Answer: C
14.75g
Explanation:
Given that the half life time = 60.5s
Let No = initial mass = 59g
N = decayed mass
At time t = 0, No = 59g
At time t = 60.5s,
N = No/2 = 59/2
= 29.5g
At time t = 121
N = 29.5/2 = 14.75g
Therefore N = 14.75g
Force is mass times acceleration same as F= m x a ; this means a object with a larger mass needs a stronger force to be moved along at the same acceleration as an object with a small mass.
The momentum and impulse states that the change in momentum of an object is equal to the impulse applied to it. the equation for this one would be; F= m x a same as the force and acceleration equation.
I don't know if this really helped, but I tried my best so hopefully you get it, if not tell me I will try to explain it more. :)
Answer: figure A
Explanation:
Electric field lines point away from positive charges (like charges repel) and towards negative charges (unlike charges attract). ... Field lines do not touch or cross each other. Field lines are drawn perpendicular to a charge or charged surface. The greater the magnitude of the charge, the stronger its electric field.
Figure B shows a positive charge but has a negative field line so that’s wrong.
Figure C shows a negative charge but has a positive field line so that’s wrong.
Figure D shows a negative charge but has no perpendicular field lines so that’s wrong.
The weight of an object is the strength of the gravitational force on it.
So if the gravitational force changes, the object's weight changes.
