Explanation:
Charge of electron in He, 
Charge of proton in He, 
Distance between them, 
We need to find the electric force between them. It is given by :
Since, there are two protons so, the force become double i.e.
So, the correct option is (c). Hence, this is the required solution.
Answer:
Explanation:
The dart will go forward horizontally with velocity of 19 m/s. It will also fall downwards with initial velocity of zero and gravitational acceleration of 9.8 m/s².
Distance PQ covered by the dart can be calculated using the following formula.
s = ut + 1/2 at²
u is initial velocity , a is acceleration and t is time.
Putting the values
s = 0 + 1/2 x 9.8 x .19²
= .1769 m
= 17.69 cm.
City 4 because it is closer to the equator
Gravity is 9.81m/s^2 on earth F=m×g
100N=(x)kg×9.81m/s^2
x=10.19kg or more than 22lbs
