DX 17. The hourly temperature at Portland, Oregon, on a particular day is recorded below. 1 AM
46°
1 P. M.
720
2
449
2
749
3
43°
3
750
4
41°
4
5
40°
5
77°
6
40°
6
75°
7
41°
7
749
8 9
43° 46°
8 9
70° 62°
10
52°
10
55°
11
65°
11
51°
12 Noon
699
12 Midnight
48°
75°
a. Find the amplitude of a sinusoidal function that models this temperature variation.
b. Find the vertical shift of a sinusoidal function that models this temperature variation.
c. What is the period of a sinusoidal function that models this temperature variation?
d. Use t=0 at 5 P. M. to write a sinusoidal function that models this temp. variation.
e. What is the model's temperature at 10 A. M? Compare this to the actual value?

Scientists use laser range-finding to measure the distance to the moon with great accuracy. a brief laser pulse is fired at the moon, then the time interval is measured until the "echo" is seen by a telescope. a laser beam spreads out as it travels because it diffracts through a circular exit as it leaves the laser. in order for the reflected light to be bright enough to detect, the laser spot on the moon must be no more than 1.0 km in diameter. staying within this diameter is accomplished by using a special large-diameter laser. part a if λ = 540nm , what is the minimum diameter of the circular opening from which the laser beam emerges? the earth-moon distance is 384,000 km. express your answer to two significant figures and include the appropriate units.

Which process is represented by the pv diagram? a. the isobaric process b. the isovolumetric process c. the isothermal process d. the adiabatic process

You are traveling in a car going at a constant speed of 100km/h down a long, straight highway. you pass another car going in the same direction which is traveling at a constant speed of 80km/h. as measured from your car's reference frame this other car is traveling at −20km/h. what is the acceleration of your car as measured from the other car's reference frame? what is the acceleration of the other car as measured from your car's reference frame?