A bucket of water experiencing a gravitational force of 525 N is pulled up from a water well

When a ferromagnetic material is placed in an electromagnetic coil and a magnetic field is applied, the magnetic induction (B) is increased.

Therefore, the correct answer is:

(a) There is a large increase in the magnetic induction (B)

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Answer: c

Explanation:

If the net force on the bowling ball is tripled, its new acceleration is 21 m/s². The correct option is d.

The force is the action of push or pull which can move or stop the object.

The initial force is F = mass x acceleration

F = 3.17515 kg x 7 m/s²

F = 22.23 N

When the net force is tripled, the new acceleration will b e

3 x F =m x a'

3 x 22.23 = 3.17515 x a'

a' = 21.003 m/s²

Thus, the new acceleration is 21 m/s². The correct option is d.

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You should aim at an above point cause of Refraction.

Refraction is an effect that occurs when light travels from the air to a denser medium like water. In general, the relative angle of incidence is different from the refracted one, as illustrated in the figure. Since the refracted angle of the light beam is narrower than the incident angle because water is denser than air, it is required to aim slightly above the actual location of the object from outside the pool in order for the light to reach it. Refractive Index can be calculated by the formula n = sin i/sin r

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Answer:

I should be active for 15 hours to meet the physical activity requirement.

Explanation:

Since time dilates in moving objects, we use the formula t = t₀/√(1 - β²) where t = time in space vehicle, t₀ = time on earth = 9 hours and β = v/c where v = speed of space vehicle = 0.8c.

So, t = t₀/√(1 - β²)

t = 9/√(1 - (v/c)²)

= 9/√(1 - (0.8c/c)²)

= 9/√(1 - (0.8)²)

= 9/√(1 - (0.64)

= 9/√0.36

= 9/0.6

= 15 hr

So, according to a timer on the space vehicle, I should be active for 15 hours to meet the physical activity requirement.

The maximum height attained by the bob is (7 + 3 * sqrt(2)) times the height it would attain if the bullet passed through it without being embedded in it.

Let h be the maximum height attained by the bob.

By conservation of momentum, the initial momentum of the bullet is equal to the momentum of the bullet-bob system after the collision:

m_bullet * v = (m_bullet + m_bob) * v'

where v' is the velocity of the bullet-bob system immediately after the collision.

By conservation of energy, the kinetic energy of the bullet before the collision is equal to the sum of the kinetic energy of the bullet-bob system immediately after the collision and the potential energy of the bob at its maximum height:

(1/2) * m_bullet * v^2 = (1/2) * (m_bullet + m_bob) * (v'/3)^2 + (m_bullet + m_bob) * g * h

Solving these two equations for v' and h, we get:

v' = v/4

h = (m_bullet * v^2)/(2 * (m_bullet + m_bob)^2 * g) * (7 + 3 * sqrt(2))

So the maximum height attained by the bob is (7 + 3 * sqrt(2)) times the height it would attain if the bullet passed through it without being embedded in it.

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A spinning magnetic field is generated by the stator in a DC motor, which causes the armature to rotate.

What takes place when a magnet rotates?

You use kinetic energy to move a magnet when you rotate it. Through the use of electromagnetism's characteristics, this kinetic energy can be transformed into electrical energy.

A current is induced in one direction as one side of the coil ascends through the magnetic field. The direction of the induced current changes as the rotation continues and that side of the coil descends. This indicates that the generator generates an ever-changing current. Alternating current, often known as a.c.

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The mass of an American Eagle silver bullion coin is approximately 31 grams.

What is American Eagle silver bullion?

American Eagle Silver Bullion refers to a popular silver investment coin produced by the United States Mint. It was first introduced in 1986 as part of the American Eagle Bullion Program, which also includes gold and platinum coins. The American Eagle Silver Bullion coin contains one troy ounce of 99.9% pure silver and has a face value of one dollar.

To calculate the mass of the silver bullion coin, we need to find its volume and then multiply it by the density of silver. The volume of the coin can be calculated using its dimensions.

The coin has a diameter of 40.6 millimeters, which can be converted to centimeters by dividing by 10. Therefore, the diameter is 4.06 centimeters. The coin is 2.98 millimeters thick, which is equivalent to 0.298 centimeters.

The volume of a cylinder, which represents the coin, is given by the formula: volume = π × r² × h, where r is the radius and h is the height (or thickness) of the cylinder. The radius can be found by dividing the diameter by 2. So, the radius is 4.06 / 2 = 2.03 centimeters.

Using the values of radius (2.03 cm) and height (0.298 cm) in the volume formula, we can calculate the volume of the coin. Then, by multiplying the volume by the density of silver (10.5 grams per cubic centimeter), we can find the mass of the coin.

After performing the calculations, the mass of the American Eagle silver bullion coin is approximately 31 grams.

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Answer:

Explanation:

Explanation:

The energy of a photon is given by :

\(E=\dfrac{hc}{\lambda}\)

Where

h is Planck's constant

c is the speed of light

\(\lambda\) is wavelength

or

\(E=hf\), f is the frequency

Energy is directly proportional to the frequency of an object.

The energy transported by a wave is directly proportional to the square of the amplitude.

This is a clear demonstration of the law of mass conservation, which is a basic principle of chemistry that applies to all chemical reactions.

The experiment that represents the law of mass conservation is given in the question. The answer is "c". The law of mass conservation is demonstrated by the following experimental results of the two students:  A student heats 1.00 g of a blue compound and obtains 0.64 g of a white compound and 0.36 g of a colourless gas

A second student heats 3.25 g of the same blue compound and obtains 2.05 g of a white compound and 1.17 g of a colourless gas. The law of mass conservation states that mass can not be created nor destroyed during a chemical reaction. Therefore, in any chemical reaction, the total mass of the reactants must be equal to the total mass of the products. In this case, the total mass of the reactants in each experiment is equal to the total mass of the products. The law of mass conservation applies to all chemical reactions. It is one of the basic principles of chemistry that is important to understand when studying the subject.

The law of mass conservation is a fundamental principle in chemistry that states that the mass of the reactant in a chemical reaction must be equal to the mass of the products. This principle is demonstrated by the experimental results of the two students in the question. In both experiments, the total mass of the reactants is equal to the total mass of the products. This is a clear demonstration of the law of mass conservation, which is a basic principle of chemistry that applies to all chemical reactions. The law of mass conservation is important to understand when studying chemistry, as it helps to explain many of the chemical reactions that occur in the natural world and in laboratories. In conclusion, the experimental results of the two students demonstrate the law of mass conservation.

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Answer:

6 v

Explanation:

Optical illusions occur because our brain is trying to interpret what we see and make sense of the world around us. Optical illusions simply trick our brains into seeing things which may or may not be real.

Answer:

that is true

Explanation:

Answer:

True.

Explanation:

Energy can be given off by heat, a lot of heat can be a sign of a lot of energy. And a shorter wavelength the more energy, which I've learned in school.

Answer:

(c) the male vocal cord is longer

Explanation:

Males have a lower pitch in their voises than females, elongating men's vocal cords.

I am joyous to assist you at any time.

Voice of man is heavy compared to a woman because male vocal cord is longer.

The change is caused by an enlargement in the vocal folds, generating a more serious and adult voice. Generally speaking, the male voice is deeper than the female voice because the vocal muscles grow more in men than in women.

Males have a lower pitch in their voises than females, elongating men's vocal cords.

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Answer:

Potential, tell me if that's wrong, and sorry if its wrong.

Explanation:

Answer:

A. it is Electromagnet

B. there are 2 ways to increase the magnetic field in this situation.

hence only by doing first way ( increase number of turns) magnetic field can be increased.

Answer:

4 seconds

Explanation:

4m is the distance moved by the object if 8 rev/s 36. A force of 10N, acting continuously, increases the kinetic energy of an object from 20J to 60J.

The increase in kinetic energy of an object is given by the formula ΔK = \((1/2)mv²\), where ΔK is the change in kinetic energy, m is the mass of the object and v is its velocity. Since the force acting on the object is constant, it can be expressed as F = ma, where F is the force, m is the mass and a is the acceleration.

The work done by the force is given by the formula W = Fd, where W is the work done, d is the distance moved by the object and F is the force.

Using the given information, we can set up the following equations:

\(ΔK = (1/2)mv²f - (1/2)mv²i\)

\(= (1/2)m(vf² - vi²)\)

= 40 J

F = ma

W = Fd

Since the force is acting continuously, we can use the equation W = ΔK to find the distance moved by the object. Substituting the given values into this equation, we get:

W = ΔK

10d = 40

d = 4 m

Therefore, the distance moved by the object is 4m. Option (c) is the correct answer.

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In order to replace the 700-N force P applied at point A, we can use two equivalent systems.

(a) For the first system, we can create an equivalent force-couple system at point C. This means applying a force of 700 N at point C in the opposite direction of the original force P, along with a couple moment. The magnitude of the couple moment would be 700 N multiplied by the perpendicular distance between points A and C.

(b) For the second system, we can replace the force P with a vertical force at point B and a second force at point D. The magnitude of the vertical force at B would be equal to 700 N, and the second force at D would have the same magnitude but in the opposite direction. These forces at B and D should be positioned in a way that the net effect is equivalent to the original force P at point A.

By using either the force-couple system at point C or the system with vertical forces at points B and D, we can achieve the same overall effect as the original force P at point A.

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Answer:

energy and matter

Explanation:

physics is the study of matter and it interaction with energy

a) The resistance will be:

R = V / I = 12 V / 0.80 A = 15 Ω

b) E = P * t = 9.6 W * 60 s = 576 Joules

2) The 75 W lightbulb used at 120 V will have a relative brightness of 18.75 W 120 V bulbs.

a) To calculate the resistance, we can use Ohm's Law, which states that resistance (R) is equal to the voltage (V) divided by the current (I). Therefore, the resistance can be calculated as follows:

R = V / I = 12 V / 0.80 A = 15 Ω

b) The power (P) consumed by the battery can be calculated using the formula: P = V * I, where V is the voltage and I is the current. The energy (E) consumed in a given time period can be calculated by multiplying power (P) by time (t). In this case, since we want to find the energy consumed in a minute, the time is 60 seconds.

P = V * I = 12 V * 0.80 A = 9.6 W

E = P * t = 9.6 W * 60 s = 576 Joules

The power of the lightbulb remains constant regardless of the voltage applied, so the power rating of the lightbulb is still 75 W. However, the brightness of a lightbulb is typically measured in terms of its luminous flux, which is not directly proportional to power. Luminous flux is measured in lumens (lm).

To determine how bright the 75 W lightbulb will be at 120 V relative to 75 W 120 V bulbs, we need to compare the luminous flux. Assuming the lightbulb's resistance remains constant, we can use the formula for power (P) in terms of resistance (R) and voltage (V): P = V^2 / R.

For the 75 W lightbulb at 240 V:

P1 = 75 W

V1 = 240 V

For the lightbulb at 120 V:

P2 = ?

V2 = 120 V

Using the formula, we can solve for P2:

P1 / P2 = (V1 / V2)^2

75 W / P2 = (240 V / 120 V)^2

75 W / P2 = 2^2

75 W / P2 = 4

P2 = 75 W / 4 = 18.75 W

Therefore, the 75 W lightbulb used at 120 V will have a relative brightness of 18.75 W 120 V bulbs.

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Density is the mass per unit volume of any object. It is calculated by dividing the mass of an object by its volume. This is:

ρ = m/V

ρ = 4.05 g  / 12 mL

ρ = 0.3375 g/mL

OPTION A

As stream discharge increases, only velocity increases.

The discharge or volume flow rate is defined as the product of the velocity of the fluid and the area of cross- section of the pipe or tube.

Discharge Q = Area A x Velocity V

Q = AV

The discharge is directly proportional to the velocity of the fluid. When discharge increases, velocity is the only physical quantity that can be changed.

Thus, As stream discharge increases, only velocity increases.

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A block of aluminum has a volume of 15.0 ml and a mass of 50.5 g. the density is: 3.36 g/ml

To solve this problem the density formula and the procedure that we have to use is:

d = m/v

Where:

Information about the problem:

Applying the density formula we get:

d = m/v

d = 50.5 g/15.0 ml

d= 3.36 g/ml

It is a physical quantity that expresses the ratio of the body mass to the volume it occupies.

What is volume?

It is the space occupied by a body, it is calculated by multiplying its dimensions, for example: length, height and width.

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When the string is not present, the only forces acting on the book are the weight force and the normal force.

a. The free-body diagram for the book would show the following forces:

- Weight force (downwards)
- Normal force (upwards)
- Force of tension (in the direction of the string)

b. When the string is not present, the only forces acting on the book are the weight force and the normal force. These forces are the same as the weight force and the normal force in the case where the string is present and not pulling on the book.

However, when the string is pulled, an additional force of tension is exerted on the book. This force is in the direction of the string and has a magnitude equal to the force applied to the string.

Overall, the forces exerted on the book when the string is present and pulled are greater than when the string is not present.

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Answer:

Work is said to be done when a force applied to an object moves that object. We can calculate work by multiplying the force by the movement of the object.

Answer:

Work is done by a force on an object if (i) a force acts on the object and (ii) the object is displaced from its original position

Answer:

1: Light jog to get heart rate up for about 5 minutes

2: Static stretches held for 10 seconds each stretch to loosen up.

3: Activity specific drills such as high knees, butt kicks, skipping, grapevines.

4: 15-45 minute exercise or sport activity.

5: Walk to bring heart rate down, followed by stretches held for as long as 30 seconds.

Warming up and cooling down are essential steps to a good exercise routine. However, it is important to know the correct moment where each of these activities should be performed.

Based on this, we can consider that the correct steps are:

With that in mind, we can conceptualize Warming Up and Cooling Down as follows:

Thus, we can conclude that warming up and cooling down is essential for a good physical exercise routine, as it allows for the optimization of exercise and prevents injuries to the body.

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