Answer:
The earliest goalie masks used were made from Fiberglass.
Explanation:
Hope that helps
Have a good day
Most personal computers have a firewall and virus protection. Why are these
security programs needed?
A. They keep people from storing personal information on the
computer.
B. They keep harmful programs from entering the computer from the
Internet.
C. They keep analog signals from entering the computer from the
Internet.
D. They make sure digital information is sent out as a digital signal.
Answer:
B. They keep harmful programs from entering the computer from the
Internet.
Explanation:
Did the test !
A spring has a constant of 875 N/m. What hanging mass will cause this spring to stretch 4.5 m?
Answer:
8) A hanging 7.5 kg object stretches a spring 1.1 m. What is the spring constant? 1 . 1 66. 82 NIMO 9) A spring has a constant of 875 N/m. What hanging mass will cause this spring to stretch 4.5 m? Iouliply then divide 875 X 4. 2- - (4 04. 7919) 10) A spring with a spring constant of 25 N/m is stretched 65 cm. What was the force used? 11) A 25 N force stretches a spring 280 cm. What was the spring constant? 12) A 75 N force stretches a spring 175 cm. What was the proportionality constant? 8) 66.82 N/m 9) 401.79 kg 10) 16.25 N 11) 8.93 N/m 12) 42.86 N/m
Explanation:
A spring has a constant of 875 N/m. and the mass which will cause this spring to stretch 4.5 meters is 401.78 kg.
What is Spring constant?The spring constant is a characteristic of a spring which is defined as the ratio of the force affecting the spring to the displacement which is caused by that force. The SI unit of spring constant is N.m⁻¹ (Newton per meter).
The spring constant is:
F = -k/ x
where, k is the spring constant
F denotes the force,
and x denotes the change in the length of the spring.
k = 875N/m
x = 4.5m
We know that
Kx = mg
m= kx/ g
m = 875 × 4.5/ 9.8
m = 401.78kg
Therefore, the mass which will cause this spring to stretch 4.5 meters is 401.78 kg.
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a girl is riding her bike and coasting down a hill. When she gets to the bottom of the hill, her bike continues to move without her pedaling. What type of energy is her bike using ?
a. potential
b. kinetic
c. solar
d. thermal
y’all, i have so many more questions
Answer:
Her bike is using kinetic energy
B
Explanation:
How could I tell if an egg is hard boiled or raw explain using Newton's law of motion
Answer:
Explanation:
Newton's 2 nd law of motion tells that when equal torque is applied on object having higher moment of inertia , it will rotate slower .
Moment of inertia of boiled egg is higher because the whole egg rotates as s solid unit . Hence it will rotate slower or it rolls slower on an inclined surface .
In this way by applying Newton's law , we can identify raw or boiled egg .
what happens to your breathing rate when you.a) exercise.b) go to sleep
Answer:
When you are exercising, both your breating and heart rate go up, and it’s the opposite for sleep, when you sleep, your body slows down to rest itself.
Answer:
Explavyvyvuvubuvuvuvctcycuvrzedtcyvvy
Haha you did that to me it’s only fair
Two charged objects originally felt 12N of attraction. One charge
is changed from 3C to 6C and their distance changes from 15cm
apart to 45cm apart. What is the new force of attraction?
Answer:
The new force of attraction will be [tex]F_{new}=2.67\: N[/tex]
Explanation:
The electrostatic force equation is given by:
[tex]F=k\frac{q_{1}q_{2}}{r^{2}}[/tex]
Where:
q(1) is the first charge, let's use this one to the 3 Cq(2) is the second charger is the initial distance (r = 0.15 m)Then, the original force could express as:
[tex]F_{original}=k\frac{3q_{2}}{0.15^{2}}=12[/tex]
This force is 12 N.
Now, we know that q(1) changes its value to 6 C and the new distance between the charges is 0.45 m, which means:
[tex]F_{new}=k\frac{6q_{2}}{0.45^{2}}[/tex]
We can rewrite this force in terms of the original force.
[tex]F_{new}=k\frac{2\cdot 3q_{2}}{(3\cdot 0.15)^{2}}[/tex]
[tex]F_{new}=\frac{2}{9}k\frac{3q_{2}}{0.15^{2}}[/tex]
[tex]F_{new}=\frac{2}{9}F_{original}[/tex]
[tex]F_{new}=\frac{2}{9}12[/tex]
Therefore, the new force of attraction will be [tex]F_{new}=2.67\: N[/tex]
I hope it helps you!
If a 2 kg spring is compressed by exerting a force of 10 newtons a distance of 50 cm how much work is done?
An electrical generator creates electricity by
A) By spinning a turbine with kinetic energy
B) By using Gasoline
C) By exposing a coil of wire to a changing magnetic field
D) By Aligning the magnetic domains of the coil of wire
Answer:
C) By exposing a coil of wire to a changing magnetic field
Explanation:
An electrical generator creates electricity by exposing a coil of wire to changing magnetic field.
The generator converts mechanical energy which the energy due to the motion of a body and this produces electrical currents.
In the presence of a magnetic field electric current is induced within the circuit. The mechanical energy is obtained from an external source and sustained by the turning of the pistons with the set up. This keeps the generator in constant motion and through the magnetic fields.What are some of the similar features of position vs time and velocity vs time
Explain the Difference between genetic diversity and ecosystem diversity?
Answer:
1. Genetic diversity are the differences in DNA among individuals within a species or population while ecosystem diversity is the number or variety of ecosystems within a particular area.
2. Genetic diversity is the genetic material of microorganisms, plants and animals contains information that determines the characteristics of all species and individuals that make up the diversity of the living world while the ecosystem diversity is the enormous range of terrestrial and aquatic environments on earth has been classified into a number of ecosystems.
Martha, a first-grade teacher, is worried that if doesn't stay In at work to grade papers her principal will think she is lazy She is also worried that if she stays late at work her partner will be angry. This of conflict is known as
Answer:
Character vs self
Explanation:
The reason is because Martha is thinking to much about the negative things and it is making her feel like she is fighting her own body for control.
what were the difficulties
Calculate the weight in Newtons of a person who has a mass of 69 kg.
Can anyone please help meee!!!
Answer:
The centripetal acceleration is given by
a = v 2 r = 10 2 25 = 4 m s − 2
Using Newton's Second Law, the centripetal force acting is
F = m a = 900 ⋅ 4 =3600 N
Explanation:
Pls place the words in the right place I'll give brainless and the points!
Explanation:
you measure temperature in degrees celsius using a thermometer. Thermal energy is measured in joules. A larger volume of water will take longer to heat up but will store more energy than the smaller object. However, a smaller object will lose it's heat faster than a larger object. A cup of tea has less thermal energy than a swimming pool.
Which changes with location?
1weight and gravity
2gravity
3weight
4mass
Answer:
fxfvhzsegjyfetvhtde ftgfrdedddfvygy
Explanation:
mass
a girl pushes her little brother down a snowy hill on a sled and he rides quickly to the bottom of the hill
which one of Newton's Laws is this
Answer:
Newton's First Law of Motion.
Explanation:
Inertia can be defined as the tendency of an object or a body to continue in its state of motion or remain at rest unless acted upon by an external force.
In physics, Sir Isaac Newton's First Law of Motion is known as law of inertia and it states that, an object or a physical body in motion will continue in its state of motion at continuous velocity (the same speed and direction) or, if at rest, will remain at rest unless acted upon by an external force.
In this scenario, a girl pushes her little brother down a snowy hill on a sled and he rides quickly to the bottom of the hill. The push from the little boy's sister is the external force acting on him and consequently, causing him to be in motion down the snowy hill.
a train is sitting still at the top of 990-m mountain. it then coasts down the mountain and back up another mountain that is 520 m high. what is the train's speed at the top of the second hill?
Answer:
Explanation:
At the top of 520 m high mountain , the train will lose potential energy due to loss of height from 990 m to 520 m and gain kinetic energy .
Loss of height = 990 - 520 = 470 m
Loss of potential energy = m x g x 470 where m is mass of the train .
Gain of kinetic energy = 1/2 m v² where v is velocity of train at the top of 550 m high mountain .
1/2 m v² = m x g x 470
v² = 2 x 9.8 x 470
v = 95.98 m /s
Which has the greater volume?
A. wood
B. white block
C. equal
Answer:
B.white block
hope it's the answer ....❤❤❤❤❤❤
most of the energy we use on earth comes from the sun—how does that energy(light and thermal)end up?
As ____energy in our food
As ____energy of wind or moving water
As ____energy that was our lights
As ____energy when we move around
help ;-;
Replace the pencil with an iron nail (Doc.19 in pic)
1. does the lamp glow?
2. does an electric current flow through the lamp?
3. Does the iron nail conduct the electric current?
Answer:
all qn 1,2,3 have same answer ,. Yes,. hope it helps
What type of wave is created here?
A) longitudinal
B) transverse
Help me plssss!!!
Answer:
b
Explanation:
Answer:
this is a longitudinal wave!!!
Explanation:
because you can see the compressions and rarefactions.
Plants are eaten by grasshoppers, which are eaten by mice, which are eaten by snakes.
Answer:
food chain / web lol? was this a question?
Which force is an attractive force that is affected by the masses of objects?
A) tension force
B) magnetic force
C) normal force
D) gravitational force
Class: Physical Science B
Answer:
D) gravitational force
Tiny cell structure that carry out specific functions within the cell
Answer:
Organelles
Explanation:
I learned this in science.
Stan walks 10km west to the grocery store. He shops then walks back 10 km east back to his house. What distance did he cover? What was his displacement?
a girl stands 1.5 m in front of a plane mirror, what is the distance of her image,and what are four image characteristics
Answer:
the distance to the image is 1.5 m
Explanation:
To find the position of the image let's use the equation of the constructor
[tex]\frac{1}{f} = \frac{1}{p} + \frac{1}{q}[/tex]
where p and q are the distance to the object and the image, respectively, and f is the focal length.
In this case a plane mirror has a focal length at infinity, if we substitute in the equation
1 / p = - 1 / q
q = -p
therefore the distance to the image is 1.5 m
this image has some characteristics:
* It is a virtual image, this means that light rays do not pass through it
* It is a right image, that is, the image is in the same direction of the object.
* the magnification is 1, since the height of the image and the object are the same
* has the right - left direction reversed
Which factor is a component of skill-related fitness?
Answer:
There are six skill-related fitness components: agility, balance, coordination, speed, power, and reaction time. Skilled athletes typically excel in all six areas. Agility is the ability to rapidly and accurately change the direction of the body.
Explanation:
While using heated car seats and running the fan on the car’s heater. What type of energy transfer does she use while staying warm in her car?
Answer:
She uses heat energy.
Explanation:
She uses heat energy. She transfers mechanical energy to heat energy wile staying in the car.
A layer of water Δx m thick which lies x m above the bottom of the tank will be rectangular with length 8 m. Using similar triangles, we can see that it will have widt of_____m
Answer:
x
Explanation:
The question relates to the energy required to pump water out of the
spout at the top of the triangular prism tank.
The width of the layer of water Δx thick is x m.
Reasons:
The location of the layer Δx m thick = x meters above the bottom
The length of the triangular (cross-section) prism tank = 8 meters
The length of the layer Δx thick layer = 8 meters
From the attached drawing of the cross-section of the tank, we have;
The height of the triangular tank cross-section = 3 meters
The length of the base of the triangular cross-section = 3 meters
By similar triangles, we have;
[tex]\dfrac{Height \ of \ Tank}{Base \ length \ of \ tank}= \dfrac{Height \ of \ layer \ with \ thickness \ \Delta x }{Width \ of \ layer \ with \ thickness \ \Delta x}[/tex]
Which gives;
[tex]\dfrac{3}{3} =\dfrac{x}{Required \ width}[/tex]
[tex]\dfrac{3}{3} =1 = \dfrac{x}{Required \ width}[/tex]
Required width × 1 = x
The required width = x m
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