Of the quarks u, d, c, s, t, and b, which have positive fractional electronic charge?
a. u, d, c
c. s, t, b
b. d, s, b
d. u, c, t
D
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A 2 kg car moving towards the right at 4 m/s collides head on with an 8 kg car moving towards the left at 2 m/s, and they stick together. After the collision, the velocity of the combined bodies is 0.8 m/s pointing towards the left
Indicate whether the statement is true or false
Which of the following reactions is the second reaction in the proton-proton chain?
A) 1H + 1H ? 2H + e+ + ? B) 2H + 2H ? 4He + e+ + ? C) 2H + 1H ? 3He + ? D) 3He + 3He ? 4He + 1H + 1H
Cart A, of mass m, starts from rest and travels in a straight line with acceleration a. It reaches velocity v in time t. Cart B, of mass 4m, starts from rest and travels in a straight line with acceleration 
. At time t it has reached velocity
A.
.B.
.C.
D.
E.
A man lifts a 20.0-kg bucket of concrete from the ground up to the top of a 20.0-m tall building. The bucket is initially at rest, but is traveling at 4.0 m/s when it reaches the top of the building
How much work was done by the man in lifting the bucket? A) 3.92 kJ B) 400 J C) 560 J D) 4.08 kJ E) 160 J