A uniform meterstick balances on a fulcrum placed at the 40-cm mark when a weight W is placed at the 20-cm mark. What is the weight of the meterstick?
a. W
c. W/2
b. 2W
d. 0.4W
B
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Calculate the ground state energy (in eV) for an electron in a box (an infinite well) having a width of 0.050 nm
a. 10 b. 75 c. 24 d. 150 e. 54
A 5.0-m long, 12-kg uniform ladder rests against a smooth vertical wall with the bottom of the ladder 3.0 m from the wall
The coefficient of static friction between the floor and the ladder is 0.28. What distance, measured along the ladder from the bottom, can a 60-kg person climb before the ladder starts to slip? A) 4.0 m B) 3.7 m C) 1.7 m D) 1.3 m E) 3.3 m
LR Circuits: In a series circuit containing a resistor and an inductor connected to an ideal dc source and a switch, the inductor gets 40% of its maximum current 1.8 s after the switch is closed. What is the time constant of this circuit?
A. 0.80 s B. 1.5 s C. 2.5 s D. 3.5 s E. 5.5 s
A submarine must travel how fast (with respect to the water) and be pointed in what direction such that it moves 10. m/s directly Northward (relative to the Earth) if the water moves westward at 5.0 m/s?
What will be an ideal response?