How much power does a toaster have if it does 21,000 joules of work in 30 seconds?

The correct answer to the question is 0.3 m/s i.e the speed of the wave is 0.3 m/s.

CALCULATION:

As per the question, the wavelength of the wave is given as [tex]\lambda=\ 3\ m.[/tex]

The frequency of the wave f = 0.1 Hz.

We are asked to calculate the speed [ V ] of the wave .

The relation among speed, frequency and wavelength of a  wave is given as -

                            speed = frequency × wavelength

                           ⇒ V =  f × [tex]\lambda[/tex]

                                   = 3m × 0.1 Hz

                                   = 0.3 m/s.                        [ans]

Hence, the speed of the wave will be 0.3 m/s.

Answer:

7055.13 J

Explanation:

Step 1: identify the given parameters

Note: frictional force between the piano and horizontal surface is zero since the plank is frictionless.

Step 2: work done in sliding the piano up the plank = applied force X distance moved by the piano.

The distance moved by the piano is equal to the height above ground when the piano reach top of the plank.

Height of the triangle = 3.49m X sine31.6⁰

Height of the triangle = 1.8287m

Recall, height of the triangle is the height above ground which is equal to the distance moved by the piano

work done in sliding the piano up the plank = applied force X distance moved by the piano.

work done in sliding the piano up the plank = 3858N X 1.8287M

                                                                           = 7055.13 J

B.) Any physical laws are the same for the entire universe.

Answer: Weatherstripping can refer to either the process or the agent that is used to seal small openings around windows, doors, trunk lids and other areas where a tight seal is desired. Essentially weatherstripping is designed to eliminate a flow or draft from an interior space to an exterior space. Because of this property, weatherstripping is often added to window sashes and doors in order to allow for more efficient heating and cooling of the interior space.

So “B” Is the answer of your question.

Explanation:Weatherstripping can take on several different forms. When it comes to dealing with drafts originating from a small open space between the bottom of a door and the floor, the addition of a small rubber strip along the threshold will often be sufficient to seal the area. The weather stripping will effectively block the airflow between inside and outside, while still allowing the door to be opened and closed with ease. Weatherstripping doors may be accomplished when the door is hung, or added at a later time as the house settles.

hope this helps...

A rocket needs thrust greater than Earth's gravity to lift off into space, overcoming air resistance and gravitational pull. Hence, option a is the correct condition for achieving lift-off.

For a rocket to lift off into space, it requires a thrust that is greater than the Earth's gravity. This thrust is provided by the acceleration of the rocket as it ejects high-speed gas through its exhaust nozzles. The opposing forces, such as air resistance and gravitational pull, need to be overcome by this thrust for the rocket to ascend. In the ideal case, without air resistance and neglecting gravity, we could focus solely on the thrust force. However, in reality, rockets must achieve a final velocity great enough to break free from Earth's gravitational influence, which involves reducing the rocket's mass apart from fuel, and producing enough thrust to counteract both gravity and atmospheric drag.

In summary, option a, thrust that is greater than Earth's gravity, is the required condition for a rocket to lift off. Although air resistance and friction are factors that influence the efficiency of the rocket's ascent, achieving a thrust greater than Earth's gravitational pull is the primary necessity.

According to Newton's first law of motion, an object at rest will remain at rest and an object in motion will continue moving at a constant velocity unless acted upon by an external force. To make an object slow down, an external force in the opposite direction of its motion, such as friction, is required.

According to Newton's first law of motion, an object will continue moving at a constant velocity unless acted upon by an external force. To make an object slow down, an external force in the opposite direction of its motion is required. This force is called friction. Friction can be caused by various factors, such as air resistance or contact with a surface.

To find the position of the car at t = 3 s and t = 4 s, we need to find the area under the velocity graph up to those time points.

The position of an object at a given time can be determined from the velocity graph. To find the object's position at t = 3 s and t = 4 s, we need to find the area under the velocity graph up to those time points. In the figure, we can see that the displacement at t = 3 s is approximately 5 m and the displacement at t = 4 s is approximately 8 m.

https://brainly.com/question/34778074

#SPJ12

Answer:

the correct answer is speed, velocity scored incorrectly on my quiz

Explanation:

To support a tension of 24 kN, a cable made from steel wires that originally have a diameter of 1 mm should have a new diameter of 10 mm, which is one order of magnitude larger.

If a steel wire of diameter 1 mm can support a tension of 0.24 kN, to support a tension of 24 kN, we need to determine the required diameter of a cable made of these wires. The tension supported by a wire is directly proportional to the cross-sectional area, which is proportional to the square of the diameter. Therefore, if the tension increases by a factor of 100 (from 0.24 kN to 24 kN), the diameter must increase by a factor of the square root of 100, which is 10.

Hence, the new diameter would be 10 mm, which is a one order of magnitude increase from the original diameter of 1 mm.

Answer:

16m

Explanation:

To find a vector w with the same direction of u but twice as long as v, we can use unit vectors. The magnitude of u is √20 and the magnitude of v is √5. The unit vector parallel to u is (0, 2/√5, 1/√5) and the unit vector parallel to v is (2/√5, 1/√5, 0). Multiplying the unit vector parallel to u by 2 times the magnitude of v gives us the vector w = (4/√5, 2/√5, 0).

To find a vector w with the same direction as u but twice as long as v (u = {0 4 2} v = {2 1 0}), we can use the concept of unit vectors. First, let's calculate the magnitudes of vectors u and v. The magnitude of u is √(0^2 + 4^2 + 2^2) = √20. The magnitude of v is √(2^2 + 1^2 + 0^2) = √5.

To find a unit vector parallel to u and v, we divide each vector by its magnitude. The unit vector parallel to u is (0/√20, 4/√20, 2/√20) = (0, 2/√5, 1/√5). The unit vector parallel to v is (2/√5, 1/√5, 0).

To find a vector w with the same direction as u but twice as long as v, we can multiply the unit vector parallel to u by 2 times the magnitude of v. w = 2(2/√5, 1/√5, 0) = (4/√5, 2/√5, 0).

Answer:

C. electrons are transferred to the atom from other atoms through direct contact

Explanation:

When an atom is negatively charged then it means that the number of electrons in the atom is in excess in number as compare it to the number of protons

This is possible when an atom will transfer its electron to other atom. Here the transfer of electrons will produce negative or positive charge because electrons are loosely bounded while protons are strongly bounded inside the nucleus.

So here correct answer is given as

C. electrons are transferred to the atom from other atoms through direct contact

When a switch is closed in a circuit with an inductor, the current gradually increases from zero to a constant value. This is due to the property of inductors to initially oppose changes in current.

The question asks about the behavior of current in a circuit when a switch is closed, specifically in relation to an inductor with zero intrinsic resistance. The correct answer is d. The current gradually increases from zero to 1 and then remains constant. When the switch is closed, establishing an electrical connection, the current does not become instantaneously high. Rather, it gradually increases. This is because the inductor initially opposes the change in current. As current continues to flow, this opposition decreases and the current increases, eventually reaching a constant value.

https://brainly.com/question/32913097

#SPJ12

The process that charges a neutral body by touching it with a charged body is known as charging by contact.

Charging by contact is the process where a charged body touches a neutral body, transferring charge to it, unlike charging by induction which involves no direct touch.

This method requires the charged object, such as a positively charged glass rod, to physically touch the neutral object, transferring charge directly.

For instance, when a positively charged rod touches an electroscope, electrons move to neutralize the positive charges, resulting in the electroscope itself gaining a positive charge. Unlike charging by induction, where a charged object is brought near a neutral object without direct contact causing a redistribution of charges within the neutral object, charging by contact involves direct touch.

The momentum of the dancer is equal to 151 Kg.m/s.

The momentum of a body can be defined as the function of the mass of the body and its velocity. Momentum (p) can be determined as the kinetic energy of the body and is the multiplication of velocity (v) and mass (m).

The mathematical equation to calculate the momentum of the body is equal to:

p = m×v

The momentum can be described as the conserved quantity and will be zero if the velocity of an object is equal to zero.

Given, the mass of the dancer, m = 60 Kg

The height from the ground, h = 0.32 m

The initial velocity of the dancer, u = 0

v² - u² = 2gh

v² - 0 = 2 × 9.8 ×0.32

v² = 6.272

v = 2.53 m/s

The momentum of the dancer does he reach the ground:

p = 60 × 2.53

p = 151 Kg.m/s

Learn more about momentum, here:

brainly.com/question/17662202

#SPJ2

a) The particle's position at t = 2.10 s is 17.64 meters, and the velocity at this time is 16.8 m/s.

b) The position at a later time t = 2.10 s + Δt can be found by squaring the entire term (t + Δt) and multiplying by 4.

c) The limit of Δx/Δt as Δt approaches zero to find the velocity at t = 2.10 s. is 16.8 m/s.

The equation of motion for the particle as it moves along the x-axis is x = 4t² where x is in meters and t is in seconds.

(a) To find the position at t = 2.10 s, we simply plug the value of t into the equation: x = 4(2.10)² = 4(4.41) = 17.64 meters.

(b) The position xf at time t = 2.10 s + Δt is given by x_f = 4(t + Δt)².

(c) To find the velocity at t = 2.10 s, we take the limit of Δx / Δt as Δt approaches zero.

This is equivalent to the derivative of x with respect to t, which gives us the velocity: v = dx/dt = d/dt(4t²) = 8t. Substituting t = 2.10 s gives us v = 8(2.10) = 16.8 m/s.

(a) At t = 2.10 s, the position of the particle is 35.28 m. (b) At t = 2.10 s + [tex]\(\Delta t\)[/tex], the final position [tex](\(x_f\)) is \(4t^2 + 8.4t\Delta t + 4(\Delta t)^2\)[/tex] m. (c) The limit of [tex]\(\frac{\Delta x}{\Delta t}\) as \(\Delta t\)[/tex]approaches zero at t = 2.10 s is 16.8 m/s.

(a) Substitute t = 2.10 s into the given expression [tex]\(x = 4t^2\)[/tex] to find [tex]\(x = 4(2.10)^2 = 35.28\)[/tex] m.

(b) For [tex]\(x_f\)[/tex], we use the expression [tex]\(x_f = 4t^2 + 8.4t\Delta t + 4(\Delta t)^2\)[/tex] to account for the change in time [tex](\(\Delta t\)).[/tex]

(c) To find the velocity at t = 2.10 s, evaluate the limit of [tex]\(\frac{\Delta x}{\Delta t}\)[/tex] as [tex]\(\Delta t\)[/tex]approaches zero. Taking the derivative of [tex]\(x = 4t^2\)[/tex] with respect to t gives the instantaneous velocity, which is 16.8 m/s.

Understanding how to evaluate position at specific times and finding instantaneous velocity provides insights into the kinematics of particle motion.

The formation of bubbles, a change in color, and the formation of a precipitate (1, 3, & 5) are all indicators that a chemical reaction is occurring.

Indicators that a chemical reaction is occurring -

Chemical reactions involve the chemical interaction of two or more chemical substances, resulting in a new substance being formed, and are usually irreversible.

The signs of chemical reactions include gas formation, energy release in the form of light or flame, heat absorption, precipitate formation, and color change.

Thus, Indicators that a chemical reaction is occurring -

Learn more about:

https://brainly.com/question/1689737

The cyclist's displacement from the starting position after 64 seconds is 256 meters. Their position from point A after that time is 509 meters.

If a cyclist maintains a constant velocity of 4 m/s headed away from point A, their displacement after any given time can be calculated using the formula Δx = vt, where Δx is the displacement, v is the velocity, and t is the time. For a time of 64 seconds, the displacement would be Δx = (4 m/s) × (64 s) = 256 meters.

Since the cyclist starts 253 meters away from point A, the new position (total distance from point A) after 64 seconds can be found by adding the initial distance to the displacement. This gives us a total distance = 253 m + 256 m = 509 meters from point A.

The law of conservation of mass states that mass is neither created nor destroyed in chemical reactions, remaining constant.

The law of conservation of mass states that:

1. Mass cannot be created or destroyed in a chemical reaction or a physical change.

2. The total mass of substances before a reaction must equal the total mass of the substances after the reaction.

3. At the atomic level, this law implies that the number and types of atoms present in the reactants must equal the number and types of atoms in the products.

4. This principle holds true for closed systems where no mass is exchanged with the surroundings, although in nuclear reactions, mass can be converted into energy according to Einstein's famous equation E=mc²..

5. The conservation of mass is a fundamental principle in chemistry and underpins our understanding of chemical reactions and the behavior of matter in various processes.

Dispersion is the separation of white light into separate colors based on differences in wavelength.

Dispersion is the separation of white light into separate colors based on differences in wavelength. When light passes through a medium, such as a prism or a droplet of water, it is bent or refracted. However, different colors of light have different wavelengths, which causes them to refract at different angles. This results in the dispersion of white light into its constituent colors.

https://brainly.com/question/26017740

#SPJ6

Final answer:

The plane ends up flying northeast. To find its speed relative to the ground, use vector addition to calculate the resultant velocity as 694 km/hr.

Explanation:

Direction: The plane ends up flying northeast.

Speed Relative to the Ground: To find the speed relative to the ground, we need to calculate the resultant velocity. The plane's velocity relative to the air is northeast at an angle, while the wind blows from the west. Using vector addition, we determine the speed relative to the ground to be 694 km/hr.

Vector Addition: Vector addition is essential to determine the resultant velocity of the plane with respect to the ground, taking into account both the airspeed and the wind speed.

Answer:

option (A)

Explanation:

The amount of matter contained in the matter is called its mass.

Mass is a scalar quantity and it always remains constant.

The SI unit of mass is kg.

Answer:

Sun light and water