A ball is initially moving with a velocity 0.5m/s. Its velocity decreases at a rate of 0.05m/s^2. How much time will it take to stop? How much distance will the ball travel before it stops

Answer:

emf = - 0.622 V

Explanation:

The electromotive force is given by Faraday's law

         emf = [tex]- \frac{d \phi }{dt}[/tex]

         Ф = B. A

bold indicates vectors

        Ф = B A cos θ

in this case it is indicated that the magnetic field is constant and the angle between the magnetic field and the normal to the area is parallel, so the cos 0 = 1

we substitute

           emf = [tex]- B \ \frac{dA}{dt}[/tex]

the area of ​​the circle is

          A = pi r²

         [tex]\frac{dA}{dt} = \pi 2r \ \frac{dr}{dt}[/tex]

       emf = B 2π r [tex]\frac{dr}{dt}[/tex]

speed is defined

       v = [tex]\frac{dr}{dt}[/tex]

we substitute

        emf = - 2π B r v

let's calculate

        emf = - 2π  0.5  1.65  π0.12

        emf = - 0.622 V

Answer: Your question is open ended therefore i will provide a general answer based on the general concept of  your question.

Answer : At half distance between the center of the Magnetic field the magnetic pole the effect of the magnetic field generated will be half as strong

Explanation:

Magnetic force  ∝  1 / d^2

This simply means increase in the squared distance of an object leads to the decrease in the effect of the magnetic field generated by a current carrying wire.  

Hence ;  

At half distance between the center of the Magnetic field the magnetic pole, the effect of the magnetic field generated will be half as strong

Half the distance from a current-carrying wire to the body required to stand, in order for the magnetic field generated by the wire to be half as strong.

The magnetic field is the field in the space and around the magnet in which the magnetic field can be fill.

The value of magnetic field is reduced from a wire, with the distance of the wire.

The magnetic field is inversely proportional to the square of the distance of the current-carrying wire.

Hence, half the distance from a current-carrying wire to the body required to stand, in order for the magnetic field generated by the wire to be half as strong.

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Answer:

Due to waves.

Explanation:

The can merely moves up and down because the movement of the waves that propagate away from the disturbance caused by the boat. The Can has low density due to low mass and high volume which allow the can to float on the surface of water after prevent it from the drowning. The wave moves the can up and down but prevent it from going deep inside the water so we can say that the can moves due to movement of waves in water.

Answer:

51 Ω.

Explanation:

We'll begin by calculating the equivalent resistance of R₁ and R₃. This can be obtained as follow:

Resistor 1 (R₁) = 40 Ω

Resistor 3 (R₃) = 70.8 Ω

Equivalent Resistance of R₁ and R₃ (R₁ₙ₃) =?

Since the two resistors are in parallel connection, their equivalent can be obtained as follow:

R₁ₙ₃ = R₁ × R₃ / R₁ + R₃

R₁ₙ₃ = 40 × 70.8 / 40 + 70.8

R₁ₙ₃ = 2832 / 110.8

R₁ₙ₃ = 25.6 Ω

Finally, we shall determine the equivalent resistance of the group. This can be obtained as follow:

Equivalent Resistance of R₁ and R₃ (R₁ₙ₃) = 25.6 Ω

Resistor 2 (R₂) = 25.4 Ω

Equivalent Resistance (Rₑq) =?

Rₑq = R₁ₙ₃ + R₂ (series connection)

Rₑq = 25.6 + 25.4

Rₑq = 51 Ω

Therefore, the equivalent resistance of the group is 51 Ω.

Answer:

the acceleration of an object is directly pro to the net force acting on it and indirectingly proportional to its mass

Answer:

When Copernicus first systematically created his Sun-centered model of the universe, it did not lead to substantially better predictions of planetary positions than the Ptolemaic model because the Catholic Church, which was the power at the time, stated it was false, and anybody who believed Copernicus and spread the "myth" were excommunicated or even executed. This was because a sun centered universe would mean that everything the Catholic Church had been teaching about how the Earth was the center of the universe would be false. If people believed it, the church would no longer be seen as the infallible authority, so they needed to stop it from spreading.

Explanation:

The graphs show maximum gravitational potential energy for the pendulum and they correspond to positions #1 and #5.

Answer:

12. b

13. a

Explanation:

n a plate glass factory, sheets of glass move along a conveyor belt at a speed of 15.3 cm/s. An automatic cutting tool descends at preset intervals to cut the glass to size. Since the assembly belt must keep moving at constant speed, the cutter is set to cut at an angle to compensate for the motion of the glass. The glass is 73.4 cm wide and the cutter moves from one edge to the other in 3.0 s. At what angle to the width of the sheet should the cutter be set to move

Answer:

four times the

Explanation:

...........

Answer:

In the solar cells, the energy is obtained only during the day, when the Sun shines. .So, it increases the cost of using solar panels as the source of energy. So, the solar cell is not used to meet all our energy needs

hope this helps

have a good day :)

Explanation:

Answer:

In the solar cells, the energy is obtained only during the day, when the Sun shines. ... So, it increases the cost of using solar panels as the source of energy. So, the solar cell is not used to meet all our energy needs

Explanation:

n the solar cells, the solar panel convert solar energy into electricity, which is stored in storage battery. The storage battery give the direct current but all the appliances are working by the alternating current, so first of all direct current is converted into alternating current by any suitable appliances before it can be used to run various devices. So it increases the cost of using solar panels as the source of energy. 

Answer: 20

Explanation: Mass number is the number of neutrons plus the number of protons. 8 + 12 gives 20.

Mass number

Mass number is 20

Answer:

Explanation:

As given, the student has three balloons and rubs two of them on a piece of wool. The rubbing of balloon on wool is the independent variable as it was done on two and not on the third as control.

Answer:

60m/s

Explanation:

v=frequency ×wave length

v signifies the speed

The speed of a wave is the product of its frequency and wavelength. Hence the speed of the wave with a frequency of 20 Hz and 30 cm wavelength is 0.6 m/s.

Frequency of a wave is the number of wave cycles  produced at unit time. Thus it has the unit of s⁻¹ which is equivalent hertz Hz.

Wavelength of a wave is the distance it travels in a wave cycle or for a transverse wave the distance between two consecutive crests or troughs is called wavelength.

The relation between frequency v, wavelength [tex]\lambda[/tex] and speed of a wave c is written as below:

[tex]c = v \lambda[/tex]

By this expression it is clear that the speed of increases with frequecy and wavelength.

The frequency of the given vibrational source is 20 Hz and the wavelength is 3 cm or 0.03 m. Hence, the speed of the wave is calculates as follows:

c = 20 Hz × 0.3 m

  = 0.6 m/s.

Therefore, the speed of the wave is 0.6 m/s.

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Answer:

1 N2 +3 H2 ---> 2NH3

Explanation:

hope this helps

do mark it :D

Answer:

i dont think anything will happen so maybe A: the wall is larger than you.

Explanation:

The free body diagram allows to find the results for the forces applied on the refrigerator are;

       a) Free-body diagram with applied force.

       b) Free-body diagram without applied force.

A free-body diagram is a diagram of the forces without the details of the body, these diagrams are important to clearly visualize the forces and the coordinate systems against which to take measurements.

In the attached we have a free-body diagrams for a refirerator, represented by the box where the forces are appreciated:

Newton's second law states that the net force is proportional to the mass times the acceleration of the body.

             ∑ F = ma

where F is the force, m the mass and the acceleration

          ∑ F = F - fr = 100 N

          a = 100 / m

In conclusion with the free body diagram we can find the results for the forces applied on the refrigerator are;

a) Free-body diagram with applied force.

b) Free-body diagram without applied force.

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Answer:

physical attractiveness

Explanation:

Answer: [tex]40\ N/C[/tex]

Explanation:

Given

Magnitude of charge is [tex]q=0.5\ C[/tex]

Force experienced is [tex]F=20\ N[/tex]

Electric field intensity is the electrostatic force per unit charge

[tex]\therefore E=\dfrac{F}{q}\\\\\Rightarrow E=\dfrac{20}{0.50}\\\\\Rightarrow E=40\ N/C[/tex]

Thus, the electric field intensity is [tex]40\ N/C[/tex]

Answer:

C

Explanation:

a parallel circuit because there is more than one path

Answer:

C) a parallel circuit because there is more than one path

Explanation:

EDGE 2022

Answer:

6, 3, 2, 5, 4, 1

Explanation:

Let's describe them from smallest to largest. In fact the size order is not exact as there are exceptions.

An asteroid is a rocky body which lies in the asteroid belt between Mars and Jupiter. They are typically quite small object. The largest asteroid Ceres has been reclassified as a dwarf planet.

A moon is typically a rocky body which is in orbit around a planet. Some moons such as our Moon are quite large and are typically bigger than asteroid. Some moons can actually be smaller than some asteroids.

A planet is a nearly spherical body which is in orbit around the Sun. Planets are larger than moons.

A star is what planets orbit around. It is the source of light and heat. Our Sun is a star which is many times bigger than all of the planets.

A solar system is a star and all of its planets, asteroids, comets and other bodies. It is significantly bigger than a star.

A galaxy, such as our Milky Way Galaxy, is a collection of solar systems orbiting around a central core. Most galaxies have a supermassive black hole at their centres.

Galaxies also form clusters which are large scale structures.

The universe is everything. It contains billions of galaxies.

Explanation:

there is no relationship between small mass and the bigger mass, but it can be related with the acceleration. Since Force is constant, acceleration is inversely proportional to the mass. Greater the mass, lesser is the acceleration and vise versa

3.75 N

Explanation:

F = k(q)(q)/r^2 = 5 N

F' = k(q)(3q)/(2r)^2

= k×3(q)(q)/4r^2

= (3/4)[k(q)(q)/r^2]

= (3/4)F

= (3/4)(5 N)

= 3.75 N

The new electric force is 3.75 N.

The force on the charges by Coulomb's law is given by;

F = kq1q2/r^2

where q1=q2

F = kq1^2/r^2

Where F = 5N

If one of the charges triples;

q2 = 3q1

distance doubles = r = 2r

F' = 3kq1^2/4r^2

So;

F' = 3/4 F

F' = 3/4 × 5 = 3.75 N

The new electric force is 3.75 N.

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Answer:1. High Intensity Interval Training

HIIT stands for High Intensity Interval Training. HIIT is essentially a type of exercise, be it cardio or resistance training. HIIT. alternates between periods of high intensity, and low intensity (or recovery

2. flexibility and muscular strength

3. true

4. d

5. c

Explanation:

Answer:

0.909 J/gºC.

Explanation:

From the question given above, the following data were obtained:

Heat (Q) = 17000 J

Initial temperature (T₁) = 16 °C

Final temperature (T₂) = 38 °C

Mass (M) = 850 g

Specific heat capacity (C) =?

Next, we shall determine the change in the temperature of the metal. This can be obtained as follow:

Initial temperature (T₁) = 16 °C

Final temperature (T₂) = 38 °C

Change in temperature (ΔT)

ΔT = T₂ – T₁

ΔT = 38 – 16

ΔT = 22 °C

Finally, we shall determine the specific heat capacity of the metal. This can be obtained as follow:

Heat (Q) = 17000 J

Change in temperature (ΔT) = 22 °C

Mass (M) = 850 g

Specific heat capacity (C) =?

Q = MCΔT

17000 = 850 × C × 22

17000 = 18700 × C

Divide both side by 18700

C = 17000 / 18700

C = 0.909 J/gºC

Therefore, the specific heat capacity of the metal is 0.909 J/gºC.

Answer:

58.6 m/s²

Explanation:

Applying,

s = ut+gt²/2............ equation 1

Where s = height of the rock, u = initial velocity, t = time, g = accelration due to gravity of the planet.

From the question,

Given: s = 1.55 m, t = 0.23 s, u = 0 m/s (dropped from an height)

Substitute these values into equation 1

1.55 = (0×0.23)+g(0.23²)/2

1.55 = 0.0529g/2

0.0529g = 3.1

g = 3.1/0.0529

g = 58.6 m/s²

Answer:

792J

Explanation:

Use the formula Force × Distance

With 110 newtons being the force and 7.2 meters being the distance

Which gives 792 and work us measured in joules therefore its joules

Work done is the dot product of force and displacement. The work done on the box to push across the surface for 7.2 m by applying a force of 110 N is 792 J.

Force is an external agent acting on a body tp change it from the state of motion or rest.  Force is a vector quantity thus, it is characterized by a magnitude and direction.

When force acting on a body results in displacement of the body, it is said to be work done on the body. The work done on the body is the product of force and displacement.

W = F d.

Given the force acting on the box = 110 N

 displacement d = 7.2 m

Work done w = 110 N × 7.2 m

                       = 792 J.

Therefore, the work done on the box is 792 J.

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