What is the crust of the earth made of

Which scientist developed the quantum mechanical model of the atom?

The number three ball moves off with a velocity of 5 m/s. What is the final velocity and direction of the eight ball?

Quantum theory, where may the electrons of an atom be found

Shawn wants to perform an experiment. However, he needs to determine a question to answer with his experiment. Which of the following is a scientific question that could be used to form a good hypothesis? A.

Which statements below are true

Find the current Voltage VD and current ID in the following circuit assuming (a) ideal diode. (b) Constant voltage drop model with Von = 0.75V (c) using the exponential model (I_0=1*10^ (-14)). Verify your results through Multisim simulation

Suppose two stars are located in region a of the h-r diagram shown in the figure below. Star X appears much dimmer that Star Y as seen from Earth. Which Star can be inferred to be nearer to Earth, and how do you know?

A student examining a joint observes collagen-rich connective tissue fibers linking the bones, but finds no synovial cavity. Which structural classification fits the observed joint?

How to identify additional materials

Tarzan runs at 6 m/s and grabs a vertical vine (negligible mass) 4.1 m long which is tied to a tree at the top. Tarzan swings up. Determine the maximum height Tarzan will swing up and the angle the vine makes respect to vertical.