# Question: A 0.50 m wave has a frequency of 686 Hz. What is the speed of the wave? Answer Choices: (a) 170 m/s (b) 1,370 m/s (c) 340 m/s (d) 690 m/s

Frequency is the number of wavelengths per second and since the length is 0.5 you multiply 0.5*686 and get 343.
the question not allowing for one position thus the answer is c

## Related Questions

A piece of metal is? A. made of atoms
B. a solid
C. a type of matter
D. all of the above

D. All of the above.
The answer here would be D. as everything is made of atoms, metal is a solid, and it is a type of matter.

-Lucky

What can you predict about an element from its position in the periodic table

Based on its position in the periodic table, you can predict how many electrons it has, how many valence electrons, how many levels of electrons, and its atomic number and mass.

A uniformly charged conducting plate with area a has a total charge Q which is positive. The figure below shows a cross-sectional view of the plane and the electric field lines due to the charge on the plane. The figure is not drawn to scale. Find the magnitude of the field at point P, which is a distance a from the plate. Assume that a is very small when compared to the dimensions of the plate, such that edge effects can be ignored. Two uniformly charged conducting plates are parallel to each other. They each have area A. Plate # 1 has a positive charge Q while plate #2 has a charge - 3 Q. Using the superposition principle find the magnitude of the electric field at a point P in the gap.

a)  E = σ / 2 ε₀ =   Q / 2A ε₀, b)  E = 2Q/A ε₀

Explanation:

For this exercise we can use Gauss's Law

Ф = E. dA = / ε₀

Let us define a Gaussian surface as a cylinder with the base parallel to the plane. In this case, the walls of the cylinder and the charged plate have 90 degrees whereby the scalar product is zero, the normal vector at the base of the cylinder and the plate has zero degrees whereby the product is reduced to the algebraic product

Φ = E dA = q_{int} / ε₀       (1)

As they indicate that the plate has an area A, we can use the concept of surface charge density

σ = Q / A

Q = σ A

The flow is to both sides of loaded plate

Φ = 2 E A

Let's replace in equation 1

2E A = σA / ε₀

E = σ / 2 ε₀ =   Q / 2A ε₀

This is in the field at point P.

b) Now we have two plates each with a load Q and 3Q respectively and they ask for the field between them

The electric field is a vector quantity

E = E₁ + E₂

In the gap between the plates the two fields point in the same direction whereby they add

σ₁ = Q / A

E₁ = σ₁ / 2 ε₀

For the plate 2

σ₂ = -3Q / A = -3 σ₁

E₂ = σ₂ / 2 ε₀

E₂ = -3 σ₁ / 2 ε₀

The total field is

E = σ₁ / 2 ε₀  + 3 σ₁ / 2 ε₀

E = σ₁ / 2 ε₀  (1+ 3)

E = 2 σ₁ / ε₀

E = 2Q/A ε₀

When rocks are analyzed over an increasingly greater distance from a mid ocean ridge what can be said about the polarities of the rocks? A. They are constant

B. They alternate once

C. They alternate multiple times

C. They alternate multiple times

Explanation:

When rocks are analyzed over an increasingly greater distance from a mid ocean ridge the polarities of the rocks alternate multiples times. Rocks and minerals record  orientation of magnetic field of the Earth since the time they solidify. Periods when the north magnetic pole is located near Earth's South Pole are called reversed polarity.

The answer is C. They alternate multiple times.

The __________ has a center support bearing that carries the load between the inner and the outer flywheel and is fitted with damper springs to absorb shocks.

The dual mass flywheel

The dual mass flywheel has a center support bearing that carries the load between the inner and the outer flywheel and is fitted with damper springs to absorb shocks.

Explanation;

The dual mass flywheel eliminates excessive transmission gear rattle, reduces gear change/shift effort, and increases fuel economy. There are two basic types of Dual Mass Flywheels. The first is made up of a primary and secondary flywheel with a series of torsion springs and cushions.

-There is a friction ring located between the inner and outer flywheel that allows the inner and outer flywheel to slip. This feature is designed to alleviate any damage to the transmission when torque loads exceed the vehicle rating of the transmission. The friction ring is the weak spot in the system and can wear out if excessive engine torque loads are applied through it.

this event is the result of a sudden vertical offset in the ocean floor and is most often the result of plate movement on the ocean floor. It destroys coast lines and coastal settlements. What is the event called that causes this type of physical damage? a. Volcano b. Tsunami c. Landslide d. Liqufication pls help!

Explanation :

Tsunami is the result of a sudden vertical offset in the ocean floor and is most often the result of plate movement on the ocean floor.

Tsunami is caused due to the displacement of a large volume of water like in an ocean. It consists of a series of waves. It destroys coastlines and coastal settlements. It is also known as a tidal wave.

So, the correct option is (b) Tsunami.

Every winter I fly to Michigan. It's a total distance of 3900km. It takes 5 hours. What is my average speed?

Your average speed is 780 kilometer per hour.

Your average speed is exactly 3900 km per 5 hours.

In more familiar units,

(3900 km) / (5 hr) = (3900/5) (km/hr)  =  780 km/hr

Earth’s surface is subjected to unusually high rates of weathering. The Moon and some of the inner planets of our solar system are also subject to surface weathering, but at much slower rates. Which of the following statements most reasonably explains Earth’s uniquely rapid weathering rates?

Running water on the Surface of Earth.

Explanation:

Weathering can be defined as the phenomenon of breaking or disintegration of the rocks, minerals, soil etc. due to coming in contact with the Earth's atmosphere such as the Water, Wind, Organisms etc.

In this process the rocks, minerals disintegrate into lot of small particles.

But the rate of weathering on Earth is at a very unusual or unique rate because Earth's surface has the presence of the running water that leads to the high rate of surface weathering.

Therefore, the reason of Earth's rapid weathering rates is Running water on the Surface of Earth.

Prof. Kopp is working on an experiment located in an abandoned mine near Duluth, MN. The experiment is located approximately 713 m below the surface. He went to visit the site this last summer and took a harrowing ride in a bumpy, claustrophobic elevator down to the cavern. He timed the ride to last about 90 s. Compute the average speed of the elevator (in mph) as it plummeted to the bottom of the shaft.

The average speed of the elevator going down in the abandoned mine is 17.722mph.

Explanation:

If the elevator takes 90 seconds to descend a height of 713m, the average speed of the elevator is:

And if 1m/s is 2.23694mph, the average speed is:

.