Arailroad tie weights 920 n and is 2.6 m long. how much force is required to: pick it up off the ground? lift one end and rotate it uniformly? lift it 0.6 m from one end, pivoting around the opposite end

Work out sian speed for the first 30 minutes of her journey. give your answer in km/h.

The particle p starts from rest at point a at time t = 0 and changes its speed thereafter at a constant rate of 2.8g as it follows the horizontal path shown. determine the magnitude and direction of its total acceleration (a) just before point b, (b) just after point b, and (c) as it passes point c. state your directions relative to the x-axis shown (ccw positive) and choose the angle with the smallest magnitude.

What kind of waves require a medium to travel? question 6 options: light waves mechanical waves all waves need a medium to travel electromagnetic waves