A wooden ball is tied to the bottom of a swimming pool by a string. What is the tension in the string if the ball’s diameter is 0.15 m and its mass is 144 g? The water in the pool is fresh water, 1000
density.
A. 0.35 N
B. 12.7 N
C. 14.1 N
D. 1.78 N
A. 0.35 N
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When a dielectric material is introduced between the plates of a parallel plate capacitor the capacitance increases by a factor of 4. What is the dielectric constant of the material introduced between the plates?
A) 0.4 B) 1/4 C) 2 D) 4 E) None of the other choices is correct.
In which eon of Earth's history did dinosaurs and mammals first appear?
A) Hadean B) Archean C) Phanerozoic D) Proterozoic
An elevator weighing 20 000 N is supported by a steel cable. What is the tension in the cable when the elevator is being accelerated upward at a rate of 3.00 m/s2? (g = 9.80 m/s2)
a. 6.1E+3 N b. 2.0E+4 N c. 6.0E+4 N d. 2.6E+4 N e. 6.7E+3 N
Determine the potential difference Va ? Vb shown in the circuit below
a.
?5.0 V
b.
+5.0 V
c.
?10 V
d.
+10 V
e.
0 V