If the momentum of an electron is 1.95 × 10-27 kg?m/s, what is its de Broglie wavelength?
A) 340 nm
B) 210 nm
C) 170 nm
D) 420 nm
E) 520 nm
A
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An artillery shell is fired with an initial velocity of 300 m/s at 55.0° above the horizontal. It explodes on a mountainside 42.0 s after firing. If x is horizontal and y vertical, find the (x, y) coordinates where the shell explodes.
What will be an ideal response?
In pre-Copernican astronomy, it was almost universally believed that
a. the planets traveled in elliptical orbits about Earth. b. the center of the universe was the Sun with the Milky Way representing other distant planets. c. the Sun was at the center of the universe. d. Earth was at the center of the universe. e. None of the above was believed.
Potential: As an electron moves in the direction the electric field lines
A. it is moving from low potential to high potential and gaining electric potential energy. B. it is moving from low potential to high potential and losing electric potential energy. C. it is moving from high potential to low potential and gaining electric potential energy. D. it is moving from high potential to low potential and losing electric potential energy. E. both its electric potential and electric potential energy remain constant.
Uniform Circular Motion: Shown below are the velocity and acceleration vectors for an object in several different types of motion. In which case is the object's velocity changing while its speed is not changing?
A. 
B. 
C. 
D. 