Answer:
Approximately [tex]9.9\; \rm m\cdot s^{-1}[/tex], assuming that this object started from rest, [tex]g = 9.81\; \rm m \cdot s^{-2}[/tex], and that air resistance on this object is negligible.
Explanation:
If the effect of drag on this object is negligible, the acceleration of this object would be constantly equal to [tex]g[/tex], the gravitational field strength ([tex]g \approx 9.81\; \rm m\cdot s^{-2}[/tex] near the surface of the earth.)
Since acceleration is constant, it would be possible to find the final velocity of this object using SUVAT equations.
Let [tex]v[/tex] and [tex]u[/tex] denote the final and initial velocity of this object, respectively. Under the assumption that this object started from rest, [tex]u = 0\; \rm m \cdot s^{-1}[/tex].Let [tex]a[/tex] denote the acceleration of this object. Under the assumptions above, [tex]a = g = 9.81\; \rm m\cdot s^{-2}[/tex].Let [tex]x[/tex] denote the displacement of this object. In this question, [tex]x = 5\; \rm m[/tex].The following SUVAT equation would apply:
[tex]v^{2} - u^{2} = 2\, a\, x[/tex].
Rearrange to find an expression for [tex]v[/tex]:
[tex]\begin{aligned}v^{2} &= 2\, a\, x + u^{2}\end{aligned}[/tex].
[tex]\begin{aligned}v &= \sqrt{2\, a\, x + u^{2}}\end{aligned}[/tex].
Substitute in the values [tex]u = 0\; \rm m\cdot s^{-1}[/tex], [tex]a = 9.81\; \rm m\cdot s^{-2}[/tex], and [tex]x = 5\; \rm m[/tex]. Evaluate the expression to find the value of [tex]v[/tex]:
[tex]\begin{aligned}v &= \sqrt{2\, a\, x + u^{2}} \\ &= \sqrt{2 \times 9.81\; \rm m\cdot s^{-2} \times 5\; \rm m} \\ &\approx 9.9\; \rm m\cdot s^{-1}\end{aligned}[/tex].
Therefore, under these assumptions, the velocity of this object would be approximately [tex]9.9\; \rm m\cdot s^{-1}[/tex] right before it hits the ground.
Which diagram illustrates that matter is always conserved in a chemical reaction?
Answer:
Only the third option has the same number of each size and color circles on either side of the arrow.
Explanation:
I believe it represents the dissolution of two molecules of hydrogen peroxide into two water molecules and an oxygen gas molecule.
The first one balances oxygen but changes sulfur with either carbon or nitrogen
The second one needs 5 oxygen gas pairs instead of a single one on the left to balance the right side. Represents oxidation of a propane molecule if given enough oxygen.
The fourth one has an extra nitrogen on the left side. The hydrogen is balanced. Making amonia.
Why is an un-magnetised iron object attracted to a magnet?
Answer:
Why is an unmagnetized iron object attracted to a magnet?
Magnets attract iron due to the influence of their magnetic field upon the iron. When exposed to the magnetic field, the atoms begin to align their electrons with the flow of the magnetic field, which makes the iron magnetized as well.
Explanation:
An un-magnetized iron object attracted to a magnet because each atom of iron object behaves like a complete magnate having north and south pole of equal strength.
The electron revolving around the nucleus of iron atom are equivalent to small current loop having magnetic dipole.
What is Magnetization?When a magnetic material is positioned close to a magnet, it induces a density of magnetic dipole moments known as magnetization.
The motion of electrons in atoms, or the spin of the electrons or the nuclei, is what produces a material's magnetic properties; the magnetic effect can also be created by running an electrical current through the material.
When an un-magnetized iron object attracted to a magnet; every iron atoms experiences a magnetic attraction force due to magnetic field of the magnet and the atoms try to aliened themselves in such way that they can experience optimum attraction.
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Starting from rest, a ball of mass 2 kg is accelerated at 4 m/s^2 for 3 s. What is the final kinetic energy (in J) of the ball after 3 s?
Answer:
144 joules
Explanation:
v=initial velocity+(acceleration × time)
v=0+(4×3)
v=12m/s
k.e =0.5 × mass × velocity^2
=0.5 × 2 × 12^2
=1 × 144
=144 joules
The depth of a pond is 1.5m. Calculate the pressure caused by the water at the bottom of the pond ??
Answer:
Area=1.5(1.5)=2.25m^2
Force of gravity=10N
\begin{gathered}\\ \sf\longmapsto Pressure=\dfrac{Force}{Area}\end{gathered}
⟼Pressure=
Area
Force
\begin{gathered}\\ \sf\longmapsto Pressure=\dfrac{10}{2.25}\end{gathered}
⟼Pressure=
2.25
10
\begin{gathered}\\ \sf\longmapsto Pressure=4.4Pa\end{gathered}
⟼Pressure=4.4Pa
A cyclist rode the first 30-mile portion of his workout at a constant speed. For the 22-mile cooldown portion of his workout, he reduced his speed by 4 miles per hour. Each portion of the workout took the same time. Find the cyclist's speed during the first portion and find his speed during the cooldown portion.
Answer:
The cyclist rode the first 26-mile portion of his workout at a constant speed.
Time = distance/speed
Time taken to ride through the first portion is
26/x
For the 18-mile cool down portion of his workout, he reduced his speed by 4 miles per hour. It meas that his speed during the cool down portion is (x - 4) mph. Time taken to ride through the cool down portion is
18/(x - 4)
Since each portion of the workout took the same time, it means that
26/x = 18/(x - 4)
Cross multiplying, it becomes
26(x - 4) = 18x
26x - 104 = 18x
26x - 18x = 104
8x = 104
x = 104/8
x = 13 mph
His speed during the cool down portion is
13 - 4 = 9 mph
Explanation:
not simple
I will mark you brainlist please help!
Answer:
C.) The Distance DH = 1.5 lambda
Explanation:
This statement C.) is false, because it does not count as the 1.5 wavelength, it is less than 1 wavelength.
what does that mean?
Answer:
Acceleration is the rate at which the velocity changes .
Hope it's help you !!9. An elevator uses 650.0 watts to lift 5 passengers 30.0 m in 15.0 seconds. What is the force needed to lift the elevator and the passengers?
Hi there!
We can begin by calculating the total WORK done using the equation:
Power · time = Work
650 · 15 = 9750 J
We know that:
Work = Force · displacement (W = Fd), so:
W/d = F
9750/30 = 325 N
Newton's Three laws talk about all of the following:
Inertia, Mass, Force, Acceleration, and Velocity.
Which of these five things is involed/relevent to all three laws? Explain why.
Which are characteristics of a solid? (Select all that apply.)
It maintains its volume.
It can be compressed.
It keeps its shape.
It fills the container it is in.
A solid maintains its volume and shape.
The Supreme Court decision in Brown v. Board of Education, which desegregated schools, is an example of judicial activism.
True
False
4. Mr. S set up an experiment to see how the mass of a
ball affects the distance it rolls off a ramp. Identify the dependent
variable.
a) Distance traveled by the ball
b) Height of the ramp
c) Mass of the ball
Answer:
The correct answer would have to be
C. Mass of the ball
At t=0, a block A of mass 8 kg and block B of mass 16 kg are both at position x=0 . Block A is at rest, and block B is moving at a constant velocity of 10 m/s in the positive x-direction. At t=3 s, the center of mass of the two objects is at the position x=
The center of mass of the two objects is the average position of the parts of the two object system
The center of mass of block A, and block B after displacement of block B is at 20 m from block A
Reason:
The given parameters are;
The position of block A and block B at t = 0 is x = 0
The mass of block A, m₁ = 8 kg
Mass of block B, m₂ = 16 kg
Speed of block A = 0 m/s
Speed of block B, v₂ = 10 m/s
Location of the center of mass of the two object at t = 3 s; Required
Solution;
The location of block A, after 3 s is x₁ = 0 (block A is at rest)
The location of block B, = v₂ × t
The location of block B, after 3 s is x₂ = 10 m/s × 3 s = 30 m
The center of mass of two masses are given as follows;
[tex]x_{cm} = \dfrac{m_1 \cdot x_1 +m_2\cdot x_2}{m_1 + m_2}[/tex]
[tex]x_{cm} = \dfrac{8 \times0 + 16 \times 30}{8 + 16} = 20[/tex]
The center of mass of the two objects is at at the position x = 20 m (from block A)
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A can of soda weighs 4.7 newtons (N) on Earth's surface. What will it weigh on Planet X where the acceleration due to gravity is 1.82 meters per second^2?
Explanation:
The mass of the soda can is
[tex]m = \dfrac{W}{g} = \dfrac{4.7\:\text{N}}{9.8\:\text{m/s}^2} = 0.48\:\text{kg}[/tex]
The weight of this same soda can on Planet X is
[tex]W = mg_p = (0.48\:\text{kg})(1.82\:\text{m/s}^2) = 0.87\:\text{N}[/tex]
An LED bulb transfers 200J of energy in 20s. Its power rating is ...
Answer:
[tex]\huge\boxed{\sf P = 10\ Watts}[/tex]
Explanation:
Given:
Energy = E = 200 J
Time = t = 20 s
Required:
Power = P = ?
Formula:
P = E / t
Solution:
P = 200 J / 20 s
P = 10 Watts
[tex]\rule[225]{225}{2}[/tex]
Hope this helped!
~AH1807In your own understanding what is psychology?
Answer:
psychology is the science of mind and behavior.psychology is the scientific discipline that studies mental states and processes and behaviour in humans and other animals.Answer:
The study of mind and behavior is known as psychology. Psychology is the scientific study of both conscious and unconscious events, as well as feelings and thoughts. It's a vast academic field that straddles the scientific and social sciences.
Gravitational force depends on the mass of an object.
Place the items in order from MOST gravitational force (1) to LEAST gravitational force (5)
Atom
Capitol Building
Earth
Sun
human
1.
2.
3.
4.
5.
Answer:
sun, earth, capitol building, human, atom
Explanation:
Gravity is directly proportional to the size of an object. Therefore, the object with the most mass will have the greatest force of gravity. We know this from the equation. [tex]F = G\frac{m_1m_2}{r^2}[/tex]
salt is made up of what elements?
A.sodium and chloride
B.sodium and chlorine
C.sodium and copper
D.sodium and oxide
Answer:
The first option sodium and chloride
please give brainliest
Salt is made up of what elements?
= Sodium Chloride....
TDS and ppm are common units used to measure
a) the amount of some item in the water.
b) the temperature of water.
c) the direction of water currents.
d) the flow speed of a river
Answer:
c
Explanation:
pls give brainliest have a great day
TDS and ppm are common units used to measure the quantity of substance in the water, therefore the correct answer is option A.
What is a unit of measurement?A unit of measurement is a specified magnitude of a quantity that is established and used as a standard for measuring other quantities of the same kind. It is determined by convention or regulation.
Common units used to measure the amount of material in water are TDS and part per million.
As given in the problem we have to find out for what measurement, the units TDS (Total dissolved solid )and ppm (parts per million) are used.
The total dissolved solid and parts per million are used to measure the amount of substance present in the water, therefore the correct answer is option A.
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The radius of a sphere is 2.00 m. What’s the surface area
S.A of sphere = 4πr²
r = 2m
S.A = 4π *4
S.A = 50.26m²
The surface area is 50.26m²
What is surface area?The surface area exists as the amount of space surrounding the outside of a three-dimensional shape.
The surface area of a solid object exists as a measure of the total area that the surface of the object settles.
The surface area of a figure (in square units) exists the number of unit squares it brings to cover the entire surface without gaps or overlaps. If a three-dimensional figure includes flat sides, the sides are named faces. The surface area exists as the total of the areas of the faces.
A radius of a circle or sphere exists in any of the line segments from its center to its perimeter, and in additional modern usage, it exists also its length.
S.A of sphere = 4πr²
r = 2m
S.A = [tex]4\pi *4[/tex]
S.A = 50.26m²
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HELP ME PLZZZ
You attach a cart with a mass of
0.92 kg to a spring and compress the cart-
spring system. The spring constant for the spring is 130 N/m. Your objective is
to propel the cart with a velocity of 1.4 m/s along a frictionless surface. How
need to compress the spring in order to meet your target velocity?
far do
you
A person weighing 600 N is standing in an elevator. If the upward force of the elevator on the person is 800 N, which of the following is true?
Answer:
person is accelerating downwards
Explanation:
We are told that the force of the person standing on the elevator is 800 N acting downwards.
We are also told that the upward force of the elevator on the person is 600 Newtons.
This means that Upward force is lesser than downward force and thus the person is accelerating downwards
How many total atoms are in the following: 3NHe4
A.15
B.3
C.7
D.12
C) speed.
11. Which of the following is a scientific statement?
A) candy Bon Bons contain no sugar
B) there are things we will never know about
matter is filled with undetectable particles
D) there are parts of the universe that will never be disco
E) none of the above
Explanation:
Cccccc for sure(⌐■-■)Iam a genius
The scientific statement here is option B , there are things we will never know about matter is filled with undetectable particles. This statement is describing the nature of a matter in a scientific way.
What is a scientific statement ?A scientific statement is a description about any phenomenon or properties of any substance in a scientific way. That may include theoretical predictions, universally accepted things, observations etc.
Most of the scientific statements are stated based on the results of well designed scientific investigations and are communicated through various scientific journals and articles.
Here, the statement that describes the nature of matter and its composition is an example of scientific statement. All of the other statements are not scientific.
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Which of the following processes is an important part of star formation? A. nuclear fusion B. nuclear fission C. molecular fusion D. molecular fission
Answer:
B
Explanation:
Answer:
Option A is correct.
Explanation:
At the temperature [tex]10^{7}K[/tex] the hydrogen atoms fuse to form helium thus a large amount of heat is produced and stars are formed.
What causes a star to form?Due to gravitational pull the particles and the molecules of gases become condense and by which it becomes hot. The process goes unless the temperature of the core becomes 10,000,000K.
At this temperature, the fusion takes place and energy is released.
Thus the star shines.
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A wax is applied to the bottom surface of cross country skis to achieve a good balance between traction when
the skier needs to climb a small hill and speed on downhill slopes. The coefficients of both static and kinetic
friction between the waxed surface and snow increase as temperature decreases. If the temperature rises
during the day and the skier begins to slip backward on hills they should re-wax their skis with what type of
wax? (1 point)
A. One where the coefficient of kinetic friction is smaller
B. One where the coefficient of static friction is larger.
C. One where the coefficient of kinetic friction is larger
D. One where the coefficient of static friction is smaller
The defined friction force allows you to find which is the correct result for what type of wax you should use:
B. One where the coefficient of static friction is larger.
The friction force is a macroscopic force that opposes the relative movement of bodies, it is the sum of many interactions at the microscope level.
In general for solid bodies the expression of the out of friction is
[tex]fr = \mu N[/tex]
Where fr is the friction force, μ the friction coefficient and N the normal.
The friction coefficient can be of two types:
Static for when the relative velocity between the two bodies is zero. Dynamic when the relative velocity between the two bodies is different from zero.
In general, the dynamic coefficient is less than the static one.
In this case, as the temperature increases, the friction coefficient decreases, so the skier begins to slide downwards. To prevent this sliding, he must use a wax with a higher friction coefficient.
If you only want to stand on the hill, a wax with a static coefficient must be used, while standing if you want to advance on the hill you must use a wax with a dynamic coefficient since there is a relative movement between the skier and the hill.
Let's examine the different alternatives:
A. False. The friction coefficient must be higher, so that there is more friction force.
B. True. The friction increases and can be stopped on the hill and move up the hill.
C. False In this case, you can go up the hill, but if you stop, you can go back.
D. False. The coefficient must be higher, to increase friction.
Consequently we see that the only type of wax that will allow you to stand or advance on the hill is
B. A wax with a higher statutory coefficient.
In conclusion, using the defined friction force we can find the correct result for what type of wax to use is:
B. One where the coefficient of static friction is larger.
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Answer:
One where the coefficient of static friction is larger
Explanation:
A sports car of mass 1000 kg can accelerate from rest to 27 m/s in 7.0 seconds. What is the average forward force on the car?
Group of answer choices
a.2.6 x 10^2 N
b.3.9 x 10^3 N
c.2.7 x 10^4 N
d.1.9 x 10^5 N
Answer:
Explanation:
F = ma = mΔv/Δt = 1000(27 - 0)/(7.0 - 0) = 3,857.1428...
b. F = 3.9 x 10³ N
A runner runs the first 400 m of a race in 75 s, the second 400 m in 70 s and the final 800 m in 160 s.
Problem 2, Question 1: What is the total distance traveled?
Problem 2, Question 2: What was her average speed for this run?
helpp this is for today
Answer:Distance. Time. If a car travels 400m in. 20 seconds how fast is it going? Speed = Calculate the speed: If you move 50 meters at a speed of 10 2 miles in 15 minutes.
I she is running 8 miles every 60 minutes (which is 1 hour), so she is running 8 miles per hour.
we can see that her pace is 7.5 minutes per mile.
hope this helps
balls and rods set up to represent a solar system
a set of organs and structures that provide digestion in the human body
the defense plan of a football team drawn on a whiteboard
Which option correctly identifies each description?
I. system
II. model
III. systemI. system, , II. model, , III. system , ,
I. model
II. model
III. systemI. model, , II. model, , III. system , ,
I. model
II. system
III. model
, I. model, , II. system, , III. model
I. system
II. system
III. model
A ball is dropped from a tower that is 206 m high, How long does it take to reach the ground?
It will take 6.42 s for the ball that is dropped from a height of 206 m to reach the ground.
From the question given above, the following data were obtained:
Height (H) = 206 m
Time (t) =?NOTE: Acceleration due to gravity (g) = 10 m/s²
The time taken for the ball to get to the ground can be obtained as follow:
H = ½gt²
206 = ½ × 10 × t²
206 = 5 × t²
Divide both side by 5
[tex]t^{2} = \frac{206}{5}\\\\ t^{2} = 41.2[/tex]
Take the square root of both side
[tex]t = \sqrt{41.2}[/tex]
t = 6.42 sTherefore, it will take 6.42 s for the ball to get to the ground.
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