Answer:
Rough surfaces have more microscopic hills and valleys than smooth surfaces do. So, the rougher the surface is, the greater the friction is.
a ball rolls from x 10m to x -25m in 2.5 seconds. What was its average velocity?
Answer:
2.5=10xm is the correct one
Explanation:
Answer:
-14
Explanation:
Which property of a substance indicates wheaten the substance is a liquid or a solid at room temperature
Answer:
physical property
Explanation: Some substances exist as gases at room temperature (oxygen and carbon dioxide), while others, like water and mercury metal, exist as liquids.
what types of forces can move an object?
What is the difference between catastrophism and uniformitarianism
Explanation:
Catastrophism is a geological concept or ideology that was formerly in place. It suggests that the earth crust has evolved through only drastic and violent geological events.
Uniformitarianism suggests that the earth carefully evolved over a period of time and that the processes that are occurring today have occurred in times past.
Catastrophism presents a drastic and rapid evolution of the crust. Uniformitarianism takes a gradual approach to events and suggests that we can use the present to unravel the past.A student lifts a 2 kg book from the floor to a desk that is 0.5 meters high. How much work does the student do?
Answer:
W = 9.8 J
Explanation:
Given that,
Mass of the book, m = 2kg
A student lifts it from the floor to a desk that is 0.5 meters high.
We need to find work done by the student. The work done in lifting the book is given by :
W = mgh
Put all the values,
W = 2 kg × 9.8 m/s² × 0.5 m
W = 9.8 J
So, the required work done is 9.8 J.
The process of cytokinesis is different in plant and animal cells. What structure is needed for a plant cell to go through cytokinesis?
Answer:
Cytokinesis occurs differently in animal and plant cells. In animal cells, the plasma membrane of the parent cell pinches inward along the cell's equator until two daughter cells form. In plant cells, a cell plate forms along the equator of the parent cell.
Explanation:
Rahul runs a distance of 12
km with an average speed of 4.5 km/h and
Rita runs 1.6 km within 15 minutes. Who
runs faster?
Answer:
Rita runs faster
Explanation:
To obtain the answer to the question given, we determine the speed of Rita. This can be obtained as follow:
Distance = 1.6 km
Time = 15 mins
Speed =?
Next, we shall convert 15 mins to hour. This can be obtained as follow:
60 mins = 1 h
Therefore,
15 mins = 15 mins × 1 h / 60 mins
15 mins = 0.25 h
Thus, 15 mins is equivalent to 0.25 h.
Finally, we shall determine speed of Rita as follow:
Distance = 1.6 km
Time = 0.25 h
Speed =?
Speed = distance / time
Speed = 1.6 / 0.25
Speed = 6.4 Km/h
Thus Rita's speed is 6.4 Km/h
Comparing the speed of Rahul and Rita
Rahul's speed = 4.5 km/h
Rita's speed = 6.4 Km/h
We can see that Rita's speed is greater than Rahul's speed. This simply indicates that Rita runs faster than Rahul.
Question 11 of 11
Which model best describes how gravity causes star formation?
A. A long spool of thread is unwound and then wound back up.
B. Two mugs crash into each other and break into many small
pieces.
C. A cup of water is dumped on the ground, where it forms a small
pool.
D. A snowball grows as more snow sticks to it.
Answer:
d
Explanation:
Answer:
D. A snowball grows as more snow sticks to it.
Explanation:
When a star is born, it’s fairly small. However, the stars gravitational pull brings more things (for lack of better term) into it therefore increases it’s size as a snowball would as more things (again, no better term) stick to it.
Hope this helps, it was a pleasure to make your acquaintance.
PLZ HELP ME
Global winds are found in each convection region. Because convection cells are in a set place in the atmosphere and the Earth is spinning on its axis, the winds appear to curve.
The apparent curving of the winds is called _______.
A.
the global wind effect
B.
the Coriolis effect
C.
the Curvature effect
D.
atmospheric curving
Answer:
C. the Curvature effect
Explanation:
The Coriolis effect is the apparent curvature of global winds, ocean currents, and everything else that moves freely across the Earth's surface. The curvature is due to the rotation of the Earth on its axis
Rose got out of bed and walked from her room to the bathroom 10 m/s in 2s. She was traveling southeast. What was her acceleration?
Answer:
Acceleration = 5m/s² Southeast
Explanation:
Given the following data;
Final velocity = 10 m/s
Time = 2secs
To find acceleration;
In physics, acceleration can be defined as the rate of change of the velocity of an object with respect to time.
This simply means that, acceleration is given by the subtraction of initial velocity from the final velocity all over time.
Hence, if we subtract the initial velocity from the final velocity and divide that by the time, we can calculate an object’s acceleration.
Mathematically, acceleration is given by the equation;
[tex]Acceleration (a) = \frac{final \; velocity - initial \; velocity}{time}[/tex]
[tex]a = \frac{v - u}{t}[/tex]
Where,
a is acceleration measured in [tex]ms^{-2}[/tex]
v and u is final and initial velocity respectively, measured in [tex]ms^{-1}[/tex]
t is time measured in seconds.
We know that Initial velocity = 0m/s
Substituting into the equation, we have;
[tex]a = \frac{10 - 0}{2}[/tex]
[tex]a = \frac{10}{2}[/tex]
Acceleration = 5m/s² Southeast.
Regardless of the method used to develop a scientific explanation, what does a scientist always look for?
1Trends or patterns
2proof of hypothesis
3a mathematical equation
4something never seen before
Answer:
2proof of hypothesis
Explanation:
A scientist is always on the look out for the proof of a hypothesis so as to validate their claim.
A hypothesis presented by a scientist is a testable idea. When the hypothesis is subject to a test, results are produced in form of data. The data is then analyzed to give the meaning which is the conclusion drawn So, the goal of a scientist is to find proof of their claim. The proof can come in many different forms or formatsA ball is falling from the sky down to the left. What two forces are being used?
Answer:
push and pull
Explanation:
i beleve good luck❤️❤️
Answer: Gravity for sure and...air resistance.
Explanation: I hope this is correct.
Select the correct answer.
Five locations are marked on the world map. Which location is most prone to hurricanes?
Answer: A
Explanation:
Location A represents the Caribbean region which is known for tourist attractions such as nice beaches. It is also known however, for devastating hurricanes.
Apart from mostly being islands, which puts them at risk of being in Hurricane paths, the Caribbean is warm and the air is moist. Hurricanes derive energy from these two things which is why Hurricanes attack the Caribbean rather frequently.
Answer:
Based off the picture the guy above showed me, the correct answer would be A
However, if you have a different map, choose the choice nearest to a body of water.
A boy is pushing a box on the ground to the right. What four forces is he using?
Answer: He is usining
Gravity,Drag, Tension, Direction
Explanation: please give me brainliest
The unit for acceleration is always
Explanation:
Because acceleration is velocity in m/s divided by time in s, the SI units for acceleration are m/s2, meters per second squared or meters per second per second, which literally means by how many meters per second the velocity changes every second. ... The quicker you turn, the greater the acceleration.
Please please help me. I will mark you as brainliest if you’re right !
1. What happens to the period of a pendulum and the period of a spring as the
amplitude of the oscillation increases? Briefly give an explanation for this
relationship. (5 points)
Answer:
The Pendulum falls but the longer the period or the back and forth swing the greater amplitude the oscillation depends on the amplitude
Explanation:
Which number would be 16,000 when rounded to the nearest thousand? *
15,472
15,518
16,511
16,739
why does a Ray of light passing through a glass slab not shown dispersion?
Answer:
After refraction at two parallel faces of a glass slab, a ray of light emerges in a direction parallel to the direction of incidence of white light on the slab. As rays of all colours emerge in the same direction (of incidence of white light), hence there is no dispersion, but only lateral displacement.
What occurs when air moves from an area of high pressure to an area of lower pressure
what is warmer 0 f or 0 c
ill give brainlist help pleaseee asap
Answer:
20. This is a transverse wave.
21. a is a Crest
b is the wavelength
c is the amplitude
d is the trough
e isthe amplitude
f is the wavelength
g is time
Explanation:
Write the equations of motions
Answer:
In physics, equations of motion are equations that describe the behavior of a physical system in terms of its motion as a function of time.[1] More specifically, the equations of motion describe the behaviour of a physical system as a set of mathematical functions in terms of dynamic variables. These variables are usually spatial coordinates and time, but may include momentum components. The most general choice are generalized coordinates which can be any convenient variables characteristic of the physical system.[2] The functions are defined in a Euclidean space in classical mechanics, but are replaced by curved spaces in relativity. If the dynamics of a system is known, the equations are the solutions for the differential equations describing the motion of the dynamics.
When acceleration is constant and motion is a straight line. The three equations of motion r
If a transverse wave has a velocity of 27.9 meters per
second and a wavelength of 200 meters, what is the waves
frequency?
Answer:
0.14Hz
Explanation:
Given parameters:
Velocity = 27.9m/s
Wavelength = 200m
Unknown:
Frequency of the waves = ?
Solution:
To solve this problem, we use the wave - velocity equation:
V = F ∧
V is the velocity
F is the frequency
∧ is the wavelength
Now, let us insert the parameters and solve;
So;
27. 9 = F x 200
F = 0.14Hz
Which object has more momentum?
1. Caterpillar resting on a leaf?
2. Sleeping bear?
3. Llarge butterfly in flight, flying through the air?
4. Ant walking in line?
Answer:
3. Large butterfly in flight, flying through the air?
Explanation:
Momentum is simply defined as the quantity of motion a body possess. It is mathematically given as;
Momentum = mass x velocity
The larger the mass, the larger the momentum and also the velocity
Since the large butterfly is in flight, it has the largest velocity.
A sleeping bear and resting caterpillar have no momentum because their velocity is 0
A man swings a bucket on a 120-cm rope with a tangential speed of 4.5 m/s. If the magnitude of the centripetal force is 25 N, what is the bucket’s mass?
Answer:
the buckets mass is 346g if im not mistaken
Explanation:
Mass of the bucket is 1.48kg
Centripetal force f=25N
Radius r=1.2m
speed v=4.5m/s
By the formula of centripetal force,
Centripetal force = mass x velocity2 / radius on putting the values
25= {m*4.5*4.5}{1.2}
m={250*12}{45*45}
={40}{27}
=1.48kg
The mass of the bucket is 1.48kg.
What is centripetal force?"The force acting on a body that moves in a circular path is called centripetal force. It acts towards the center of the circle."
Know more about centripetal force here
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You are freezing juice to make your own popsicles. Describe what happens on a molecular level as the juice freezes. Be sure to us e appropriate science vocabulary in your response.
Answer:
When water freezes to form ice, the molecules would be vibrating in place rather than moving round. It is a result of a decrease in the kinetic energy of the molecules of water. It is said that the temperature and the kinetic energy of the molecules is directly proportional which means that when temperature is increased, the kinetic energy of the molecules would increase as well making the molecules move around. However for this case, when we day the system is cooled then it means the temperature is decreased which would result to the decrease of the kinetic energy of the molecules.
List three ways light can be grouped based on how much light shines through or passes through them
Answer:
Materials can be classified based on the amount of light they transmit. Materials, which allow complete transmission of light, are called transparent. Any object can be seen through a transparent material. One example of transparent material is pure glass.
Explanation:
Does this help ?
Answer:
light, materials, and shadows
Explanation:
hope this helps have a good rest of your day :) sorry if incorrect
A car driving at 20 m/s accelerates continuously 2m/s2 for 3 seconds. What is its final velocity
Answer: V= u+ at
V= final velocity
u=initial velocity
a=acceleration
t=time taken
V= 20 + 2*3
V= 26m/s
Explanation:
What is babylonian ???? pls help
Answer:
Babylonia was an ancient Akkadian-speaking state and cultural area based in central-southern Mesopotamia. A small Amorite-ruled state emerged in 1894 BCE, which contained the minor administrative town of Babylon.
Explanation:
A 225kg race horse runs around the track with an acceleration or 13m/s2. What is the force needed by the horse?
Explanation:
The force acting on an object given it's mass and acceleration can be found by using the formula
force = mass × acceleration
From the question we have
force = 225 × 13
We have the final answer as
2925 NHope this helps you