A player throws a football 50.0 m at 61.0° north of west. what is the westward component of the displacement of the football?

(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]

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]

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.

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’ .

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]

Answer:  True

The statement " the synthesis of a large collection of  information that encompasses well tested and verified hypothesis about certain aspects of natural world is known as "scientific theory".    

It was proposed by Charles Darwin and Alfred Russel in the mid 19th century.  

Typically, it is about the relationship between various facts and is a way of providing a concise explanation for what's been observed. A scientific theory is a well- substantiated explanation of an aspect of the natural world.

Answer:

If it is eight meters per second, and the total distance he has to travel is four hundred meters to complete the race, you divide the total length needed to travel by the average speed per second to see the amount of seconds required to complete the race at that speed.8 meters per second: Speed of runner400 meters: Total distance400/8=50.50 seconds to complete the race at the eight of 8m/s.

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.

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.

Standard 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.

Learn more about standard form here:

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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)

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.

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.

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.

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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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

(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.

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.

The correct answer is A.

Quizlet is always my trusty sidekick!

I hope this helps!

Cheers, July.

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)

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:

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!"

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.

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.  

Answer:

The answer is A, a solar eclipse.

Explanation:

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.

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.

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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A. Decrease the rate of electrical flow

more resistance = lkess current

Answer:

C.490N

Explanation: