A9.0 kg rock starting from rest free-falls through a distance of 50.0 m. assuming no air resistance, find the amount of momentum that is transferred from the rock to earth as it collides with earth’s surface. what is the change in velocity of earth as a result of this momentum change? the earth’s mass is . show all your work, assuming the rock–earth system is closed.

Acurve connects the data points that are plotted. (physical science chapter 11 motion)

Astudent pushes on a 20.0 kg box with a force of 50 n at an angle of 30° below the horizontal. the box accelerates at a rate of 0.5 m/s2 across a horizontal floor. what is the value of the normal force on the box? 200 n 243 n 156 n 225 n

Asolid round steel rod 6.25 mm in diameter and 375 mm long is rigidly bonded to the end of solid square brass rod 25 mm on a side and 300 mm long. the geometric axes of the bare are along the same line. an axial tensile force of 5.4 kn is applied at the extreme ends of the assembly. for steel e = 200 gpa and for brass e = 90 gpa. determine the total elongation for the assembly.