False
If the object weighs more than the buoyant force then the object will sink.
This is because the buoyant force "pushes" the object upwards and the weight of the object "pushes" the object downwards. Since the force downwards is greater than the force upwards the item will sink, so this statement is False.
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Why does an object in motion stay in motion unless acted on by an unbalanced force? A) because forces are what stop and start motion B) because balanced forces can not exist in nature C) because motion is the inherent state of all matter Eliminate D) because motion, once begun, continues to accelerate
Carter pushes a bag full of basketball jerseys across the gym floor. The he pushes with a constant force of 21 newtons. If he pushes the bag 9 meters in 3 seconds, how much power does he use? (Hint: 1 watt = 1 .) A. 3 watts B. 7 watts C. 27 watts D. 63 watts E. 189 watts
Work = (force) x (distance)
Work = (21 Newtons) x (9 meters) = 189 Joules
Power = (work done) / (time to do the work)
Power = (189 Joules) / (3 sec)
Power = (63 watts/sec)
Power = 63 watts (D)
A scientist must only base his or her conclusions on observable evidence from investigation
is this a true of false cuz if so this it true
please help on this one ? :)
KE depends on velocity. It is easier to answer this question in terms of the earth.
The closer the object (earth/comet) is to the sun, the faster it moves. that means that the fastest moving point would be as the comet/earth passes through point C.
The slowest speed would be the furthest away from the sun which is point A.
Answer: The faster the planet moves the greater the Kinetic Energy.
The Slower the planet moves, the less the KE.
Point A is where it is slowest with the lowest amount of energy.
Discussion
The formula for KE is KE = 1/2mv^2. The mass of the comet or earth is a constant. It doesn't change no matter which point the comet passes through. If v goes down KE will go down. If v goes up, KE goes up.
You posted the same picture yesterday, and learned that ‘C’ is the point of the MOST kinetic energy because it’s closest to the sun and moving fastest. Then I suggested that you review Kepler’s 2nd law.
From that answer OR from Kepler, it should be clear that the LEAST kinetic energy is at ‘A’ .
What type of particle results from the formation of a covalent bond?
proton
ion
atom
molecule
Answer: molecule
Explanation:
Covalent bond is the type of bond formed when there is sharing of electrons between two similar or different atoms.
1. Proton is the subatomic particle of an atom which is present in the nucleus of atom and bears positive charge.
2. Ions are formed when there is a loss or gain of electrons in an atom.
3. An atom is smallest unit of a matter or substance.It consist of three subatomic particles : electrons, protons, neutrons.
4. Molecules of element is a pure substance which is formed by bonding of atoms of similar elements. Example: [tex]H_2[/tex] .Molecule of compound is a pure substance which is formed by bonding of atoms of different elements combined together in a fixed ratio by mass. Example: [tex]H_2O[/tex]
Which number is the same as 2.5 x 10^-3?
A. 0.00025
B. 0.25
C. 0.0025
D 0.025
the answer is C because 10^-3=1/1000 times 2.5=0.0025
The number that represents the standard form given, 2.5x10⁻³, is 0.0025. That is 0.0025 the same as 2.5x10⁻³. Option C is correct.
Understanding Standard FormStandard form can refer to different concepts depending on the context.
Standard Form of a Number:
In mathematics, the standard form of a number refers to a specific way of representing a number using digits and place value. In standard form, also known as scientific notation, a number is expressed as a product of a coefficient (a decimal number greater than or equal to 1 and less than 10) and a power of 10.
For example:
- The number 3,450,000 in standard form is written as 3.45 × 10^6.
- The number 0.0000625 in standard form is written as 6.25 × 10^-5.
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A roller coaster starts from rest at its highest point and then descends on its (frictionless) track. its speed is 40 m/s when it reaches ground level. part a what was its speed when its height was half that of its starting point? what was its speed when its height was half that of its starting point? 33 m/s 14 m/s 20 m/s 28 m/s
Given that,
Initial velocity , Vi = 0
Final velocity , Vf = 40 m/s
Acceleration due to gravity , a = 9.81 m/s²
Distance can be calculated as,
2as = Vf² - Vi²
2 * 9.81 *s = 40² - 0²
s = 81.55 m
For half height, that is, s = 40.77m
Vf= ??
2as = Vf² - Vi²
2 * 9.81 * 40.77 = Vf² - 0²
Vf² = 800
Vf = 28.28 m/s
Therefore, speed of roller coaster when height is half of its starting point will be 28 m/s.
Which statement best describes ionic bonding?
A. Electrons are free to move among many atoms.
B. Electrons are taken away from a full valence shell.
C. Electrons are shared between two atoms.
D. Electrons are transferred from one atom to another.
Electrons are transferred from one atom to another describes ionic bonding.
Option D
Explanation:
Ionic bonding requires at least one acceptor and one donor. ''Ionic bond'' is the movement of ''valence electrons'' between atoms. It gives two oppositely charged ions after taking place. The metal loses electrons and form a positive cation, and non metals gains electrons to become negative cations. Thus electron donor is a metal, and electron acceptor is usually a non metal. Thus, it is evident that in ionic bonding electrons are transferred between atoms.
1. A 3 kg lunch box is pushed across the lunch table. The acceleration of the lunch box is 2.0 m/s2. What was the net force applied to the lunch box?
2. Find the weight of a 10 kg rock. Remember, acceleration due to gravity is -9.8 m/s2.
Please show your work.
(1) Answer:
6 Newtons
Explanation:
The net force is (mass) x (acceleration) = (3 kg) x (2.0 m/s^2) = 6 N
(2) Answer:
-98 Newtons
Explanation:
Weight (force due to gravity) is (mass) x (gravitational acceleration) = (10 kg) x (- 9.8 m/s^2) = -98 N
The negative sign due to negative acceleration indicates the gravitational force pointing in the negative direction within the defined coordinate system.
plz help WILL GIVE BRAINLIEST
If force = mass x acceleration, What is the force applied to a 20 kg rock that is acceleration at a 20 m/s^2? Question 12 options: 40 N 0 N 20 N 10 N
If force = mass x acceleration, and you're walking down the street one day and you see a 20kg rock that is accelerating at 20 m/s², then you can say to yourself:
"Self ! That rock has 20 kg of mass and it's accelerating at 20 m/s², and since force = mass x acceleration, the net force acting on the rock must be (20kg) x (20 m/s²) which is 400 Newtons. How strange that 400 N is not one of choices under the question!"
Suchita makes a table to identify the variables used in the equations for centripetal force.
What quantities belong in cells X and Y?
X: tangential speed
Y: radius
X: radius
Y: tangential speed
X: centripetal force
Y: mass
X: mass
Y: centripetal force
Answer : The correct option is, X : radius and Y : tangential speed
Explanation :
Centripetal force : It is defined as a force which acts on the object to keep the object moving along a circular path.
Formula for centripetal force :
[tex]F_c=\frac{m\times V^2}{r}[/tex]
where,
[tex]F_c[/tex] = centripetal force
m = mass
r = radius
V = tangential speed
The quantity belong in cell X is radius and in the cell Y is tangential speed
Hence, the correct option is, X : radius and Y : tangential speed
Adding resistant transfer wires to complete a circuit will A. Decrease the rate of electrical flow B. Increase the rate of electrical flow C. Not change the rate of electrical flow D. Completely stop the flow of electricity
A. Decrease the rate of electrical flow
more resistance = lkess current
There is a potential difference of 12 V across a resistor with 0.25 A of current in it. The resistance of the resistor is?
Answer:
[tex]48 \Omega[/tex]
Explanation:
The resistance of the resistor can be calculated by using Ohm's law:
[tex]V=RI[/tex]
where
V is potential difference across the resistor
I is the current through the resistor
R is the resistance
In this problem, we have
[tex]V=12 V[/tex]
[tex]I=0.25 A[/tex]
So we can re-arrange Ohm's law to calculate the value of the resistance of the resistor:
[tex]R=\frac{V}{I}=\frac{12 V}{0.25 A}=48 \Omega[/tex]
How does the density of the metal in the crushed can compare with the metals density before the can was Crushed
dens = mass/volume. after crushing, vol less so density more. the actual density of the metal is the same, density of can changes
The density of a metal can, whether it is crushed or not, remains the same because density is an intrinsic property of matter, dependent only on the mass and volume of the substance. Changing the can's shape alters its volume but does not affect its mass or its density.
Explanation:The density of a substance is the ratio of its mass to its volume (Density = Mass / Volume). This physical property is intrinsic to the substance, meaning it doesn't change regardless of the quantity or form the material is in.
When you crush a metal can, you're changing its shape and thereby altering its volume. However, the mass remains the same because you haven't removed or added any material. As a result, the density of the metal in the crushed can stays the same as the metal's density before the can was crushed.
Let's consider a practical example: a block of brass and a piece of rebar. Both have the same mass and are made of the same metal, but the block of brass has a larger volume. Nevertheless, the densities of these substances remain constant. That's because density is an intrinsic property, reflecting the compactness of material in a substance. Hence, even though you change the can's shape (thus, its volume), you have no impact on the metal's density.
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Which concept explains why frequencies of light that fell below the frequency threshold of the metal did not eject electrons? Photons of different kinds of light carry different amounts of energy. Photons are absorbed by atoms as soon as light strikes the metal. Photons of light that has a frequency below the frequency threshold will not eject electrons.
Photons of different kinds of light carry different amounts of energy
einstein's photoelectric equation (and nobel prize citation)
Answer:
Photons of different kinds of light carry different amounts of energy.
Explanation:
As per Einstein's Theory of photoelectric effect we know that
[tex]h\nu = \phi + KE[/tex]
here we know that
[tex]\phi [/tex]= work function of the metal
KE = kinetic energy of ejected electron
[tex]\nu[/tex] = frequency of incident photon.
Now we know that photons of different frequency will have different amount of energy due to which the electrons get ejected out of the surface.
So if the photons have small energy or lesser energy then in that case the electron cannot ejected out
So threshold frequency is the minimum frequency at which electrons ejected out.
A sprinter generates a constant force of 52 N as he runs 100 m. How much work did he do?
If you are standing at a beach on Earth at the same time that the shadow of the moon falls across your location, what event would you be able to witness at that time? A solar eclipse B lunar eclipse C low tide D full moon
Answer:
The answer is A, a solar eclipse.
Explanation:
Determine the displacement of a plane that experiences uniform acceleration from 66 m/s north to 88 m/s north in 12 s.
The plane experiences an acceleration of 1.83 m/s². Using the formula for acceleration, the displacement of the plane during this time is found to be 1363.92 m north.
Explanation:To determine the displacement of a plane with uniform acceleration, we must first figure out the rate of acceleration. Acceleration is defined as the change in velocity divided by the time it takes for this change to occur. In this case the change in velocity (final velocity - initial velocity) is 88 m/s - 66 m/s = 22 m/s. This acceleration occurs over a period of 12 seconds, so the rate of acceleration is 22 m/s / 12 s = 1.83 m/s².
Now, with the rate of acceleration determined, the displacement of the plane can be calculated using the equation for acceleration d = vi*t + 0.5*a*t², where 'd' is displacement, 'vi' is initial velocity, 'a' is acceleration, and 't' is the time. After substituting the given values we get the answer as 66m/s * 12s + 0.5 * 1.83 m/s² * (12s)² = 1363.92 m. So the displacement of the plane during this period is 1363.92 m north.
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Which would take more force to stop and 10 seconds 8 kg ball rolling in a straight line at a speed of 0.2 m/s or a 4 kg ball rolling along the same path at a speed of 1 m/s
Answer:
It takes more force to stop the 4kg ball rolling at 1m/s.
Explanation:
To stop a ball rolling at 0.2 m/s in 10 seconds means the uniform deceleration needs to be (0.2/10) m/s/s = 0.02 m/s^2. To achieve that on a mass of 8kg requires a (force) = (mass) x (acceleration) = (8kg) x (-0.02 m/s^2) = -0.16 N (negative because it is an opposing force).
To stop a 4kg ball rolling at 1 m/s along the same path as above (implying in 10 seconds of uniform deceleration), will take a deceleration of (1/10 m/s^2) and a (force) = (4kg) x (-0.1 m/s^2) = -0.4 N.
It takes more force to stop the 4kg ball rolling at 1m/s.
(For your interest: you could decide this question also by calculating which ball has the larger kinetic energy and argue that, consequently, to stop that ball a larger force is needed. Kinetic energy is proportional to the square of force exerted)
The tenancy of a moving object to continue moving in a strait line or a stationary object to remain in place is called
The tendency of a moving object to continue moving in a straight line or a stationary object to remain in place is called inertia.
According to law of inertia, an object maintains its state of rest or motion unless acted upon by an external force. an object can not move on its own unless force is applied on it to move it. also an object can not come to stop on its own unless acted upon by an external force to stop it.This is also known as newton's first law.
what is the net force acting on Hector and the toboggan?
a. 245 N
b. 735 N
c. 490 N
d. 980 N
Answer:
C.490N
Explanation:
Hakeem was dismayed to discover that he offended coworkers by standing 2 feet away from them during business conversations. In the U.S., what distance would have been more appropriate? PS 2100
Final answer:
In the U.S., a more appropriate distance for business conversations is maintaining an arm's length of space between each other when talking face to face.
Explanation:
In the U.S., a more appropriate distance for business conversations is maintaining an arm's length of space between each other when talking face to face. This means standing approximately 3-4 feet away from the person you are conversing with.
Standing 2 feet away from coworkers may be considered too close and can make them uncomfortable. It's important to pay attention to cues from coworkers, and if they seem uncomfortable, it's best to adjust your distance accordingly. Remember that personal space preferences can vary among individuals, but generally, maintaining an arm's length of space is a good guideline to follow in the U.S.
Which is the most widely held ideal of the US political culture?
A. belief in a limited government and protect individual liberties.
B. belief in a unitary government and centralized decision making.
C. belief in a strong government that monitors individual actions.
D. belief in a weak central government and strong local governments.
The correct answer is A.
Quizlet is always my trusty sidekick!
I hope this helps!
Cheers, July.
Which federal agency makes sure federal wildlife laws are followed?
) US Forest Service
) US Fish and Wildlife Service
) Bureau of Land Management
) National Park Service
Answer:
US Fish and Wildlife Service
Explanation:
There are different federal agencies in the United States of America such as US Forest Service, US Fish and Wildlife Service, Bureau of Land Management and National Park Service. The US Forest Service is the agency that conducts the management of land and other agricultural related services. The Bureau of Land Management is involved with the administration of public lands in the United States. The National Park Service generally conducts the management of all the national parks in the United States. Therefore, the agency that ensures that federal wildlife laws are strictly adhere to is the US Fish and Wildlife Service.
A student throws a coin vertically downward from the top of a building. The coin leaves the throwers hand with a speed of 15.0 m/s. What is the magnitude of its velocity after falling 10.0 m?
A.) 18.0 m/s
B.) 14.5 m/s
C.) 20.5 m/s
D.) 19.8 m/s
Answer:
The correct answer is option C
Explanation:
We have the equation of motion, [tex]v^2=u^2+2as[/tex], where v is the final velocity, u is the initial velocity, a is the acceleration and s is the displacement.
Here initial velocity = 15 m/s
Displacement = 10 m
Acceleration = acceleration due to gravity = 9.8 m/s²
Substituting to get final velocity,
[tex]v^2=u^2+2as\\ \\ \\v^2=15^2+2*9.8*10\\ \\ v=20.52m/s[/tex]
So the correct answer is option C
In Physics, the magnitude of the velocity of a coin thrown downward from a building can be calculated using the equation of motion. Here, the initial velocity of the coin is added to the effect of gravity. The final downward speed after falling 10.0 m is approximately 20.5 m/s.
Explanation:The subject here is Physics, more specifically, mechanics relating to motion under gravity. It's important to know that when an object is dropped, it accelerates due to gravity. The standard rate due to Earth's gravity is 9.8 m/s^2. However, in this case, the coin is thrown downward (i.e., in the direction of gravity), which means we must add this initial speed to gravity's influence.
The magnitude of velocity is calculated using this equation: final velocity = initial velocity + acceleration due to gravity * time. But you have an issue here. You don't have the time. Instead, you have the distance fallen. We need to use the second equation of motion: final velocity^2 = initial velocity^2 + 2*acceleration*distance. Substituting the given values: final velocity^2 = (15 m/s)^2 + 2*9.8 m/s^2 * 10.0 m = 225 m^2/s^2 + 196 m^2/s^2. The square root of the sum gives us the final velocity which is approximately 20.5 m/s, as velocity is a scalar quantity, we take the magnitude, so we get 20.5 m/s
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Atoms of element A decay to atoms of element B with a half-life of 20,000 years. If there are 10,000 atoms of A to begin with (and 0 atoms of B), how long will it take for there to be 2,500 atoms of A? A) 20,000 years B) 40,000 years C) 60,000 years D) 100,000 years
T = half life period of decay for atoms of element A = 20,000 years
N₀ = initial number of atoms of element A = 10,000 atoms
N = final number of atoms after time "t" = 2500 atoms
t = time of decay = ?
λ = decay constant = ?
decay constant is given as
λ = 0.693/T
λ = 0.693/20,000
λ = 0.00003465 years⁻¹
atoms after decay for time "t" is given as
N = N₀ [tex]e^{-\lambda t}[/tex]
inserting the values
2500 = (10000) [tex]e^{-(0.00003465) t}[/tex]
t = 40,000 years
so correct choice is
B) 40,000 years
Answer:
B) 40,000 years
Explanation:
You would have only 2500 of A left after 40,000 years. This represents 2 half-lives. After 20,000, ther would be 5,000 of A left and after another 20,000, it would be reduced to 2,500.
Which of the following statements best describes a covalently bonded material?
A. It is a conductor.
B. It is an insulator.
C. It readily allows electricity to flow.
D. It contains delocalized electrons.
It is an insulator because it doesn't conduct electricty.
Answer: Option (B) is the correct answer.
Explanation:
A conductor is defined as a substance that allows flow of electrons through it due to which there will be flow of electric current.
Whereas an insulator is defined as a substance through which there will be very less or no flow of electrons. As a result, there will be no flow of electric current through it.
Also, when a material is covalently bonded then it means sharing of electrons has taken place between its atoms. And, covalent materials do not allow flow of electric current through it because of no presence of free electrons or ions.
Thus, we can conclude that the statement it is an insulator best describes a covalently bonded material.
Elaborate on the reason why heating water up will increase the rate of dissolving for a solute.
This is because heat energy is released when the solute dissolves in solution. Increasing temperature introduces more heat into the system. ... This increase in kinetic energy allows greater movement in the gas particles resulting in the intermolecular bonds between the gas solute and solvent being broken.
Answer:D
Explanation:
A stopwatch starts while race car travels at 4 m/s from the pit area and accelerates at a uniform rate to a speed of 23 m/s in 2 s moving on a circular track of radius 527 m.
Assuming constant tangential acceleration, find
(a) the tangential acceleration, and
(b) the radial acceleration,at the instant when the speed is v = 16
Once you have both of those ... find the magnitude of a at any moment
(a) Tangential acceleration: [tex]9.5 m/s^2[/tex]
The tangential acceleration is given by:
[tex]a_t = \frac{v-u}{t}[/tex]
where
v = 23 m/s is the final velocity of the car
u = 4 m/s is the initial velocity of the car
t = 2 s is the time taken for the car to accelerate from u to v
Substituting the numbers into the formula, we find
[tex]a_t = \frac{23 m/s-4 m/s}{2 s}=9.5 m/s^2[/tex]
(b) Radial acceleration: [tex]0.49 m/s^2[/tex]
The radial acceleration is equivalent to the centripetal acceleration, which is given by:
[tex]a_r = \frac{v^2}{r}[/tex]
where
v = 16 m/s is the tangential speed
r = 527 m is the radius of the circular orbit
Substituting numbers, we find
[tex]a_r = \frac{(16 m/s)^2}{527 m}=0.49 m/s^2[/tex]
Will Mark BRAINLIEST!!!!!!!!!!!!!!!!!!!
3. Jessica stretches her arms out 0.6 m from the center of her body while holding a 2 kg mass in each hand. She then spins around on an ice rink at 1.1 m/s.
a. What is the combined angular momentum of the masses?
b. If she pulls her arms in to 0.15 m, what is her linear speed if the angular momentum remains constant?
3.
a)
r = distance of each mass in each hand from center = 0.6 m
m = mass of each mass in each hand = 2 kg
v = linear speed = 1.1 m/s
L = combined angular momentum of the masses = ?
Combined angular momentum of the masses is given as
L = 2 m v r
L = 2 (2) (1.1) (0.6)
L = 2.64 kg m²/s
b)
v' = linear speed when she pulls her arms = ?
r' = distance of each mass from center after she pulls her arms = 0.15 m
Using conservation of momentum , angular momentum remains same, hence
L = 2 m v' r'
2.64 = 2 (2) (0.15) v'
v' = 4.4 m/s