A child uses a force of 45 N to pull a sled with a rope. The angle between the rope and the ground is 35 degrees. What is the horizontal component of the tension?
A. 25.8 N
B. 36.9 N
C. 54.9 N
D. 78.5 N

Assume that a person skiing high in the mountains at an altitude of h = 15100 ft takes in the same volume of air with each breath as she does while walking at sea level. determine the ratio of the mass of oxygen inhaled for each breath at this high altitude compared to that at sea level. assume that the air composition (i. e. % of air that is oxygen) is the same at sea level as it is at 15100 ft.

Which of the following are guidelines to follow for obtaining accurate observations

In which of the following would the particles move most rapidly? a. ice at -20 °c b. water at 20 °c c. steam at 110 °c d. boiling water e. ice at 0 °c