A ball is thrown from a top of a building of height 20m. If the initial velocity of the ball is 15m/s at 370 above the horizontal find, a) the velocity of the ball at 2s. b) the position at which the ball strike the ground.​

Answer:

The force they will exert on each other is 1.6*10⁻¹⁰ N

Explanation:

The electromagnetic force is the interaction that occurs between bodies that have an electric charge. When the charges are at rest, the interaction between them is called the electrostatic force. Depending on the sign of the interacting charges, the electrostatic force can be attractive or repulsive. The electrostatic interaction between charges of the same sign is repulsive, while the interaction between charges of the opposite sign is attractive.

Coulomb's law is used to calculate the electric force acting between two charges at rest. This force depends on the distance "r" between the electrons and the charge of both.

Coulomb's law is represented by:

\(F=k*\frac{q1*q2}{r^{2} }\)

where:

In this case:

Replacing:

\(F=9*10^{9} \frac{N*m^{2} }{C^{2} }*\frac{1.602*10^{-19} C*1.602*10^{-19} C}{(1.2*10^{-9} )^{2} }\)

and solving you get:

F=1.6*10⁻¹⁰ N

The force they will exert on each other is 1.6*10⁻¹⁰ N

Answer:

A.) Work function = 2.3 eV

B.) Max. K.E observed = 1.1 eV

Explanation:

A.) Millikan observed a maximum kinetic energy of 0.550 eV when electrons were ejected with 433.9-nm light. When light of 253.5 m was used, he observed a maximum kinetic energy of 2.57 eV. 

work function (f) is the minimum energy required to remove an electron from the surface of the material.

hf = Ø + K.E (maximum)

Where

h = Plank constant 6.63 x 10-34 J s

Ø = work function

hc/λ = Ø + K.E (max)

(6.63×10^-34 × 3×10^8)/433.9×10^-9 = Ø + 0.550 × 1.6×10^-19

4.58×10^-19 = Ø + 8.8×10^-20

Ø = 4.58×10^-19 - 8.8×10^-20

Ø = 3.7 × 10^-19 J

Converting Joule to eV

Ø = 3.7 × 10^-19/1.6×10^-19

Ø = 2.3 eV

B.) When light of wavelength 362.4 m is used

The maximum K.E observed = incident light K.E - (the work function).

Incident K.E = hf = hc/λ

Incident K.E =

(6.63×10^-34 × 3×10^8)/362.4

Incident K.E = 5.5 × 10^-28J

Let's convert joule to eV

Incident K.E = 5.5×10^-28/1.6×10^-19

Incident K.E = 3.4 × 10^-9

Max. K.E observed = 3.4 - 2.3

Max. K.E observed = 1.1 eV

Answer:

Wavelength

Explanation:

The graph of the velocity and the time  can be shown by option D.

We know that the movement of an object as it is falling under gravity would have a constant acceleration. The constant acceleration means that the velocity of the object is also held a constant.

We now have to look at the graphs as we have them here. The graph as it has been shown has the the velocity on the vertical axis and it has the time on the horizontal axis. The gradient of the slope is what we would refers to as the acceleration of the body.

We also need to recall that the acceleration has to be a constant since tje tow object would have to reach the ground at the same time if they are released from the same height at the same time.

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The powder takes the shape of a magnetic field.

Powder morphology is connected to the shape and size of powder particles and is strongly dependent on the manufacturing methods. For example, mechanical alloying/mechanical milling leads to unevenly shaped powder particles, while gas dissipation leads to spherically shaped particles.

Atomized metal powder particles come in two basic particle shapes: those that are almost superbly round called spherical, and those that have lopsided, rounded shapes, called spheroidal.

So we can conclude that Powders are a group of particles of different sizes.

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Pipe of constant radius, we can use Bernoulli's equation, which relates the pressure, velocity, and height of a fluid at two points in a flow system.the pressure of water in the pipe is approximately 105,142 Pa.

System refers to a collection of related components or parts that work together to achieve a specific goal or purpose. The concept of a system can be applied to a wide range of fields and disciplines, including science, engineering, economics, and social sciences.

In science, a system is often defined as a portion of the universe that is being studied or analyzed. This can include anything from a single atom or molecule to an entire ecosystem or planet. By defining the boundaries of a system, scientists can focus their attention on understanding the interactions and relationships between the various components within that system.

In engineering, a system refers to a collection of components that are designed to work together to perform a specific function or task. This can include everything from simple mechanical systems like gears and pulleys to complex electrical or computer systems.

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Answer:

Modernity is the belief in the freedom of the human being – natural and inalienable, as many philosophers presumed – and in the human capacity to reason combined with the intelligibility of the world, that is, its amenability to human reason

Explanation:

Answer:

B. 2 Hz

Explanation:

Given parameters:

Period of the wave  = 0.5Hz

Unknown:

Frequency of the wave  = ?

Solution:

Frequency is the number of waves that passes through a point.

Period is the time taken for a number of waves to pass through a point.

  Period is the inverse of frequency

  Frequency  = \(\frac{1}{t}\)  

 t is the period

  Frequency  = \(\frac{1}{0.5}\)  = 2Hz

Answer:2

Explanation:

Answer:

Explanation:

At the top of the arc, 3/4 of the acceleration of gravity is use to supply the necessary centripetal acceleration.

0.75g = ω²R

R = 0.75g/ω²

R = 0.75(9.81) / (0.15 rev/s)(2π rad/rev)²

R = 8.283006...

R = 8.28 m

During the 200-meter race, Michael Phelps moved at a speed of 1.75 metres per second.

More than any other swimmer in history, he won Olympic medals, world titles, US national titles, and set world records. Phelps has made it a priority to support the growth of swimming at all levels during his career. With a total of 28 medals, he is the most successful and decorated Olympian of all time.

Velocity = Distance / Time

In this case, the distance swum is 200 meters and the time taken is 1 minute and 54 seconds, or 114 seconds.

Velocity = 200 meters / 114 seconds

Velocity = 1.75 meters/second (rounded to two decimal places)

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The velocity of the large cart after the collision is approximately 0.0486 m/s in the opposite direction of its initial motion.

We can use the principle of conservation of momentum to find the speed of the large cart after the collision. According to this principle, the total momentum before the collision is equal to the total momentum after the collision.

The momentum (p) of an object is calculated by multiplying its mass (m) by its velocity (v). Therefore, the momentum of the small cart before the collision is:

p_small_before = (mass_small) * (velocity_small) = (0.300 kg) * (1.80 m/s) = 0.540 kg·m/s.

Since the large cart is at rest before the collision, its initial momentum is zero:

p_large_before = 0 kg·m/s.

After the collision, the small cart bounces back at a speed of 0.810 m/s. According to the law of conservation of momentum, the total momentum after the collision should equal the total momentum before the collision. Therefore, the momentum of the small cart after the collision is:

p_small_after = (mass_small) * (velocity_small_after) = (0.300 kg) * (-0.810 m/s) = -0.243 kg·m/s.

The momentum of the large cart after the collision is labeled p_large_after. Since the initial momentum of the large cart is zero and the momentum after the collision is determined by the momentum of the small cart, we can write:

p_large_after = -0.243 kg·m/s.

To find the speed of the large cart after the collision, we divide the momentum by its mass:

velocity_large_after = p_large_after / (mass_large) = (-0.243 kg·m/s) / (5.00 kg) = -0.0486 m/s.

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Answer:

The answer to your question is the number decreases by 4.

Explanation:

I hope this helps and have a great day!

The amount of damping force that allow shortest possible time is called​ critical damping of the system.

Critical damping is the threshold between overdamping and underdamping  at which the oscillator returns to the position of equilibrium quickly as possible.

Critical damping is frequently desired because such a system returns to and maintains equilibrium quickly. Furthermore, a constant force applied to a critically damped system moves the system to a new equilibrium position as quickly as possible without overshooting or oscillating around the new position.

Critical damping thus provides the rapid approach to zero amplitude for a damped oscillator.

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Answer:

Q = c * m * T     where c = specific heat, m = mass, T = temperature change

m = Q / (c * T) = 1000 J / (899 J / kg deg C * 1 deg C)

m = 1000 / 899 kg = 1.11 kg

Answer:

10.5 g/cm^3

Explanation:

d = mass/volume

V= 1cm x 3cm x 7cm = 21 cm^3

d = (220,5g) / (21cm^3)

d = 10.5 g / cm^3

Answer:

Follows are the difference to this question:

Explanation:

Dry friction:

Its force which prevents any solid surface moving over another flat substrate, and all substances which move compared to each other are often opposed by dry friction and could have the impact from either opposing movement or inducing movement throughout the body.  

drag due to fluid friction:

It also is known as Skin Friction Drag, which is indeed a drag created by a liquid's friction against the surface of the object which passes thru it. In fluid mechanics, drag sometimes alluded to as air resistance, a form of friction, or fluid resistance, another form of resistance is a force acting contrary to any entity's gravitational attraction about the external fluid.

From Hooke's law F=k×Δx, the force constant of springk= 1032 N/m. If object with m of 630g is hung on spring then force of the object acting on the spring is 6.17 N. A greater spring constant implies a tougher spring.

According to Hooke's law, the amount of force used to stretch an elastic item is proportional to that force. The object won't return if it is stretched very far, though.

The spring constant K is a constant that is always positive. As seen by the negative sign, the restoring force is acting in the opposite direction to that of the applied force.

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The magnitude of the potential difference between A and B is 195 V.

The potential of charge A is calculated as follows;

Va = kq/r

where;

Va = (9 x 10⁹ x 2 x 10⁻⁹) / (0.3)

Va = 60 Volts

Vb = kq/r

Vb = (9 x 10⁹ x -3 x 10⁻⁹) / (0.2)

Vb = -135 Volts

VAB = VB - VA

VAB = -135 V - 60 V

VAB = -195 V

Thus, the magnitude of the potential difference between A and B is 195 V.

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Answer:

75 cm/second.

Explanation:

Formula:

Walking speed = stride length / time per step

Walking speed = 90cm/time per step

                         = 90cm/1.2 seconds (a common estimate time per step)

                         = 75cm/second.

Explanation:

The range R of a projectile is given the equation

\(R = \dfrac{v_0^2}{g}\sin{2\theta}\)

The maximum range is achieved when \(\theta = 45°\) so our equation reduces to

\(R_{max} = \dfrac{v_0^2}{g}\)

We can solve for the initial velocity \(v_0\) as follows:

\(v_0^2 = gR_{max} \Rightarrow v_0 = \sqrt{gR_{max}}\)

or

\(v_0 = \sqrt{(9.8\:\text{m/s}^2)(9.5×10^6\:\text{m})}\)

\(\:\:\:\:\:\:\:=9.6×10^3\:\text{m/s}\)

To find the maximum altitude H reached by the missile, we can use the equation

\(v_y^2 = v_{0y}^2 - 2gy = (v_0\sin{45°})^2 - 2gy\)

At its maximum height H, \(v_y = 0\) so we can write

\(0 = (v_0\sin{45°})^2 - 2gH\)

or

\(H = \dfrac{(v_0\sin{45°})^2}{2g}\)

\(\:\:\:\:\:\:= \dfrac{[(9.6×10^3\:\text{m/s})\sin{45°}]^2}{2(9.8\:\text{m/s}^2)}\)

\(\:\:\:\:\:\:= 2.4×10^6\:\text{m}\)

The answers are 1) The value of R2 is not relevant as it implies a downward force on the plank, 2) The reactions at C and D are 66.3 N and 90 N, respectively, and 3) The vertical force at B to lift the plank clear of D is 686.4 N. The reaction at C is zero, and the reaction at D is 61.4 kg.

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78% of the houses in Elizabeth's town were for sale last summer.

To find the percentage of houses that were for sale last summer in Elizabeth's town, we need to divide the number of houses for sale by the total number of houses and then multiply by 100.

The total number of houses in Elizabeth's town is given as 9,000. Last summer, 7,020 houses were for sale. To calculate the percentage, we divide 7,020 by 9,000:

Percentage = (7,020 / 9,000) * 100

Simplifying the calculation:

Percentage = 0.780 * 100

Percentage = 78.0%

To explain further, we take the number of houses for sale (7,020) and divide it by the total number of houses (9,000) to get the ratio of houses for sale to the total. Multiplying this ratio by 100 gives us the percentage. In this case, 78.0% indicates that a significant portion of the houses in Elizabeth's town were available for sale during the summer.

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Answer:

The maximum radius of curvature of the bump is approximately 14.5 meters.

Explanation:

To calculate the maximum radius of curvature of the bump, we need to use the centripetal force equation:

F = mv²/r

where F is the force required to keep the car moving in a circle of radius r, m is the mass of the car, and v is the speed of the car.

At the instant when the car loses contact with the road, the normal force between the car and the road becomes zero. Therefore, the centripetal force required to keep the car moving in a circle is provided entirely by the force of gravity acting on the car.

The maximum radius of curvature occurs when the centripetal force required to keep the car moving in a circle is equal to the force of gravity acting on the car.

The force of gravity acting on the car is given by:

Fg = mg

where g is the acceleration due to gravity (9.81 m/s²).

Therefore, we can set F = Fg and solve for r:

mv²/r = mg

r = v²/g

Substituting the given values, we get:

r = (12 m/s)² / 9.81 m/s²

r ≈ 14.5 meters

Therefore, the maximum radius of curvature of the bump is approximately 14.5 meters.

Answer: kooi kooi

how r u and thanks for the free points :)

A. The magnitude of C can be determined.
D. The magnitude of C is between 1m and 10m.

When two vectors are added, the magnitude of the resulting vector can be found using the law of cosines. For the vectors A and B, the magnitude of their sum C is given by:
|C|² = |A|² + |B|² + 2|A||B|cosθ,

where θ is the angle between the vectors A and B. Since the directions of A and B are unknown, θ could take any value between 0 and 180 degrees. However, the minimum value of cosθ is -1, which occurs when θ = 180 degrees. Therefore, the minimum magnitude of C is:

|C|min = |A| - |B| = 1 m - 10 m = 9 m.

The maximum value of cosθ is 1, which occurs when θ = 0 degrees. Therefore, the maximum magnitude of C is:

|C|max = |A| + |B| = 1 m + 10 m = 11 m.

Therefore, the magnitude of C is between 1m and 10m, and it can be determined.

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correct question

Which of the following statements are true about the magnitude of the vector C, which is defined as the sum of two given vectors A and B with magnitudes 1m and 10m respectively, but unknown directions? (Choose all that apply.)

A. The magnitude of C can be determined.
B. The magnitude of C is less than 10m.
C. The magnitude of C is less than 1m.
D. The magnitude of C is between 1m and 10m.
E. The magnitude of C is greater than 11m.

Answer:

The combination of depth and temperature that produces the greatest water pressure is the greatest water density.

As the temperature of the water increases, its density decreases. Therefore, at the colder temperature of 5°C, the water will have a higher density than at the warmer temperature of 15°C.

According to the hydrostatic pressure equation, pressure is directly proportional to the density of the fluid and the depth at which the fluid is located. Therefore, the greatest water pressure will be produced at the greatest water density, which occurs at the colder temperature of 5°C.

Therefore, the combination of the greatest depth and the colder temperature of 5°C will produce the greatest water pressure.

The gravitational force F between two bodies of respective masses M and m and distance R is

\(F = G\dfrac{Mm}{R^2}\)

where G ≈ 6.7 × 10⁻¹¹ m³/(kg•s) is the universal gravitational constant.

8.1.1. Let M = mass of Earth, m = mass of person, and R = radius of Earth. At point C, the distance between the center of the Earth and the person is 3R, so the gravitational force has magnitude

\(F = G \dfrac{\left(6.0\times10^{24}\,\mathrm{kg}\right) \left(50\,\mathrm{kg}\right)}{3\times6.4\times10^6\,\mathrm m} \approx \boxed{1.0\times10^9 \,\mathrm{N}}\)

8.1.2. Using the same values for M and m, now take R = radius of Earth + 10³ m. Then the gravitational force is

\(F = G \dfrac{\left(6.0\times10^{24}\,\mathrm{kg}\right) \left(50\,\mathrm{kg}\right)}{\left(6.4\times10^6+10^3\right)\,\mathrm m} \approx \boxed{3.1\times10^9 \,\mathrm{N}}\)

Answer:

2.0 m/s

Explanation:

Remember that F = maF=maF, equals, m, a, where FFF is the net force, mmm is the mass of the object, and aaa is its acceleration. To solve this problem, we will need to first find the net force acting on the piano and then use F = maF=maF, equals, m, a to find the piano’s acceleration.

Hint #22 / 4

The net force is the sum of all of the forces on the piano. In this circumstance, Elvis's and Noah's forces are in the same direction, and the friction force is in the opposite direction. So, our net force equation would be:

​

=400 N+150 N−100 N

=450 N

Now, we can use F = maF=maF, equals, m, a and solve for the acceleration:

225 kg

450 N

=2.0

The acceleration of the piano is 2.0 m/s

The acceleration of the piano is 2m/s².

We know the formula for force is

F =ma

where f is force, m is mass and a is acceleration.

We need to calculate the total force used in moving the piano

F= Total force- Frictional force

F= 400N+150N-100N= 450N.

We have F=450N and m= 225kg

F=ma

450N= 225ˣ a

a= 450/225

a= 2m/s²

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