Equilibrium: A light board that is 10 m long is supported by two sawhorses, one at one end of the board and a second at the midpoint. A 40-N weight is placed between the two sawhorses, 3.0 m from the end and 2.0 m from the center. What magnitude forces do the sawhorses exert on the board?
What will be an ideal response?
16 N at the end, 24 N at the midpoint
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A 2.0-kg projectile moves from its initial position to a point that is displaced 20 m horizontally and 15 m above its initial position. How much work is done by the gravitational force on the projectile?
a. +0.29 kJ b. ?0.29 kJ c. +30 J d. ?30 J e. ?50 J
Mn is a transition element and can form several ions. Its ionic charge in MnF3 must be ______________
Fill in the blank(s) with correct word
A binary star system is one with two stars orbiting each other. How can the Doppler effect be used to find binary stars whose orbital plane is along our line of sight? Their periods?
What will be an ideal response?
The cabin pressure of a passenger jet cruising at high altitude (30,000 ft) is about 1 atm. and the pressure outside is about 0.3 atm. What is the outward force on a window measuring 1 foot by 1 foot
a. 10.3 lb b. 100.3 lb c. 1,000.3 lb d. 1,481.8 lb e. 2,116.8 lb