Estimate the volume of a helium-filled balloon if it is to lift a payload of 1000 kg. The density of air is 1.29 kg/m3 and helium has a density of 0.178 kg/m3
a. 4410 m3
c. 450 m3
b. 900 m3
d. 225 m3
B
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Answer the following statement true (T) or false (F)
What is Sgr A??
A) a source of bright radio emission in the center of our galaxy B) a source of bright ultraviolet light near the center of our galaxy C) the brightest star in the constellation Sagittarius D) the bulge at the center of our galaxy E) a source of bright X-ray emission coming from the entire constellation of Sagittarius
The speed of a particle moving in a circle 2.0 m in radius increases at the constant rate of 4.4 m/s2 . At an instant when the magnitude of the total acceleration is 6.0 m/s2, what is the speed of the particle?
a. 3.9 m/s b. 2.9 m/s c. 3.5 m/s d. 3.0 m/s e. 1.4 m/s
A person weighing 0.70 kN rides in an elevator that has an upward acceleration of 1.5 m/s2 . What is the magnitude of the force of the elevator floor on the person?
a. 0.11 kN b. 0.81 kN c. 0.70 kN d. 0.59 kN e. 0.64 kN