The diameter and luminosity of a galaxy do not determine its type
a. True
b. False
Indicate whether the statement is true or false
True
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A hot air balloon along with its cargo has a mass of 4.0 × 105 kg, and it holds 7.0 × 105 m3 of hot air. It is floating at a constant height in air with a density of 1.29 kg/m3. What is the density of the hot air in the balloon?
A) 1.4 kg/m3 B) 0.72 kg/m3 C) 0.57 kg/m3 D) 0.86 kg/m3 E) 0.43 kg/m3
An (blank) is an engineered structure along a river that effectively raises the heihgt of the river bank and thus confines flood discharge
What will be an ideal response?
A beam of light in water (of refractive index of 1.33 ) enters a glass slab (of refractive index 1.50 ) at an angle of incidence of 60.0°. What is the angle of refraction in the glass?
A) 27.5° B) 39.8° C) 60.0° D) 90.0° E) 50.2°
The percentage by mass of hydrogen in methane, CH4, is about
a. 25%. b. 75%. c. 80%. d. 20%.