While a rock is falling straight down it has
A) an increasing velocity.
B) zero velocity.
C) an unchanging velocity.
D) a decreasing velocity.
E) None of the above.
A
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Answer the following statement true (T) or false (F)
A 5.00-g lead BB moving at 44.0 m/s penetrates a wood block and comes to rest inside the block. If half of its kinetic energy is absorbed by the BB, what is the change in the temperature of the BB? The specific heat of lead is 128 J/kg ? K
A) 0.940 K B) 1.10 K C) 1.26 K D) 2.78 K E) 3.78 K
Two point charges of magnitude 4.0 ?C and -4.0 ?C are situated along the x-axis at x1 = 2.0 m and x2 = -2.0 m, respectively. What is the electric potential at the origin of the xy-coordinate system?
A) -36 × 103 V B) 0 V C) 36 × 103 V D) -48 × 103 V E) 48 × 103 V
A concave mirror always produces a real image of an object placed in front of it
Indicate whether the statement is true or false