A wheel rotates about a fixed axis with a constant angular acceleration of 4.0 rad/s2 . The diameter of the wheel is 40 cm. What is the linear speed of a point on the rim of this wheel at an instant when that point has a total linear acceleration with a magnitude of 1.2 m/s2?

a. 39 cm/s
b. 42 cm/s
c. 45 cm/s
d. 35 cm/s
e. 53 cm/s


b

Physics & Space Science

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A single-crystal wafer of silicon is to be used as a substrate for the deposition of thin-metal films that could be affected by the substrate’s crystallographic orientation. However, the crystallographic orientation of this particular wafer is not known. The wafer is placed in an x-ray diffractometer with a copper x-ray tube with a K? x-ray line at 0.1542 nm, and an intense peak is measured at an angle of 29.46°. Silicon is FCC with a lattice parameter of 0.543 nm. What planes are parallel to the surface of this silicon crystal?

What will be an ideal response?

Physics & Space Science

Briefly summarize current knowledge about the term flife in the equation Number of Civilizations = Np × flife × fcivilization × fnow

What will be an ideal response?

Physics & Space Science

Rotational Kinetic Energy: A futuristic design for a car is to have a large flywheel within the car to store kinetic energy. The flywheel is a solid uniform disk of mass 370 kg with a radius of 0.50 m, and it can rotate up to 200 rev/s. Assuming all of this stored kinetic energy could be transferred to the linear speed of the 1500-kg car, find the maximum attainable speed of the car.

Fill in the blank(s) with the appropriate word(s).

Physics & Space Science

What important change in the Sun over the past four billion years is thought to be very important to understanding the climates of Venus, Earth, and Mars?

A) a gradual weakening of the solar wind with time B) a gradual dimming with time C) a gradual brightening with time D) a gradual reduction in the amount of ultraviolet and X-ray radiation coming from the Sun

Physics & Space Science