Answer:
Chemical
Explanation:
When sodium reacts with water, sodium, being an alkali, rips away electrons from water and creates an explosion. This happens because of the chemical properties of sodium. Hope this helps!
Answer:
60 mph
Explanation:
Average speed is distance divided by time.
v = d / t
v = 60 mi / 1 hr
v = 60 mph
Six.
If you want to double the force, you need to double either v or B. Changing the angle does not give totally predictable results. The formula is
F = q*v*B Sin(theta) altering theta isn't linear. Doubling B is. The answer is A
Seven
Seven is correct. The poles on a magnet is where the field is the strongest.
Eight
I can't really answer this question. Much depends on where you are and whether or not the readings are true or erratic. It is taking only one parameter into account where in reality there are many. My guess would be that as you move up the longitude the angle increases. So the answer would be near but not at the north pole. Seek out your notes for confirmation.
Answer:
( 24.19 / 10.06 )
Explanation:
starting speed = 20m/s
direction = 41 degrees from due east
after 20 seconds
bus speed = 45m/s
direction = 56 degrees from due east
calculate the angle of the vector that represents the change in the velocity of the bus
change in velocity : ΔV = Vf - Vi
Vf = Vf ( cos βi + sinβj )
= 45m/s ( cos 56 i + sin56 j )
= 25.16 i + 37.31 j
Vi = Vi ( cos ∝ i + sin ∝ j )
= 20 m/s ( cos 41 i + sin 41 i )
= 15.10 i + 13.12j
Hence the change in velocity ΔV ( Vf - Vi )
= 10.06 i + 24.19 j
the angle in degrees ( ∅ ) = ( 24.19 / 10.06 )
The amount left of a given substance can be calculated through the equation,
A = (A0) x 0.5^n/h
From the given scenario,
A/A0 = 0.75 = 0.5*(60/h)
The value of h from the equation is 144.565 minutes.