An object of mass 4.0 kg is thrown vertically upwards from ground level with an initial speed of 20 m/s. Ignore friction and use g = 10 m/s2. How high did the object go?
A) 20 m
B) 4.5 m
C) 15 m
D) 80 m
E) None of the other choices is correct.
A
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To be dimensionally consistent, pressure 
density 
and velocity [L/T] must be related as follows.
A. 
B. 
C. 
D. 
100 grams of molten lead (600°C) is used to make musket balls. If the lead shot is allowed to cool to room temperature (21°C), what is the change in entropy (in J/K) of the lead? (For the specific heat of molten and solid lead use 1.29 J/g×°C; the latent heat of fusion and the melting point of lead are 2.45 × 10^4 J/kg and 327°C.)
a. -145 b. -252 c. -302 d. -429 e. -100
A gasoline engine absorbs 2 500 J of heat and performs 1 000 J of mechanical work in each cycle. The amount of heat expelled in each cycle is
a. 1 000 J b. 1 500 J c. 2 000 J d. 500 J e. 3 000 J
The quark and antiquark in a meson are always of the same flavor
Indicate whether the statement is true or false