A 70kg astronaut is floating in space. If she throws a 2kg wrench at a velocity of 10 m/s to the left, how fast and in what direction will she travel?
a. 1.4 m/s
b. 0.20 m/s
c. 0.28 m/s
d. 0.57 m/s

Point charges q1 = 51 µc and q2 = −27 µc are placed 1.0 m apart, with q2 on the right. what is the force (in n) on a third charge q3 = 19 µc placed midway between q1 and q2? (assume the positive direction is to the right. indicate the direction with the sign of your answer.)

Charge is distributed along the entire x-axis with uniform density λ. how much work does the electric field of this charge distribution do on an electron that moves along the y-axis from y = a to y = b? (use the following as necessary: a, b, ε0, λ, and q for the charge on an electron.)

What equation is used to calculate the weight of an object on a plant ?