Dams at two different locations are needed to form a lake. When the lake is filled, the water level will be at the top of both dams. Dam #2 is twice as high and three as wide as Dam #1 . How much greater is the force of the water on Dam #2 than the force on Dam #1? (Ignore atmospheric pressure; it is pushing on both sides of the dams.)
a. 24
c. 6
b. 12
d. 3
B
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Power: If the voltage across a circuit of constant resistance is doubled, the power dissipated by that circuit will
A. be four times as large. B. be two times as large. C. decrease to one-half the original power. D. decrease to one-fourth the original power.
Answer the following statement(s) true (T) or false (F)
Einstein’s photon model is consistent with the results of two-slit interference experiments involving light.
A long straight wire is parallel to one edge and is in the plane of a single-turn rectangular loop as shown. If the loop is changing width so that the distance x changes at a constant rate of 4.0 cm/s, what is the magnitude of the emf induced in the loop at an instant when x = 6.0 cm? Let a = 2.0 cm, b = 1.2 m, and I = 30 A
a.
5.3 ?V
b.
2.4 ?V
c.
4.8 ?V
d.
2.6 ?V
e.
1.3 ?V
Astronomers have discovered two black holes in the process of merging
Indicate whether the statement is true or false