Divide (25,000) by (the number of miles you can walk in 1 hour).
The answer you get is the number of hours it would take you to walk around the Earth once, IF you were able to walk on water too.
The answer would be "velocity will stay in the same direction." Since the ball is going in the same the ball is still going straight but just right. Many people get confused over velocity and speed, speed it the average amount on how fast a object is going and velocity is the amount of force a object has when it has speed. So, in this case since how the ball is going straight but just right it would stay in the same direction.
Hope this helps!
a) the number of protons is more than the electrons
b)
Explanation:
The net electric charge on the ball is
This electric charge is given by the algebraic sum of the charge of the protons and of the charge of the electrons.
The charge of one proton is:
While the charge of one electron is
So the net charge on the metal ball will be given by
where
is the number of protons
is the number of electrons
So we find:
This means that the number of protons is more than the electrons.
b)
In this case, we want to make the ball neautral, so we have to remove a net charge of Q' such that the new charge is zero:
This implies that the charge that we must remove is
To do that (and to make the ball losing mass at the same time), we have to remove protons, since they have positive charge.
The number of protons that must be removed is:
The mass of one proton is
Therefore, the total mass that must be removed from the ball is
Answer:
i) O m/s² as velocity is constant
ii) 20m/s
iii)Hint:Calculate the area of the graph,that is;below the line, for the first 15 seconds only
Hope this helps.
Answer:
Machine used 392 MJ energy as mechanical energy.
Explanation:
Efficiency(e) is defined as the ratio of the work done by the machine to the energy provided to the machine.
.....(1)
The efficiency of the machine is also given by the relation :
.....(2)
Here T(low) and T(high) denotes the temperature in kelvin.
According to the problem, T(low) = 35⁰ C = 35 + 273 = 308 K
T(high) = 330⁰ C = 330 +273 = 603 K
Substitute the values of T(low) and T(high) in the equation (2).
e = 0.49
According to the problem, Energy Given = 800 MJ
Substitute the value of efficiency(e) and Energy Given in the equation (1).
Energy used = 0.49 x 800 MJ = 392 MJ