What is the speed of a wave yhat has a frequency of 2.0Hz

Answers

Answer 1

Answer: You can't tell the speed of a wave from only its frequency.

You also need to know either the wavelength, or what substance
the wave is traveling through.

-- If you know the frequency AND wavelength, you can
calculate the speed.

-- If you know what substance the wave is traveling in, you can
probably determine its speed without knowing anything else about it.

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[URGENT] A swimmer wants to end up at a dock due north of her starting position on the south shore of a river. In still water her maximum speed is 1.25m/s. The river has a current flowing 0.35m/s [E].a.) calculate the direction that she must aim herself through the water to arrive at the dock.

b.) how long will it take for the swimmer to cross the river, if the distance from the starting point to the dock is 300 m?

Please show all your work, thanks

Answers

a)The direction that she must aim herself through the water to arrive at the dock will be 73.7°.

b)The time it takes for the swimmer to cross the river will be 240 seconds.

What is speed?

Speed is defined as the rate of change of the distance or the height attained. it is a time-based quantity. it is denoted by u for the initial speed while v for the final speed. its si unit is m/sec.

Given data;

The maximum speed of the swimmer In still water,v=1.25m/s.

Speed of river = 0.35m/s [E]

α is the direction that she must aim herself through the water to arrive at the dock.

t is the time it takes for the swimmer to cross the river

The distance from the starting point to the dock is,s = 300 m

If the swimmer were to swim straight, the water's speed along the x-axis would have to match that of the swimmer.

$\rm v_w = v_x = 0.35 \ m/sec$

α is the angle between vx and v

The value of the

$\rm cos \alpha = (v_x)/(v) \n\n \alpha = cos ^(-1)((0.35)/(1.25) )\n\n \alpha = 73.7 ^0$

The time that the swimmer will use for reaching the dock;

s = V×t

t = s/(v)

t=300 m / 1.25 m/sec

t = 240 seconds

Hence, the direction that she must aim herself through the water to arrive at the dock. and it takes for the swimmer to cross the river will be 73.7° and 240 seconds respectively.

To learn more about the speed refer to the link;

brainly.com/question/7359669

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Explanation:

As you can see in the picture, we want the swimmer to go on a straight line, so the speed of the water must be equal to the speed of the swimmer along the x-axis. We also know the value of v, so we can calculate the of the cosine of the angle (alpha) between Vx and V. Thanks to the fundamental relation of gioniometry (cos^2(x) + sin^2(x) = 1) we can find the sine of alpha and calculate Vy. With Vy we can calculate the time that the swimmer will use for reaching the dock: s = Vy * t => t = s/(Vy).

I'll let you do all the calculations, you just have to plug in values.

An object-spring system undergoes simple harmonic motion. if the mass of the object is doubled, what will happen to the period of the motion?

Answers

The period of simple harmonic motion remains unchanged when the mass of the object is doubled.

What is simple harmonic motion?

Simple harmonic motion (SHM) is a type of periodic motion where an object oscillates back and forth around a fixed point in a regular and repeated manner. It is a special case of periodic motion, characterized by a restoring force that is proportional to the displacement from the equilibrium position. The classic example of SHM is a mass-spring system, where a mass is attached to a spring and is subjected to a restoring force proportional to the displacement from its rest position.

In SHM, the motion is always sinusoidal and the period of the motion is constant, which means that the time for one complete cycle of the motion remains the same. This type of motion is important in a variety of physical systems, including the vibration of mechanical systems, the oscillations of electrical circuits, and the motion of particles in a gravitational field.

Learn more about simple harmonic motion, here:

brainly.com/question/28208332

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T ⇒ √2T

T = 2π √(m/k)

T period
m mass
k spring constant

The equation NaCl →Na +Cl is a ______ reaction. A. decomposition B. single displacement C. synthesis

Answers

The correct answer is (a.) decomposition. The equation NaCl --> Na + Cl is a decomposition reaction. That is because the synthesis reaction looks like this Na + Cl = NaCl, and is the opposite of the decomposition. The decomposition reaction is the chemical reaction in which a single compound break into new compounds.

A periodic wave is produced by a vibratingtuning fork. The amplitude of the wave would be
greater if the tuning fork were
(1) struck more softly
(2) struck harder
(3) replaced by a lower frequency tuning fork
(4) replaced by a higher frequency tuning fork

Answers

The amplitude of the wave would be greater if the tuning fork were "struck harder" since this would make for a louder noise, which happens from higher amplitudes.

When a machine is used to perform a task, work output is always more than work input. please select the best answer from the choices provided t f?

Answers

properly input current above 40 voltage or 100 for example elecrical fan machine is used to perform a task, work output is always more than work

How is balanced force applied to the egg drop project?

Answers

Answer:

It is the gravity of the angles that connect with the egg and the angles of it

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