Answer:
Unbalanced forces
When two forces acting on an object are not equal in size, we say that they are unbalanced forces. The overall force acting on the object is called the resultant force. If the forces are balanced, the resultant force is zero.
If the forces on an object are unbalanced, this is what happens:
a stationary object starts to move in the direction of the resultant force
a moving object changes speed and/or direction in the direction of the resultant force
In the example below, the resultant force is the difference between the two forces:
100 – 60 = 40 N (to the right)
Using moments
A see-saw will balance if the moments on each side of the pivot are equal. This is why you might have to adjust your position on a see-saw if you are a different weight from the person on the other end.
If a nut is difficult to undo with a short spanner, a longer spanner will help. This is because there will be a bigger moment on the nut, when the same force is applied further from the pivot.
Using the same principle you can increase the moment applied by a lever or a crowbar, and this can help you move heavy objects more easily.
Imagine that you design running shoes for a living. Which biometric would be most useful?
A.
the average weight of a runner
B.
the number of runners in a popular urban area
C.
the points of impact when the foot hits the ground
D.
the distance that beginning runners attempt to finish
When designing running shoes, the most useful bio metric is the average weight of a runner.
Usually, running shoes are designed with the particular concerns of the user in mind. A very useful biometric when designing running shoes is the average weight of the runner.
This is important because a heavier runner, for instance, will hit the ground with a greater force leading to greater impact. It is necessary that these runner have shoes that help to cushion this higher impact.
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3. Electric cars are being rapidly developed to replace gasoline powered cars, but the problem is not easy because it is hard to find as good a way as gasoline for storing and transporting energy.
a. How much chemical energy in Joules are in 15 gallons of gasoline?
b. The energy capacity of batteries, such as used in the Tesla cars, are given in kW hrs. Their standard battery is 7.0 kW hrs and the cost is a substantial fraction of the price of the car. What capacity would a battery have to be equal to the energy in 15 gallons of gas?
To convert 15 gallons of gasoline to chemical energy in joule, multiply the figure above by 15 which is 1,800,000,000 Joules. Answer to b part is 60KWhrs
a.) A gallon of gasoline in most countries contain about 120 millions joule of chemical energy.
To convert 15 gallons of gasoline to chemical energy in joule, multiply the figure above by 15. That is,
Chemical energy = 15 x 120000000 = 1,800,000,000 Joules
b.) Also, the amount of energy cost per gallon of gasoline produced in most countries is equivalent to about 4 kilowatt hours. The capacity that would be equal to the energy in 15 gallons of gasoline that a battery should have will be
Capacity = 4 x 15 = 60 KWhrs
Therefore, the capacity a battery will have to be equal to the energy in 15 gallons of gasoline will be 60 KWhrs.
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Compared to permanent magnets, why are electromagnets more useful in
many modern technologies?
O A. In permanent magnets, the strength of the magnetic field is more
consistent.
O B. To use an electromagnet, a power supply is not necessary.
O C. Strong permanent magnets are too large to use.
O D. By controlling the current, electromagnets can be turned on and
off.
We want to see why electromagnets are more useful in modern technologies.
We will see that the correct option is D:
"By controlling the current, electromagnets can be turned on and off."
An electromagnet is, as the name implies, a magnet that works with a power supply.
Why these are more useful than normal magnets?
Because you have more control over them. By controlling the current, you not only can turn it on and off, but you also could regulate the strength of the magnetic field.
This extra control is what makes the electromagnet a better option than a permanent magnet.
So the correct option is D: "By controlling the current, electromagnets can be turned on and off"
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a 15-kg block is on a frictionless ramp that is inclined at 20° above the horizontal. it is connected by a very light string over an ideal pulley at the top edge of the ramp to a hanging 19-kg block, as shown in the figure. the string pulls on the 15-kg block parallel to the surface of the ramp. find the magnitude of the acceleration of the 19-kg block after the system is gently released?
Hi there!
Since the string is light and there is no friction in the pulley, the acceleration of the system is equal to the acceleration of both blocks.
We can begin by summing the forces of each block:
Block on incline:
- Force of gravity (in the negative direction away from the acceleration)
- Force of Tension
∑F = -M₁gsinФ + T
Block hanging:
- Force of gravity (Positive, in direction of acceleration)
- Force of Tension (Negative, opposite from acceleration)
∑F = M₂g - T
Sum both of these net forces for each block:
∑Fт = -M₁gsinФ + T - T + M₂g
∑Fт = -M₁gsinФ + M₂g
Divide by the mass to solve for acceleration:
[tex]a = \frac{-M_1gsin\theta+M_2g}{M_1+M_2}[/tex]
Plug in the given values:
[tex]a = \frac{-(15)(9.81)(sin20)+19(9.81)}{15+19} = 4.002 m/s^2[/tex]
The magnitude of the acceleration of the 19-kg block is 4.0 m/[tex]s^{2}[/tex].
The 15-kg block is accelerating down the ramp, and the 19-kg block is accelerating up. The string connecting the two blocks is taut, so it must be applying a force to both blocks. The force of the string on the 15-kg block is equal to the force of the string on the 19-kg block.
Let's call the force of the string on the 15-kg block T. We can use Newton's second law to write two equations for the acceleration of the two blocks:
For the 15-kg block: T - mg sin(θ) = 15a
For the 19-kg block: T = 19a
where:
m is the mass of the block
g is the acceleration due to gravity
θ is the angle of the ramp
a is the acceleration of the block
Plugging the second equation into the first equation, we get:
19a - mg sin(θ) = 15a
Solving for a, we get:
a = (mg sin(θ)) / (4m)
= (15 kg * 9.8 m/[tex]s^{2}[/tex] * sin(20°)) / (4 * 15 kg)
= 4.0 m/[tex]s^{2}[/tex]
Therefore, the magnitude of the acceleration of the 19-kg block is 4.0 m/[tex]s^{2}[/tex].
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A person is riding a skateboard on a U-shaped ramp. At which point does the person have the greatest potential energy?(1 point)
on the downswing as the person is dropping into the ramp
on the downswing as the person is dropping into the ramp
at the top of the ramp before dropping in
at the top of the ramp before dropping in
in the middle of the ramp at the lowest point
in the middle of the ramp at the lowest point
on the upswing as the person is coming up the other side of the ramp
Answer:
at the top of the ramp before dropping in
Explanation:
Potential energy is basically the build up of energy before it's released.
Find the area enclosed by a rectangle that is 1300 m wide and 1630 m long. Write your answer so that it has the correct number of significant figures.
Answer:
2120000m^2
Explanation:
1300* 1660 and there is 3 significant figures, so the 9 would make the round to a 2.
Find the 10 action words in the word puzzle
help me pls
I hope this helps.
Cheers.^^
(I could not find one of them, but the other nine are found.)
Which event can be excluded from a list of interactions among Earth's spheres?
A solar flares
B volcanic eruption
C fracking for natural gas
D hurricane
what activities areaways to overcome barriers to physical fitness
Answer:
No Time
Schedule activities into your day and use an exercise log so you can see how little time it takes.
Build activities into everyday tasks no matter where you are: Bike to work. Use the stairs. Take walk breaks at work. Garden. ...
Find an activity you enjoy that works for your schedule
Add vectors 7.5 m/s and the vector -2.9 m/s
How To:
How do you add two vectors?
To add or subtract two vectors, add or subtract the corresponding components. Let →u=⟨u1,u2⟩ and →v=⟨v1,v2⟩ be two vectors. The sum of two or more vectors is called the resultant. The resultant of two vectors can be found using either the parallelogram method or the triangle method .
Of the two forms of friction you studied,_____ friction is the one that must be overcome in order to start something moving.
Answer:
static friction will be your answer
An object initially traveling at 20 Meters per second west accelerates uniformly at 4.0 meters per second squared east for 2.0 seconds The displacement of the object during these 2.0 seconds is
The displacement of the object during these 2.0seconds is; 32 meters west
According to the question;
Initial velocity, u = 20m/sAcceleration, a = 4m/s²Time, t = 2sDisplacement, S = ?However, since the acceleration of the object is in the opposite direction; the equation of motion that can be used to find the Displacement is;
S = ut - at²/2By substituting values as given in the question; we have;
S = (20 × 2) - (4 × 2²)/2S = 40 - 8S = 32m west
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Carbon dioxide in the blood is removed from the body through the A. kidneys B. lungs C. mouth D. skin
Answer:
C) MouthExplanation:
When we inhale air, it contains oxygen. The lungs take in oxygen and the heart and the other body parts use it.Carbon dioxide is removed from the blood mouth when we exhale.Which of these is an example of weathering?
A
a landslide moving debris down the side of a mountain
B
a large rock cracking into many smaller pieces around a tree root
C
wind blowing sand from one side of a beach to the other
D
glaciers slowly carrying bits of rock along the ground
Answer: D
Explanation: The weather is making the Bits of rock and the glaciers are moving it so that is weathering.
What makes carbohydrates good at storing energy?
After we eat, our glucose levels rise when carbohydrates are fully broken down. This alarms beta cells (in the pancreas) to release insulin into our bloodstream and altogether insulin allows the glucose to enter our cells and be utilized for energy. Some carbs are used for energy and the rest is stored as fat!
Hope I helped in some way :)
what region of the solar spectrum can cause a dangerous sunburn
:
ultraviolet B
Explanation:
PLS PLS HELP I'LL MARK YOU BRAINLISTTT!!!!
Answer:
i think it might be 5
sry if im wrong
if a penny is dropped from a height of 100m, how fast would it be going just before it hit the ground ?
Hi there!
To find the final velocity of an object dropped from rest, we can used the simplified equation:
vf = √2gh
Plug in the given values: (g = 9.8 m/s²)
vf = √2(9.8)(100) ≈ 44.272 m/s
A 10 kg box of iPhones is pulled across a table by a horizontal force of 80 N with a frictional force of 10 N opposing the motion. Calculate the acceleration of the box
Help pleaase
I'll brainliest the correct answer
Answer:
1) writing homework
2) Helping homeless people
3) Teaching
Explanation:
1)You can finish your homework by your skill.
2)You can help homeless people buy your working skill.
3) You can teach people by your educative skill.
Please give Brainliest
insert two arithmetic means between 13 and 18.5
Answer:
Describe the process of boiling
what is a contact time
Answer:
Contact time—or “wet time”—is how long a disinfectant needs to stay wet on a surface in order to be effective
Explanation:
Contact times can range from as little as 15 seconds for common hand sanitizer, to as long as 30 minutes for chlorine oxides used in laboratories.
A lawyer most likely has __________. a.spatial intelligence b.practical intelligence c.analytical intelligence d.creative intelligence
The type of intelligence required by a profession depends on its job description. Lawyers most likes have analytical intelligence.
A renowned psychologist named Howard Gardner devised a theory of multiple intelligence. This means that nobody is really not intelligent because a person must posses one or more of these multiple intelligence.
A lawyer has a lot to do with analytic reasoning and comparison of evidence to determine their validity. This task requires a strong analytical mind hence a lawyer requires analytical intelligence.
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pls help will give brainliest
Explanation:
the correct answer is Option 5.√½gh.
hope this helps you.
Voyager 1 and Voyager 2. (Note that Plagiarism will result in an automatic Zero. Do not cut and paste. Put things in your own words. please.)
Your job is to research the following two famous satellites and report on the following information about both. Make sure to be specific about what information goes with with one.
1. When were they launched?
2. What were there purposes?
3. Which nation/s were involved in building them?
4. What information have they sent back to earth?
5. What did scientists put on them for extra terrestrial life to find? Make sure to list them and describe what they are and do.
6. Are they still working?
7. Where are they located and where are they going?
8. How fast are they traveling?
9. At least on interesting fact about each.
NEXT - Research at least 5 more satellites and find the following information about them.
1. When were they launched?
2. What were their purposes?
3. Which nation/s were involved in building them?
4. What information have they sent back to earth?
5. How much did they cost to build?
6. Are they still working?
7. Where are they located and where are they going?
8. How fast are they traveling?
9. At least on interesting fact about each.
10. Copy and past a picture of each onto your page.
The voyager program was a space exploration program created to be the first to travel and explore the outer reaches of our solar system and beyond.
The voyager space probes were launched in 1977 and are still functional to this day, making them the longest running space exploration mission. The purpose of the voyager space probes is to relay information back to earth on the various planets and interplanetary objects they fly by.
Through these missions, NASA has received information regarding:
Jupiter's cloud formations and storm systems Volcanic activity on the Jupiter moon of IoInteresting discoveries about the rings of Saturn Voyager 2 discovered a huge magnetic field surrounding Uranus 10 additional moons seen to orbit Uranusand much more, making it already an extremely successful mission.
The voyager spacecrafts were designed and built by the United States of America with government funding and contributions from other renowned space agencies.
As of 2021, voyager 1 is moving with a velocity of 61 thousand km per hour , with voyager 2 moving at roughly 55 thousand km per hour putting them beyond the outer reaches of the inner solar system. This along with the many important finds they are responsible for make them worth the 890 million dollars they cost to build.
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PLS HELP WITH STEPS I'LL MARK U BRAINLISTT
Answer:
The total distance covered by the student is 35 meters because -15+ 0 + 20 = 35.
NEED HELP!!!! 10 POINTS!!!!
Oxygen helps all aspects of the body function better.
A.
True
B.
False
PLEASE NO LINKS
Answer: True
Explanation: Oxygen is important to every cell in your body. Without it, your cells can't make energy, and their metabolism is less effective.
Explanation:
true. your red blood cells need energy to process through your blood and body. your lungs need oxygen to breathe. the oxygen travels through your lungs into your blood to the organs and tissues which all help the body function
A water bottle contains 15.0 ounces of water. A person drinks 0.5 ounces per minute. How many hours will it take to drink all of the water?
Tape a piece of white paper to your wall.Aim the flashlight at the CD so that it makes the rainbow reflect onto your blank paper.
Answer:
where is the question girl
For which type(s) of signals does noise alter the original information?
A) analog only
B) digital only
C) both analog and digital
D) neither analog nor digital