The efficiency of an average gasoline-powered car is about 20%. This means A. the gas tank needs to be 20% filled with gasoline for motion.
B. the car uses 80% of the energy stored in the gasoline for motion.
C. the car uses 20% of the energy store in the gasoline for motion.
D. the car wastes 20% of the energy stores in the gasoline.

After the near spacecraft passed mathilde, on several occasions rocket propellant was expelled to adjust the spacecraft's momentum in order to follow a path that would approach the asteroid eros, the final destination for the mission. after getting close to eros, further small adjustments made the momentum just right to give a circular orbit of radius 45 km (45 × 10^3 m) around the asteroid. so much propellant had been used that the final mass of the spacecraft while in circular orbit around eros was only 545 kg. the spacecraft took 1.04 days to make one complete circular orbit around eros. calculate what the mass of eros must be.

The a992 steel rod bc has a diameter of 50 mm and is used as a strut to support the beam. determine the maximum intensity w of the uniform distributed load that can be applied to the beam without risk of causing the strut to buckle. take f.s. = 2 against bucklin

What is the major limitation to the light microscope?