Two blocks are connected by a string that goes over an ideal pulley as shown in the figure and pulls on block A parallel to the surface of the plane
Block A has a mass of 3.00 kg and can slide along a rough plane inclined 30.0° to the horizontal. The coefficient of static friction between block A and the plane is 0.400. What mass should block B have in order to start block A sliding up the plane?
What will be an ideal response?
Answer: 2.54 kg
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From the edge of a roof top you toss a green ball upwards with initial velocity v0 and a blue ball downwards with the same initial velocity. When they reach the ground below,
A) the green ball will be moving faster than the blue ball. B) the blue ball will be moving faster than the green ball. C) the two balls will have the same speed.
Determine the potential difference Va ? Vb shown in the circuit below
a.
?5.0 V
b.
+5.0 V
c.
?10 V
d.
+10 V
e.
0 V
What is the unusual result of mass transfer in the Algol binary system?
A) a helium white dwarf B) a carbon white dwarf C) a black dwarf D) a red dwarf E) a brown dwarf
The constellation shaped like a big square (the "great square of . . . ") is
A) Cassiopeia. B) Pegasus. C) Canis Major. D) Taurus. E) Andromeda.