Answer:
Static friction prevents the motion of an object while sliding friction is a type of frictional motion between two surfaces in contact.
Explanation:
PLS HELP!!! The quarter back runs 75 meters down a football field in 12 seconds to score a touchdown. How fast did he run? A. 0.2m/s B. 6 m/s C. 26 m/s D. 87 m/s
Answer:
B.6
Explanation:
speed = distance / time
= 75m / 12s
= 6.25 m/s
The closest answer is b. 6 m/s
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Which statement is true?
Question 15 options:
Gravity is the force of resistance to a change in position. The greater the distance between two objects, the greater this force will be.
Gravity is a force that keeps objects moving in space. The less the object weighs, the further out in space gravity will pull the object.
Gravity is the force of attraction between two objects with mass and is dependent on the distance between these objects.
Gravity is the force that repels two objects that have opposite charges. It is dependent upon the charges of the objects.
Answer:
last one
Explanation:
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Why is a control group important?
A. It changes all the time, allowing us to see if the experimental group stays the same.
B. It is used to see if the experimental group causes a change.
Answer:
A. It changes all the time, allowing us to see if the experimental group stays the same.
control group mean the thing the stay the same during the Experiment.
I hope this help
I hope this is correct
Answer:
The correct answer is:
It is used to see if the experimental group causes a change.
Explanation:
I got this right on my Edpuzzle
Hope this helps : )
A student will study german at last 3 years
Answer:
i don't understand
Explanation:
what if your outgoing,fun,kind,and a bit loud and ppl still don't what to be your friend? What am I doing wrong?
Answer:
Maybe you're hanging out around the wrong crowd. The people you are probably choosing to be around are more quiet then you.
Explanation:
Need help on on number 2
Answer:
3 m/s
For every 1 second it moves 3 positions. Hope that helps!
Explanation:For every 1 second it moves 3 positions. Hope that helps!
tell me if it's right
Please Help!!!! What is the momentum of a 0.01 kg toy car moving at 5.0 m/s? (2 points) 500 kgm/s 50 kgm/s 0.5 kgm/s 0.05 kgm/s
Answer: 0.05 kgm/s
Explanation:
What is the power of an electric toothbrush if it can do 750 joules of work in 75 seconds?
Power = (work done) / (time to do the work)
Power = (750 joules) / (75 seconds)
Power = 10 joules/second
Power = 10 watts
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Answer:
Scientific method
Explanation:
If a car has an initial velocity of 20 m/s and accelerates at 2.0 m/s2 for 100 m, what is its final velocity?
Answer:
28.28 ms-1
Explanation:
v² = u² + 2as
v² = 20² + 2×2×100
v²= 800
v = 28.28 ms-1
A ____________ is a condition or behavior that may threaten an individual's well-being
Answer:
yeah it may be a risk factor
Explanation:
What is good people?
Answer:
a good person is somebody who is not bad who is good nice good humanity
where are the physics in football
Answer:
The branch of physics that is most relevant to football is mechanics, the study of motion and its causes.
Explanation:
When the ball leaves the punter's foot, it is moving with a given velocity (speed plus angle of direction) depending upon the force with which he kicks the ball. The ball moves in two directions, horizontally and vertically. Because the ball was launched at an angle, the velocity is divided into two pieces: a horizontal component and a vertical component.
You are on a rollercoaster going around a curve. Your speed is a constant 40 miles per hour. Are you accelerating?
7.
You run from your house to a friend's house that is 3 miles away in 30 minutes. You then
immediately walk home, taking 1 hour on your return trip.
Your House
Friend's House
West East
v=d/t
--
v=6mi = 7
-3 miles
a. What was the average speed (in mi/hr) for the entire trip? ,07
b. What was the average velocity (in mi/hr) for the entire trip?
Answer:
a. The average speed is 4 mi/hr
b. The average velocity is 0 mi/hr
Explanation:
a. The average speed is given by the following formula;
[tex]Average \ speed = \dfrac{Total \ Distance}{Total \ Time}[/tex]
The given information are;
The time it took for one friend to run to his friend's house = 30 minutes
The distance between the two houses = 3 miles
The time it took for the friend to walk home = 1 hour
Therefore, the distance the friend ran going to his friend's house = 3 miles and the distance the friend walked going back his house = 3 miles
The total distance travelled = 3 + 3 = 6 miles
The total time taken = 1 hour + 30 minutes = 1 hour 30 minutes = 1.5 hours
Therefore;
[tex]The \ average \ speed = \dfrac{Total \ Distance}{Total \ Time} = \dfrac{6 \ miles }{1.5 \ Hours} = 4 \ miles \ per \ hour[/tex]
The average speed for the entire trip = 4 mi/hr
b. The average velocity is the total change in position divided by the total time taken to make the change or total displacement divided by the total time for the displacement
Mathematically, average velocity is given as follows;
[tex]The \ average \ velocity = \dfrac{Final \ location - Initial \ location}{Time \ taken \ for \ the \ change \ in \ location}[/tex]
[tex]The \ average \ velocity = \dfrac{Total \ displacement}{Time \ taken \ for \ the \ change \ in \ location}[/tex]
[tex]The \ average \ velocity = \dfrac{Total \ change \ in \ location}{Time \ taken \ for \ the \ change \ in \ location}[/tex]
Given that the friend changed his location to his friend's house, a distance of 3 miles he we have;
Initial change in location of the friend = 3 miles
After which the friend then relocates back to his house (and we know that it is the same journey but in opposite direction, he we have;
Final change in location of the friend = -3 miles
We are given that he ran to his friend's house and walked back home in a total time of 1 hour + 30 minutes = 1.5 hours, therefore, we have;
[tex]The \ average \ velocity = \dfrac{Sum \ total \ of \ change \ in \ location}{Time \ taken \ for \ the \ change \ in \ location} = \dfrac{3 + (-3) }{1.5}[/tex]
[tex]The \ average \ velocity = \dfrac{3 \ miles + (-3) \ miles }{1.5} = \dfrac{0 \ miles }{1.5} = 0 \ mi/hr[/tex]
The average velocity = 0 mi/hr.
A water-balloon launcher with a mass of 1.75 kg is suspended on a wire. It fires a 1.25 kg balloon to the east at a velocity of 12.0 m/s. What is the resulting velocity of the launcher if the net force on the launcher is equal to the reaction force? O A. 6.1 m/s east B. 16.8 m/s west C. 7.6 m/s west D. 8.6 m/s west
Answer:
8.6 to west
Explanation:
The initial momentum of the system is given by the sum of the momentum of the launcher and the momentum of the balloon. The correct answer is option C. 7.6 m/s west.
To solve this problem, we can apply the principle of conservation of momentum. According to this principle, the total momentum before an event is equal to the total momentum after the event, assuming no external forces act on the system.
The momentum of an object is calculated by multiplying its mass by its velocity.
Initial momentum = (mass of launcher × velocity of launcher) + (mass of balloon × velocity of balloon)
Let's substitute the given values into the equation:
Initial momentum:
[tex](1.75 kg * 0 m/s) + (1.25 kg * 12.0 m/s)[/tex]
Initial momentum = 15 kg·m/s
Since the net force on the launcher is equal to the reaction force, we can assume no external forces act on the system. Therefore, the total momentum before firing the balloon is equal to the total momentum after firing the balloon.
Final momentum = (mass of launcher + mass of balloon) × final velocity of the launcher
Let's solve for the final velocity of the launcher:
Final momentum:
[tex](1.75 kg + 1.25 kg)[/tex] × Final velocity of the launcher
15 kg·m/s = 3 kg × final velocity of the launcher
Dividing both sides of the equation by 3 kg gives us:
The final velocity of the launcher = 15 kg·m/s / 3 kg
The final velocity of the launcher = 5 m/s
Since the initial velocity of the balloon is to the east, the final velocity of the launcher will be to the west. Therefore, the correct answer is option C. 7.6 m/s west.
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Why do you think false sciences are so widespread?
Answer:
The Internet (social media to be precise)
Explanation:
False science are purported scientific conclusions drawn without any scientific data or procedures followed to arrive at such conclusions. These purported conclusions would have been irrelevant or not widespread without the internet or social media but the easy accessibility to social media globally has made "everyone" to be a scientist or even a publisher without scientific steps.
Some innocent individuals also help share (on the internet) these false science because of the inability to differentiate between the real scientific process and the ones done without any/some due scientific processes hence assisting in promoting these false science unknowingly. If there were no internet, these false sciences would not be this widespread as information will not travel this fast.
Physical Science Pre-Test 2020-2021 Question: 1-10 The distance between Earth and the Moon was determined by measuring the time it took for light waves from Earth to travel to the Moon and back. Why was it not possible to use sound waves for this experiment Sound waves must move through a substance Sound waves would change frequency on the return to Earth Sound waves move too slowly for the technique to be accurate Sound waves move more slowly in Earth's atmosphere than in space
Answer:
Option A - Sound waves must move through a substance
Explanation:
Unlike light waves, sound waves must travel through a medium/substance for such a medium to vibrate and then produce sound.
As a matter of fact sound can't travel through empty space.
Thus, looking at the options given, the correct one is:
Sound waves must move through a substance which is Option A
A train travels at a speed of 30mph and travel a distance of 240 miles.How long did it take the train to complete its journey?
Answer:
8hours
Explanation:
240/30 = 8
An egg is dropped from a building that is 61 m high. What is the velocity when it hits the ground and how long did it take?
Answer:
the velocity is 10.6m/s
the time taken is 1.5sec
Explanation:
height (h)=61m
from,
[tex] {v}^{2} = 2gh[/tex]
v^2 = 2 (10)(61)
v^2 = 1220
v^2 = 10.6m/s
for time
[tex]v = \frac{1}{2} g {t}^{2} [/tex]
v=10.6
10.6=1×10t^2/2
10.6=5t^2
10.6/5=5t^2/5
t^2=2.12
t=1.5sec
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what kind of electromagnetic radiation are being collected by the large bincular telescope
Answer:
Orbiting observatories have been launched to observe gamma rays (Compton Gamma Ray Observatory and Fermi Gamma-ray Space Telescope), X-rays (Chandra X-ray Observatory and XMM-Newton), ultraviolet radiation (International Ultraviolet Explorer and Far Ultraviolet Spectroscopic Explore
In freefall, heavier objects fall with a greater acceleration than lighter objects.
Answer:
That is not true all objects fall at the same speed excepts things like feathers or paper.
Answer: false
Explanation: apex
was an American writer, poet, editor, and literary critic. Poe is best known for his poetry and short stories
Answer:
poet
Explanation:
Can a scientific ‘law’ change?
Answer:
Nope
Explanation:
Because take for example Newtons law
find the resultant velocity of the motorboat traveling east at 10.00 m/s, if it encounters a current traveling north at 8.00 m/s.
Answer:12.80
Explanation:
It just is
the unit of pressure is derived unit, why?
Answer:
I hope you understand it.
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Skid Marx set the world record for acceleration as he went from zero to 10 m/s in 3 seconds. How far did he travel in that time?
Answer:
12000 miles per hour
Explanation:
If skid Marx went from zero to 10 miles in 3 seconds the his speed would have been 12000 miles per hour.
Which SI units are combined to describe force
Answer:
the newton (N)
the pascal (Pa)
Explanation:
Combinations of base and derived units may be used to express other derived units. For example, the SI unit of force is the newton (N), the SI unit of pressure is the pascal (Pa)—and the pascal can be defined as one newton per square metre (N/m2).
The __ variable is sometimes called the “manipulative ” because
Answer:
Independent.
Explanation: The Independent variable is sometimes called the "manipulative" because it refers to a quantity that is changed by the experimenter.
Which situation describes the best example of rotational motion?
A. Craig sent the pool ball spinning toward the side pocket.
B. The skater repeated the figure eight on the ice.
C. Sara spun the dreidel on its pointed end.
D. The mouse ran in circles around the mousetrap.
yeah i kinda need help ;w;
The answer is C
! I took the test lol :)
The rotation is a circulatory motion of an object around the axis and maybe for infinite time and pass internally by the body's own center of mass then the body is said to be spinning.
Revolution is used synonym for rotation. Such as planet earth rotates around the sun on its axis. Another example of this motion can be that of dreidel spinning on its pointed edge.Hence option C is correct.
Learn more about the describes the best example of rotational motion.
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