In the sport of billiards, event organizers often remove one of the rails on a pool table to allow players to measure the speed of their break shots (the opening shot of a game in which the player strikes a ball with his pool cue).
The top of a pool table is a height ℎ=2.75 ft from the floor. If a player's ball lands a distance =16.50 ft from the table edge, what is her break shot speed 0?

The motorcycle had covered a distance of 16 meters in half the total time.

a) To calculate the acceleration, we can use the formula:

a = (v - u) / t

where a is the acceleration, v is the final velocity, u is the initial velocity (which is 0 since the motorcycle starts from rest), and t is the time.

Given:

u = 0 m/s (initial velocity)

v = ? (final velocity)

t = 4 s (time)

s = 64 m (distance)

Using the equation of motion:

s = ut + 1/2at^2

We can rearrange the equation to solve for acceleration:

a = 2s / t^2

a = 2(64) / (4)^2

a = 128 / 16

a = 8 m/s^2

Therefore, the acceleration of the motorcycle is 8 m/s^2.

b) To find the final velocity, we can use the formula:

v = u + at

v = 0 + (8)(4)

v = 32 m/s

Therefore, the final velocity of the motorcycle is 32 m/s.

c) To determine the time at which the motorcycle had covered half the total distance, we divide the total distance by 2 and use the formula:

s = ut + 1/2at^2

32 = 0 + 1/2(8)t^2

16 = 4t^2

t^2 = 4

t = 2 s

Therefore, the motorcycle had covered half the total distance at 2 seconds.

d) To calculate the distance covered in half the total time, we use the formula:

s = ut + 1/2at^2

s = 0 + 1/2(8)(2)^2

s = 0 + 1/2(8)(4)

s = 0 + 16

s = 16 m

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Answer:because the circuit will be fully complete

Explanation:

Answer:

the same stones distance will be condtant .

so option no E

In the circuit below, if switch K is closed, The first row of the table correctly represents what will happen to the readings of V1, V2, and V3.

Therefore option D is correct.

An electronic circuit is described as composing of individual electronic components, such as resistors, transistors, capacitors, inductors and diodes, connected by conductive wires or traces through which electric current can flow.

if switch K is closed, the current flows through V2 and increases it's voltage as they are connected in series, And then flows through V2 which decreases because of its parallel connection. On getting to V1, the voltage further decreases.

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Answer: The weight of the object is 29.4 N

Explanation:

To calculate the weight of the object, we use the equation:

\(W=m\times g\)

where,

m = mass of the object = 3 kg

g = acceleration due to gravity = \(9.8m/s^2\)

Putting values in above equation, we get:

\(W=3kg\times 9.8m/s^2\\\\W=29.4N\)

Hence, the weight of the object is 29.4 N

Answer:

360000

Explanation:

Answer:

360000 milliseconds

Explanation:

I have this remembered dont worry homie i got chu

Hi there!

Recall the equation for the magnetic field produced by a solenoid:

\(B = \mu_0 ni\)

B = Magnetic field (T)
n = number of turns per unit length (103 turns/m)

i = Current in solenoid (In this instance, changes with respect to time)

Using Faraday's Law:

\(\epsilon = -N\frac{d\Phi_B}{dt}\)

ε = Induced emf (V)
N = Number of loops in coil (15 turns)

\(\frac{d\Phi_B}{dt}\) = Change in magnetic flux with respect to time (Wb/s)

We know that magnetic flux is equal to:
\(\Phi_B = \oint B \cdot dA = B\cdot A\)

Since the cross-sectional area remains constant, we can take it out of the time-derivative. Since the current in the solenoid varies with time, we know that its magnetic field must also vary.

\(\frac{d\Phi_B}{dt} = A * \frac{dB}{dt}\)

Solving for dB/dt, since the solenoid's current is the only thing changing with respect to time:
\(\frac{dB}{dt} = \mu_0 n * \frac{di}{dt}\)

We must first differentiate I(t) using trig and chain derivative rules.

If:
\(f(x) = \alpha sin(\beta t)\\\\f'(x) = (\alpha * \beta) cos(\beta t)\)

Therefore:
\(\frac{di}{dt} = (5 * 120)cos(120t)\\\\\frac{di}{dt} = 600cos(120t)\)

So, dB/dt equals:

\(\frac{dB}{dt} = \mu_0 n\frac{di}{dt}\\\\\frac{dB}{dt} = (4\pi * 10^{-7})(103)(600cos(120t))\\\\\frac{dB}{dt} = 0.0777cos(120t)\)

Now, substituting this expression into the equation for Faraday's Law:
\(\epsilon = -N_{coil} * A * \frac{dB}{dt} \\\\\epsilon = -15 * \pi(0.02^2) * 0.0777cos(120t)\\\\\epsilon = \boxed{-0.001464cos(120t) \text { V}}\)

**For 'A', I used the cross-sectional area of the solenoid because there is no magnetic field produced by the solenoid in the exterior of its opening. Thus, the magnetic field remains confined to an area of A = π(0.02²) = 0.00126 m², which is the value used to calculate the magnetic flux rather than the cross-sectional area of the coil.

**Also, the (-) sign in front of the function of the induced emf simply shows how the induced E-field and consequentially emf opposes the change in the solenoid's current.

Assuming the particle is in free fall once it is shot up, its vertical velocity v at time t is

v = 30 m/s - g t

where g = 9.8 m/s² is the magnitude of the acceleration due to gravity, and its height y is given by

y = (30 m/s) t - 1/2 g t ²

(a) At its maximum height, the particle has 0 velocity, which occurs for

0 = 30 m/s - g t

t = (30 m/s) / g ≈ 3.06 s

at which point the particle's maximum height would be

y = (30 m/s) (3.06 s) - 1/2 g (3.06 s)² ≈ 45.9184 m ≈ 46 m

(b) It takes twice the time found in part (a) to return to 0 height, t ≈ 6.1 s.

(c) The particle falls 35 m below its starting point when

-35 m = (30 m/s) t - 1/2 g t ²

Solve for t to get a time of about t ≈ 7.1 s

Answer: the time for the car to drive directly south is determined as 7.15 s.

Explanation:

The time for the car to drive directly south is determined by applying the concept of slope.

slope = Δy/Δx

a = Δv/Δt

Δt = Δv/a

Δt = (26.8)/(3.75)

Δt = 7.15 s

Thus, the time for the car to drive directly south is determined as 7.15 s.

Answer:

Sedentary lifestyle is the lifestyle by which most physical activity is abandoned, performing activities that do not require energy consumption or large muscle movements on a large scale, such as using a computer, driving a car or playing video games.

Today, most young people have gradually turned towards sedentary lifestyles, mainly motivated by the increase in technological availability, and the extensive dependence generated on technology both to communicate with their peers (cell phones, social networks, etc. .) and for leisure time (video games, etc.).

Some ways to promote physical activity in young people and prevent sedentary lifestyle can be to create sports groups, where young people can establish social relationships without depending on networks or technological devices, or establish tasks of physical activity during study or work hours.

The block accelerates down the ramp due to the component of its weight that acts parallel to the ramp; this force has magnitude

(100 kg) g sin(26.6°) ≈ 438 N

(Note that the positive sign here means we take "down the ramp" to be the positive direction.)

Since the ramp is frictionless, this is the only force acting on the block in this direction. By Newton's second law, the block's acceleration is a such that

438 N ≈ (100 kg) a   ⇒   a ≈ 4.38 m/s²

The block accelerates uniformly, so that it attains a speed v as it moves 50 m such that

v² = 2a (50 m)

Solve for v :

v = √(2a (50 m)) ≈ 20.9 m/s

The minimum deceleration required to stop the car in 35 meters is 40000 m/s^2.

Deceleration is defined as  the decrease in speed as the body moves away from the starting point.

The minimum deceleration required can be calculated using the equation of motion:

d = v^2 / (2 * a)

where d is the distance, v is the initial velocity, and a is the acceleration.

Rearranging the equation to solve for a:

a = v^2 / (2 * d) = (3500 m/s)^2 / (2 * 35 m) = 40000 m/s^2

In conclusion, , the minimum deceleration required to stop the car in 35 meters is 40000 m/s^2.

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Answer:

Option C

Explanation:

C. Radiation.....

Answer:

heat travel through vacuum by radiation

RLLY?

Explanation:

ALSO

MY DAD ALWAYS TELLS ME THAT IF YOUR FEET ARE COLD THAT YOU NEED TO PUT A HAT ON?!?!?!?!?!

The time that was taken for the movement of the item is observed as 3 seconds.

The equations of motion describe the motion of objects in terms of their position, velocity, acceleration, and time.

For the equation;

v = u + at

This equation relates the final velocity (v) of an object to its initial velocity (u), acceleration (a), and time (t). If three of these variables are known, the equation can be rearranged to solve for the unknown variable.

We know that;

v = u - gt

We know that the object would come to rest after being thrown.

0 = 30 - 10t

-30 = - 10t

t = 3 seconds

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Answer:

A

Explanation:

Answer:

a = 7.84 m / s²

Explanation:

For this exercise let's use Newton's second law

          F - fr = m a

indicate that the force is F = 609.1 N and the friction force is fr = 107.9 N and is constant

         a = \(\frac{F - fr}{m}\)

let's calculate

          a = \(\frac{ 609.1 - 107.9 }{63.9}\)

          a = 7.84 m / s²

Answer:

salts do not conduct electricity. unless u try to dissociate its ions,it cannot.

metals are good conductors of electricity.

acids also conduct electricity if you dissociate them into ions.

Answer:

allows for efficient transport of materials

Explanation:

Living cells relatively have a small size, so small that a microscope is needed to see their structure. However, this small size is for their benefitting as it increases their surface area to volume ratio (SA:V).

A large surface area to volume ratio (SA:V) enables easy movement of molecules to and fro the cell membrane via the process of DIFFUSION. Therefore, having a small size allows for efficient transport of materials needed in the cell.

Answer:

The value is  \(f_1 = 828 \ Hz\)

Explanation:

From the question we are told that

    The speed is \(v = 25 \ m/s\)

     The speed of the ambulance is \(u = 35 \ m/ s\)

     The frequency of the siren is  \(f = 850 \ Hz\)

Generally from Doppler effect equation we have that

        \(f_1 = \frac{v_s - v }{ v_s + u } * f\)

Here \(v_s\) is the velocity of sound with the value  \(v_s = 343 \ m/s\)

  =>   \(f_1 = \frac{343 - 25 }{ 343 + 35 } * 850\)

  =>   \(f_1 = 828 \ Hz\)

Answer:

option 5

Explanation:

because all u do is have to add them up

A negative percent error occurs when there is a negative change in the measurement.

A negative percent error occurs when taking change in a particular measurement.

For example, let us obtain the change in the following measurement as shown below.

initial measurement = 150 units

final measurement = 100 units

Find the percentage change in the following measurement;

percentage change = ( final measurement - initial measurement ) / ( initial measurement ) x 100%

percentage change = ( 100 - 150 ) / 100 x 100 %

percentage change = -50 %

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The asthenosphere is a layer of the Earth's mantle that lies beneath the lithosphere and is involved in the movement of tectonic plates. At the three types of plate boundaries, different things happen to the asthenosphere due to the movement of the lithospheric plates.

At divergent boundaries, the lithospheric plates move away from each other, causing the asthenosphere to rise and melt, forming new crust. This is because the pressure on the asthenosphere decreases as the plates move apart, allowing it to melt and rise to the surface.

At convergent boundaries, where two lithospheric plates collide, the denser plate is forced beneath the other in a process called subduction. As the plate descends into the mantle, it causes the asthenosphere to deform and flow around it, creating friction and heat that can cause melting and volcanic activity.

At transform boundaries, where two lithospheric plates slide past each other, the asthenosphere is dragged along with the moving plates, causing deformation and the formation of faults.

Therefore, As for the hypothesis regarding the virtual lab demonstration, if the "plates" move towards each other, then they will collide and create a boundary similar to a convergent boundary, causing deformation and the potential for melting and volcanic activity. If the "plates" move away from each other, then they will create a boundary similar to a divergent boundary, causing the asthenosphere to rise and form new crust. If the "plates" move past each other, then they will create a boundary similar to a transform boundary, causing deformation and the formation of faults.

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The Ceres is (a).The largest asteroid identified to date is correct option.

With a diameter of around 590 miles (940 km), Ceres is the biggest asteroid between Mars and Jupiter. It is regarded as a minor planet, like Pluto, and was found in 1801 by Giuseppe Piazzi. Ceres is made of rock and ice, and due to its low density, it is likely that it contains a substantial amount of water ice inside.

The NASA Dawn spacecraft visited Ceres in 2015 and orbited the dwarf planet for more than three years, gathering useful information and taking stunning pictures of it.

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Answer:

BMI is a simple indicator of weight for height and can't differentiate between muscle mass and fat mass. So BMI tends to overestimate the health risk for adults with a high muscle mass, such as some athletes, and underestimate the risk for adults with a low muscle mass, as can occur with sedentary lifestyles.

Explanation:

Hope it is helpful...

A) The free-body diagram of the forces acting on the brick is attached.

B) The free-body diagram of the forces acting on the rubber cushion is attached.

C) The action and reaction forces of the entire brick–cushion–planet system has been enumerated below.

A) The brick has a Mass M placed on top of a rubber cushion of mass m.

This means that there will be a normal force acting acting upwards on the brick and also a gravitational force acting downward. These forces are denoted as;

Normal force of rubber cushion acting on brick = \(n_{cb}\)

Gravitational force acting on brick = Mg

Find attached the free body diagram.

B) The forces acting on the cushion will be;

Normal force of parking lot pavement on rubber cushion  = \(n_{pc}\)

Gravitational force of earth acting on cushion = mg

Force of brick acting on the rubber cushion = \(F_{bc}\)

C)  The action pairs of forces are;

i) Force; Normal force of rubber cushion acting on brick  = \(n_{cb}\)

Reaction Force; Force of brick acting on the rubber cushion = \(F_{bc}\)

ii) Action Force; Gravitational force acting on brick = Mg

Reaction; Gravitational force of brick acting on the earth

iii) Action Force; Normal force of parking lot pavement on rubber cushion = \(n_{pc}\)

Reaction; Force of rubber cushion on parking lot pavement

iv) Action Force; Gravitational force of earth acting on rubber cushion = mg

Reaction Force; Gravitational force of rubber cushion on the earth.

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The angular acceleration of the ball is approximately 800 rad/s².  the angular acceleration of the soccer ball is approximately -35.89 rad/s².

Question 1:

To find the angular acceleration of the ball rolling down the incline, we can use the following formula:

v = ω * r

where:

v is the linear velocity (2.0 m/s),

ω is the angular velocity, and

r is the radius of the ball (0.05 m).

We can also use the formula to relate linear and angular acceleration:

a = α * r

where:

a is the linear acceleration,

α is the angular acceleration, and

r is the radius of the ball (0.05 m).

Given that the ball rolls down the incline from rest, the initial angular velocity (ω0) is zero.

Using the equations above, we have:

2.0 m/s = ω * 0.05 m

ω = 2.0 m/s / 0.05 m

ω = 40 rad/s

Since the initial angular velocity is zero, the change in angular velocity (Δω) is equal to the final angular velocity (ω).

Using the equation a = α * r, we can rewrite it as α = a / r:

α = ω / r

α = 40 rad/s / 0.05 m

α ≈ 800 rad/s²

Question 2:

To calculate the time the soccer ball was rolling, we can use the formula:

t = d / v

where:

t is the time,

d is the distance traveled (25.0 m), and

v is the linear velocity (circumference of the ball times the angular velocity).

The circumference of the ball (C) can be calculated using the formula:

C = π * d

where:

d is the diameter of the ball (0.20 m).

Given that the ball has a diameter of 20 cm, the circumference is:

C = π * 0.20 m

C ≈ 0.628 m

Using the formula v = C * ω, we have:

v = 0.628 m * 15 rev/s

v ≈ 9.42 m/s

Substituting the values into the equation t = d / v, we find:

t = 25.0 m / 9.42 m/s

t ≈ 2.66 s

Therefore, the soccer ball was rolling for approximately 2.66 seconds.

To find the angular acceleration, we can use the formula:

α = Δω / t

Given that the initial angular velocity (ω0) is 15 rev/s and the final angular velocity (ω) is zero, the change in angular velocity (Δω) is:

Δω = ω - ω0

Δω = 0 - 15 rev/s

Δω = -15 rev/s

Converting the change in angular velocity to radians per second (rad/s):

Δω = -15 rev/s * (2π rad/rev)

Δω = -30π rad/s

Substituting the values into the formula α = Δω / t, we find:

α = (-30π rad/s) / 2.66 s

α ≈ -35.89 rad/s²

Note that the negative sign indicates a deceleration or slowing down of the rotation.

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Answer:

Gravity

Explanation:

The average velocity is the rate of change of the position of an object with respect to a change in time. On the other hand, the average speed for a given time interval is equal to the rate of the total distance traveled divided by the time interval in which that distance was traveled.

For example, suppose that a particle travels in a circular trajectory with a circumerence of 120km in one hour. Since it completes a circumference, the particle ends at the same point that it started. Then, the change in position is 0 at the end of the time interval of 1 hour, so the average velocity is 0.

Additionally, since the particle traveled a distance of 120km during that hour, then the average speed is 120km/h.