Paulina kicks a football. It accelerates towards the goal at 10 m/s². The ball has a mass of 430 g. With what force did Paulina kick the ball?

Answer:

yes it does exert a force, it pushes it up

Explanation:

this is called normal force

if it didn't exert a force the book would keep going down

according to newton every force has an equal amd opposite reaction

so the book exerts a force on the table and vice versa

hope this helped

probably a little late on this but the dude got everything wrong heres a screenshot of the answers.

Solubility: the ability of a substance to dissolve in another.

Density: the amount of mass in a given volume.

Buoyant force: the upward force on an object in a fluid.

Conductivity: the ability of a substance to transfer heat or electricity.

Boiling point: the temperature at which a liquid becomes a gas.

Solubility can be defined as a measure of how readily a substance dissolves in a solvent to form a solution.

Density can be defined as mass all over the volume of an object.

Buoyancy can be defined as an upward force created by the fluid (liquid) displaced by an object.

Conductivity can be defined as the ability of an object, substance or body to transfer heat or electricity to another.

Boiling point is the temperature at which a physical matter changes phase from liquid to gas.

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Answer:

D :)

Explanation:

When an impact causes the car to suddenly change its motion, (D) the people in the car will continue to move in the same direction and at the same speed as before the impact.

Newton's first law of motion states that Unless influenced by an imbalanced force, a body at rest stays at rest, and a body in motion keeps moving in a straight path at a constant pace. This law is commonly known as law of inertia and the resistance of a body to maintain its state of rest is called inertia of rest, same as, the resistance of a body to maintain its state of motion is called inertia of motion.

When a car is moving with certain speed, the car along with the people inside the car is in inertia of motion. In an event of accident, the car comes in rest in no time but the man in the car is still in inertia of motion. So, his body moves forward in the car which may cause injuries. To prevent such injuries, the people inside a car are advised to use safety belts.

So, correct answer  is option (D).

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A projectile is an object that is launched into the air and moves under the influence of gravity alone. The velocity of a projectile can be broken down into two components: the vertical component and the horizontal component. The vertical component of the velocity is the speed at which the object moves up or down, while the horizontal component is the speed at which it moves side to side.

The following are the methods to obtain the vertical and horizontal components of a projectile's velocity:

   If the initial velocity and the launch angle of the projectile are known, we can use trigonometry to calculate the vertical and horizontal components of velocity.

The horizontal component of the velocity is given by:

Vx = V * cosθ

where Vx is the horizontal velocity, V is the initial velocity of the projectile, and θ is the angle of launch.

The vertical component of the velocity is given by:

Vy = V * sinθ

where Vy is the vertical velocity.

   If the time of flight and the maximum height of the projectile are known, we can use kinematic equations to calculate the vertical and horizontal components of velocity.

The time of flight of a projectile is the time it takes to reach its maximum height and then fall back down to its original height. The maximum height reached by the projectile is the highest point in its trajectory.

The vertical component of the velocity can be calculated using the formula:

Vy = (2gh)^0.5

where Vy is the vertical velocity, g is the acceleration due to gravity, and h is the maximum height of the projectile.

The horizontal component of the velocity can be calculated using the formula:

Vx = d / t

where Vx is the horizontal velocity, d is the horizontal distance traveled by the projectile, and t is the time of flight.

In summary, the vertical and horizontal components of a projectile's velocity can be obtained using trigonometry if the initial velocity and launch angle are known or by using kinematic equations if the time of flight and maximum height are known.

Answer:

50.25 j

Explanation:

Alex HEYYYYYYYYY

Answer:

The table shows the specific heat capacities of various substances. How much energy is required to raise the temperature of 5g of air by 10°C? Use the table below to help you.

"10 J" is WRONG

The right answer is "50.25 J"

Explanation:

hope this helps

Answer: Voltage = (current) x (resistance)

Voltage = (1.5 A) x (2 ohms)

In order to MAKE 1.5 A of current flow through the toy car, you have to PROVIDE 3 volts from the battery.

Answer:

Dude this is based on some egg you have

Explanation:

Answer:

9800N

Explanation:

Since it is falling freely, the only force on it is its weight, w. w = m ⋅ g = 1000kg ⋅ 9.8ms2 = 9800N

Action-reaction pairs are forces that operate on separate objects in opposing directions and at identical magnitudes. Never do they affect the same thing. We learn that forces are interactions from Newton's third law.

When two bodies contact, they exert an equal and opposite force on one another in accordance with Newton's third rule of motion. Action-reaction forces are made up of these forces.

Think about how a baseball bat and a ball interact, for instance. The bat forces the ball to the right while the baseball forces the bat to the left. The action-reaction force pair is made up of these two forces acting on two separate objects together.

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Answer:

what is your question though

Explanation:

??? ??? ??? ??? ???

Answer:

P₁ = 1.0 atm

V₁ = 35 L

P₂ = 0.75 atm

Formula:

P₁V₁ = P₂V₂

Solution:

P₁V₁ = P₂V₂

V₂ = P₁V₁ / P₂

V₂ = (1.0 atm)(35 L) / 0.75 atm

V₂ = 47 L

Final Answer:

V₂ = 47 L

A ball is thrown straight down from the top of a 220-foot building with an initial velocity of −22 feet per second. What is its velocity after 3 seconds is 7.4 feet per second.  Its velocity after falling 108 feet ix  50.99 feet per second.

Given data: the height of the building = 220 feet, initial velocity of the ball = -22 feet per second, time taken to fall = 3 seconds.

After 3 seconds, the velocity of the ball can be calculated using the following formula: Vf = Vi + gt

Where, Vf = final velocity of the ball, Vi = initial velocity of the ball, g = acceleration due to gravity (9.8 m/s^2) for downward motion, t = time taken to fall

Vf = -22 + (9.8 x 3)

Vf = -22 + 29.4

Vf = 7.4 feet per second

Therefore, the velocity of the ball after 3 seconds is 7.4 feet per second.

After falling 108 feet, the velocity of the ball can be calculated using the following formula:Vf² = Vi² + 2gh,

Where,Vf = final velocity of the ball, Vi = initial velocity of the ball, g = acceleration due to gravity (9.8 m/s^2) for downward motion, h = distance fallen

Vf² = (22²) + 2(9.8 x 108)Vf² = 484 + 2116.8

Vf² = 2600.8Vf = √2600.8Vf = 50.99 feet per second

Therefore, the velocity of the ball after falling 108 feet is 50.99 feet per second.

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Answer: b. 420 m/s

Explanation: ap3x

The frequency of the wave with the speed of 345 m/s and wavelength of 23 m is 15 Hz. With the same frequency the speed of wave t 28 m wavelength will be 420 m/s.

Frequency of a wave is the number of wave cycles per unit volume. It is the inverse of time period thus have the unit of s⁻¹ which is equivalent to one Hz. Frequency is inversely proportional to the wavelength.

The relation between frequency, wavelength and speed of a wave is written as follows:

c = νλ

Given that, speed of the wave = 345 m/s

wavelength =23 m

frequency = speed/wavelength

v = 345 m/s /23 m = 15 Hz.

New wavelength = 28 m

frequency = 15 Hz

then speed = 15 Hz × 28 m = 420 m/s.

Hence, the speed of the wave become 420 m/s. Option B is correct.

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Answer:

0.12 seconds

Explanation:

11.The time at 75° East longitude would be 1 hour and 20 minutes behind. 12.The time at 135° degrees East longitude would be 4 hours ahead. and 13. the time in Lima, Peru (15° South latitude, 75° West longitude) would also be 9:30 AM.

At 2:00 AM at 90° East longitude, the time at 75° East longitude would be 1 hour and 20 minutes behind. This is because for every 15 degrees of longitude, there is a time difference of approximately 1 hour. Since the two longitudes in question have a difference of 15 degrees, we can divide this by 15 to calculate the time difference.

If it is 8:00 PM at 15° East longitude, the time at 135° East longitude would be 4 hours ahead. Similarly, for every 15 degrees of longitude, there is an approximate time difference of 1 hour. Since the two longitudes in question have a difference of 120 degrees, we can divide this by 15 to calculate the time difference.

There is a 7-hour difference** between 105° West longitude and the Prime Meridian (0° longitude). The Prime Meridian, passing through Greenwich, England, serves as the reference point for determining time zones. As one moves westward from the Prime Meridian, each 15 degrees of longitude corresponds to a time difference of approximately 1 hour. Therefore, the time at 105° West longitude would be 7 hours behind the time at the Prime Meridian.

If it is 9:30 AM in New York (41° North latitude, 75° West longitude), the time in Lima, Peru (15° South latitude, 75° West longitude) would also be 9:30 AM. The latitude does not affect the time difference between the two locations. However, since both locations have the same longitude (75° West), they would experience the same local time. The time difference between different latitudes is primarily significant for determining time zones rather than the actual time within a specific time zone.

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the magnitude of the linear momentum of the electron just after it collides with the photon is (7.558 × 10⁻²⁶) kgm/s.

Let the photon's wavelength before it collides. =  λ

After a collision, the photon's wavelength equal = λ'

before a collision, the photon's frequency = f

After-collision photon frequency = f'

Pp = (h/) is the momentum of the photon prior to collision.

Prior to collision, the photon's momentum is given by Pp' = (h/'), where h is Planck's constant.

Let P represent the electron's post-collision momentum.

According to Compton's theory, the elastic collision between a photon and an electron abides by the principles of momentum and energy conservation.

The conservation of momentum

Momentum before collision = momentum after collision

Before momentum collision = Pp.

After-collision momentum = (Pp' + P)

Pₚ = (Pₚ' + P)

P =  (Pp - Pp') = (h/) - (h/') = h[(1/) - (1/')]

With the exception of the photon's after-collision wavelength, all of the variables needed to determine the electron's momentum are known.

We utilize the Compton's wavelength formula to determine this.

Compton established from the principle of conservation of mass and momentum that the wavelength of the electron following a collision i λ's given by

λ' - λ = (h/m₀c) (1 - cos θ)

where; h = Planck's constant = 6.63 × 10⁻³⁴ J.s

m₀ = mass of the electron = 9.11 × 10⁻³¹ kg

c = speed of light = 3.0 × 10⁸ m/s

θ = angle of scattering of the photons after collision = 60°; cos 60° = 0.5

λ = 0.102 nm = 1.02 × 10⁻¹⁰ m

λ' - λ = [(6.63 × 10⁻³⁴/(9.11 × 10⁻³¹ × 3.0 × 10⁸)] × 0.5

λ' - λ = 1.213 × 10⁻¹² m

λ' = λ + (1.213 × 10⁻¹²) = (1.02 × 10⁻¹⁰) + (1.213 × 10⁻¹²) = (1.032 × 10⁻¹²) m

P = (Pₚ - Pₚ') = (h/λ) - (h/λ') = h[(1/λ) - (1/λ')]

P = h[(1/λ) - (1/λ')] = (6.63 × 10⁻³⁴) [(1/(1.02 × 10⁻¹⁰)) - (1/(1.032 × 10⁻¹²))] = (6.63 × 10⁻³⁴) (113999088) = (7.558 × 10⁻²⁶) kgm/s

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Answer:

value of x=35°

y=72.5°

hope it helps you

make me brainliest plz

From the calculations, the total heat involved in the entire process is 9.72 × 10^6 J.

The term specific heat capacity is the heat that is gained when 1 Kg of a body undergoes a temperature rise of 1 K.

a) H = mcdT

m = mass

c = specific heat

dT = temperature change

H = 3.62 kg ×  2020J/kg°C × (157 - 100)

H = 416806.8 J

b) H = mL

H = 3.62 kg × 2,260,000 J/kg

H = 8181200 J

c) H = 3.62 kg × 4200 J/kg°C × ( 100 -26)

H = 1125096 J

Total heat: 416806.8 J + 8181200 J + 1125096 J = 9.72 × 10^6 J

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Answer:

The Answer is gonna be True

Explanation : A hydrogen bond is a weak type of force that forms a special type of dipole-dipole intermolecular attraction when a hydrogen atom is bonded directly to one of the most electronegative elements like nitrogen (N), oxygen (O) or fluorine (F). This causes the hydrogen to acquire a significant amount of positive charge.

Or

Hydrogen bond is an attractive force between a partially positive charged hydrogen and a partially negative charged atom (oxygen and nitrogen). This is a very weak bond and strength of hydrogen bond (5-10 Kcal per bond) is much less than the strength of covalent bond. Hydrogen bonds are usually showed as dotted lines between two atoms.

This is the Answer for your question :3

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Answer: The attraction of opposite charges between hydrogen and oxygen does not form a weak bond because oxygen-hydrogen makes hydrogen bonding. Hydrogen bonding is a very attraction force

11. The wavelength of the light ray in air is 0.589 x 10⁻⁶ m.

12. Angle of incidence for the light ray at point P is 43.23°.

13. The absolute index of refraction for medium X is 1.46

It states that the ratio of sine of angle of incidence and angle of refraction is equal to the refractive index of first medium to the second medium.

sini/sinr = n₁/n₂

11. The wavelength is related to the frequency as

λ = c/f

where c = 3 x 10⁸ m/s and frequency f = 5.09x 10¹⁴ Hz

Put the values, we get

λ = 3 x 10⁸/ 5.09x 10¹⁴

λ =0.589 x 10⁻⁶ m

Thus, the wavelength of the light ray in air is 0.589 x 10⁻⁶ m.

12. Given the angle of incidence is i, angle of refraction r =90° ,  n₂ = Refractive index of medium X = 1.46 and n₁ = Refractive index of air = 1

Substituting the values into Snell's law expression we get,

sin i= sin 90 x 1/1.46

i = 43.23 degrees

Thus, the angle of incidence is  43.23 degrees.

13. The refractive index is the ratio of speed of light  in vacuum to the speed of light in the medium X.

n = c/v₂

If v₂ is the velocity of light in medium X, then

sin i / sin r  = v₂/v₁

sin 43.23 / sin 90 =  v₂/ 3 x 10⁸

v₂ = 2.055 x 10⁸ m/s

So, the refractive index be

n = 3 x 10⁸/2.055 x 10⁸

n = 1.46

Thus, absolute index of refraction for medium X is 1.46

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The cumulative distance traveled by the bird is 3.12 km.

The cumulative distance of the bird is calculated as follows;

Apply the principle of relative velocity.

Vbt - Vrt = L

(Vb - Vr)t = L

where;

Substitute the given parameters and solve for time of motion,

(41 - 8.2)t = 2.5

32.8t = 2.5

t = 2.5/32.8

t = 0.076 hr

Distance traveled by the bird = 0.076hr x 41 km/hr = 3.12 km

Thus, the cumulative distance traveled by the bird is 3.12 km.

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Answer:

c

Explanation:

answer is c I hope it is correct

The bullet's initial speed was roughly 0.108 metres per second.

We can use the conservation of momentum to solve this problem. Before the collision, the bullet has momentum p1 = m1 * v1, where m1 is the mass of the bullet and v1 is its velocity. After the collision, the bullet and the block have a combined momentum p2 = (m1 + m2) * v2, where m2 is the mass of the block with the embedded bullet and v2 is their common velocity.

Because momentum is conserved, we can equate the two momenta:

p1 = p2

m1 * v1 = (m1 + m2) * v2

We are given the masses m1 = 6.90 g and m2 = 1.10 kg. We are also given the final velocity v2 = 1.80 m/s. Solving for the initial velocity v1, we get:

v1 = (m1/m2) * (v2 - v1)

v1 = (6.90 g / 1.10 kg) * (1.80 m/s - 0)

v1 = 0.108 m/s

Therefore, the original speed of the bullet was approximately 0.108 meters per second.

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Explanation:

Yes,  evidently, the process is consistent with the scientific process because in scientific process falsification and modification are two very important traits. So this new concept have modified the existing theories.

Through the modification a theory is adjusted without undermining other discovering made through the theory's prediction.

There are many other evidences that prove this fact for example Einstien's Theory of relativity also changes the existing concepts.

Answer:c

Explanation:

The value of resistor R that gives the circuit in the figure a time constant of 22 μs is 220 Ω.

The circuit that is in the figure is shown below:Given that time constant (RC) = 22 μs. To find the value of resistor R, we need to use the formula for the time constant:

RC = τ, where R is the resistance and C is the capacitance of the circuit.

Rearranging the above formula, we get:R = τ / C

Where τ is the time constant and C is the capacitance of the circuit.

From the figure, the capacitance is given as 0.1 μF

.Substituting the values of τ and C in the above formula, we get:

R = (22 × 10⁻⁶ s) / (0.1 × 10⁻⁶ F)

R = 220 Ω

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The system described by the transfer function G(s) = -co² s² + 2a + w², with a damping ratio of 1.3 and a natural frequency of 0.5, has an overdamped unit step response. So, the correct option is (E)

The transfer function of the system is given as G(s) = -co² s² + 2a + w², where co represents the damping ratio, a represents an arbitrary constant, and w represents the natural frequency of the system. We are given that the natural frequency is 0.5 and the damping ratio is 1.3.

To determine the type of unit step response, we need to analyze the damping ratio (co) in relation to the critical damping value (co_critical).

The critical damping ratio (co_critical) is defined as the value where the system is on the threshold between being overdamped and underdamped. It is given by the formula co_critical = 2 * sqrt(a * w²).

In our case, the natural frequency (w) is 0.5, so we can calculate co_critical as follows: co_critical = 2 * sqrt(a * 0.5²).

Since the damping ratio (co) is given as 1.3, we can compare it with co_critical to determine the type of unit step response.

If co > co_critical, the system is considered overdamped (Option E).

If co = co_critical, the system is considered critically damped (Option D).

If co < co_critical, the system is considered underdamped (Option C).

Based on the given values, we can determine that the system is overdamped (Option E) because the damping ratio (1.3) is greater than the critical damping ratio.

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