Saturday
May 25, 2013

# Posts by Charlie

Total # Posts: 339

Physics
A special pulley has two discs with radii R1 = .8 m and R2 = .35 m. A rope from the R2 disc connects the pulley to a wall and a rope from the R1 disc connects the pulley to a hanging mass. The axle is frictionless. The total mass of the pulley is 15 kg. a. If the hanging mass ...

Physics
A 3.0 m beam with mass 50.0 kg is attached to a wall with a hinge. A rope is connected to the middle of the beam and the wall forming a 60 degree angle with respect to the beam. A mass of 25.0 kg is set on the beam at an unknown distance. a. Draw a free body diagram of the bea...

Physics
A 10 kg monkey wishes to climb a 7.15-meter high vine. The vine will break if the tension exceeds 110 N. The monkey starts from rest and exerts a constant force on the rope as he pulls himself upward. What is the shortest amount of time in which the monkey can climb the vine?

Physics
An actor in an action movie is supposed to jump up and catch a ring moving overhead which will carry him to safety. The ring is 8 m above the actor and moving at 12 m/s to the right. The actor jumps straight up and catches the ring at the peak of his jump. How far to the left ...

Physics
A 50-kg person starts from rest at the top of a large frictionless spherical surface (radius 6 m) and slides into the water below. What is the magnitude of the normal force she experiences halfway along the spherical surface (at theta = 45 degrees as shown)? At this point, she...

Physics
An aquarium filled with water has flat glass sides whose index of refraction is 1.48. A beam of light from outside the aquarium strikes the glass at a 43.5º angle to the perpendicular . The angle this light ray enters the glass is 27.7º, what is the angle of this lig...

Pysics
An aquarium filled with water has flat glass sides whose index of refraction is 1.48. A beam of light from outside the aquarium strikes the glass at a 43.5º angle to the perpendicular . The angle this light ray enters the glass is 27.7º, what is the angle of this lig...

Physics
An EM wave has a wavelength of 620 nm. What is its frequency? How would we classify it?

Chemistry
Why B(CH3)3 cannot be Lewis Base??

science
Rank the species from strongest to weakest base: Cl-, OH-,NH2

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