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3 years ago

14

If the wavelength of a set of waves is 20 feet long, how deep is the wave base?

1 answer:

Viktor [21]3 years ago

6 0

10ft below the surface.

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A plastic block of mass 0.20.2kg is initially at rest on a horizontal frictionless surface. A bullet of mass 1212 g is fired wit

Juli2301 [7.4K]

Answer:

94.29619%

Explanation:

$m_1$ = Mass of bullet= 0.012 kg

$m_2$ = Mass of block = 0.2 kg

$u_1$ = Initial Velocity of bullet= 550 m/s

$u_2$ = Initial Velocity of block = 0 m/s

$v_1$ = Final Velocity of bullet = 20 m/s

$v_2$ = Final Velocity of block

As the linear momentum of the system is conserved

$m_1u_1+m_2u_2=m_1v_1+m_2v_2\\\Rightarrow v_2=\dfrac{m_1u_1+m_2u_2-m_1v_1}{m_2}\\\Rightarrow v_2=\dfrac{0.012\times 550+0.2\times 0-0.012\times 20}{0.2}\\\Rightarrow v_2=31.8\ m/s$

Change in kinetic energy is given by

$\Delta K=\dfrac{1}{2}(m_1u_1^2-m_1v_1^2-m_2v_2^2)\\\Rightarrow \Delta K=\dfrac{1}{2}(0.012\times 550^2-0.012\times 20^2-0.2\times 31.8^2)\\\Rightarrow \Delta K=1711.476\ J$

Percentage change is given by

$\dfrac{\Delta K}{\dfrac{1}{2}m_1u_1^2}\times 100=\dfrac{1711.476}{\dfrac{1}{2}0.012\times 550^2}\times 100=94.29619\ \%$

The percent of the initial kinetic energy of the bullet block system is lost during the collision is 94.29619%

4 0

3 years ago

Are there any parallels that happened during the oxygen catastrophe and modern-day climate change?

TiliK225 [7]

Answer:

kjnrkjvkjvkjrv

Explanation:

3 0

4 years ago

Read 2 more answers

Ruby was training for a race at the high school track. She took her dog walked 2250 meters in 15 minutes. Calculate the average

Sedbober [7]

Answer:

Average speed $= 2.5$ meter per second

Explanation:

Given

The total distance walked $= 2250$ meters

The total time taken to walk $2250$ meters is $15$ minutes

In one minute there are $60$ seconds

As we know Average speed is equal to total distance travelled divided by total time taken

Hence,

Average speed

$\frac{2250}{15*60} \\2.5$ meter per second

4 0

3 years ago

a subsrance has an atomic number of 80. How many protons and electrons do atoms of the substance have? what is the subsance?

valentinak56 [21]

Answer:

The substance is Mercury. It has 80 electrons revolving around nucleus and 80 protons inside nucleus.

Explanation:

Atomic number of atom represent the number of electrons and protons of the atom. Thus,

Number of electrons = number of protons = 80

The atom which has atomic number 80 in the periodic table is Mercury.

5 0

3 years ago

Which travels along a surface separating two media?

Tom [10]

I think it would be answer B. a surface wave

5 0

4 years ago

Read 2 more answers