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3 years ago

Help me please! I really need it!

Physics

1 answer:

Rus_ich [418]3 years ago

6 0

Answer:

5 Hz

Explanation:

count the number of cycles per 1 second

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If 4 resistors are wired in series, what is the equivalent resistance?

maria [59]

the 4 resistor wired in series is equal to 0.639 ohms

3 0

3 years ago

An electric pole casts a shadow of 24 m long . If the tip of the shadow is 25m far from the top of the pole , how high is the po

Vikentia [17]

Answer:

7 m

Explanation:

a^ + b^=c^

a^ + 24^=25^

a^+576=625

a^=625-576

a^=49

a=7

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3 years ago

The Gulf Stream off the east coast of the United States can flow at a rapid 3.9 m/s to the north. A ship in this current has a c

Alex Ar [27]

Answer:

72.54 degree west of south

Explanation:

flow = 3.9 m/s north

speed = 11 m/s

to find out

point due west from the current position

solution

we know here water is flowing north and ship must go south at an equal rate so that the velocities cancel and the ship just goes west

so it become like triangle with 3.3 point down and the hypotenuse is 11

so by triangle

hypotenuse ×cos(angle) = adjacent side

11 ×cos(angle) = 3.3

cos(angle) = 0.3

angle = 72.54 degree west of south

3 0

3 years ago

Read 2 more answers

Definition of wave velocity

maksim [4K]

Answer:

Velocity = frequency * wave length

Explanation:

Wave velocity is the measure of how fast the wave is being transmitted to a particular direction.

velocity implies both speed and direction as we know.

The velocity of a wave is equal to the product of its wavelength and frequency

where

frequency - number of oscillations per unit time (measured in Hz)
wave length - distance between corresponding points of two consecutive waves (measured in meters)

3 0

3 years ago

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A rock is thrown vertically upward from the origin of a reference frame. The rock reaches the peak of its trajectory and then it

Tema [17]

Answer:

The acceleration of the rock is negative throughout the whole motion. (TRUE)

The acceleration of the rock is zero at the peak of the trajectory (FALSE)

The velocity of the rock is positive throughout the whole motion (FALSE)

The position of the rock is positive or zero throughout the whole motion (TRUE)

The velocity of the rock is positive throughout the whole motion (FALSE)

Explanation:

1)The acceleration of the rock is negative throughout the whole motion. (TRUE)

Using the upward direction as positive

Then, The acceleration of the rock is negative throughout the whole motion.

2)The acceleration of the rock is zero at the peak of the trajectory.(FALSE)

Only the velocity can be zero at the peak the trajectory, the acceleration is not zero

3)The velocity of the rock is positive throughout the whole motion (FALSE)

Using the upward direction as positive, The velocity of the rock is only positive when going in upward direction and vice versa

4)The position of the rock is positive or zero throughout the whole motion (TRUE)

When the rock get down it will have a zero position, then when it get to the peak it will have positive position

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4 years ago