The rubbing of certain materials against one another can transfer negative charges, or electrons. For example, if you rub your shoe on the carpet, your body collects extra electrons.
2. Can you rearrange the equation F = kx to get k on one side of the equation
(on its own!). Now, can you rearrange it to get x on its own?
k = f/x
x = f/k
( / means divide )
The equation connecting force and the displacement k is F= k x. From the spring constant k can be found by dividing F by x and similar to get x by dividing F by k.
What is force?Force is an external agent acting on a body to change it from the state of motion or rest. There are various kinds of force namely magnetic force, frictional force, gravitational force etc.
Force applied on a body if result in displacement of the body it is said to work done on the body. An elastic body like a spring can be stretched or compressed by applying a force on it. Let the change in length or displacement of the elastic body be x.
Then, the force applied on it to make the displacement x is directly proportional to x.
F = k x, where k is the proportionality constant here called the spring constant.
From this the spring constant k = F/x
Similarly, if we know the force f and spring constant k, then x = F/k.
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At a given temperature, 3.00 m of carbon dioxide has a mass of 5.94 kg. What is the density of carbon dioxide at this temperature
Answer:
1.98 kg/m
Explanation:
5.94 divided by 3.00
defend the use of renewable or non renewable resources. help please will give brainliest
Answer:
Renewable sources are better because they don't damage the environment. As of now, there is a r=lot of damage already done to the environment thanks to non-renewable resources, and soon a lot of this damage will be irreversible. Another good thing about renewable resources is that that it is unlimited, this means that it is a steady source of energy and items.
Non renewable resources are good for the economy. People are so used to using non renewable resources that they might not want to switch over to renewable resources. People will keep buying these product so it is a steady item to invest in and profit off of. Non renewable resources also have a lot more research on them and people have found multiple different ways to utilize it so people might like it more.
what do you understand by mechanical advantage of a simple machine is 4 ?
Answer:
hope it helps you:)
Explanation:
mark me brainliest
the first element on the periodic table of elements is helium true of false
Answer:
false
Explanation:
it's hydrogen. also hydrogen has one proton and stuff and helium two
11
The frequency of the monochromatic light produced by a laser is 4.7 x 10-14 Hz.
A ray of light from the laser passes from a vacuum, where the speed of light is 3.0 x 108 m/
S,
into a fibre-optic cable.
(a) State
(i) what is meant by monochromatic
*
(2 Points)
(ii) the frequency (1)
Enter your answer
1. Two boys A and B are asked to take 4 chairs from the ground floor to a room at the second floor. A takes 30 minutes to do this work while B takes 60 minutes for the same. (a) Name the physical quantity that is same for both boys. (b) Name the physical quantity that is different and find its ratio for the two boys.
Answer:
(a). Work done is the physical quantity which is same for both boys.
(b).Power is the physical quantity which is different for both boys.
The ratio of power of both boys is 2:1
Explanation:
Given that,
Time of boy A= 30 min
Time of boy B = 60 min
(a), We need to find the physical quantity that is same for both boys
Using given that,
We know that,
Work done depends on the force and displacement.
Here, force and displacement is same for both boys.
So, we can say that the work done will be same for both boys.
(b). We need to find the physical quantity that is different for both boys
Using given that,
We know that,
Power is equal to the work done divided by time.
Time is different for both boys so, the power will be different for both boys.
We need to calculate the ratio of power of both boys
Using formula of power
[tex]P=\dfrac{W}{t}[/tex]
Put the value into the formula
For boy A,
[tex]P_{A}=\dfrac{W_{A}}{t_{A}}[/tex]....(I)
For boy B,
[tex]P_{B}=\dfrac{W_{B}}{t_{B}}[/tex]....(II)
From equation (I) and (II)
[tex]\dfrac{P_{A}}{P_{B}}=\dfrac{\dfrac{W}{30}}{\dfrac{W}{60}}[/tex]
[tex]\dfrac{P_{A}}{P_{B}}=\dfrac{60}{30}[/tex]
[tex]\dfrac{P_{A}}{P_{B}}=\dfrac{2}{1}[/tex]
Hence, (a). Work done is the physical quantity which is same for both boys.
(b).Power is the physical quantity which is different for both boys.
The ratio of power of both boys is 2:1
A tissue cross-section viewed on a microscope slide shows a cell of almost rectangular shape with dimensions 6.9 × 10-4 cm by 1.1 × 10-3 cm. Calculate the cross-sectional area of the cell. Express the area in powers of ten notation and use the appropriate number of significant digits for the number multiplying the power of 10.
Answer:
The cross-sectional area is [tex]A = 7.59 *10^{-11} \ m^2[/tex]
Explanation:
From the question we are told that
The dimension of the cell is 6.9 × 10-4 cm by 1.1 × 10-3 cm = [tex]6.9*10^{-6} \ m \ by\ 1.1*10^{-5} \ m[/tex]
Generally the cross-sectional area is mathematically represented as
[tex]A = 6.9*10^{-6} * 1.1*10^{-5}[/tex]
=> [tex]A = 7.59 *10^{-11} \ m^2[/tex]
A body is moving with a uniform acceleration of 2 m/s2. What does it mean?
Answer:
it means the velocity is changing.
the rate of change of velocity is acceleration
so it means the body is accelerated at 2m/s^2
It means that the body is moving, and getting faster and faster. At any time, it's moving 2 m/s faster than it was moving 1 second earlier.
what is force and energy
Answer:
(below)Explanation:
A force is any action that tends to alter the state of rest or uniform motion motion of a body. This is essentially Newton's first Law of motion. Energy is a property of a system that is a measure of the capacity to do work. for example Potential, kinetic
Hope this helps!
What is a major division between gravity and the electromagnetic force on one hand and the nuclear forces on the other?
1.Gravity and the electromagnetic force have infinite ranges while the nuclear forces have very small ranges.
2.Gravity and the electromagnetic force act on small objects while the nuclear forces act on large objects.
3.Gravity and the electromagnetic force act on large objects while the nuclear forces act on small objects
4.Gravity and the electromagnetic force have very small ranges while the nuclear forces have infinite ranges
Answer:
1) Gravity and the electromagnetic force have infinite ranges while the nuclear forces have very small ranges.
Explanation:
Gravity and the electromagnetic force have infinite ranges while the nuclear forces have very small ranges.
What is gravitational slingshot?In orbital mechanics and aerospace engineering, a gravitational slingshot is the use of the motion of a planet to alter the path and speed of an interplanetary spacecraft.
Given is to find the major division between -
Gravity and the electromagnetic force Gravity and nuclear forcesGravity and the electromagnetic force have infinite ranges while the nuclear forces have very small ranges.
Therefore, we can conclude that -
Gravity and the electromagnetic force have infinite ranges while the nuclear forces have very small ranges.
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Why does fitness matter?
Answer:
The great thing about exercise is that it’s never too soon or too late to start. Fitness can support healthy growth and development in children and reduce the risk of cognitive decline and delay the onset of dementia in older people. You don’t have to join a gym or spend lots of money on equipment to get fit.
Explanation:
A certain space heater that is connected across 220 V and dissipates 1477 W of power in the form of electromagnetic radiation. What is the resistance of the heater?
Hi there!
We can use the power equation:
[tex]P = \frac{V^2}{R}[/tex]
P = Power (W)
V = Potential Difference (V)
R = Resistance (Ω)
Rearrange to solve for Resistance:
[tex]R = \frac{V^2}{P} = \frac{220^2}{1477} = \boxed{32.769 \Omega}[/tex]
Suppose you push on a heavy crate, but not hard enough to make it slide. Does a friction force act on the crate?
a.No, the friction force doesn't act.
b.Yes, opposite to your push, just enough so that F = 0.
The net force is 0 because the friction force counteracts or counterbalances the force you apply, which is why the object does not move. Specifically the static friction is holding the object in place and keeping the object static.
Once you apply enough force and overcome that static friction, then the object will move and you'll be dealing with dynamic friction. Dynamic friction is what still holds the object back somewhat and allows the object to slow down and eventually stop (when the force you apply isn't enough anymore).
Without dynamic friction, the object would slide forever until it hit the wall. With something like slippery ice, there is dynamic friction but it's not as large compared to other surfaces.
refrigertor doors use the ________ property of magnets
Answer:
Attraction property of magnets!
Explanation:
Good luck on your test or question :)
Find magnitude of vector sum
Answer:
An airplane is flying at an airspeed of 200 miles per hour headed on a SE bearing of 140°. A north wind (from north to south) is blowing at 16.2 miles per hour, as shown in Figure 8.8.1. What are the ground speed and actual bearing of the plane?
Explanation:
plss brainlieist me
θ = 205° - 105° = 100°
[tex]\tt R=\sqrt{L^2+M^2+2LMcos\theta}\\\\R=\sqrt{303^2+555^2+2.303.555cos100}\\\\R=584.32~m[/tex]
How is the initial kinetic energy related to the final kinetic energy in an elastic collision?
the initial kinetic energy is equal to the final kinetic energy
A football has a mass of .43 kg and it accelerates at 20 m/s². What is its force?
Answer:
8.6N
Explanation:
We use the eq
F=ma
By putting values
F=.43×20
F=8.6N
how much work is required to increase a velocity of 4kg object by 8m/s?
Answer:
4kg=4000,8m=60 times 8 =480
4000 times 480 over 100 =19200
Light passing through the center of a lens will carry on undeviated.
Select one:
a. False
b. True
I think the answer is B true
What does an atomic number represent in an atom?
number of protons
number of electrons
number of neutrons
number of protons and neutrons
The number of protons in an atom is known as the atomic number
Answer:
Number of protons
Explanation:
It is denoted by the letter Z
A car is moving down the street at 53km/h. A child suddenly runs into the street. If it takes the driver 0.75 sec to react and apply the brakes, how many meters will the car have moved before it begins to slow down? ANSWER IN METERS
Answer:
11.04m
Explanation:
Convert kilometers to meters: 53km/h x 1000 = 53,000m/h
Convert hours to seconds: 53m/h / 3600 =14.72m/s
14.72 (.75) = 11.04
a car mass 1500kg traveling at a uniform velocity of 30 m/s due east .the driver applies the brake to slow down the car to a velocity of 10 m/s east . what is the work done in slowing down the car ?
Answer:
this is the answer
Becky has 55 Oreos. She gives her friend some and is left with 13 Oreos. How many Oreos did Becky give to her friend?
Answer:
Becky gave her friend 42 Oreos
Explanation:
55-13=42
Answer:
42
Explanation: 55-13 = 42
Which force controls the size of an atomic nucleus?
1electromagnetic force
2weak nuclear force
3strong nuclear force
4gravitational force
Answer:
Strong nuclear force
Explanation:
Compound microscopes focus light through ______ to produce a magnified image.
The force pulling the moon toward Earth depends on the mass of the two bodies and which factor?.
Financial statements provide information to the public. True of False
Answer:
False
Explanation:
they just what they spent money on and thats not all of it
A scientist uses an electric motor to lift a load through a vertical distance of 2.0m.
He then increases the input power to the motor and repeats the experiment. The efficiency of the
motor does not change.
Which row correctly describes the effect that this has on the useful work done lifting the load and
the time taken to lift it?
work done
A
decreases
B
stays the same
decreases
time taken
decreases
decreases
stays the same
stays the same
с
D
stays the same
Answer: B
Explanation: efficiency is the useful energy supplied; useful energy supplied doesn't not change,
work done stays constant
in order to to increase the power of the motor, time would have to be decreased to get the wanted result..
When he increases the input power to the motor and repeats the experiment, work done stays the same but time taken decreases.
What is power?The quantity of energy moved or converted per unit of time is known as power in physics. The watt, or one joule per second, is the unit of power in the International System of Units. Power is also referred to as activity in ancient writings. A scalar quantity is power.
A motor's output power is calculated by multiplying its torque output by the angular velocity of its output shaft.
To lift a load through a vertical distance of 2.0m, in the both cases same amount of work-done happens because the displacement is same.
But as the input power, in second case, increases but the efficiency of the motor does not change, the time taken decreases ( as time taken = work done/power)
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which equation correctly represents the gravitational potential energy of a system?
Answer:ME= 1\2mv^2 + mgh
Explanation: I hope this helped.
The correctly represents the gravitational potential energy of a system is = - ΣGM₁M₂/R. Negative sign appears as gravitational force is attractive force.
What is potential energy?Potential energy is a form of stored energy that is dependent on the relationship between different system components. When a spring is compressed or stretched, its potential energy increases.
If a steel ball is raised above the ground as opposed to falling to the ground, it has more potential energy. It is capable of performing more work when raised.
Potential energy is a characteristic of systems rather than of particular bodies or particles; for instance, the system made up of Earth and the elevated ball has more potential energy as they become further apart.
Potential energy of a system of particles can be represented as summation of individual's potential energy. Hence, the correctly represents the gravitational potential energy of a system is = - ΣGM₁M₂/R.
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