Ahockey puck is set in motion across a frozen pond. if ice friction and air resistance are neglected, the force
required to keep the puck sliding at constant velocity is
a) the weight of the puck divided by the mass of the puck.
b) the mass of the puck multiplied by 9.8 meters per second per second.
c) qual to the weight of the puck.
d) zero newtons.
e) none of these.

D) Zero newtons

Explanation:

According to the First Newton Law:

"An object keeps its state of rest or its state of uniform motion at constant velocity, when the net force acting on the object is zero"

In this problem, the hockey puck is initially set in motion. While in motion, there are no ice friction and air resistance acting on it: this means that the net force acting on it is zero, so there is no need for an additional force to keep the puck in its state of uniform motion at constant velocity, according to the abovementioned law.

Therefore, the correct answer is

D) zero newtons

from 1609, galileo galilei used the recently invented telescope to observe the sun, moon and planets. he saw the mountains and craters of the moon, and for the first time revealed the planets to be worlds in their own right. galileo also provided strong observational evidence that planets orbited the sun.

his discoveries about the moon, jupiter's moons, venus, and sunspots supported the idea that the sun - not the earth - was the center of the universe, as was commonly believed at the time.galileo turned his gaze toward venus, the brightest celestial object in the sky - other than the sun and the moon.

electric field is a function of 1/r^2

yes, the force per unit charge for a point charge is inverse square law.