Cesium 2013

Reminders for today:

CHEM:
- LT na bukas. About Colligative Properties.

FIL:
- Malayang Taludturan is due on Tuesday (November 29). No Min./Max.

ENG:
- LT bukas rin. About the Introduction, the Tao Te Ching, and the Analects.

PHY:
- LT on November 25 (Friday). About Work, Energy, and Power. (Self-Study on Power)
- Problem Set: (Due: December 1)

Taken from Giancolli, 3rd Ed.:

p. 145-146:

25) (II) In 1955, a paratrooper fell 370 m after jumping from an aircraft without his parachute opening. He landed in a snowbank, creating a crater 1.1 m deep, but survived with only minor injuries. Assuming the paratrooper's mass was 80 kg and his terminal velocity was 50 m/s, estimate: (a) the work done by the snow in bringing him to rest; (b) the average force exerted on him by the snow to stop him; and (c) the work done on him by sir resistance as he fell.

28) (I) A spring has a spring constant, k, of 380 N/m. How much must this spring be compressed to store 60 J?

39) (II) A 60-kg crate, starting from rest, is pulled across a floor with a constant horizontal force of 100 N. For the first 10 m the floor is frictionless, and for the next 10 m the coefficient of friction is 0.20. What is the final speed of the crate.

41) (II) The roller coaster in Fig. 6-19 passes point A with a speed of 1.20 m/s. If the average force of friction is equal to one-fifth of its weight, with what speed will it reach point B? The distance traveled is 67.0 m.



47) (I) How long will it take a 1500-W motor to lift a 400-kg piano to a sixth-story window 15.0 m above?

Prob. Set 1 and LT1 Solutions:






*Comment if I missed/wronged anything.