Answer:
Rotation of a fluid particle can be caused only by a torque applied by shear forces on the sides of the particle. Since shear forces are absent in an ideal fluid, the flow of ideal fluids is essentially irrotational. Generally when the flow is viscid, it also becomes rotational
Why is evolution called a scientific theory?
PLEASE HELP!!!
I think it’s either c or d
Answer:
There is lots of evidence to support it, is the correct answer
The reason why evolution is regarded as a scientific theory is because there are lots of scientific evidences to support it.
Evolution refers to the scientific thinking that complex life forms came out of simple life forms. The complex sequence of events that occurred during the transformation of simple life forms to complex life forms are described by the theories of evolution.
The reason why evolution is regarded as a scientific theory is because there are lots of scientific evidences to support it.
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The force of attraction between things that have mass called_____. Someone please help
state Newton's laws of motion
Answer:
Newtons First Law (The Law of Inertia)- If an object is at rest it will stay at rest until a net force acts on it. If an object is in motion it will stay in motion until a net force acts on it.
Newtons Second Law (F=ma)- Force equals the mass of an object times it's acceleration.
Newton's Third Law- For every action there is an equal and opposite reaction.
hope this helps!
Identify two factors that determine the state of matter
the kinetic energies of the particles (atoms,molecule,or ions)that make up up a substance. kinetic energy tends to keep the particles moving apart.
the attractive inter molecular forces between particles that tends to draw the particles together.
Which of the following graphs represents the acceleration as a function of time of an object thrown straight up?
Answer
D)
Explanation:
Imagine throwing a ball upwards the ball will incress and then decrease make a arc shape.
The second graph represents the acceleration as a function of time of an object is thrown straight up, therefor the correct answer is option B
What is acceleration?The rate of change of the velocity with respect to time is known as the acceleration of the object. Generally, the unit of acceleration is considered as meter/seconds².
As given in the problem an object is thrown straight up and its acceleration vs time graph is plotted
As we know that the acceleration due to gravity is constant and always acts towards the center of the earth, when the object is thrown straight up its acceleration would remain constant due to the acceleration due to gravity. The acceleration due to gravity is constant with a value of 9.81 m/s²
Thus, The second graph represents the acceleration as a function of the time an object is thrown straight up, therefor the correct answer is option B
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calculate the magnitude of the current through a resistor of 5ohm when the voltage across the resistor is 40v
Explanation:
[tex]\huge\fbox\colorbox{pink}{❥Answer♡}[/tex]
Bella makes the 2.5m distance to her food bowl in 9.1 seconds. What is her average velocity?
Average Velocity=Total Distance/Total Time
[tex]\\ \sf\longmapsto \dfrac{2.5}{9.1}[/tex]
[tex]\\ \sf\longmapsto 0.3m/s[/tex]
If a river is flowing south at 4 m/s and you swim straight across (i.e. east) at 2 m/s; admittedly, you're going to drift a bit south. That said, calculate that distance that you drifted south from your starting point. The river is 16 m wide.
We have that the distance that you drifted south from your starting point is
[tex]\triangle y=32m[/tex]
From the question we are told that
a river is flowing south at 4 m/s
you swim straight across (i.e. east) at 2 m/s; admittedly
The river is 16 m wide
Generally the equation for the change in direction is mathematically given as
[tex]\triangle x = v_x t\\\\16=2*t\\\\t=8s[/tex]
Therefore
[tex]\triangle y = v_y t\\\\\triangle y=4*8\\\\\triangle y=32m[/tex]
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When a driver hits the brakes, his car decelerates from 50m/s at a uniform rate of 2.0m/s^2. His car stops after covering some distance. How long does it take him to stop?
Please find attached photograph for your answer. Please do comment whether it is useful or not.
Finally , what is this kinematics ??
xD
Answer:
study of force and motion
The distance traveled by an automobile moving at a constant velocity is
which of the following objects exhibit two-dimensional motion
Answer:
which objects? can you be more precise
Answer:
A. An object that's thrown horizontally off a cliff and allowed to fall
B. An object thrown upward at an angle Explanation:
An object exhibits a two-dimensional motion if it can be described by both x and y coordinate components.This means you can describe it using a vector with the horizontal and vertical components.For example,a graph of a body that moves with a constant velocity,the sum of the velocities in the x and y directions can describe this object's position.The same with kicking a ball.The ball will rise up at an angle, where you will have the horizontal component in the x-axis direction and the vertical component in the y-axis direction.
So for the case of this question, when an object is thrown horizontally, the horizontal component is initiated which will be represented by the x-axis vector.When it is allowed to fall down, the vertical component is initiated, in this case it will be a negative vector.An object thrown upward at an angle behaves like a ball kicked at an angle.
Which of the following can be excluded when evaluating the reliability of a source? (1 point)
O accuracy of data
O timeliness of information
O purpose of the author
O length of content
D. Length of content.
Reliable sources need to be accurate, they need to make sense at the time they were created and the author needs to not be biased with their writing. It does not matter how long the content is as long as it is reliable.
A wheel of mass 4kg is pulled up a plane inclined at 30° to the horizontal by a force of 45N applied to the axle and parallel to the plane. If the wheel has a radius of 0.5m and the moment of inertia 0.5kgm?, calculate the translational velocity acquired after travelling 12m up the plane, assuming the wheel is initially at rest (6 marks)
Answer:
v = 10 m/s
Explanation:
Let's assume the wheel does not slip as it accelerates.
Energy theory is more straightforward than kinematics in my opinion.
Work done on the wheel
W = Fd = 45(12) = 540 J
Some is converted to potential energy
PE = mgh = 4(9.8)12sin30 = 235.2 J
As there is no friction mentioned, the remainder is kinetic energy
KE = 540 - 235.2 = 304.8 J
KE = ½mv² + ½Iω²
ω = v/R
KE = ½mv² + ½I(v/R)² = ½(m + I/R²)v²
v = √(2KE / (m + I/R²))
v = √(2(304.8) / (4 + 0.5/0.5²)) = √101.6
v = 10.07968...
Convert 33 grams to ounces
(28.34 grams per ounce)
2.63 ounces
O 1.16 ounces
O 5.66 ounces
Convert the following in to SI units without changing its values
a. 4000 g
b. 2.4 km
hi <3
i believe i explained this answer properly in my last answer but it would be 4kg and 2400m as these are the SI units for these values.
hope this helps :)
hi :D
i believe i explained this answer properly in my last answer but it would be 4kg and 2400m as these are the SI units for these values.
hope this helps :)
An artist creates a solid sculpture made from 7.10 kg of tin. She wishes to create an identical sculpture, using the same mold used to make the original, out of solid lead. What is the mass (in kg) of the lead sculpture? (The density of tin is 7.26 ✕ 103 kg/m3, and that of lead is 11.30 ✕ 103 kg/m3.)
Answer:
7.10(11.30/7.26) = 11.05 kg
Explanation:
dividing by the density of tin gives the volume of the sculpture
multiplying that volume by the density of lead gives the lead mass required.
Two identical billiard balls are rolling toward each other at the same speed. What will be true after they collide head–on?
Answer:
They will be moving away from each other at the same speed.
Explanation:
The final speed may be identical to the initial speed if the collision is perfectly elastic. The final speed will be zero if the collision is perfectly in-elastic.
In all likelihood, the final speed will be slightly slower than the initial speed.
a 60g tennis ball travelling at 30m/s hi a wall and bounce back at 20m/s.calculate (a)momentum of the ball before impact (b)momentum of the ball after impact
Explanation:
the formula for momentum is denoted by p=mv where p is momentum, m is mass and v is velocity. thus, the velocity before impact would be 0.060 x 30 = 1.8 kg/ms
the second one would just be 0.060 x 20 0.72kg/ms
I'm not 100 percent sure this is correct but yeah
Bobo, the clown, wants to set the world record for the furthest range traveled by a clown shot out of a cannon. Write a sentence describing the cannon that Bobo would need to use to accomplish this feat. Be sure to include the necessary initial velocity and the required angle of the cannon. Score: 0 / 1
In the human cannonball act makes use of of a special type of "cannon" that more safely ejects a person who acts as the "cannonball"
The world record for the longest flight by a human cannonball is approximately 194 feet and therefore the human cannon catapult that Bobo would need is one that would be able to propel him with an initial velocity of more than 120 kilometer per hour (more than the speed of the current record holder) with the cannon directed at an angle 45 degrees above the horizonal
The reason the values given above are correct is as follows:
The world record of the furthest range of the human cannonball is 193 ft. 8.8 inches. The maximum claim for the furthest range of a human cannonball is 200 ft. 4 in. Therefore, to safely set the world record would be to reach a range of 194 feet
The speed with which the world record was accomplished (120 km/jhr) should be expected to be exceeded given, horizontal speed in free fall motion is constant (decreasing in the presence of drag), and the conditions are likely to be more or less similar
In order to reach the furthest range, R, at the possible speed, the angle of inclination of the "cannon" required is 45°, according to the range formula, which is given as follows;
[tex]Range, \ R = \dfrac{v^2 \times sin(2\cdot \theta)}{g}[/tex]
The maximum range is given where θ = 45, such that sin(2·θ) = sin(90°) = 1
A further range than the world record van be obtained using the above values
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what is kinematics ??? -,- xD
Answer:
Basically, it's motion of a object.
100% smart.
Yup, 100% wrong.......
[tex]AnimeVines[/tex]
Answer:
the branch of mechanics concerned with the motion of objects without reference to the forces which cause the motion.Compare with dynamics.
Explanation:
i looked it up it
A mountain climber at the peak ha ___________ energy.
A.gravitational potential
B. Elastic potential
C.Kinetic
How do we know how much
gravitational force objects have?
Answer:
With a force of 1 Newton, an object weighing 100 grams is dragged towards the planet's center. On Earth, an item with a mass of 100 grams has a gravitational pull of only 1%, or about kg.
Explanation:
i hope this helps
2) A ball is thrown straight up into the air and passes a window 3 seconds after being released. It passes the same
window on its way back down 1.5 seconds later. What was the initial velocity of the ball?
Answer:
Hi, There! your Answer is Below!
10.29 m/s
Explanation:
a = -9.8
v = Vi - 9.8 t
h = 0 + Vi t - 4.9 t^2
-------------------------------
----------------------
at the top, t = .3 + 1.5/2 = 1.05
and v = 0 = Vi - 9.8(1.05)
so
Vi = 9.8(1.05) = 10.29 m/s
(Dont forget to mark thanks) :)
The initial velocity will be = u = 36.75 m/s
What are kinematics equations of motion ?
That describe the motion of point , bodies , and system of bodies without considering the force that cause them to move.
let that window at height h
it took 3 sec to reach that window and after crossing that window it took 1.5 second to come back to that same window
this implies , total time taken to to get to the top = 3sec + 1.5/2 = 3.75 sec
using equation of motion :
v = u + at
v= final velocity =0(at top )
u = initial velocity =?
a = acceleration , a=g ( acceleration due to gravity) = 9.8 m/s^2
t= 3.75 sec
0 = u - 9.8(3.75)
u = 36.75 m/s
initial velocity will be = u = 36.75 m/s
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If an object is moving with a constant velocity then according to Newton's first law:
A- it will continue with this velocity only if a net external unbalanced force acts.
B- it will change its velocity if a net unbalanced external force is applied.
С- it will continue with its velocity as external unbalanced force acts.
D- it will continue with its velocity as friction only acts if an external unbalanced force is applied.
what is the answer to {36m= ? dm}
Answer:
360
Explanation:
just add a 0 when using dm
Which phrase is the best definition of energy
Answer:
The capacity for doing work.
Explanation:
It has the forms kinetic, potential, thermal, electric, nuclear or other forms of energy.
In physics, the ability to do work is referred to as energy. It can be of several types like thermal, electrical, chemical etc.
What is Energy?The capacity to perform work is known as energy in physics. Potential, kinetic, thermal, electrical, chemical, nuclear, and other types are all possible. As energy is transferred from one body to another, there is also heat and work. Energy is always categorized after it has been transferred based on its nature. As a result, heat transfer may result in thermal energy, whereas labor may result in mechanical energy.
Motion is a common feature of all energy types. Whenever a body is in motion, for instance, it contains kinetic energy. Even while at rest, a tensioned object like a spring or bow can move; this is because of the configuration of the object, which carries potential energy.
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Which definition best explains science? (1 point)
Answer: c is the correct answer
Explanation:
Option C is the correct answer.
Definition of Science: A way of discovering and knowing about the world.
Science
Science can be defined as the knowledge and understanding of the natural and social world following a systematic methodology based on evidence.
The scientific methodology includes objective observation, measurement and data evidence.
Science is a system of observations and experiments used to gain knowledge about how the universe works. Observations describe how and why things happen the way they do. Experiments are investigations used to explain how the world works.
Hence option C represents the best definition.
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ANALYZE
How does the distance traveled by the coin compare to its displacement after ten flips?
Answer:
The positive velocity occurs the instant the coin leaves our hand. It immediately begins slowing up until its upward velocity becomes zero at the maximum height. At this instant it begins to fall and its velocity increase in a negative direction. The velocity reaches its maximum negative value the instant before it touches your hand.
HELP ME PLEASE !!
The scatter plot shows the winning time in the men's 200 m dash event in six consecutive Olympics.
What was the approximate winning time in the year 1992?
A) 20.2s
B) 20s
C) 19.8s
D) 10s
Answer:
B 20 sec
Explanation:
if you look at 1992 you can see that it is on 20 sec
The approximate winning time UK the 1992 Olympics as depicted by the scatterplot is 20 seconds.
The scatter plot illustrates the winning time on the y-axis of the graph and the Olympic year on the x - axis. The dots on the graph gives the point of intersection of a given x and y coordinate value. The winning time of the 1992 Olympics is represented by the dot located directly above 1992, the value of the dot on the y - axis gives the winning time.Therefore, the value of the dot on the y - axis is 20 seconds, hence, the winning time of the 1992 Olympics.
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