A river flows toward the East at 1.7 m/s. Steve can swim 2.0 m/s in still water. If he swims, relative to the water at a direction of 33 degrees west of north, how long will it take him to cross the 75 m wide river?
A. 45 s
B. 39 s
C. 123 s
D. 27 s
A. 45 s
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From full moon to third quarter moon takes about a week
Indicate whether the statement is true or false
Specific Heat: A 5.00-g lead BB moving at 44.0 m/s penetrates a wood block and comes to rest inside the block. If half of its kinetic energy is absorbed by the BB, what is the change in the temperature of the BB? The specific heat of lead is 128 J/kg ? K.
A. 0.940 K B. 1.10 K C. 1.26 K D. 2.78 K E. 3.78 K
A 2.0-mol ideal gas system is maintained at a constant volume of 4.0 L. If 100 J of heat is added, what is the work done on the system?
a. zero b. 5 J c. ?3.3 J d. 20 J e. 3.3 J
As a spaceship's velocity gets closer to the speed of light with respect to an external observer, that observer will report that
A) its length will increase and its clock will run more slowly. B) its length will decrease and its clock will run faster. C) its length will decrease and its clock will run more slowly. D) its length will increase and its clock will run faster. E) None of these will happen.