Lithium metals reacts slowly with water to form a colourless solution of lithiums hydroxide (LiOH) and hydrogen gas (H2). The resulting solution is basic because of the dissolved hydroxide. The reaction is exothermic, but the reaction is slower than that of sodium (immediately below lithium in the periodic table)
Answer:
in series, R1 + R2 = RT
6 + R2 = 10
R2 = 4
IN SERIES COMBINATION,
CURRENT REMAINS THE SAME.
IT = VT/RT
IT = 20/10
= 2A
I remains the same in series, hence
I1 = 2A
I2 = 2A
V1 = I R1
= 2 x 6
= 12V
V2 = I R2
= 2 X 4
= 8V
P1 = I2R
= 2 X 2 X 6
= 24 W
P2 = I2R
= 2X 2X 4
= 16 W
TOTAL POWER = P1 + P2
= 40W
Take Sally's position to be the origin, and up-the-ramp to be the positive direction. The ball travels a distance <em>x</em> in time <em>t</em> of
<em>x</em> = <em>u</em> <em>t</em> + 1/2 (- 3.7 m/s²) <em>t</em>²
where <em>u</em> is the ball's initial velocity.
Its velocity <em>v</em> at time <em>t</em> is
<em>v</em> = <em>u</em> + (- 3.7 m/s²) <em>t</em>
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Let <em>T</em> be the time it takes for the ball to reach the second person 19.6 m up the ramp. At this time, the ball attains a velocity of 4.9 m/s, so that
4.9 m/s = <em>u</em> + (- 3.7 m/s²) <em>T</em>
<em>T</em> = (<em>u</em> - 4.9 m/s) / (3.7 m/s²)
Substitute this into the distance equation, with <em>x</em> = 19.6 m, and solve for <em>u</em> :
19.6 m = <em>u</em> (<em>u</em> - 4.9 m/s) / (3.7 m/s²) + 1/2 (- 3.7 m/s²) ((<em>u</em> - 4.9 m/s) / (3.7 m/s²))²
<em>u</em> ≈ 13 m/s
According to the United States Department of Agriculture:
<span>"The compass direction that the slope of a land surface faces toward (e.g., north, northwest, south). (After Soil Conserv. Soc. Amer. 1970)"
I hope my answer has come to your help. God bless and have a nice day ahead!</span>