Supplemental Instruction
Iowa State University / Leader: / Song
Course: / PHYS 111
Instructor: / Furukawa
Date: / November 8, 2016
Important equations: ρ = mV；P = FA；Pgauge = P - Patm；Patm = 1.01´105 N/m2；P2 = P1 + ρhg；
FBuoyant = rfluidVg；Dm1Dt = r1A1v1 = r2A2v2 = Dm2Dt；P1 + 12rv12 + rgy1 = P2 + 12rv22 + rgy2.
1. (T/F) Temperature is the only factor that determines whether two objects in thermal contact are in thermal equilibrium or not.
2. (T/F) Zero Celsius is defined to be absolute zero.
3. (T/F) Most substances expand when heated and the change in length or volume is typically proportional to the change in temperature.
4. A grandfather clock uses a brass pendulum to keep perfect time at room temperature. If the air conditioning breaks down on a very hot summer day, how will the grandfather clock be affected?
A) it will run slower than usual
B) it will still keep perfect time
C) it will run faster than usual
D) it won’t be affected
5. If the Sun’s surface temperature falls to half the current surface temperature, by what factor will the radiant energy reaching the Earth change?
A) increase by factor of 16
B) increase by factor of 4
C) it will remain the same
D) decrease by factor of 4
E) decrease by factor of 16
6. To water the yard you use a hose with a diameter of 3.4 cm. Water flows from the hose with a speed of 1.1 m/s. If you partially block the end of the hose so that the effective diameter is now 0.57 cm, with what speed does the water spray from the hose?
7. Water flows through a pipe with a speed of 2.1 m/s. Find the mass flow rate (Δm/Δt) in kg/s if the diameter of the pipe is 3.8 cm and the density of water is 1000 kg/m3.
8. Water flows through a pipe with a speed of 1.6 m/s. When the pipe narrows to half of its original diameter, what is the speed of the water?