Hey there,
Question: "<span>What is the half life of Strontium-90? Explain your answer"
Answer: </span>28.8 years / <span>Strontium-90 has 52 neutrons and 38 protons. </span>
Answer:
A) If the paintball stops completely the magnitude of the change in the paintball’s momentum is
B) If the paintball bounces off its target and afterward moves in the opposite direction with the same speed, the change in the paintball’s momentum is
C) A paintball bouncing off your skin in the opposite direction with the same speed hurts more than a paintball exploding upon your skin because of the strength exerted is twice than if it explodes.
Explanation:
Hi
A) We use the formula of momentum , so we have
B) We use the same formula above, then due we have a change of direction at the same speed, therefore the change in the momentum is the double so
.
C) The average strength of the force an object exerts during impact is determined by the amount the object’s momentum changes. therefore
, as we don't have any data about the impact time but we know momentum is twice, time does no matter and strength is twice too.
The magnitude of the electric field for the bead to hang suspended in air is 9.19×10⁵V/m and the field is directed downwards.
If <em>n</em> electrons each of charge <em>e</em> are added to the bead, the total charge <em>q</em> on the bead is given by
Substitute 1.0×10¹⁰ for n and 1.6×10⁻¹⁹C for e.
The bead ha a negative charge of magnitude 1.6×10⁻⁹C.
The bead has a mass m and its weight mg is directed downwards. The bead can be balanced in an electric field of strength E if the force it experiences due to the electric field is directed upwards and is equal to the magnitude of its weight. This is shown in the diagram attached.
For equilibrium,
Rewrite the expression for E.
Substitute 0.15 g = 0.15×10⁻³kg for m, 9.8 m/s² for g and 1.6×10⁻⁹C for q.
The magnitude of the electric field required to balance the bead is <u>9.19×10⁵V/m.</u>
The bead is negatively charged. For the bead to experience a force in the upward direction, the electric field is to be directed down wards.
The electric field is directed downwards.
By idea gas equation we can say
here P = pressure
V = volume
n = number of moles
R = Avagadro gas constant
T = temperature
So from above expression you can see that for constant number of moleswe can say
So finally the volume will be 43.9 L
Answer: B. V/b
Explanation: