A child on a merry-go-round is moving with speed 4 m/s in a circle with radius 2 m. If the child's mass is 30 kg, what is the centripetal force?
240 N
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A brass rod is placed between two temperature sources so that heat can flow between them. One temperature is 80
and the other temperature is 20
The length of the rod is 50.0 cm and the cross sectional area is 15.0 cm2 . If the coefficient of thermal conduction for brass is 100 W/m 
then what is the heat flow between the hot temperature and the cold temperature?
A. 7.5 W B. 8.2 W C. 9.4 W D. 12 W E. 18 W
Protostars are difficult to observe because
a. the protostar stage is very short. b. they are surrounded by cocoons of gas and dust. c. they radiate mainly in the infrared. d. the protostar stage is very short, they are surrounded by cocoons of gas and dust, and they radiate mainly in the infrared. e. they are all so far away that the light hasn't reached us yet.
Charge of a uniform density (8.0 nC/m2) is distributed over the entire xy plane. A charge of uniform density (3.0 nC/m2) is distributed over the parallel plane defined by z = 2.0 m. Determine the magnitude of the electric field for any point with z = 3.0 m
a. 0.79 kN/C b. 0.17 kN/C c. 0.62 kN/C d. 0.34 kN/C e. 0.28 kN/C
Spicules can trigger communications blackouts and auroras on Earth
a. True b. False Indicate whether the statement is true or false