This is the correct answer to your question, "BC shows zero acceleration, and CD shows negative acceleration".
Answer:
Horizontal acceleration is 0 in a projectile motion
Explanation:
first we have to find the horizontal velocity
15cos40 = 11.49ms^-1
and then use the following equation to find the distance
Answer:
(c) always equal to the weight of the liquid displaced.
Explanation:
Archimedes principle (also called physical law of buoyancy) states that when an object is completely or partially immersed in a fluid (liquid, e.t.c), it experiences an upthrust (or buoyant force) whose magnitude is equal to the weight of the fluid displaced by that object.
Therefore, from this principle the best option is C - always equal to the weight of the liquid displaced.
Answer:
A
Explanation:
The electric field = 1000N/C
Using the formula
F = q/4πeD^2 where F is the force experience by a charge body brought from infinity to D and e is the field constant in C/N.m^2 and D is the distance from the uniform field
1000 = q/4πeD^2
Make q subject of the formula
1000*(4πeD^2) = q
If the force changes to 2000 then equation changes to:
2000 = q /4πeD1^2 where D1 is the new distance
Substitute q in equation 2
2000 = 1000*(4πeD^2) / 4πeD1^2
Cancel 4πe
2000 = 1000 * D^2 / D1^2
Cross multiply and make D1^2 subject of the formula
D1^2 = 1000D^2/ 2000
D1^2 = D^2/2
Take square root of both side
D1 = √(D^2/2) = D / √2
It is because of the high specific heat of water.
Specific heat is the amount of heat needed to change the temperature of unit mass of a substance by one degree.
Specific heat of water is 4.186 kJ/kg K and that of air is 1 kJ/kg K. Thus, a given amount of heat will cause more change in the temperature of air than that of water.