A ladder 9 m long rest at an angle of 60" to the horizontal against a smooth vertical
wall. Calculate the frictional force and the
normal force of the ground if the ladder
has a mass of 25 kg and its center of
gravity is one-third way up from the
bottom of the ladder. Use g = 9.8ms-2

Imagine you are standing in the antarctic during the southern hemisphere summer. the sky is clear and blue. there are no clouds in the sky. your shadow is cast on the icy ground. what is the color of the shadow?

**urgent** roberto plans to use two transformers to reduce a voltage of 120 v to 4 v. he uses a transformer that has 300 coils in the primary winding and 50 coils in the secondary winding. he has four other transformers, as listed in the table. which transformer should roberto use to have an ending voltage of 4 v? a- w b-xc- yd- z

Apulley with mass mp and a radius rp is attached to the ceiling, in a gravity field of 9.81 m/s2 and rotates with no friction about its pivot.