A 0.20-km wide river has a uniform flow speed of 4.0 m/s toward the east. It takes 20 s for a boat to cross the river to a point directly north of its departure point on the south bank. In what direction must the boat be pointed in order to accomplish this?
a. 23° west of north
b. 20° west of north
c. 24° west of north
d. 22° west of north
e. 17° west of north
d
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A white dwarf has the mass of the Sun and the volume of
A) Jupiter. B) Earth. C) the Moon. D) Eros. E) Mars.
In reply to a student's question, a guard in a natural history museum says of the fossils near his station, "When I started work here twenty-four years ago, they were 80 million years old, so you can add it up." Which of the following is the best conclusion that the student can make regarding the age of the fossils?
1.The fossils are less than 80,000,000 years old. 2.The fossils are still about 80,000,000 years old. 3.The fossils are 80,000,024 years old. 4.The fossils are more than 80,000,000 years old.
The temperature on an Oswego, New York "warm" spring day has a maximum of 64°F and a minimum of 30°F. What is the number of heating degree days?
a. 18 b.30 c. 34 d. 47 e. 64
The capacitors are completely discharged in the circuit shown below
The two resistors have the same resistance R and the two capacitors have the same capacitance C. After the switch is closed, the current
a.
is greatest in C1.
b.
is greatest in C2.
c.
is greatest in R1.
d.
is greatest in R2.
e.
is the same in C1, C2, R1 and R2.