What is a flat plate solar collector?
What will be an ideal response?
A flat plate solar collector is a device that collects solar energy, thermal energy
from the sun, to heat a fluid, gas, or solid surface. Typically, the arrangement of
a flat plate collector involves a container or box having a flat transparent surface
or cover which allows sun light to pass through and heat a fluid or gas in the
container and which usually passes through or flows through the container.
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A spring (k = 600 N/m) is placed in a vertical position with its lower end supported by a horizontal surface. A 2.0-kg block that is initially 0.40 m above the upper end of the spring is dropped from rest onto the spring. What is the kinetic energy of the block at the instant it has fallen 0.50 m (compressing the spring 0.10 m)?
a. 5.3 J b. 6.8 J c. 6.3 J d. 5.8 J e. 6.5 J
Modern electroplaters can cover a surface area of 55.0 m2 with one troy ounce of gold (volume = 1.611 cm3). What is the thickness of the electroplated gold?
a. 3.64 × 10^-7 m c. 1.83 × 10^-6 m b. 1.46 × 10^-9 m d. 2.93 × 10^-8 m
Relative Velocity: A 960-m wide river flows at 16 m/s as shown in the figure. Alice and John have a race in identical boats which each travel 20 m/s in still water. Alice leaves point A and steers so that she goes straight to point B directly across and then back to A. John leaves point A and steers up to point C (960 m upstream) and then returns to A.(a) Which person arrives back at point A first?(b) How much sooner than the loser does the winner arrive back at point A?
What will be an ideal response?