A 60 kg block of ice is being pulled along a well-waxed floor by a rope tied around its center. The rope is taut at an angle of 55° above the horizontal. If the block accelerates at a rate of 1.8 m/s?, and friction is negligible, determine
normal force necessary to support the block of ice.

What is a subatomic particle with a negative charge and very little mass?

How many neutrons does plutonium -196 with an atomic number of 78.

Abird flies directly overhead from where you stand at an altitude of 300.0 m and at a speed horizontal to the ground of 20.0 m/s. the bird has a mass of 2.0 kg. the radius vector to the bird makes an angle \thetaθ with respect to the ground. the radius vector to the bird and its momentum vector lie in the xyxy-plane. what is the bird’s angular momentum about the point where you are standing?