The atomic mass of sodium (Na) is 22.98977
Answer:
the impulse and change in momentum of the football is 18.83 N/s.
Explanation:
Given;
applied force, F = 420 N
time of force action, t = 22.3 s
The impulse and change in momentum of the football is calculated as;
J = ΔP =
where;
J is the impulse
ΔP is the change in momentum
J = ΔP =
Therefore, the impulse and change in momentum of the football is 18.83 N/s.
Answer:
450 pm
Explanation:
The electron is held in orbit by an electric force, this works as the centripetal force. The equation for the centripetal acceleration is:
a = v^2 / r
The equation for the electric force is:
F = q1 * q2 / (4 * π * e0 * r^2)
Where
q1, q2: the electric charges, the charge of the electron is -1.6*10^-19 C
e0: electric constant (8.85*10^-12 F/m)
If we divide this force by the mass of the electron we get the acceleration
me = 9.1*10^-31 kg
a = q1 * q2 / (4 * π * e0 * me * r^2)
v^2 / r = q1 * q2 / (4 * π * e0 * me * r^2)
We can simplify r
v^2 = q1 * q2 / (4 * π * e0 * me * r)
Rearranging:
r = q1 * q2 / (4 * π * e0 * me * v^2)
r = 1.6*10^-19 * 1.6*10^-19 / (4 * π * 8.85*10^-12 * 9.1*10^-31 * (7.5*10^5)^2) = 4.5*10^-10 m = 450 pm
The correct answer is velocity
Velocity includes speed, time, and direction, making it a vector unit. Velocity shows at what speed something is moving for how long in what direction, which is what happens here.
Answer:
Velocity of Sedan = 21 m/s
Velocity of SUV = 12 m/s
Explanation:
As we know that deceleration due to friction force is given as
so we have
now the two cars comes to rest at a point which is at position of 5.39 m West and 6.43 m South
so net displacement of the car is given as
now the velocity of the two cars just after the impact is given as
direction of the motion is given as
South of West
now we can use momentum conservation as there is no external force on it
Momentum conservation in North to south direction
Similarly momentum conservation towards West direction