A ball is thrown straight upward with an initial velocity of 12 m/s. How long would it take the ball to reach s spot 15 meters directly below where it was thrown?

Answer:

Resistance is the measure of the opposition to current flow in an electrical circuit

Resistance refers to the opposition or hindrance that a material or object offers to the flow of electric current. It is a fundamental concept in the field of electrical engineering and physics.

Resistance is measured in ohms (Ω) and is denoted by the symbol "R."

In electrical circuits, resistance is caused by various factors, including the type of material, its dimensions, and its temperature.

The primary element contributing to resistance is the collisions between electrons and atoms within the material through which the current is passing.

When an electric current flows through a conductor, such as a wire, the electrons move along the path of the conductor. However, as they do so, they encounter resistance.

This resistance causes the electrons to collide with atoms, which generates heat and dissipates energy.

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Answer:

shreya Sister's answer is correct hope it's help you have a good day

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Answer:

Wavelength = 0.68 meters.

Explanation:

Wavelength gives the distance between a point of rarefaction and the next compression point, in the resulting sound.

Given the following data;

Frequency = 500 Hz

Speed of sound = 340 m/s

To find the wavelength;

Wavelength = speed/frequency

Wavelength = 340/500

Wavelength = 0.68 meters

Answer:

will explod

Explanation:

Explanation:

The decibel scale is a logarithmic scale where each bel or 10 decibels correspondents to a factor of ten. A power intensity of 10^(-12) watts per square meter is the standard reference for a SPL of 0 db. So an SPL of 98 db corresponds to a power intensity of 10^(9.8)*10^(-12) or 10^(9.8–12) w/m^2.

0.006309573 w/m^2.

Answer:

c

Explanation:

Answer:

the answer to your question is c

Explanation:

Answer:

mechanical energy

Explanation:

because except mechanical energy all posseses particles

Answer:

v = 19.33 m / s   South

Explanation:

To solve this exercise we must use the conservation of momentum, for which we must define a system formed by the two cars, therefore the forces during the collision are internal and therefore the moment is conserved.

Since it is a vector quantity, we are going to work on each axis, the x axis is in the East-West direction

initial instant. Before the crash

        p₀ = m 0 + M v₂ₓ

final instant. Right after the crash

        p_f = (m + M) vₓ

        p₀ = 0_pf

        M v₂ₓ = (m + M) vₓ

In this case m is the mass of the car and M the mass of the SUV

        vₓ = [tex]\frac{M}{m+My}[/tex]  v₂ₓ            (1)

in the Y axis (North - South direction)

initial instant

       p₀ = m v_{1y} + M 0

final moment

       p_f = (m + M) v_y

       p₀ = p_f

       m v_{1y} + M 0 = (m + M) v_y

       v_y = [tex]\frac{m}{m+M} \ v_{1y}[/tex]       (2)

With these speeds we can use the relationship between work and the variation of kinetic energy, in this part the two cars are already united.

         W = ΔK

friction force work is

         W = - fr d

the friction force is described by the equation

         fr = μ N

Newton's second law

         N-W = 0

         N = W

we substitute

         W = - μ (m + M) g d

as the car stops the final kinetic energy is zero and

the initial kinetic energy is

         K₀ = ½ (m + M) v²

we substitute

         - μ (m + M) g d = 0 - ½ (m + M) v²

            μ g d = ½ v²

            v² = 2 μ g d

the distance traveled can be found with the Pythagorean theorem

        d = [tex]\sqrt{x^2+y^2}[/tex]

        d = [tex]\sqrt{5.48^2 + 6.37^2}[/tex]

        d = 8.40 m

let's calculate the speed

         v² = 2 0.75 9.8 8.40

         v = √123.48

         v = 11.11 m / s

this velocity is in the direction of motion so we can use trigonometry to find the angles

          tan θ = y / x

          θ = tan⁻¹ y / x

          θ = tan⁻¹ (-5.48 / -6.37)

          θ = 40.7º

Since the two magnitudes are negative, this angle is in the third quadrant, measured from the positive side of the x-axis in a counterclockwise direction.

          θ'= 180 + 40.7

          θ’= 220.7º

In the exercise they indicate the the sedan moves in the y-axis, therefore

          sin θ'= v_y / v

          v_y = v sin 220.7

          v_y = 11.11 sin 220.7

          v_y = -7.25 m / s

the negative sign indicates that it is moving south

To find the speed we substitute in equation 2

          v_y = [tex]\frac{m}{m+M} \ v_{1y}[/tex]

          v_{1y} = v_ y   [tex]\frac{m+M}{m}[/tex]

let's calculate

         v_{1y} = -7.25    [tex]\frac{1500+2500}{1500}[/tex]

         v_{1y} = - 19.33 m/s

therefore the speed of the sedan is v = 19.33 m / s with a direction towards the South

The speed of the blocks after the collision is most nearly will be Vf= 2.376 m/s.

Collision is defined as when two bodies of different masses move towards each other with a particular speed, then there will be three cases after the collision.

Elastic collision, in which the kinetic energy of the object remains constant.

Inelastic collision in which the kinetic energy is not conserved after the collision.

Completely elastic collision, in which the masses stick together after the collision and  move with a final speed.

It is given in the question that

Mass of body A= 2 kg

Velocity of body A= ?

Mass of body B=3 kg

Velocity of body B= 0 m/s

since the body is coming from the inclined place at an angle 30 so the height will be calculated as:

[tex]\rm Sin\theta=\dfrac{h}{H}[/tex]

Inclined plane H=3.6 m

[tex]\rm Sin30=\dfrac{h}{3.6}[/tex]

[tex]h=1.8 m[/tex]

Now the initial velocity of the object from the conservation of energy

[tex]m_Agh=\dfrac{1}{2}m_Av_A^2[/tex]

[tex]v_A=\sqrt{2gh[/tex]

[tex]v_A=\sqrt{2\times9.81\times 1.8}=5.94\ \frac{m}{s}[/tex]

Now form the collision is completely elastic so the momentum before collision will be equal to after collision.

[tex]m_Av_A+m_Bv_B=(m_A+m_B)v_f[/tex]

[tex](2\times 5.94)+(3\times0)=(2+3)v_f[/tex]

[tex]v_f=\dfrac{11.88}{5}=2.376\ \frac{m}{s}[/tex]

Thus the speed of the blocks after the collision is most nearly will be Vf= 2.376 m/s.

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Answer: 44.57°C

Explanation:

The following can be deduced from the question:

Specific heat of water = 4.186 J/kg

From the question, we can infer that 625 × 4.186 joules of heat will be lost when there's a 1°C drop of water.

We then calculate the amount if degrees that it'll take to cool for 7.96 x 10⁴J. This will be:

= 7.96 × 10⁴ /(625 × 4.186)

= 79600/(625 x 4.186)

= 79600/2616.25

= 30.43°C

The final temperature will then be:

= 75.0°C - 30.43°C

= 44.57°C

Answer:

angular speed ω = 2PI / T rad/sec  

ω^2*r = M*G/r^2

r = ³√ M*G/ω^2 = ³√6.42*10^23*6.67*10^-11*88640^2/39.5 = 2.04*10^7 m

Explanation:

A geosynchronous satellite orbits Mars once every Martian day, 88640 s then the radius of the orbit will be equal to 2.04 × 10⁷ m.

The fundamental force of attraction operating on all matter is recognized as gravity, also spelled gravity, in mechanics. It has no impact on identifying the interior properties of common matter because it is the weakest force known to exist in nature.

As per the given data in the question,

Mass, m = 6.42 x 10²³ kg

Time, T = 88640 s

Use the formula of velocity for satellite,

v = 2πR/T

Where R represents the radius

Use the formula of centripetal acceleration,

[tex]a_c[/tex] = v²/R

Thus;

[tex]a_c[/tex] = (2πR/T)²/R

= 4π²R/T²

The formula for gravitational acceleration is:

[tex]a_g[/tex] = Gm/R²

G = 6.674 × 10⁻¹¹ m³/kg. s²

Now, the satellite's gravitational acceleration is what is responsible for its centripetal acceleration. Thus,

Centripetal acceleration = gravitational acceleration.

Thus;

4π²R/T² = Gm/R²

Making R the subject gives;

R = ∛(GmT²/4π²)

Substitute the values in the above equation,

R = ∛((6.674 × 10⁻¹¹ × 6.42 x 10²³ × 88640²)/(4 × π²))

R = 2.04 × 10⁷ m

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Answer:

when the trough of one wave matches the crest of another

Explanation:

just took the test

Answer:

V=21.0211m/s

Explanation:

Use V=vi+at

So, V=17.46m/s+(1.49m/[tex]s^{2}[/tex])(2.39s)= 21.0211m/s

Answer:

The blade of sharpener is made up of iron. Iron is a magnetic material because of this pencil sharpener gets attracted by the poles of a magnet although the body is made up of plastic.

Answer: -10.08 m/s

Explanation:

Here we only need to analyze the vertical problem.

When the ball is in the air, the only force acting on it will be the gravitational force, this means that the acceleration of the ball, is equal to the gravitational acceleration, then:

a(t) = -9.8m/s^2

Where the negative sign is because gravity pulls the ball down.

To get the velocity equation we need to integrate over time, we get:

v(t) = (-9.8m/s^2)*t + v0

Where v0 is the initial vertical velocity, here it is v0 = 10.5 m/s

Then the velocity equation is:

v(t) =  (-9.8m/s^2)*t + 10.5 m/s

To get the position equation, we need to integrate again over time, we get:

p(t) = (1/2)*(-9.8m/s^2)*t^2 + (10.5 m/s)*t + p0

Where p0 is the initial position, we know that the ball is sent upward from the ground, so p0 = 0m

Then the position equation is:

p(t) = (1/2)*(-9.8m/s^2)*t^2 + (10.5 m/s)*t

Now we need to find the value of t such that the position is equal to zero (this means that the ball hits the ground again).

Then we need to solve:

p(t) = 0 =  (1/2)*(-9.8m/s^2)*t^2 + (10.5 m/s)*t

If we divide both sides by t, we get:

0 =   (1/2)*(-9.8m/s^2)*t + (10.5 m/s)

Now we can solve it:

(1/2)*(9.8m/s^2)*t = 10.5 m/s

t = (10.5 m/s)/((1/2)*(9.8m/s^2)) = 2.14 s

This means that after 2.14 seconds, the ball will hit the ground again.

The velocity of the ball when it hits the ground is equal to:

v(2.14s) = (-9.8m/s^2)*2.14s + 10.5 m/s = -10.08 m/s

Answer:

The desk will move to the left.

Explanation:

Since Manuel is exerting a force of 10 N to the right, and Lynn is exerting a force of 15 N to the left, it means that Lynn is exerting a force of 5 N more than Manuel, meaning that the desk will move to the left, the direction Lynn is pushing it too.

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Answer:

true

Explanation:

in a parallel circuit, the voltage is the same

Answer:

40,000N

Explanation:

Force = Acceleration × Mass

2000×20=40,000

Answer:

For every action there is an opposite reaction.

Explanation:

Answer:

7.55 g

Explanation:

Heat of fusion = 333kj/kg

Heat capacity, c = 4190 j/kg /k

Heat capacity in j/g /k = 0.4190

Let the Number of grams of ice that will melt = n

Number of grams * heat of fusion = heat capacity * temperature change

n * 0.333 = 0.419 * (6-0)

0.333n = 2.514

n = 2.514 / 0.333

n = 7.5495

n = 7.55 gram

Hence, the number of gram of ice that will melt is 7.55 grams

Answer:

500 J

Explanation:

formula of Energy is: E=mass*height*g, where g≈10 (m/s²).

according to the formula above: E=10*5*10≈500 (J)

Explanation:

(i) The density bottle must be held by the neck to avoid expansion. (ii). The outside must be wiped clean. (iii).

Answer:

Explanation: