A boat travels 28 m while it reduces its velocity from 27.5 m/s to 14.5m/s. What is the boat’s acceleration while it travels that distance?

The near point of a human eye is about a distance of 25 cm.

The closest distance that an object may be viewed clearly without straining is known as the near point of the eye.

This distance (the shortest at which a distinct image may be seen) is 25 cm for a typical human eye.

The closest point within the accommodation range of the eye at which an object may be positioned while still forming a focused picture on the retina is also referred to as the near point.

In order to focus on an item at the average near point distance, a person with hyperopia must have a near point that is further away than the typical near point for someone of their age.

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Answer:

42.5m

Explanation:

How far does sound travel in 0.25 s at a speed of 340 m/s?

d = v*t = 85 m

Sound travels from her hands to the wall, bounces off and comes back.

So the distance traveled is twice the length from the wall.

d = 2L

L = d/2

L = 42.5 m.

Answer:

Its the sum of the potential energy and the kinetic energy

Answer: the angular velocity of a particle at the Earth's surface is approximately 7.27 x 10^-5 rad/s, and the linear velocity of the particle is approximately 464.1 m/s.

Explanation:

The area the radius vector will sweep is 0.889A

According to Kepler's second law, the radius vector sweeps out equal areas in equal times.

Let A = area and t = time period,

According to Kepler's law, A/t = constant

So, A₁/t₁ = A₂/t₂ where A₁ = area the radius vector sweeps at slowest orbital speed = A, t₁ = time period at slowest orbital speed = 45 days, A₂ = area the radius vector sweeps at fastest orbital speed, t₂ = time period at fastest orbital speed = 40 days.

Making A₂ subject of the formula, we have

A₂ = A₁t₂/t₁

Substituting the values of the variables into the equation, we have

A₂ = A₁t₂/t₁

A₂ = A × 40 days/45 days

A₂ = A × 40/45

A₂ = A × 8/9

A₂ = A × 0.889

A₂ = 0.889A

So, the area the radius vector will sweep is 0.889A

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Answer:

less than A

Explanation:

The temperature of waste heat exhausted is  483.83 °C.

A Carnot heat engine is a heat engine that operates at the Carnot cycle. The simple version of this engine turned into evolved by Nicolas Léonard Sadi Carnot in 1824.

The Carnot engine is a theoretical thermodynamic cycle proposed by means of Leonard Carnot. It estimates the maximum possible efficiency that a heat engine all through the conversion manner of heat into work and, conversely, operating between reservoirs can possess.

calculation:-

1 kcal = 4.186 k J.

So the engine efficiency eta = 510/930 × 4.186 = 0.13305

T hot = 600 + 273.15 = 873.15 K

From the Carnot equation = (T hot-T cold) /T Hot,

so

T cold = T hot(1-eta)

= 873.15 × (1-0.13305) =756.98 K

= 756.98  K = 483.83 °C

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Answer: 14.5 N

Explanation:   NEED SCRATCH PAPER: A flower pot weighing 42.0 N (newtons) is hung above a window by three ropes, each making an angle of 15.0 degrees with the vertical. What is the tension in each rope supporting the flower pot?

✓ 14.5 N

found it on the internet?

Answer:

a=25000 kg•m/s

b=1200 kg•m/s

c=what force?

Explanation:

for question a you multiply the mass which is 1000kg with velocity 25m/s.

for question b you multiply the force 60n with time 20s

Answer:

96,000joules!!!

Explanation:

Hope this helps u

The gravitational force on planet X is one-eight (¹/₈) of the magnitude of gravitational force on planet Y.

The gravitational force on each planet is directly proportional to the product of mass of the planet and the tennis ball and inversely proportional to the square of the radius of the planets.

F = GmM/r²

where;

The gravitational force on planet X is written as;

F_X = Gm(mt) / r²

where;

The gravitational force on planet Y is written as;

F_y = G(½m)(mt) / (¼r)²

F_y = ½(Gm(mt) / (¹/₁₆ r²)

F_y = (16 Gm mt)/(2r²)

F_y = 8(G m(mt) ) / r²

F_y = 8(F_X)

F_X = ¹/₈(F_Y)

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As per the given scenario, in this case, the coefficient of friction () is half and the coefficient of restitution (e) is zero.

Identify the body's starting velocity:

We may use the equation of motion to get the body's initial velocity (u)

\(v^2 = u^2 + 2as\)

\(0 = u^2 + 2(-9.8)m/s^2 * h\)

\(u^2 = 19.6h\)

u = √(19.6h)

The body's initial velocity (u) and initial relative velocity (u_rel) are the same.

The body's horizontal velocity immediately following the collision, which is zero, is the final relative velocity (v_rel).

\(e = v_{rel }/ u_{rel}\)

e = 0 / u_rel = 0 / u

Now, one can investigate the forces affecting the body: When a body is on an inclined plane.

There are two main forces at work on it: the frictional force that prevents the body from moving and the gravitational force that pulls it downward (mg).

The gravitational force has two components that act perpendicular to and parallel to the inclined plane, respectively: m*g*cos(45°) and m*g*sin(45°).

Determine the conditions for the body to stop:

μ * N = m * g * sin(45°)

μ * (m * g * cos(45°)) = m * g * sin(45°)

μ * cos(45°) = sin(45°)

(1/2) * cos(45°) = sin(45°)

Simplifying further, we have:

√2 / 4 = √2 / 2

Thus, the body will come to rest following the collision if the equation is valid.

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Answer:

 m₂ = 4 kg

Explanation:

The moment of inertia is defined by

         I = ∫ r² dm

for bodies with high symmetry it is tabulated, for a spherical shell

        I = 2/3 m r²

in this case the first sphere has a radius of r₁ = 2m and a mass of m₁ = 1 kg, the second sphere has a radius r₂ = 1m.

They ask what is the masses of the second spherical shell so that the moment of inertia of the two is the same.

        I₁ = ⅔ m₁ r₁²

        I₂ = ⅔ m₂ r₂²

They ask that the two moments have been equal

        I₁ = I₂

        ⅔ m₁ r₁² = ⅔ m₂ r₂²

         m₂ = (r₁ / r₂) ² m₁

let's calculate

         m₂ = (2/1) ² 1

         m₂ = 4 kg

Answer:

A

Explanation:

Hopefully this helps.

Answer: Stopwatch

Explanation: A stopwatch would be the best technology tool available to help provide feedback to the runner so that she doesn't "burn out" too fast at the beginning of a gruelling competition. A stopwatch can help the runner measure her pace and ensure that she runs at a steady, consistent pace throughout the race. Additionally, a stopwatch can be used to track the runner's split times and provide her with detailed feedback on her performance.

PJ likes to ride his bike around the block. if he rides out of his house west, the sidewalk circles his block and brings him back to his doorstep 0.35 miles later, then his displacement would be zero and the distance covered by him would be 0.35 miles.

Displacement is a vector quantity. This indicates that it has both a direction and a magnitude and that it is visually represented as an arrow that points from the starting position to the ending position.

As given in the problem, PJ likes to ride his bike around the block. if he rides out of his house west, the sidewalk circles his block and brings him back to his doorstep 0.35 miles later,

Distance = Total path length covered by the PJ

               = 0.35 miles

Displacement = Final position - initial position

                       = 0

Thus, the total distance covered would be 0.35 miles and the displacement would be zero.

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Answer:

2

Explanation:

Answer:

bc of their paw pads, they don't get the traction they need in order to be able to get a firm grip to push off of on the table for each bound

Explanation:

Answer:

1⁺ ion

Explanation:

Metals in the first group on the periodic table will prefer to form 1⁺ ion. This is because the 1 valence electron in their orbital.

Most metals are electropositive and would prefer to lose electrons than to gain it.

Like all metals, the group 1 elements called the alkali metals would prefer to lose and electron.

On losing an electron the number of protons is then greater than the number of electrons. This leaves a net positive charge.

Answer:

Increases

Explanation:

Due to an increase in temperature, molecules within the medium will vibrate more vigorously, meaning that the rate of chemical reactions generally increases with temperature due to an increase in kinetic energy. Because sound is a form of kinetic energy, it is safe to assume that the speed of sound waves increases with temperature.

Answer:

A- increases because The particles bump into each other more often.

Explanation:

Just took the test

The equation that relates the forces acting on person to the acceleration of the person in elevator is as : N - mg = ma

An influence that causes the motion of object with mass to change it's velocity is called force.

The equation that relates forces acting on the person to acceleration of the person in elevator is: N - mg = ma

N is normal force exerted on the person by the elevator floor, m is mass of the person, g is acceleration due to gravity, and a is acceleration of the elevator.

This equation is derived from Newton's second law of motion, which states that net force acting on object is equal to its mass times its acceleration. In this case, net force acting on the person is the difference between normal force N and force of gravity mg, which is equal to ma, the product of person's mass and acceleration of the elevator.

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Explanation:(2.5kg) (7.5) m/s +70 kg(0) =(2.5kg +70 kg (v3) 18. 75 =72.5 =v3

1) The electric potential energy of the block-spring system is approximately 22.03 J.

2) The block's speed after leaving the spring is approximately 2.165 m/s.

1) To calculate the electric potential energy of the block-spring system, we need to consider the potential energy stored in the spring when it is compressed. The formula for the potential energy stored in a spring is given by:

\(PE =\) \((1/2) k x^2\)

where PE is the potential energy, k is the spring constant, and x is the displacement (compression) of the spring.

Given that the spring constant, k, is 785 N/m and the displacement, x, is 0.0750 m, we can substitute these values into the formula:

\(PE =\) \((1/2) * 785 * (0.0750)^2\) = 22.03125 J

2) When the block is released, it will experience a conversion of potential energy stored in the spring into kinetic energy as it accelerates. Since the surface is frictionless, there are no dissipative forces, and the conservation of mechanical energy can be applied.

The potential energy stored in the spring is given by the equation:

\(PE =\) \((1/2) mv^2\)

where m is the mass of the block and v is its velocity.

By equating the initial potential energy to the final kinetic energy, we can solve for the velocity of the block:

\((1/2) k x^2 = (1/2) mv^2\)

Simplifying the equation:

\(v^2 = k/m * x^2\)

\(v = sqrt(k/m) * x\)

Substituting the given values:

v = sqrt(785/2.8) * 0.0750 ≈ 2.165 m/s

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Option D is correct: The rod gained electrons.

EXPLANATION WHY ABC INCORRECT

Options A and C are incorrect because they both suggest that the rod has lost or gained protons, which is not possible through rubbing. Protons are tightly bound within the atomic nucleus and cannot be transferred by rubbing. Similarly, option B is incorrect because it suggests that the rod has lost electrons, whereas the question explicitly states that the rod has become positively charged, which can only happen if it gains positive charge or loses negative charge.

A plastic rod becomes positively charged when rubbed against a cloth due to the loss of negatively charged electrons. The rod does not lose or gain protons.

When a plastic rod is rubbed against a cloth, it becomes positively charged due to the transfer of electrons from the rod to the cloth. In terms of the given choices, B. The rod lost electrons is the correct statement. Electrons have a negative charge, therefore when they are removed from an object, it becomes positively charged. Contrary to some misconceptions, protons do not transfer during this process because they reside in the nucleus of an atom, which is a comparatively stable and inaccessible region.

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Answer: 0.435 m

Explanation:

Given

mass m=20 kg

initial speed u=2 m/s

coefficient of kinetic friction \(\mu_k=0.3\)

deceleration which opposes the motion is given by

\(\Rightarrow a=g\sin \theta+\mu_kg\cos \theta\\\Rightarrow a=g(\sin \theta +\mu_k\cos \theta)\)

\(\Rightarrow a=9.8(\sin 10^{\circ}+0.3\times \cos 10^{\circ})\\\Rightarrow a=4.59\ m/s^2\)

using \(v^2-u^2=2as\)

\(\Rightarrow s=\dfrac{2^2}{2\times 4.59}=0.435\ m\)

Wendy must stand 1.19m to the left of the edge of the roof so that the orange just barely passes over her head.

Bob's orange will travel down the slanted roof with a velocity of 4.47 m/s, and it will hit the ground 3.0 m below the edge of the roof. The height of the orange above the ground at the edge of the roof is 1.8 m, and the angle of the roof is 28.5° relative to the horizontal.

To calculate the distance Ar that Wendy has to stand from the edge of the roof, we must first calculate the time it takes for the orange to reach the ground. Using the equation for the vertical displacement of an object with an initial velocity, we can solve for the time, t:

d = v*t - (1/2)*g*t^2

0 = 4.47*t - (1/2)*9.8*t^2

t = 0.938s

Next, we must calculate the horizontal displacement of the orange from the time, t. Using the equation for the horizontal displacement of an object with an initial velocity and a constant acceleration we can solve for the displacement:

x = v*t + (1/2)*a*t^2

x = 4.47*0.938 + (1/2)*0*0.938^2

x = 4.19m

To calculate the distance Ar that Wendy must stand from the edge of the roof, we must subtract the horizontal displacement of the orange from the height of the edge of the roof:

Ar = 3.0 - 4.19

Ar = -1.19m

Therefore, Wendy must stand 1.19m to the left of the edge of the roof so that the orange just barely passes over her head.

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1. The force between the two charges is 1.78 × 10⁻⁵ pounds, with opposite signs indicating attraction between the charges.

2. The resistance of 10 gauge aluminum wire over a 40 ft distance would be 0.506 ohms.

3. The cost of electricity from the automobile battery is 38.6 cents per kWh.

4. The current that would be carried through the body is 0.8 mA if dry.

1. The force between two point charges can be calculated using Coulomb's law, which states that the force is proportional to the product of the charges and inversely proportional to the square of the distance between them.

Using the values given, the force can be calculated as F = (k * q1 * q2) / r², where k is Coulomb's constant, q1 and q2 are the charges, and r is the distance between them. Plugging in the values, the force can be calculated as 1.78 × 10⁻⁵ pounds, with opposite signs indicating attraction between the charges.

2. The resistance of a wire is determined by its length, cross-sectional area, and resistivity. The resistivity of aluminum is higher than that of copper, so a larger cross-sectional area is required to achieve the same resistance. Using the gauge size conversion chart, 10 gauge aluminum wire has a cross-sectional area of 5.26 mm², which is approximately 83% of the cross-sectional area of 12 gauge copper wire.

Thus, the resistance of 10 gauge aluminum wire over a 40 ft distance can be calculated as R = (rho * L) / A, where rho is the resistivity of aluminum, L is the length, and A is the cross-sectional area. Plugging in the values, the resistance can be calculated as 0.506 ohms.

3. To calculate the cost of electricity per kWh, the total cost and the total amount of energy supplied must be known. Since the battery supplies 12 V and 51 A for one hour, the total energy supplied can be calculated as E = V * I * t, where V is the voltage, I is the current, and t is the time.

Plugging in the values, the total energy supplied can be calculated as 612 watt-hours (Wh). Since one kWh is equal to 1000 Wh, the total energy supplied can be converted to 0.612 kWh. Dividing the total cost by the total energy supplied gives the cost per kWh, which is 38.6 cents.

4. The current through the body can be calculated using Ohm's law, which states that current is equal to voltage divided by resistance. Using the values given, the resistance can be either 100,000 ohms or 300 ohms depending on whether the skin is dry or wet.

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Answer:

Below

Explanation:

1) Gravity force =~  m1 m2 / r^2     now   half the radius

                         = m1 m2 / ( 1/2r)^2 = 1/4  m1m2/r^2     so the force will be 1/4

                                            625 * 1/4 = 156.25 N

2)  mass does not change..it is a measure of the amount of mass an object has  .... it will still be 95 kg

The amount of work done on the toboggan by the tension force of 105 N with a rope directed 32° above the snow is 3.12 KJ

W = F d cos θ

W = Work done

F = Force

d = Distance

θ = Angle between force and displacement vector

d = 35 m

F = 105 N

θ = 32°

W = 105 * 35 * cos 35°

W = 105 * 35 * 0.85

W = 3123.75 N m

W = 3.12 KJ

Work done is energy transferred to make an object move to a distance. Its unit is Joules which is denoted as J. It is the amount of work done by a force of 1 Newton to move a distance of 1 meter.

Therefore, the amount of work done on the toboggan by the tension force is 3.12 KJ

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It is possible to study the connection between motivation, rewards, and production from a variety of angles, including those of economics, psychology, and physics.

Because producers are motivated to satisfy consumer demand, free markets offer a larger variety of commodities than any other system. What is created is under the control of the consumer.

In theory, free markets work best because supply and demand are efficiently distributed by an invisible hand. Yet, in practise, open markets are prone to manipulation, false information, and imbalances of power and knowledge, which also contribute to wealth disparity.

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