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3 years ago

When a planet orbits the Sun, the

Physics

2 answers:

Nikitich [7]3 years ago

8 0

I think it’s A not sure but sorry if not correct!

Anna [14]3 years ago

6 0

I’m not sure I think it’s A

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How is the mass number calculated for an element?

natali 33 [55]

<span># of protons + # of neutrons = atomic mass</span>

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4 years ago

A student made the table shown to list some contact and non-contact forces. Examples of Forces Contact Forces Non-Contact Forces

aleksandr82 [10.1K]

Answer:

the second one is incorrect

Explanation:

I am smart and took the test

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3 years ago

Two balls with equal masses, m, and equal speed, v, engage in a head on elastic collision. what is the final velocity of each ba

Allushta [10]

The collision is elastic. This means that both momentum and kinetic energy are conserved after the collision.

- Let's start with conservation of momentum. The initial momentum of the total system is the sum of the momenta of the two balls, but we should put a negative sign in front of the velocity of the second ball, because it travels in the opposite direction of ball 1. So ball 1 has mass m and speed v, while ball 2 has mass m and speed -v:
$p_i = p_1-p_2 = mv-mv =0$
So, the final momentum must be zero as well:
$p_f = 0$
Calling v1 and v2 the velocities of the two balls after the collision, the final momentum can be written as
$p_f = mv_1 + mv_2 = 0$
From which
$v_1 = -v_2$

- So now let's apply conservation of kinetic energy. The kinetic energy of each ball is $\frac{1}{2} mv^2$ . Therefore, the total kinetic energy before the collision is
$K_i = \frac{1}{2} mv^2 + \frac{1}{2} mv^2 = mv^2$
the kinetic energy after the collision must be conserved, and therefore must be equal to this value:
$K_f = K_i = mv^2$ (1)
But the final kinetic energy, Kf, is also
$K_f = \frac{1}{2} mv_1^2 + \frac{1}{2}mv_2^2$
Substituting $v_1 = -v_2$ as we found in the conservation of momentum, this becomes
$K_f = mv_2 ^2$
we also said that Kf must be equal to the initial kinetic energy (1), therefore we can write
$mv_2^2 = mv^2$

Therefore, the two final speeds of the balls are
$v_2 = v$
$v_1 = -v_2 = -v$

This means that after the collision, the two balls have same velocity v, but they go in the opposite direction with respect to their original direction.

8 0

3 years ago

SONAR was developed during World War II, to find submarines. Submarines were sneaking up on ships underwater and releasing torpe

Reika [66]

As long as you describe the chemical reactions within the torpedo and explain how torpedoes advanced modern warfare.

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4 years ago

Read 2 more answers

Light of wavelength 578.0 nm is incident on a narrow slit. The diffraction pattern is viewed on a screen 62.5 cm from the slit.

yaroslaw [1]

Answer:

$80.6\mu m$

Explanation:

When light passes through a narrow slit, it produces a diffraction pattern on a distant screen, consisting of several bright fringes (constructive interference) alternated with dark fringes (destructive interference).

The formula to calculate the position of the m-th maximum in the diffraction pattern produced in the screen is:

$y=\frac{m\lambda D}{d}$