A set of water waves travels at 10.0 m/s, and 4.0 waves pass you in 2.0 s. what is the wavelength of the waves?

Answers

Answer 1

Answer: Frequency is the number of waves passing in 1 second. 4 waves passes in 2 sec, so 2 waves will pass in 1 sec. Hence frequency is 2. Wavelength = speed of wave/frequency = 10/2 = 5m. Hence wavelength is 5m.

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An engineer in India (standard household voltage = 220 volts) is designing a transformer for use on herupcoming trip to Canada (standard household voltage = 120 volts). If her input coil has 240 turns, how many turns should her output coil have?
Adding an organism to a food chain does not affect the other members of the food chain, but removing an organism does.
A crate with a mass of 3.00 kg starts from rest at the top of a 27.0∘ incline and slides 2.00 m down the incline in 1.60 s. (a) What is the magnitude of the acceleration of the crate (in m/s² )? (b) What is the frictional force (in N) acting on the crate? (Enter the magnitude.) (c) What is the coefficient of kinetic friction between the crate and the incline? (d) What is the speed of the crate (in m/s ) after it has slid 2.00 m ?
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The Hoover dam is a hydroelectric power plant that converts the energy of falling water into electricity. Which of the following determines the amount of potential energy of the water stored in the reservoir of the dam? Choose all that apply.A.the electric potential energy of the water. B. the weight of the water C.the height of the water D. The temperature of the water (I think it's A and C but I'm not sure)

A kettle transfers 1500 J of energy, 1200 J to a thermal energy store and 300 J to a vibrational energy store (sound). How efficient is the kettle?

Answers

Answer: 0.8

Explanation:

The efficiency is defined as the ratio of total imput energy that is actually utilized to the end of the device.

So if we have a total transfer of 1500j of energy, and 1200j are used to heat the thing inside the kettle, 300j are not used to the actual function of the kettle.

So the efficiency is n = 1200j/1500j = 0.8

This means that a 80% of the energy imput is actually used to heat the kettle.

Final answer:

To calculate the efficiency of the kettle, divide the useful output energy (1200 J) by the total input energy (1500 J) and multiply by 100%. This results in an efficiency of 80%, meaning 80% of the energy was converted into useful thermal energy.

Explanation:

In order to find the efficiency of the kettle, we need to compute the ratio of the useful output energy to the total input energy and then multiply by 100% to convert the decimal to a percentage. In this case, the useful output energy is the 1200 J transferred to the thermal energy store. The total input energy is the total energy transferred by the kettle which is 1500 J. So, the efficiency of the kettle is (1200 J / 1500 J) * 100% = 80%.

The remaining 20% energy is wasted and was transferred to the vibrational (sound) energy store, which is a non-useful energy output. An efficient appliance is one which converts a higher proportion of the input energy into useful output energy, with less of it wasted. In this case, 80% of the energy from the kettle was converted into useful thermal energy, hence the kettle is quite efficient.

Learn more about Efficiency here:

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How important is your role as a human being in the natural world

Answers

Well, the natural world has existed for a long time without humans, so we know that we're not indispensable to the natural world.

We can influence it though, as is shown by the current man-made global warming: so it is important that we take good care of the part of the natural world that we live in so that we can live in it for a long time.

A truck accelerates 2 m/s2 when it is empty. If the truck is filled so that it has twice the mass and the same amount of net force is applied, how much will the truck accelerate?8 m/s2
1 m/s2
4 m/s2
2 m/s2

Answers

Answer :

a = 1 m/s^2

Explanation:

Given information

Net force is a constant

The mass of the truck is $m_(o)$

Initial acceleration $a_(o)$ = 2 m/ $s^(2)$

The mass of the truck is increased twice as much

$F_(net)= m_(o) a_(o)$ = ma

$F_(net)= m_(o) a_(o)$ = $2m_(o)$ a

a= $\frac{a_(o) } {2}$

a = 2/2

a = 1 m/ $s^(2)$

This is a conceptual problem, I’ll try to upload a picture:

Which currents carry warm water away from the equator?a. deep currents
c. surface currents
b. evaporation
d. freezing Please select the best answer from the choices provided A B C D

Answers

Answer:

Surface currents

Explanation:

The water at the ocean surface is moved by the winds which blows in certain pattern due to earth spin and Coriolis effect.wind is able to move top layer of ocean up to 400 m creating surface ocean current.

Ocean current carry warmth of water to higher Latitudes thus making the climate of that region less chilly.

the answer is
c. surface currents

How long does it take the moon to go from full-moon phase to new-moon phase

Answers

A complete cycle of phases is 29.531 days.
From full-moon to new-moon is half of that.

Answer:

About two weeks (15 days to be exact)

Explanation: Look at this cool emoji thing I did :)

⁣Scroll fast!

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Um I don't remember how to do this, help :(

Answers

Pressure is a measure of force per unit area:

P = F/A

The water exerts a pressure of 202 kPa = 202,000 Pa on the diver, who has a surface area of 1.50 m². Then the force exerted by the water is F such that

F = PA

F = (202,000 Pa) (1.50 m²)

F = 303,000 N = 303 kN

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