Estimate the volume of a helium-filled balloon at STP if it is to lift a payload of 450 kg. The density of air is 1.29 kg/m3 and helium has a density of 0.178 kg/m3
a. 2 500 m3
b. 310 m3
c. 410 m3
d. 350 m3
e. 500 m3
c
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A device that transforms mechanical energy into electrical energy is a
A) generator. B) motor. C) transformer. D) magnet. E) none of the above
The wheelbase on a truck is 2.4 m wide and the truck's center of mass is located along the vertical centerline of the truck and 2.0 m above the bottom of the tires. The truck is going around a banked turn, when it is forced to stop
What is the maximum slope that the bank can have such that the truck will not tip over? A) 26° B) 31° C) 34° D) 39° E) 21°
In order to overcome a surface tension of a fluid, a force of 1.35 × 10^?2 N is required to lift a wire ring of circumference 13.0 cm. What is the surface tension of the fluid?
a. 0.052 N/m b. 0.104 N/m c. 0.552 N/m d. 5.19 N/m e. 17.6 N/m
If you mix a typical aluminum ion (Al, atomic no. = 13) with a typical oxygen ion (O, atomic no. = 8), what compound is formed?
A) Al2O3 B) Al3O2 C) Al13O8 D) Al3O E) Al2O2