A wave's frequency is 2Hz and its wavelength is 4 m. What is the wave's speed?

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Answer 1

Answer: $w=lambda*f \n w=4m*2Hz \n w=8$

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At what age is the difference between the average height boys and girls

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Hey There!

The age that determines difference between the average height boys and girls, is 5 to 8.

Have A Brainly Day :)

A sample has a mass of 15 g and a volume of 3mL

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Thanks for sharing. The density of the sample
is 5 g/cm³. Do you have a question to ask ?

A person is rowing across the river with a velocity of 4.5 km/hr northward. The river is flowing eastward at 3.5 km/hr (Figure 4). What is the magnitude of her velocity ( v ) with respect to the shore?

Answers

The magnitude of her velocity with respect to the shore will be 5.70 Km/h. The change of displacement with respect to time is defined as velocity.

What is velocity?

Velocity is defined as the change in displacement with respect to time. The quantity of velocity is a vector quantity. It is a component that is time-based. It is measured in meters per second.

The given data in the problem is;

Q is the magnitude of Velocity of the boat = 4.5 km/hr

P is the magnitude of Velocity of the river flowing = 3.5 km/hr

R is the resultant of velocity P and Q=?

θ is the angle between the two velocities = 90°

From the law of vector addition;

$\rm R= √(P^2+Q^2+2PQcos\theta) \n\n \rm R= √((3.5)^2+(4.5)^2+2* 3.5 * 4.5 cos90^0) \n\n \rm R=5.70 \ m/sec$