What type of electromagnetic waves do heat lamps give off?

A. infrared

B. ultraviolet

C. microwaves

D. radio waves

A simple pendulum makes 130 complete oscillations in 3.10 min at a location where g = 9.80 m/s²: (a) The period of the pendulum is approximately 1.43 seconds (s). (b) The length of the pendulum is approximately 0.80 meters (m).

(a) The period of a simple pendulum is the time taken for one complete oscillation. We can calculate the period (T) using the formula:

T = (time taken for oscillations) / (number of oscillations)

Given that the pendulum makes 130 complete oscillations in 3.10 minutes, we need to convert the time to seconds:

T = (3.10 min × 60 s/min) / 130

T ≈ 1.43 s

Therefore, the period of the pendulum is approximately 1.43 seconds.

(b) The length of a simple pendulum can be determined using the formula:

L = (g × T²) / (4π²)

Substituting the value of the period (T) calculated in part (a) and the acceleration due to gravity (g = 9.80 m/s²), we can find the length (L):

L = (9.80 m/s² × (1.43 s)²) / (4π²)

L ≈ 0.80 m

Thus, the length of the pendulum is approximately 0.80 meters.

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Answer:

4.7m

Explanation:

Given parameters:

Mass of the book  = 1kg

Gravitational potential energy  = 46J

Unknown:

Height of the shelf  = ?

Solution:

The potential energy is due to the position of a body above the ground.

        Gravitational potential energy  = mgh

m is the mass,

g is the acceleration due gravity  = 9.8m/s²

h is the height which is unknown

                       46  = 1 x 9.8 x h

                       h  = 4.7m

When training on an uneven surface, the percentage of total power achievable is typically lower compared to training on a level surface. This is because the body needs to work harder to stabilize itself and adapt to the uneven terrain, resulting in a higher energy expenditure.

1. Training on an uneven surface introduces various challenges and demands more from the body. The uneven terrain requires the muscles to constantly adjust and stabilize, leading to increased muscle activation and energy expenditure.
2. As a result, the body needs to work harder to maintain balance and stability during exercises or movements on an uneven surface. This increased effort leads to a higher energy demand and a lower percentage of total power being available for the primary movement or exercise being performed.
3. In contrast, training on a level surface provides a more stable and predictable environment, requiring less energy expenditure for maintaining balance and stability. Therefore, when training on a level surface, a higher percentage of total power can be dedicated to the primary movement or exercise, allowing for more efficient and effective training.

Overall, training on an uneven surface may offer additional benefits such as improved proprioception and core strength, but it typically results in a lower percentage of total power achievable due to the increased energy demands of stabilizing the body.

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Answer:

should be D

Explanation:

pls make this the brainliest

The plasma oscillations occur at a frequency of approximately = 9 × 109 Hz.

Plasma oscillations, also known as plasma frequency, can be determined using the formula:

f = (1 / (2π)) * √(ne^2 / (ε₀m))

where f is the frequency, n is the number density of electrons, e is the elementary charge, ε₀ is the vacuum permittivity, and m is the mass of an electron.

Given the number density of the plasma as 1018 m^(-3), we can substitute this value into the formula:

f = (1 / (2π)) * √((1018) * (1.6 x 10^(-19))^2 / (8.85 x 10^(-12) * 9.11 x 10^(-31)))

Simplifying the expression:

f ≈ 9 x 10^9 Hz

Therefore, the plasma oscillations occur at a frequency of approximately 9 x 10^9 Hz, which corresponds to option C) 9 × 109 Hz.

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Answer:

Push - The most common form of force is a push through physical contact (like a lawnmower or shopping cart)

Pull - You can apply a force by directly pulling on an object (like pulling a wagon)

Explanation:

-- you sit on a chair

-- gravity pulls something down

-- water pushes a log up to float

-- air holds the skin of a balloon out, in a ball-shape

-- my dog bites a bone

-- air holds the tires of my car out, in donut shapes

-- a book presses on a table

-- my shoes press down on the floor

-- my feet press down on the bathroom scale

-- the bathroom scale presses up on my feet

-- gravity pulls the Earth up toward me

Answer:

50 feet or more

Explanation:

In order to quickly respond to hazardous situation in a timely manner, it is important to be alert with all senses and there are situations such as while driving , the present of an hazard can only be heard, such as when other cars honk their horns

As such a citation can be issued by a police officer when a vehicle travels through the highway while using a sound amplification system which can be heard at a distance of 50 or more ft. outside the vehicle.

A police officer may issue a ticket when a vehicle is being operated on a highway using a sound amplification system, radio, or tape player, etc. If this sound amplification can be heard outside the vehicle at a distance of Fifty (50) feet or more.

Reaching one destination safely without any accidents is largely in the hand of the driver. As the auto vehicle can be a most deadly weapon and highway may be the most dangerous place in the world some of the rules is been implemented to ensure the safety of the people on the highways.

With open senses, the driver prevents any accidents. To prevent any accidents and respond within time. Driver must keep open his ears if any other driver is honking their horns.

Thus, A police officer may issue a ticket when a vehicle is being operated on a highway using a sound amplification system, radio, or tape player, etc. If this sound amplification can be heard outside the vehicle at a distance of Fifty (50) feet or more.

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Answer:

5.83

Explanation:

Divide the distance by velocity

Answer:

Tension is 36.75 N

Explanation:

yea the 2nd one-:

Using F = ma,

For 5 kg particle;

For 3 kg particle; Adding; 2g

a

5g − T T − 3g

= 5a [1] = 3a

= 8a

= 14 g s − 2

∴ Acceleration is 2.45 m Substituting into equation [1]

5 g − T = 5 × 14 g 15 g = T

4

Answer:

Explanation:

What is simple harmonic motion?

"Simple harmonic motion is a type of motion directed along a straight line, whose acceleration is fixed towards a point  and is proportional to its distance from that point"

An object is said to be in simple harmonic motion if the following occurs:

• It moves in a uniform path.

• A variable force acts on it.

• The magnitude of the force is proportional to the displacement of the mass.

• The force is always opposite in direction to the displacement direction.

• The motion is repetitive and a round trip, back and

  forth, is always made in equal time periods

The three examples of situations in which mass is the main factor determining an object's momentum are, a moving truck, a moving trailer and a rolling block.

P = mv

where;

The three examples of situations in which mass is the main factor determining an object's momentum is below;

The three examples given above shows three objects with heavy mass.

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Based on the calculations, the speed of this roller coaster at the bottom of the hill is equal to: B. 39.6 m/s.

Given the following data:

Height = 80.0 meters.

Scientific data:

Acceleration due to gravity (g) = 9.8 m/s².

In accordance with the law of conservation of energy, the potential energy possessed by the roller coaster at the top is equal to the kinetic energy possessed by the roller coaster at the bottom of the hill:

PE = KE

mgh = ½mv²

2mgh = mv²

v = √(2gh)

Substituting the given parameters into the formula, we have;

v = √(2 × 9.8 × 80)

v = √1,568

Speed, v = 39.6 m/s.

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Explanation:

Density = mass / volume

ρ = (500 g) / (8.0 cm × 6.0 cm × 5.0 cm)

ρ = 2.1 g/cm³

The volume of the block the product of its dimensions that is  240 cm³. Then density of the block weighing 500 g is 2.08 g/ cm³.

Density of a substance is the measure of its mass per unit volume. It describes how closely its particles are packed within a given volume. It is the ratio of mass to the volume.

Volume of an object is the space occupied by the object. For a rectangle block, volume is the product of length, width and height.

Given, l = 8 cm

width = 6 cm

h = 5 cm

volume =  l w h = 6 cm × 5 cm × 8 cm  = 240 cm³

Mass of the block = 500 g

density = mass/ volume

d = 500 g/240 cm³

   =  2.08 g/cm³

Therefore, the density of rectangular block is 2.08 g/cm³.

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The wavelength, the speed of sound and the water level of the next resonant length (the fifth harmonics) are as follows;

An harmonics are waves with a frequency that is an integer multiple of the fundamental frequency.

The given frequency of the sound wave, f = 330 hz

The first water level that gives the first loud sound, l₁ = 17.8 cm

The water level from the open end at the second loud sound, l₂ = 57.3 cm

First part;

The first harmonics that gives the fundamental frequency for the pipe is expressed as follows;

\(\dfrac{\lambda}{4} = l_1+e\)
Where;

e = The distance to the antinode of the wave above the top of the pipe

The third harmonics is given by the formula

\(\dfrac{3\cdot \lambda}{4} = l_2+e\)

\(\dfrac{3\cdot \lambda}{4}- \dfrac{\lambda}{4} = \dfrac{\lambda}{2} = (l_2+e) - (l_1+e) = l_2 - l_1\)

\(\dfrac{\lambda}{2} = l_2 - l_1\)

λ = 2 × (l₂ - l₁)

λ = 2 × (57.3 - 17.8) = 79

The wavelength of the wave, λ = 79 centimeters = 0.79 meters

Second part;

Speed of sound, v = f × λ

Therefore; v = 330 Hz × 0.79 m = 260.7 m/s

Third part;

\(\dfrac{\lambda}{4} = l_1+e\)

\(\dfrac{3\cdot \lambda}{4} = l_2+e\)

Which gives; 3·(l₁ + e) = l₂ + e

3·l₁ + 3·e = l₂ + e

3·e - e = l₂ - 3·l₁

2·e = l₂ - 3·l₁

Therefore, 2·e = 57.3 - 3 × 17.8 = 2.9

The water level for the next resonant length, which is the fifth harmonics, is given by the formula;

\(\dfrac{5\cdot \lambda}{4} = l_3+e\)

Which gives;

\(l_3 = \dfrac{5\cdot \lambda}{4} - e\)

Therefore;

\(l_3 = \dfrac{5\times 79 }{4} - 1.95 = 96.8\)

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Answer:

The main difference between these types of motion is that circular motion is a special case of rotational motion, where the distance between the body’s centre of mass and the axis of rotation remains fixed.

Rotational motion is based around the idea of rotation of a body about its center of mass. In rotational motion, the axis of rotation and centre of mass could change whereas in circular motion, the axis of rotation and centre of mass does not change.

Circular motion is a movement of an object along the circumference of a circle or rotation along a circular path and can either have a constant angular rotation rate and constant speed, or it can exist with a changing rate of rotation.

Think of one of those fairground rides where people sit on dummy horses. Now imagine the horses spin around the post that holds them to the base of the ride. Then you have both rotational motion of the horse and circular motion as the horses move around the ride.

A wind turbine blade with a radius of 24 m and a mass of 1380kg rotates at 1.5 revolutions per minute. the net force acting on the tip of the turbine blade is 23,327,296 N.

First, we need to calculate the speed of the tip of the blade:

Circumference = 2 x π x radius = 2 x 3.14 x 24 = 150.72 m

Speed = Circumference x frequency = 150.72 x 1.5 = 226.08 m/s

Next, we can calculate the centripetal force using the formula:

Centripetal force = (mass x velocity²) / radius

Plugging in the given values, we get:

Centripetal force = (1380 kg x (226.08 m/s)²) / 24 m

Centripetal force = 23,327,296 N

Therefore, the net force acting on the end of the turbine blade is 23,327,296 N.

It is measured in newtons and can be classified as contact or non-contact force. Contact force occurs when two objects touch each other, while non-contact force occurs at a distance.

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The time taken for the coffee to cool from 93°C to 73°C is approximately 36.1 minutes.

The cooling law is given by:

$$\frac{dQ}{dt}=-k(T-T_0)$$

where Q is the heat in the object, t is the time taken, T is the temperature of the object at time t, T0 is the temperature of the environment and k is a constant known as the cooling constant.

We need to find the time it takes for the coffee to reach a drinking temperature of 73°C given that its initial temperature is 93°C.

Therefore, we need to find the time it takes for the coffee to cool down from 93°C to 73°C when placed in a room temperature of 18°C.

Let’s assume that the heat energy that is lost by the coffee is equal to the heat energy gained by the environment. We can express this as:

dQ = - dQ where dQ is the heat energy gained by the environment.

We can substitute dQ with C(T-T0) where C is the specific heat capacity of the object.

We can rearrange the equation as follows:

$$-\frac{dQ}{dt}=k(T-T_0)$$

$$-\frac{d}{dt}C(T-T_0)=k(T-T_0)$$

$$\frac{d}{dt}T=-k(T-T_0)$$

The differential equation above can be solved using separation of variables as follows:

$$\frac{d}{dt}\ln(T-T_0)=-k$$

$$\ln(T-T_0)=-kt+c_1$$

$$T-T_0=e^{-kt+c_1}$$

$$T=T_0+Ce^{-kt}$$

where C = e^(c1).

We can now use the values given to find the specific value of C which is the temperature difference when t=0, that is, the temperature difference between the initial temperature of the coffee and the room temperature.

$$T=T_0+Ce^{-kt}$$

$$73=18+C\cdot e^{-0.09t}$$

$$55=C\cdot e^{-0.09t}$$

$$C=55e^{0.09t}$$

$$T=18+55e^{0.09t}$$

We can now solve for the value of t when T=93 as follows:

$$93=18+55e^{0.09t}$$

$$e^{0.09t}=\frac{93-18}{55}$$

$$e^{0.09t}=1.3636$$

$$t=\frac{\ln(1.3636)}{0.09}$$

Using a calculator, we can find that the time taken for the coffee to cool from 93°C to 73°C is approximately 36.1 minutes.

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We know that

• The initial speed is 5.8 m/s.

• The time elapsed is 1.1 seconds.

• The final speed is zero because it will stop.

Let's find the acceleration. We have to use a formula that involves the initial speed, the time spent, the final speed, and acceleration.

Now we use the given magnitudes to solve for a.

(a) The magnitude of the chicken's acceleration is -5.3 m/s^2.

Now, to find how far the chicken slid, we have to use a formula that includes distance.

Let's use the magnitudes we know to find d.

(b) The chicken slid 3.2 meters.

As you can observe, the positive direction of the movement is towards the home plate. So, the acceleration is towards the third base because it's negative, that is, the chicken is slowing down to get to home plate.

Therefore, the direction of the acceleration is towards the third base.

Answer:

The first one is tangent, second is tangential.

Answer:

Kelvin

Explanation:

Kelvin is the universal and scientific unit for temperature as Celsius and Fahrenheit temperatures we use in everyday situations

Answer: Which of these statements is most likely correct about the stars?

Star 2 attracts Star 1 with a greater gravitational force than Star 1 attracts Star 2.

No, because Third Newton Law states that both forces are equal in magnitude.

Earth exerts almost equal gravitation force on both the stars.

No, because the Universal Gravitational Law, estblished by Newton, states the atraction force to two masses is proportional to the product of the masses.

Star 1 attracts Star 2 with a greater gravitational force than Star 2 attracts Star 1.

No (same reason for the first statement)

Earth exerts greater gravitation force on Star 2 than on Star 1.

Right. This is the correct statement. Given the mass of Star 2 is greater than the mass of Star 1, by the Universal Gravitational Law, the earth exerts greater gravitational attraction on Star 2.

Explanation:

:)

Answer:

A

Explanation:

It’s a because a electrolyte reproduces

In electric circuits, we measure the pressure, also known as the voltage or electric potential difference. Voltage is a fundamental electrical quantity measured in volts (V).

It represents the potential energy per unit charge available in a circuit. Voltage is analogous to pressure in a fluid system, as it determines the rate at which electric charges flow through a conductor. In a circuit, voltage provides the driving force for the movement of electrons. It can be measured using a voltmeter, which is connected in parallel across the component or portion of the circuit being measured. Voltage measurements help assess the performance, efficiency, and safety of electrical systems, enabling engineers and technicians to diagnose and troubleshoot circuit problems, design appropriate power supplies, and ensure proper functioning of electronic devices.

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Answer:

balance

Explanation:

The correct answer is b. The drift velocity is very slow, and typically describes a microscopic displacement over a period of a second.

The drift velocity refers to the speed at which electrons move through a wire under the influence of an electric field. It is a very slow speed, typically only a few millimeters per second, and is the result of the collisions that electrons experience with the metal atoms in the wire.

Electric current is the flow of electrons in a conductor, such as a wire. Individual electrons do not, however, move quickly through the wire. The average speed at which electrons flow across a wire while an electric field is present is referred to as the drift velocity.

Electrons frequently interact and shift direction because of collisions with other particles in the conductor. These collisions reduce their net movement and impede their total advancement. In comparison to the speed of individual electrons, the drift velocity is on the order of millimetres per second.

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Answer:

Yoyoyoyoyooyoyy

Explanation:

Yoyoyoyoyoyoyoyoyooy

Answer:

yoyoyoyoyoyooyoyoyoyoyyoyoy

This is an example of an inelastic collision. In an inelastic collision, some of the initial kinetic energy is lost, and the objects move away from each other with a reduced speed, as is the case here.

Collision is the physical contact between objects, causing them to interact and exchange energy. This can occur when two or more objects come into contact with each other while moving at different speeds. Collisions can be elastic or inelastic, depending on the type and amount of energy lost in the interaction. Elastic collisions are those in which the total kinetic energy of the objects is the same before and after the collision, while in inelastic collisions some energy is lost in the form of heat, sound, or other forms of energy.

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In this case, a body of mass 5 kg kept at a height of 10 m. So, the potential energy is given as 500 J.

An object's potential energy is its stored energy. This energy has the capacity to be productive. An object's potential energy is provided by gravity. Gravity's downward force is the source of this potential energy.

The acceleration brought on by gravity is known as the gravitational constant, or g. On Earth, this acceleration is equivalent to 10 metres per second. PE = mgh is the equation for potential energy resulting from gravity. The object's potential energy declines and its kinetic energy rises as it approaches the ground.

Potential Energy = 5 x 10 x 10 = 500J.

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Answer:

Matter are anything that is made up of atoms. The quantity of matter can be observed only on the basis of mass and volume calculation. Therefore, the correct option is option D.

What is matter?

Matter is a substance that has some mass and can occupy some volume. The matter is mainly used in science. Matter can be solid, liquid or gas.

Matter is anything that is made up of atoms. Anything around us that can be physically seen and touched are matter. Ice, water and water vapors are example of matter.

So as we saw that matter has some mass so mass can be measured in gram only. Mass can also be represented as number of molecules. We also saw that matter occupy some volume and that volume is measured only in liter. For a gravitational field to be generated between two objects, Both objects must have mass.

Therefore, the correct option is option D.

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