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4 years ago

What are two ways in which waves erode the land

1 answer:

4 0

One major way erode waves the land is by water on the land itself, moving dirt, sand, etc. Another way is by the salt which can break down severl elements

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Bert strikes a cue ball of mass 0.17 kg, giving it a velocity of 3 m/s in the x-direction. When the cue ball strikes the eight b

Anuta_ua [19.1K]

Answer:

The velocity of the cue ball after collision is -2.13 m/s and the velocity of the eight ball after collision is 2.06 m/s

Explanation:

Let m₁ = mass of cue ball = 0.17 kg, m₂ = mass of eight ball = 0.16 kg, v₁ = initial speed of cue ball = 3 m/s, v₂ = initial speed of eight ball = 0 (since it is initially at rest), v₃ = final speed of cue ball, v₄ = final speed of eight ball.

Since the cue ball and eight ball are deflected at an angle to the horizontal, we resolve their final velocity into its components in the x and y direction and then apply it to the law of conservation of momentum.

From the law of conservation of momentum,

In the x- direction

m₁v₁ + m₂v₂ = -m₁v₃cos40 + m₂v₄cos45 (the third quantity is negative since the cue ball moves 40° in the opposite direction)

0.17 × 3 = -0.17v₃cos40 + 0.16v₄cos45

0.51 = -0.130v₃ + 0.113v₄

-0.130v₃ + 0.113v₄ = 0.51 (1)

In the y - direction

0 = m₁v₃sin40 + m₂v₄sin45 (since our initial momentum in the y-direction is zero)

m₁v₃sin40 = -m₂v₄sin45

0.17v₃sin40 = -0.16v₄sin45

0.1093v₃ = -0.113v₄

v₄ = -0.1093v₃/0.113 (2)

Substituting (2) into (1), we have

-0.130v₃ + 0.113 × -0.1093v₃/0.113 = 0.51

-0.130v₃ -0.1093v₃ = 0.51

-0.239v₃ = 0.51

v₃ = 0.51/-0.239 = -2.134 m/s ≅ -2.13 m/s

Substituting v₃ into (2), we have

v₄ = -0.1093(-2.134)/0.113 = 2.064 m/s ≅ 2.06 m/s

So, the velocity of the cue ball after collision is -2.13 m/s and the velocity of the eight ball after collision is 2.06 m/s

8 0

3 years ago

In a neutralization reaction a metal and a non-metal are the reactants. True or false.

vlada-n [284]

False...
Acid and base (alkali) are reactants
Acids are basically HYDRATES of non metals and alkalis or bases are metal HYDRATES.

4 0

3 years ago

It is advised not to hold the thermometer by the bulb while reading it

Evgesh-ka [11]

yes is is true cuz when you hold the thermometer by a bulb the heat coming from the bulb will increase the thermometer

6 0

3 years ago

An object moves along the x-axis. Its position is given by the equation y( X = 4t^2 - 41t+ 78 \). Find the position of the

prohojiy [21]

The object changes direction when its velocity changes sign. You can get the velocity function by differentiating the position function with respect to time t :

x(t) = 4t ² - 41t + 78

→ v(t) = dx(t)/dt = 8t - 41

Solve v(t) = 0:

8t - 41 = 0

8t = 41

t = 41/8 = 5.125

Just to confirm that the velocity indeed changes sign:

• Pick any time before this one to check the sign of v :

v (0) = 8•0 - 41 = -41 < 0

• Pick any time after and check the sign again:

v (6) = 8•6 - 41 = 7 > 0

Now just find the position at this time:

x (5.125) = -433/16 = -27.0625

which means the object is 27.0625 units on the negative x-axis.

You can also do this without calculus by completing the square in the position function:

4t ² - 41t + 78 = 4 (t ² - 41/4 t ) + 78

… = 4 (t ² - 2• 41/8 t + (41/8)² - (41/8)²) + 78

… = 4 (t ² - 2• 41/8 t + (41/8)²) - 4•1681/64 + 78

… = 4 (t - 41/8)² - 433/16

which describes a parabola that opens upward. When t = 41/8 = 5.125, the quadratic term vanishes and the turning point of the parabola occurs at a position of -433/16 units.

7 0

3 years ago

URGENT: true or false: liquids can be poured from one container to another because there are no attraction forces between atoms

sashaice [31]

Answer:

False

Explanation:

It's common sense

4 0

3 years ago

Read 2 more answers