Answer:
trying to push a rock that never moves
Explanation:
let me try my best to break the concepts down for you.
the definition of work done is
work done by a constant force on an object is the product of the force and the distance moved by the object in the direction of the force.
this means that when you apply a force, it must move.
basically it is like holding a book in your hands and not moving, are you fighting the gravitational force?
when you push a box, it definitely moves in the direction you push right?
when you raise the barbel, you are applying a upward force, and barbel us moving upwards, so work is done
hope it helps, if not please report it so that someone else gets to try it
3. A car has an acceleration of +2m/s2. What does this tell you about the velocity of the car? What
is meant by an acceleration of -2m/s2?
Answer:
acceleration is the rate of change of velocity
therefore in the above statement, the velocity increases twice per second.
when acceleration is negative, then it is accelerated motion.
ie. the car accelerates twice per second
ILL GIVE BRAINLIEST !!!!!!!!!!! Do some research, and look up the difference between the zinc-carbon battery described on the
previous page, and the alkaline battery (shown at the left), which is another common dry cell that we
use every day. What are the electrodes made of in the alkaline battery? The electrolyte? Does one type
have an advantage over the other?
Create a few paragraph essay describing your findings to your teacher.
Answer:
The alkaline battery gets its name because it has an alkaline electrolyte of potassium hydroxide instead of the acidic ammonium chloride or zinc chloride electrolyte of the zinc-carbon batteries. An electrolyte is a substance that produces an electrically conducting solution when dissolved in a polar solvent, such as water. The dissolved electrolyte separates into cations and anions, which disperse uniformly through the solvent. Electrically, such a solution is neutral.Advantages. One of the advantages of alkaline batteries over other primary batteries and rechargeable batteries is that it has higher energy density. It has longer shelf life than batteries with chloride-type electrolyte. It could last to up to seven years unused, losing about five percent of its energy every year.
Explanation:
When more energy is released when new bonds are formed. Which bonds are stronger. Please add why
1. The bonds that are formed
2. The bonds that are broken
Answer:
the bonds that are formed
Explanation:
Energy is absorbed in order to break bonds. Energy is released when new bonds are formed. Bond-making is a process of exothermic. Whether the reaction is endothermic or exothermic refers to the difference between the energy needed to break bonds and the energy released when new bonds are formed.
What is the kinetic energy of a 25kg object moving at a velocity of 2.5 m/s
Answer:
78j
Explanation:
78.125J to be exact
How does a balanced Chemical Equation Satisfy the Law of Conservation of Mass?
A. During a chemical reaction, the total amount of matter stays the same.
b. During a chemical reaction, matter is destroyed.
c. During a Chemical reaction, one ore more new substances formed.
d. During a chemical reaction, the total number of atoms increases.
A phonograph record 0.15 m in its radius rotates 18 times per 90 seconds what is the frequency?
Answer:
The frequency of the phonograph record is 0.2 Hz
Explanation:
The frequency of an object moving in uniform circular motion is the number of completed cycles the object makes in a specified time period
The given parameters of the phonograph record are;
The radius of the record = 0.15 m
The number of times the phonograph record rotates, n = 18 times
The time it takes the phonograph record to rotate the 18 times, t = 90 seconds
The frequency of the phonograph record, f = (The number of times the phonograph record rotates) ÷ (The time it takes the phonograph record to rotate the 18 times)
∴ The frequency of the phonograph record, f = n/t = 18/(90 s) = 0.2 Hz
The frequency of the phonograph record = 0.2 Hz.
According to Newton’s second law of motion, what is force equal to?
Answer:
Force is equal to Mass Multiplied by Acceleration
F = M x A
Answer:
Newton's second law of motion is F = ma, or force is equal to mass times acceleration.
How do you determine the height of a wave?
Answer:
Wave height is the vertical distance between the crest (peak) and the trough of a wave. Some other definitions: Still-Water Line is the level of the lake surface if it were perfectly calm and flat. Crest is the highest point on the wave above the still-water line.
Explanation:
ASNWER THIS OR ILL KIDNAPP YOUR DOG AND REVEAL YOUR SEARCH HISTORY!!
Name 3 different forces that act on objects on the Earth
Answer:
Applied Force.
Gravitational Force.
Normal Force.
Frictional Force.
Air Resistance Force.
Tension Force.
Spring Force.
Explanation:
:)
Please help with this?!?!?!?!?!?!
Answer: c because our solar system is called the milky way
Explanation:
What type of reaction feels cold to the touch? A. Endothermic, because energy is being released into the surroundings B. Endothermic, because energy is being absorbed from the surroundings C. Exothermic, because energy is being released into the surroundings D. Exothermic, because energy is being absorbed from the surroundings
Answer:
D. Exothermic, because energy is being absorbed from the surroundings
Explanation:
This is true about the Exothemic reaction due to the fact that, the reaction occurs outside the body. During this reaction, the energy being absorbed from the surrounding environment will hit the body surface thereby creating the coldness due to the heat given out from the body being minimal.
Answer:
Endothermic, because energy is being absorbed from the surroundings.
Explanation:
A vector has an x-component
of 6.15 m and a y-component
of -3.88 m.
Find the magnitude of the
vector.
Answer:
please find attached file
Explanation:
The magnitude of the vector is 7.27m .
What is magnitude of a vector?The magnitude of a vector is the numerical value of the vector. It is represented by the length of the vector.
When a vector is resolved in two components then it is given by formula,
[tex]A = \sqrt{Ax^{2}+Ay^{2} }[/tex]
Here,
[tex]A_{x} = 6.15\\A_{y} = 3.88[/tex]
A = [tex]\sqrt{6.15^{2}+3.88^{2}[/tex]
A = 7.27m
Hence magnitude of the vector is 7.27m .
To know more about vector here
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Urgent! Pls help
A bug and windshield of a fast-moving vehicle collide. Which of the following statements does NOT describe this situation?
A) The change in momentum of the bug and the vehicle is the same.
B) The force felt by the bug and the vehicle is the same.
C) The impulse felt by the bug and the vehicle is the same.
D) The acceleration of the bug and the vehicle is the same.
Answer:
The force felt is the same
Explanation:
dont mind this question
HELPPPPP!
which of the following is a human action that could lead to decreased amounts of greenhouse gases found in the atmosphere, such as carbon dioxide?
A ) Generating energy by burning coal
B ) Deforestation
C ) Driving automobiles
D ) Planting trees
Which has a larger acceleration, a car or a person running?
Answer:
A car
Explanation:
NEED HELP ASAP
thanks + BRAINLIST only for correct answer
Answer:
I. They come from sources across space
II. They travel in a straight line from their source.
III. They can be reflected by some types of material.
Explanation:
Light wave can be defined as an electromagnetic wave that do not require a medium of propagation for it to travel through a vacuum of space where no particles exist.
The following statements about light waves are true;
I. They come from sources across space.
II. They travel in a straight line from their source.
III. They can be reflected by some types of material. reflection occurs when a ray of light or wavefronts bounces off a smooth surface. Thus, when light hit a surface, it bounces back to the medium from which it was originally propagated with.
However, light waves cannot travel through all type of material except materials that are transparent or translucent but not opaque.
5. If an object has an acceleration of 0 m/s2, then one can be sure that the object is not ____.
a. moving
b. changing position
c. changing velocity
6. If car A passes car B, then car A must be ____.
a. accelerating.
b. accelerating at a greater rate than car B.
c. moving faster than car B and accelerating more than car B.
d. moving faster than car B, but not necessarily accelerating.
7. Which one of the following is NOT consistent with a car which is accelerating?
a. A car is moving with an increasing speed.
b. A car is moving with a decreasing speed.
c. A car is moving at a high speed.
d. A car is changing direction.
8. A fullback is running down the football field in a straight line. He starts at the 0-yard line at 0 seconds. At 1 second, he is on the 10-yard line; at 2 seconds, he is on the 20-yard line; at 3 seconds, he is on the 30-yard line; and at 4 seconds, he is on the 40-yard line. This is evidence that
a. he is accelerating
b. he is covering a greater distance in each consecutive second.
c. he is moving with a constant speed (on average).
Answer: c
Explanation: for #5 it can still be moving, just at a constant speed; therefore, it will be c.
If an object has an acceleration of 0 m/s2, then one can be sure that the object is not changing velocity.
If car A passes car B, then car A must be moving faster than car B, but not necessarily accelerating.
The not consistent with a car that is accelerating is a car is moving at a high speed.
A fullback is running down the football field in a straight line. He starts at the 0-yard line at 0 seconds. At 1 second, he is on the 10-yard line; at 2 seconds, he is on the 20-yard line; at 3 seconds, he is on the 30-yard line; and at 4 seconds, he is on the 40-yard line. This is evidence that he is moving with a constant speed (on average).
What is Acceleration?Acceleration is the rate of change of the velocity of an object with respect to time. Accelerations are vector quantities (in that they have magnitude and direction). Speed is the distance covered in a unit of time while acceleration is the rate of change in speed. The unit of speed in the metric system is meters per second (m/s) while that of acceleration is meters per second squared (m/s2). Speed is a scalar quantity while acceleration is a vector quantity.To learn more about acceleration and speed, refer to: https://brainly.com/question/25086037
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When a baseball is thrown straight upward, what is its acceleration at its greatest height? Please explain your answer.
9.8 m/s2 downward
9.8 m/s2 upward
9.8 m/s2 horizontally
0 m/s2
Answer: A
Explanation:
The acceleration of gravity is always 9.8 m/s^2 downwards, even if the velocity is 0 m/s.
A bullet of mass 50 g travelling with a speed of 15ms penetrates into a
bag of sand and is uniformly brought to rest in 0.05s.
Find
(a) How for the bullet will penetrate into the bag of sand?
(b) The Average force exerted by the sand ?
Answer:
a) The bullet will penetrate 0.375 meters into the bag of sand.
b) The average force exerted by the sand is 15 newtons.
Explanation:
The statement is incorrectly written. The correct form is presented below:
A bullet of mass 50 grams travelling with a speed of 15 meters per second penetrates into a bag of sand and is uniformly brought to rest in 0.05 second.
a) How far the bullet will penetrate into the bag of sand?
b) The average force exerted by the sand?
b) The average force exerted by the sand on the bullet ([tex]F[/tex]), measured in newtons, is determined by Principle of Linear Momentum Conservation and Impulse Theorem:
[tex]F = \frac{m\cdot (v_{f}-v_{o})}{\Delta t}[/tex] (1)
Where:
[tex]m[/tex] - Mass of the bullet, measured in kilograms.
[tex]v_{o}[/tex], [tex]v_{f}[/tex] - Initial and final speeds of the bullet, measured in meter per second.
[tex]\Delta t[/tex] - Impact time, measured in seconds.
If we know that [tex]m = 0.05\,kg[/tex], [tex]v_{o} = 15\,\frac{m}{s}[/tex], [tex]v_{f} = 0\,\frac{m}{s}[/tex] and [tex]\Delta t = 0.05\,s[/tex], then the average force exerted by the sand is:
[tex]F = \frac{(0.05\,kg)\cdot \left(0\,\frac{m}{s}-15\,\frac{m}{s} \right)}{0.05\,s}[/tex]
[tex]F = -15\,N[/tex]
The average force exerted by the sand is 15 newtons.
a) The distance travelled by the bullet ([tex]\Delta s[/tex]), measured in meters, is determined by application of Principle of Energy Conservation and Work-Energy Theorem:
[tex]\Delta s = \frac{m\cdot (v_{f}^{2}-v_{o}^{2})}{2\cdot F }[/tex] (2)
If we know that [tex]m = 0.05\,kg[/tex], [tex]v_{o} = 15\,\frac{m}{s}[/tex], [tex]v_{f} = 0\,\frac{m}{s}[/tex] and [tex]F = -15\,N[/tex], then the distance travelled by the bullet is:
[tex]\Delta s = \frac{(0.05\,kg)\cdot \left[\left(0\,\frac{m}{s} \right)^{2}-\left(15\,\frac{m}{s} \right)^{2}\right]}{2\cdot (-15\,N)}[/tex]
[tex]\Delta s = 0.375\,m[/tex]
The bullet will penetrate 0.375 meters into the bag of sand.
Why does refraction occur?
A. Light travels through different materials at different speeds.
B. Different colors of light travel at different speeds.
C. Different materials physically twist light around.
D. Light from different sources travels at different rates.
Answer:
The answer is C.
Explanation:
Let's take a glass of water as an example. Now, shine a flashlight on it. See it bend the light into a rainbow? That is a example of refraction. When the light enters the water, the water actually slows down and changes its direction, causing the light to come out the other side in a different way. Since water is very dense, it can bend the water and make it different.
Variables in physics often include a subscript. What are subscripts used for in physics?
A.) As a numerical coefficient used in multiplication
B.) To accurately juxtapose two congruent terms.
C.) To indicate different versions of the same variable.
D.) To indicate multiplication of the variable.
Answer:
C.) To indicate different versions of the same variable.
Explanation:
Variables in physics often include a subscript. These subscripts are used for indicating different versions of the same variable in physics.
Basically, subscripts are used to represent the beginning (initial) and ending (final) position or point of a variable in physics.
For example, we would look at Gay Lussac' Law of gases.
Gay Lussac law states that when the volume of an ideal gas is kept constant, the pressure of the gas is directly proportional to the absolute temperature of the gas.
Mathematically, Gay Lussac's law is given by;
[tex] PT = K[/tex]
[tex] \frac{P1}{T1} = \frac{P_{2}}{T_{2}}[/tex]
Where;
[tex] T_{1} [/tex] represents the initial temperature.
[tex] T_{2} [/tex] represents the initial temperature.
[tex] P_{1} [/tex] represents the initial pressure.
[tex] P_{2} [/tex] represents the initial pressure.
Note: 1 and 2 are the subscript while T and P are the variables.
Which of the following has the most kinetic energy?
A. stretching a rubber band
B. a jet flying through the air
C. throwing a paper airplane
D. pitching a baseball
Describe how computer climate models help scientists understand possible future climate changes. How reliable are these computer models in making predictions about global warming? Discuss any limitations in these models.
Answer:
To predict future climate, scientists use computer programs called climate models to understand how our planet is becoming different. Climate models work like a laboratory in a computer. They allow scientists to study how the unlike factors interact to influence a region's climate.
Now a new evaluation of global climate models used to project Earth's future global average surface temperatures over the past half-century answers that question: most of the models have been reasonably accurate.
Explanation:
I got a 100% on this assignment copy it and put it on your notes then go sentence by sentence copy but dont highlight any "." you will not be able to paste it into the box add the "." after you paste it, it one sentence.
ONE SENTENCE AT A TIME NO ". ' - or :" AT ALL
If you are in a car that is being pulled down a 56 m path with a force of 12.5
N, what is the work being done?
Answer:
answer is 700 joules
Explanation:
work is equal to force into displacement
W=12.5*56
700 joules
Can someone pls help me. WILL MARK U BRAINLIEST!!!
How do the offspring produced by asexual reproduction differ from those produced by sexual reproduction?
А.
Offspring produced by asexual reproduction are bigger.
В.
Offspring produced by asexual reproduction use more energy.
С.
Offspring produced by asexual reproduction are more uniform.
D
Offspring produced by asexual reproduction are produced more slowly.
Answer:
Asexual reproduction produces offspring that are genetically identical to the parent because the offspring are all clones of the original parent. During sexual reproduction the genetic material of two individuals is combined to produce genetically diverse offspring that differ from their parents.
Explanation:
HELPP!! what is not true about mitosis??
A. The chromosomes in the daughter cells half the number from the parent cell.
B. The chromosomes in the daughter cells are the same number as the parents cell.
C. Each nuclei is identical to the parent nucleus.
D. The four main stages are prophase,metaphase,anaphase, and telophase.
Answer:
I think its A
Explanation:
An aircraft flying at a steady velocity of 70 m/s eastwards at a height of 800 m drops a package of supplies. a) Express the initial velocity of the package as a vector
Answer:
Explanation:
If unit vector towards east is represented by i in the present case ,
initial horizontal velocity of aircraft towards east is 70 m /s . The package dropped by the aircraft will also have same velocity while getting separated from the aircraft . Hence its velocity is represented by the vector ,
v = 70 i .
Its vertical velocity of package at that time will be zero so
v = 70 i + 0 j
= 70 i
Initial Velocity can be defined as the velocity at which the motion starts.
Initial Velocity for the package is [tex]70i[/tex].
Given that an aircraft flying at a steady velocity of 70 m/s eastwards at a height of 800 m.
Here we express the steady velocity as [tex]u\;\rm m/s[/tex]. Distance is expressed by [tex]d\;\rm meter[/tex]. Initial Velocity can be expressed as [tex]v\;\rm m/s[/tex].
Initial velocity can be calculated by the formula given below.
[tex]v\;=\;u\;+\;at[/tex]
In the above formula, [tex]a[/tex] is expressed the acceleration and [tex]t[/tex] is expressed the time of the motion.
For the initial velocity, time [tex]t\;=\;0[/tex] because motion starts in the vertical direction. Let us assume that unit vector can be expressed by [tex]i[/tex] and [tex]j[/tex].
Initial velocity formula in vector form is given below.
[tex]v\;=\;ui\;+\;atj[/tex]
By substituting all the values in the above formula, initial velocity is
[tex]v\;=\;ui\;+\;a\times0j\\v\;=\;ui\\v\;=\;70i[/tex]
So the initial velocity of the package is 70[tex]i[/tex].
For more details about the velocity, follow the link given below.
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What is the force on a 1000 kg elevator that is falling freely at 9.8 m/ sec²?
Answer:
f=m.a 1000*9.8=9800newton