In Fig. 21-25,four particles form a square. The charges are q1 # q4 # Q and q2 # q3 # q. (a) What is Q/q if the net electrostatic
force on particles 1 and 4 is zero? (b)
Is there any value of q that makes the
net electrostatic force on each of the
four particles zero? Explain.

Determine the age of a fossil if it had only one eighth of its original carbon-14 content remaining?

Suppose a comet has an orbital period of 309.1 years around the sun. what is it’s average distance from the sun?

Awater balloon launcher uses an elastic band with a spring constant of 115 n/m to use thee launcher you stretch thee band back with a balloon n it the water balloons have a mass of 1.3 kg a) if you stretch the band by 0.8 m, what elastic force will the band exert? b) with the band stretched 0.8 m, how much elastic potential energy is stored in the spring? c) if you release the band, it pushes forward. what is the kinetic energy of the balloon when it reaches the natural length of the band? d) what is the speed of the balloon when it reaches the natural length of the band?