Number of protons = atomic number (12)
Mass Number = 0.25
mass number = number of protons + number of neutrons
Number of neutrons = mass number - number of protons
Number of neutrons = 0.25 - 12
number of neutrons = - 11.75
Answer:
Electron must be placed at a distance of 2.69 ×10^5 m in the direction of positive y-axis.
Explanation:
Charge on electron = e = -1.6 × 10^-19 C
Mass of electron = m = 9.1 × 10^-31 kg
Charge at origin = q = -0.45 nC
According to given condition in the question:
Fe = Fg
kq1q2/r^2 = mg
(9 × 10^9)( -1.6 × 10^-19)( -0.45n)/r^2 = (9.1 × 10^-31)(9.8)
r = √7.2 ×10^10
r = 2.69 ×10^5 m in the positive y-axis direction
Answer:
zero velocity
Explanation:
if the v-t graph is parallel to the time axis its mean body has covered no path in other words the body is at rest so the velocity of the body should be zero
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