In what phase of matter are the particles no longer moving?
A) solid
B) liquid
C) gas
D) none of the above
Answer: D
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A sphere of radius 25 cm is at the bottom of a pool containing fresh water. If the total force on the sphere due to the water is 1025 N, what is the depth of the sphere below the surface? The air pressure outside is 101.5 kPa.
A. 7.6 m B. 5.7 m C. 52.8 m D. 13.2 m E. 2.9 m F. 39.6 m
A driver in a car traveling at slams on the brakes and skids to a stop. If the coefficient of friction between the tires and the horizontal road is 0.80, how long will the skid marks be?
A) 26 m B) 21 m C) 33 m D) 24 m
The turntable of a record player has an angular velocity of 8.0 rad/s when it is turned off. The turntable comes to rest 2.5 s after being turned off. Through how many radians does the turntable rotate after being turned off? Assume constant angular acceleration.
A. 12 rad B. 8.0 rad C. 10 rad D. 16 rad E. 6.8 rad
Very large capacitors have been considered as a means for storing electrical energy. If we constructed a very large parallel-plate capacitor of plate area 1.85 m2 using paper (? = 3.7) of thickness 1.5 mm as a dielectric, how much electrical energy would it store at a plate voltage of 1 500 V? (?0 = 8.85 × 10^?12 C2/N?m2)
a. 0.045 J b. 9.1 J c. 910 J d. 1 800 J e. 3 600 J