Which of the following machines most likely has the greatest efficiency?

a

A. Airplane

B. Automobile

C. Bicycle

D. Human body

1. Material thrown out from an impact crater settles to form which of the following structures? A) central peak B) wall C) ray D) rim 2. Moon rocks resemble rocks from which of Earth layers? A) crust B) mantle C) inner core D) outer core 3.

During the stage of internal combustion engine operation in which the piston rises and compresses the fuel in the combustion chamber, a. both the intake and exhaust valves are closed. b. both the intake and exhaust valves are open. c.

Malcolm wanted to measure the volume of an object. Which SI unit should he use?

In which phase change does a substance change from a liquid to a gas

Weddell seals make holes in sea ice so that they can swim down to forage on the ocean floor below. Measurements for one seal showed that it dived straight down from such an opening, reaching a depth of 0.30 km in a time of 5.0 min.

What is orbital radii?

Which statement about our solar system is false? a. The Kuniper Belt is between Uranus and Neptune. b. The Sun is the only star in our solar system. c. Our solar system is made up of the Sun and other objects that orbit the Sun. d.

We can model a small merry-go-round as a uniform circular disk with mass 88 kg and diameter 1.8 m. How many 22 kg children need to ride the merry-go-round, standing right at the outer edge, to double the moment of inertia of the system?

What are the different types of waves?

The force needed to move an object 14 meters with 83 joules of work is what?