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)
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
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