As given in the problem if A 1200 kg car is put into neutral and pushed by 2 students. The first student pushed the car forward with 200 N of force. The second student pushed with 250 N of force in the same direction, then we have to find the acceleration of the car,
Acceleration of the car = 450 /1200
= 0.375 meters / second²
Thus, the acceleration of the car would be 0.375 meters / second².
To learn more about Newton's second law here, refer to the link;
brainly.com/question/13447525
#SPJ2
During which step of the scientific method does a scientist make an educated
guess about the outcome of an experiment?
A. Collect data
B. Form a hypothesis
C. Analyze the results
D. Design an experiment
Answer:
form a hypothesis
Explanation:
You find a micrometer (a tool used to
measure objects to the nearest 0.001 mm) that has
been badly bent. How would it compare to a new,
high-quality meterstick in terms of its precision? Its
accuracy?
Explanation:
A micrometer is a measuring device or an instrument which is used to measure very minute measurements very accurately and precisely. It is mathematical tool used to provide accurate measurement for any mechanical components.
Now, if the micrometer that I have found is badly bent, it would provide faulty or wrong measurements both in terms of precision and accuracy when compared to a high quality meter stick.
What role do decisions play in wellness?
Answer: If you make certain decisions like changing your diet (for good or worse) increasing physical activity, or playing more video games, things like these can affect your wellness and health for the worse or better.
Answer:
health is the answer to what the role is play in wellness
A football coach walks 10 meters eastward and then 18 meters westward and then 22 metered East ward and finally 34 meters westward
Well you never specified what you're asking... however, this might help you learn the concepts of displacements and magnitude.
: The official displacement formula is as follows: s = sf - si. s = displacement; si = initial position; sf = final position
magnitude is the quantitative value of seismic energy. It is a specific value having no relation with distance and direction of the epicentre.
the magnitude of a vector in any dimension. For a 2d vector the formula is [math]|z| = \sqrt{x^2+y^2}[/math], where x and y are the x and y components of the vector respectively.
Answer:
Distance= 84 meters
Displacement= 20 meters
Direction= West
Explanation:
The starting position we know is 10 meters eastward and the final position is 18 meters westward. Remember the equation for displacement is Delta=final position minus the initial position. So its 18-10=8. The next equation that we would have to solve would be 22-8, because our starting position is 8 meters and our final position is 22, so final minus the initial remember. Then 22-8=14. Finally the last equation we would have to solve would be 34-12, again our initial position is 12 meters and our final position is 34 meters, therefore the answer to 34-14=20. So we end up with our displacement as 20 meters and don't forget to include the direction, which is West.
What is the velocity of a worm moving 1 meter in 2 hours to the East?
Answer:
Velocity = 0.0001389 m/s
Explanation:
Given that the
Distance covered = 1 metre
Time taken = 2 hours
Convert the hour to second
1 hour = 60 × 60 = 3600
2 hours = 2 × 3600 = 7200
What is the velocity of a worm moving 1 meter in 2 hours to the East?
Velocity can be referred as speed.
Velocity = distance/ time
Velocity = 1/7200
Velocity = 0.0001389 m/s
Pelo nossa observaçao do cotidiano,podmos perceber facilmente que se uma pedra for largada do alto de um predio , ele ira se deslocar em direçao ao solo ,enquanto que a fumaça produzida pela queima da madeira sobe para os ceus. Como aristosteles explicava estes movimentos?
Answer:
Esses movimentos são movimentos naturais.
Explicação:
Se uma pedra cair do topo de um telhado ou edifício, a pedra se moverá em direção à terra, enquanto a fumaça produzida devido à queima da madeira vai para cima, então de acordo com Aristosteles esses tipos de movimento são chamados de movimento natural porque de acordo à definição de movimento natural que não requer nenhuma força, então esses dois movimentos também se movem na direção para baixo e para cima sem usar qualquer força, então podemos dizer que esses movimentos são naturais.
some answer now hurry
Answer:
Hee answer is B
Explanation:
____________.
Joey drives along the 110 South freeway and notices a mile marker that reads 260 miles. He drives until he reaches the 150 mile marker. He realizes that he went too far, so gets on the 110 North to the 175 mile marker. What is Joey’s displacement from the 260 mile marker?
Answer:
85 miles .
Explanation:
Displacement along the 110 South freeway = 260 - 150 = 110 miles
Displacement along the 110 North freeway = 150 - 175 = - 25 miles
Net displacement = 110 - 25 = 85 miles
So Joey's displacement from the 260 mile marker is 85 miles .
when the piston of a fountain pen with a nib is dipped into ink and and the air is released by pressing it, the ink fills in the pen. why . give reason
Answer: Please find the answer in the explanation
Explanation: According to the Newton 3rd law of motion which state that;
In every action, there will be equal and opposite reaction.
when the piston of a fountain pen with a nib is dipped into ink and and the air is released by pressing it, a force is applied which act on the molecules of the ink by pushing the molecules. When the force is released, there will be a reaction force by pulling the molecules of the ink into the pen. Thereby the ink fills in the pen.