You and your surfing buddy are waiting to catch a wave a few hundred meters off the beach
The waves are conveniently sinusoidal, and you notice that when you're on the top of one wave and moving toward your friend, she is exactly halfway between you and the trough of the wave. 1.50 seconds later, your friend is at the top of the wave. You estimate the horizontal distance between you and your friend at 8.00 m.
(a) What is the frequency of the waves?
(b) Find the speed of the waves.
What will be an ideal response?
Answer: (a) 0.167 Hz (b) 5.33 m/s
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A circular window in the wall of a home has a diameter of 25 cm and is made of a single pane of glass 0.30 cm thick. Thermal conductivity for the glass is 0.63 W/mK. If 1.6 kJ is lost through the window in 12 s, and if inside the house the temperature is 
what is the outside temperature?
a. 
b. 
c. 
d. 
e. 
Gamma rays are photons with very high energy. How many visible-light photons with a wavelength of 500 nm would you need to equal the energy of a gamma-ray photon with energy
A) 1.0 × 106 B) 1.4 × 108 C) 6.2 × 109 D) 3.9 × 103
Which of the following is a type of fast mass
wasting? a) glacier flow b) creep c) meanders d) mudslides
A 6-? resistor, an 8-? resistor, and a 24-? resistor are connected together. What is the minimum resistance that can be produced using all three resistors?
A) 4 ? B) (1/24 ) ? C) 3 ? D) (1/6 ) ? E) 7 ?