Light waves don’t involve the motion of matter. Light waves are different from mechanical waves, because they can travel through a vacuum. Light waves are just one type of electromagnetic wave.
Answer:
left hand: 133 N upward
right hand: 83N downward
Explanation:
10 cm = 0.1m
Let g = 10m/s2. The pole gravity force would be 
. Suppose the pole mass distribution is uniform, this means the center of mass is at its geometric center, aka 5/2 = 2.5m from the top end.
In order for the system to stay balanced, the total net force and net moment must be 0
where 
are the forces exerted by his left and right hand, respectively.
We will pick his right hand (0.1 m from the top end) as moment pivot point. The total moment generated by pole gravity and his left hand must be 0
Distance (or moment arm length) from pole center to his right hand is 
Moment generated by gravity around his right hand is: 
counter-clockwise
Distance (or moment arm length) from left hand to his right hand is 
Moment generated by force from his left hand around his right hand is: 
clockwise
Since the total moment must be 0, the clockwised-direction moment = counterclockwised-direction moment:
upward
Therefore, the force exerted by his right hand must be 50 – 133 = -83 N or 83N downward
Answer:
680 Kg.m/s
Explanation:
Mass of player; m_p = 105 kg.
Speed of player before Collision; v_pi = 8.5 m/s
Mass of referee; m_r = 85 kg
Speed of referee before collision; v_ri = 3.5 m/s
Speed of referee after collision; v_rf = 6 m/s
From conservation of momentum,
Initial momentum = final momentum
Thus;
(m_p × v_pi) + (m_r × v_ri) = (m_p × v_pf) + (m_r × v_rf)
Where (m_p × v_pf) is the momentum of the player after collision.
Thus, Plugging in the relevant values, we have;
(105 × 8.5) + (85 × 3.5) = (m_p × v_pf) + (85 × 6)
(m_p × v_pf) = (105 × 8.5) + (85 × 3.5) - (85 × 6)
(m_p × v_pf) = 680 Kg.m/s
Answer:
When the Moon passes between Sun and Earth, the lunar shadow is seen as a solar eclipse on Earth. When Earth passes directly between Sun and Moon, its shadow creates a lunar eclipse. ... But lunar eclipses do not occur every month because the Moon's orbit is tilted five degrees from Earth's orbit around the Sun.
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