Answer:
N = 731 N
Explanation:
From the question, we recall the following
The mass m = 250 kg
The initial kinetic energy T₁ = 0
The initial kinetic energy T₂ = 1/2 mv²
velocity = v at B
thus,
The work is carried out because of the weight
so,
U₁→₂ = W * h
= (250 * 9.81) * (27 m - 27 cos 40 m)
which is =15491.95 N.m
From the energy principle - from work
T₁ + U₁→₂ = T₂
We can say,
0 + 15491.95 N.m = 1/2 * 250 kg * v²
v = 11.13 m/s
Now we solve for the normal acceleration
aₙ = v²ρ = (11.13 m/s)²/27 m
aₙ = 4.588 m/s²
Now, by applying the second law
∑Fy = -maₙ
or we say that, N - W cos 40° = -maₙ
so,
N = 250 * 9.81 N cos 40° - 250 kg * 4.588 m/s²
Therefore N = 731 N
If you go to the right along the periodic table, electronegativity increases.
So the larger the column number, the greater the electronegativity.
-Lithium has lowest as it is in the 1st column
-Beryllium (2nd column)
-Boron s (13th column)
-Nitrogen (15th column)
By reading the fine details of the question, carefully and analytically, I have determined that there's no list of modifications to choose from.
The strength of the magnetic field of a solenoid depends on the electric current in its coil windings, the number of wire turns in its coil windings, and the material in its core.
In order to <em>DE</em>crease the strength of its magnetic field, any one or more of these steps could do the job:
-- DEcrease the electric current in its coil windings. This can be accomplished by decreasing the voltage of the power source that energizes the coil, and/or increasing the resistance of the wire in the coil.
-- DEcrease the number of wire turns in the coil.
-- If the solenoid has anything in its core, change the core to something with a lower magnetic 'permeability'. An Iron core will produce the greatest magnetic field strength. Air, vacuum, or NO core will produce the lowest magnetic field strength.
Answer:
The correct solution is "122.2211".
Explanation:
Given:
deceleration,
a = 22 ft/sec²
Initial velocity,
Now,
Now,
Final velocity,
Initial velocity,
hence,
⇒
By putting the values, we get
Given that,
Mass of a water balloon, m = 1 kg
It comes downward an experience a 4.9 N air resistance as it approaches the ground.
To find,
The acceleration of the water balloon when it experiences this air resistance.
Solution,
Let the acceleration be a.
The net force acting on it will be :
The force is also given by :
F = ma
So, the acceleration of the water balloon is .