A contestant in a winter games event pushes a 51.0 kg block of ice across a frozen lake at 25 degrees clockwise from the x-axes.The coefficient of static friction is 0.1 and the coefficient of kinetic friction is 0.03.(a) Calculate the minimum force F (in N) he must exert to get the block moving. (b) What is its acceleration (in m/s2) once it starts to move, if that force is maintained?

Answer:

proton in a material all spin in the opposite direction

A physics book slides off a horizontal tabletop with a speed of 1.10 m/s. It strikes the floor in 0.480 s. The height of the tabletop above the floor is 0.264 m.

Given data:

Speed = 1.10 m/s

Time taken to strike the floor = 0.480 s

We are supposed to find the height of the tabletop above the floor in meters.

We can use the formula of distance to calculate the height of the tabletop above the floor.

We also need to make use of kinematic equations to find out the distance fallen by the book.

Let us first calculate the distance fallen by the book.

Let the height of the table be ‘h’.

From the kinematic equations of motion, we know thats = ut + 1/2 at²Here, u = 1.10 m/s, a = acceleration due to gravity = 9.8 m/s², t = 0.480 s

Putting these values in the above equation, we get:s = 1.10 × 0.480 + 1/2 × 9.8 × (0.480)² = 0.264 m

Now, we can find the height of the tabletop using the formula of distance.d = h + sHere, d = distance fallen by the book = h, s = 0.264 m

Putting these values in the above equation, we get: h = d = s = 0.264 m

Therefore, the height of the tabletop above the floor is 0.264 m.

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Answer:

Voltage

Explanation:

The term to describe pressure in electricity terms is 'voltage'. It's measured in volts using a voltmeter.

Explanation:

hey I'm not sure but I think the answer is the gravitational force will

increase 16 times.

Answer:

D

Explanation:

The formula for the gravitation force is

Fg = G * m1 * m1 / r^2

You have to realize that nothing but the mass changes and that will make Fg change.

So G remains constant.

r remains constant

somehow m1 and m2 between them increase by a factor of 4. It does not tell how that increase takes place. It just does.

So m1 could become 4*m1

or

M2 could become 4*m2

or

m1 * m2 becomes 4 * m1 * m2

or

m1 and m2 could both increase by a factor of 2

or

any number of other combinations are possible. The point is that m1 * m2 must somehow between them make the new mass = 4 m1 * m2

Then the force Fg will increase by a factor of F. The answer is D

Answer:

c because first is totally wrong and second one is about two football fields and d is also totally wrong because it is a partnership of at least 10 countrie so.i think č is correct answer.

Answer:

1.332 N

Explanation:

Net Force = Mass x Acceleration
1.2 x 1.11 = 1.332 N

I'm so sorry if I'm wrong.

Answer:

10m above initial height

Explanation:

let acceleration due to gravity = 9.8 m/s/s

v final = v initial - time • gravity

0 = 14m/s - t • 9.8m/s/s

t = 1.43 seconds to reach max height

distance = 1/2 • acceleration • time^2

distance = 1/2 • 9.8 • 1.43^2

distance = 10 meters above initial height

Answer:

c

Explanation:

Answer:

c

Explanation:

csCA

The process of making alloys involves the use of pure metals to remove impurities and then combining the purified metals with other components to create a desired alloy with specific properties.

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Answer: False

explanation: because Total momentum is conserved only if the collision can be considered isolated from the influence of net external forces

Answer:

put the full thin g

Explanation:

Answer:

\(N(t)=41\, \,e^{-0.065*t}\)

Explanation:

We use exponential decay for this example, considering that the initial amount of substance is 41 grams, and the continuous rate of decay is 6.5%:

\(N(t)=N_0\, \,e^{-k*t}\\N(t)=41\, \,e^{-0.065*t}\)

where N(t) is the Krypton's mass of the sample in grams, in terms of number of years "t"

Using the exponential distribution concept, the expression which models the function can be expressed thus : \( N(t) = 41 e^{0.065t} \)

Given the Parameters :

Using the exponential decay relation :

Hence, following the exponential Decay relation ; the function which models the mass of krypton based on the initial amount, decay rate and time can be expressed thus :

Therefore, the function which models the scenario is \( N(t) = 41 e^{0.065t} \)

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Answer:50-90=60m/s

Explanation:

u subtract

The models that predict galaxies should be getting farther apart now are; accelerating model, critical model,- and coasting model.

Observations show that the expansion of the universe is accelerating, such that the velocity at which a distant galaxy recedes from the observer is continuously increasing with time.

The accelerating model of the galaxies predicts that galaxies should be getting farther apart now.

From the model presented in the graph critical model of the galaxies also predict that galaxies should be getting farther apart now.

Another model that predicts that galaxies should be getting farther apart now is coasting model.

These models can be seen in the graph as they increase proportional with time. That is the distance between galaxies increase with increase in time measured in years.

Thus, we can conclude that there  models ( accelerating, critical and coasting model) predicts the relative position of the galaxies from us.

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Answer:

In a material, the magnetic behavior depends on the alignment of magnetic moments of the atoms. Magnetic moments are generated by the motion of the electrons in the atoms. When the magnetic moments of atoms in a material are aligned in a specific pattern, it creates a magnetic field which results in the material being magnetic.

In many materials, the magnetic behavior arises due to the alignment of magnetic domains, which are regions of atoms with magnetic moments aligned in the same direction. When many domains with aligned magnetic moments are present in a material, the material becomes magnetic.

The magnetic behavior of a material depends on the number of electrons and the arrangement of those electrons in the atoms. In particular, for an atom to have a magnetic moment, it must have unpaired electrons, meaning electrons that are not paired with another electron with the opposite spin. When these unpaired electrons in the atoms are aligned, they generate a magnetic moment. If all electrons are paired, there will not be a net magnetic moment, so the material will not be magnetic.

So, in summary, the magnetic behavior of a material is determined by the alignment of magnetic moments of atoms. When the magnetic moments of many atoms in a material align in the same direction, it creates a magnetic field, leading to a material being magnetic. This alignment is usually present in magnetic domains consisting of atoms with unpaired electrons.

The time taken for the ball to reach its maximum height is 1 second.

To calculate the time taken for the ball to reach its maximum height, we can use the kinematic equation for vertical motion. The equation is:

v = u + at

Where:

v = final velocity

u = initial velocity

a = acceleration

t = time

In this case, the ball is thrown vertically upwards, so the initial velocity (u) is 10 m/s (considering upwards as positive) and the acceleration (a) is -10 m/s² (negative because it opposes the motion).

The final velocity (v) at the maximum height will be zero because the ball momentarily comes to a stop before reversing its direction. Therefore, we can rewrite the equation as:

0 = 10 - 10t

Simplifying the equation, we get:

10t = 10

Dividing both sides by 10, we find:

t = 1 second

Therefore, the time taken for the ball to reach its maximum height is 1 second.

During this time, the ball covers the distance required to reach the maximum height, overcoming the gravitational acceleration. After reaching the maximum height, it will start to descend towards the ground due to the gravitational pull.

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Answer:

Heat flow is the movement of heat.

Explanation:

Heat flows in solids by conduction, which occurs when two objects in contact with each other transfer heat between them. That happens because the molecules hit each other, and the faster moving molecules in the hot object spread that energy into the cooler object

Credit to, https://study.com/academy/lesson/heat-flow-in-solids-fluids.html

Answer:

12.5

Explanation:

first, v=d/t

      v=25/2

      v=12.5

The final velocity of the ball is 44.6 m/s.

The given parameters;

The velocity of the ball increases as the ball moves downward and it will become maximum before the ball hits the ground.

This velocity is known as the final velocity of the ball.

The final velocity of the ball is calculated as follows;

v = u + gt

where;

v = 25 + 9.8(2)

v = 44.6 m/s

Thus, the final velocity of the ball is 44.6 m/s.

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Answer:

Newton's first law states that every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force. This tendency to resist changes in a state of motion is inertia.

Explanation:

The input to the power station is 5x10^9 W. This means that the power station requires an input of 5x10^9 watts to produce an electrical power output of 1.9x10^9 watts with an efficiency of 38%.

The efficiency of a power station is defined as the ratio of its output power to input power. Therefore, we can use the efficiency and the electrical power output of the power station to calculate its input power as follows:

Efficiency = Output power / Input power

Solving for input power, we get:

Input power = Output power / Efficiency

Substituting the given values, we get:

Input power = 1.9x10^9 W / 0.38

Input power = 5x10^9 W (to two significant figures)

The rest of the input power is lost as heat due to inefficiencies in the power generation process.

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(PLEASE GIVE BRIANLIEST)

The average speed is not equal to the sum of the speeds divided by 2 because the car takes different times to cover the distance while going up and coming down the hill.

The average speed can be calculated as the total distance covered divided by the total time taken. As the speeds are constant, we can use the formula:

distance = speed * time

Let the distance traveled be "d". The time taken to go up the hill is "t1" and the time taken to come down is "t2".

d = 35 * t1 = 69 * t2

The total time taken for the round trip is t1 + t2.

The average speed is given by:

average speed = d / (t1 + t2) = d / (d/35 + d/69)

So the average speed can be calculated as follows:

average speed = d / (d/35 + d/69) = d * (35 + 69) / (35 * 69) = 104 / 2445 = 8 / 205 km/h

The net angular momentum about point O is L = 9.51 kg⋅m²/s (magnitude).

Angular momentum is a fundamental concept in physics that describes the rotational motion of an object. It is a vector quantity that is defined as the cross product of the position vector and the linear momentum vector of an object with respect to a chosen point or axis. In other words, angular momentum is a measure of how much a rotating object "wants" to keep rotating, and it depends on the mass, speed, and distance of the object from the axis of rotation.

To find the net angular momentum about point O, we need to calculate the angular momentum for each particle and add them together. The direction of the angular momentum is perpendicular to both the position vector and the linear momentum vector, so we can use the right-hand rule to determine the direction.

For particle P₁:

r₁ = 1.4 m (in the radial direction from O)

p₁ = 7.4 kg × 2.2 m/s = 16.28 kg⋅m/s (tangential to the circle)

Using the right-hand rule, we can see that the direction of the angular momentum for particle P₁ is out of the plane of the page (in the +z direction).

For particle P₂:

r₂ = 2.8 m (in the radial direction from O)

p₂ = 3.1 kg × 4.1 m/s = 12.71 kg⋅m/s (tangential to the circle)

Using the right-hand rule, we can see that the direction of the angular momentum for particle P₂ is into the plane of the page (in the -z direction).

Therefore, the net angular momentum about point O is:

L = r₁ × p₁ + r₂ × p₂

L = (1.4 m × 16.28 kg⋅m/s) + (2.8 m × -12.71 kg⋅m/s)

L = 9.51 kg⋅m²/s (magnitude)

(b) The direction of the net angular momentum is perpendicular to the plane formed by the position vectors and the linear momentum vectors. From the calculation above, we can see that the net angular momentum is in the +z direction, which is perpendicular to the xy plane. Therefore, the direction of the net angular momentum is up, out of the plane of the page.

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Answer: The mass of the second sphere is 8.76 kg

Explanation:

The equation for a perfectly inelastic collision follows:

\(m_1u_1+m_2u_2=(m_1+m_2)v\)

where,

\(m_1\text{ and }u_1\) are the mass and initial velocity of first sphere

\(m_2\text{ and }u_2\) are the mass and initial velocity of second sphere

v = final velocity of the system

We are given:

\(m_1=4.38kg\\u_2=0m/s\\v=\frac{u_1}{3}\)

Rearranging the above equation, we get:

\(m_1u_1-m_1v=m_2v\\\\m_2=m_1\frac{u_1-v}{v}\\\\m_2=m_1(\frac{u_1}{v}-1)\)

Plugging values in the above equation, we get:

\(m_2=4.38(\frac{3u_1}{u_1}-1)\\\\m_2=(4.38\times 2)=8.76kg\)

Hence, the mass of the second sphere is 8.76 kg

Explanation:

speed=distance/time

=50/10

=5 m/s

Speed ​​is defined as the rate of position in a given amount of time. Hence, the speed covered by the bird is 5m/s.

The speed of an object is defined as the magnitude of change of its position with time or the magnitude of change of its position per unit time. Speed ​​is a scalar quantity because it has only magnitude, not direction.

Speed is expressed as:

Speed= Distance/ Time taken

s=d/t

Where, s= speed

d= distance travelled

t= time taken

Given,

Distance travelled= 50 m

Time take= 10 sec

Speed= 50/10= 5m/s

Thus, Speed ​​is defined as the rate of position in a given amount of time. Hence, the speed covered by the bird is 5m/s.

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The maximum compression in the spring is 0.06883 meters.

Given to us,

mass of bullet, \(m= 16.2\ grams\)

velocity of bullet, \(v= 850\ meter/second\)

mass of the block, \(m_2= 40\ kilograms\)

velocity of block, \(v_2= 0\ meter/second\)

spring constant, \(k = 1000\ Newton/meter\)

Combined mass after collision,

\(\begin{aligned}M&= m_1+m_2\\&= 40.0162\ Kilograms\end{aligned}\)

Using the momentum conservation equation, to find out final velocity of the system(bullet and block combined)

\(m_1v_1+m_2v_2= MV\\\)

\(0.0162\times 850+40\times 0 = 40.0162\times V\\V= 0.3441 meter/sec\)

Now using the Conservation of Energy (Kinetic energy of the system will be equal to potential energy in the spring), to find out the displacement of the spring \((x)\)

\(\frac{1}{2}kx^2 = \frac{1}{2}MV^2\\\\\frac{1}{2}\times 1000\times x^2= \frac{1}{2} \times40.0162\times0.3441^2\\\\x^2= 0.004738\\\\x= 0.06883\ meters\)

Hence, the maximum compression in the spring is 0.06883 meters.

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Answer:

energy cannot be created or destroyed, although it can be changed from one form to another. KE + PE = constant.

Explanation:

please make my answer as brainelist

Answer:

You could put a pressure stick against the pressure and see the pressure or estimate it from the power its coming out.

Explanation:

Answer:

"...Physical field that surrounds each electric charge and exerts force on all other charges in the field, either attracting or repelling them..." According to the Wikipedia

Explanation:

"Electric fields originate from electric charges, or from time-varying magnetic fields..." by Wikipedia

Each location in space in which a charge exists in any form can be considered to have an electric field attached to it.

Each location in space has an electric field associated with it when there is charge present in just about any form. E, often known as electric field strength, electric field intensity, or just the electric field, is a mathematical constant that expresses the strength and direction of an electric field.

To predict what would happen on electric charges nearby a specific point, one only needs to be aware of the magnitude of the electromagnetic current there, without having any precise knowledge of what generated the field.

Instead of viewing the electrostatic charge as the effect of 2 electrostatic force coming into contact with each other directly, one charge is thought of as the origin of an electromagnetic current that radiates outward into the surrounding space.

The force acting on a new charge in this area is then thought of as the result of a real contact between the electromagnetic field and the separate charge.

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The perimeter the sphere is the extreme to which they can go. If ... But what happens if a positively charged object is touched to a neutral object? ... The metal sphere loses electrons.