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3 years ago

What happens to beaches over time?

Physics

2 answers:

Rama09 [41]3 years ago

7 0

the answer is d i took the test be cause i go to a k12 onlie school

vitfil [10]3 years ago

3 0

Answer:

Option (D)

Explanation:

The beaches are defined as the landform that is oriented along the side of the large water bodies such as seas and oceans. They are dominantly comprised of sand and other rock particles such as pebbles and gravels.

These beaches are often affected by factors such as, the change in the sea level, that are caused due to the tidal effect, and the occurrence of storms and tsunamis.

The shoreline of the beach shifts towards the inland areas when the sea level rises and the opposite happens when the sea level drops. They are suddenly affected when a storm occurs, eroding the sand particles towards or away from the water body.

Thus, the beaches or shorelines are continuously affected due to the above factors.

Hence, the correct answer is option (D).

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Reflected waves change their wavelength by ______ when reflected.

natita [175]

Answer:

i think its c

Explanation:

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2 years ago

In general, which type of compound tends to have the lowest melting point?

Liono4ka [1.6K]

A. Molecular solids tend to have lower melting points than Ionic so it would be Ionic if it weren't for Molecular.

5 0

4 years ago

Read 2 more answers

During the deceleration of an ascending elevator, the normal force on the feet of a passenger is _____ her weight. During the de

gizmo_the_mogwai [7]

Answer: Smaller than ; larger than

Explanation:

When the elevator is moving in the upward direction, then the force acting on it is negative in nature because of

N= mg +ma, (g is gravity and a is acceleration)

here ma is negative so the N= mg-ma

Hence, it feels smaller than its original weight.

When the elevator is moving downward , then the force acting will be positive in nature

N= mg+ma,

here ma will be positive so it feels larger the original weight of passenger.

7 0

3 years ago

The period (T) of an oscillating wave is 1/5s. What happens to the frequency (f) of the wave if T increases to 1/2s

Anastasy [175]

Frequency = 1/T
as the 5 is reduced, frequency is increase.
as 1 whole wave travels through a point in a lesser time now

6 0

3 years ago

Henry, whose mass is 95 kg, stands on a bathroom scale in an elevator. The scale reads 830 N for the first 3.8 s after the eleva

Delicious77 [7]

Answer:

v= 4.0 m/s

Explanation:

When standing on the bathroom scale within the moving elevator, there are two forces acting on Henry's mass: Normal force and gravity.
Gravity is always downward, and normal force is perpendicular to the surface on which the mass is located (the bathroom scale), in upward direction.
Normal force, can adopt any value needed to match the acceleration of the mass, according to Newton's 2nd Law.
Gravity (which we call weight near the Earth's surface) can be calculated as follows:

$F_{g} = m*g = 95 kg * 9.8 m/s2 = 930 N (1)$

According to Newton's 2nd Law, it must be met the following condition:

$F_{net} = F_{g} -F_{n} = m*a\\ F_{net} = 930 N - 830 N = 100 N = 95 Kg * a$

As the gravity is larger than normal force, this means that the acceleration is downward, so, we choose this direction as the positive.

Solving for a, we get:

$a =\frac{F_{net} }{m} =\frac{100 N}{95 kg} = 1.05 m/s2$

We can find the speed after the first 3.8 s (assuming a is constant), applying the definition of acceleration as the rate of change of velocity:

$v_{f} = a* t = 1.05 m/s * 3.8 m/s = 4.0 m/s$

Now, if during the next 3.8 s, normal force is 930 N (same as the weight), this means that both forces are equal each other, so net force is 0.
According to Newton's 2nd Law, if net force is 0, the object is either or at rest, or moving at a constant speed.
As the elevator was moving, the only choice is that it is moving at a constant speed, the same that it had when the scale was read for the first time, i.e., 4 m/s downward.

3 0

3 years ago