A spherical hot air balloon of diameter 20. meters just floats (hovers) when the hot air inside has been heated to a density of 1.00 kg/m3
What is the weight of the balloon and cargo (not including the air inside) if the surrounding air has a density of 1.30 kg/m3?
1.2 × 104 Newtons (weight of 1.3 × 103 kg)
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A Styrofoam ice chest is 2 cm thick. If the inside of the chest is at 0ºC and outside the chest it is 25ºC, estimate the heat transfer by conduction through the Styrofoam per unit area.
What will be an ideal response?
Planetary scientists believe that the Moon was most likely a nearby small planet gravitationally captured by Earth.
Answer the following statement true (T) or false (F)
A 50-W light bulb is in a socket supplied with 140 V. What is the current in the bulb?
a. 0.36 A b. 2.8 A c. 90 A d. 7 000 A e. 3.8 A
Magma is generated at all of these plate boundaries except
A) divergent boundaries. B) oceanic-oceanic convergent boundaries. C) oceanic-continental convergent boundaries. D) continental-continental convergent boundaries.