A flatbed truck is carrying a 20-kg crate up a sloping road. The coefficient of static friction between the crate and the bed is 0.40, and the coefficient of kinetic friction is 0.30
What is the maximum angle of slope that the truck can climb at constant speed if the crate is to stay in place?
A) 13° B) 0.38° C) 17° D) 68° E) 22°
E
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Electrons are collected by removing them from the atoms in a sample of water vapor (H2O, molecular mass 18u). If every hydrogen atom has lost an electron in the process, what is the mass of the sample if a charge of exactly 1.0C was collected?
A. 62 ?g B. 370 ?g C. 93 ?g D. 180 ?g
Most of the energy emitted by the Sun is generated in the
a. corona. b. photosphere. c. chromosphere. d. core.
Briefly explain the purpose of the equation
Number of Civilizations = NHP × flife × fcivilization × fnow. What will be an ideal response?
The astrometric technique looks for planets with careful measurements of a star's
A) brightness. B) velocity towards or away from us. C) position in the sky. D) all of the above