The wavelength of a 45-kg teenager moving at 5 m/s on a skateboard is about
a. 5 × 10^?37 m.
b. 3 × 10^?36 m.
c. 7 × 10^?34 m.
d. 0.1 m.
e. 5 m.
b
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An electron moves in a region where the magnetic field is uniform and has a magnitude of 80 ?T. The electron follows a helical path which has a pitch of 9.0 mm and a radius of 2.0 mm. What is the speed of this electron as it moves in this region?
a. 48 km/s b. 28 km/s c. 20 km/s d. 35 km/s e. 8.0 km/s
An energy band in a solid consists of
a. an infinite number of levels, with each level corresponding to a point in a box. b. a large number of energy levels so closely spaced that they may be regarded as a continuous band. c. an infinite number of wave functions, with each wave function corresponding to a point in a box. d. a large number of electrons so closely spaced that they may be regarded as a continuous band of electric charge. e. an infinite number of electrons, with each electron corresponding to a point in a box.
The ____________________ contains a large amount of gas and dust and a great number of stars, and our Sun is one of those stars
Fill in the blank(s) with correct word
A rocket is launched from the origin with an acceleration of 20.0 
at an angle of 30.0 degrees above the horizontal. The launch acceleration lasts for 2.00 seconds at which time the fuel is exhausted. The rocket then falls with an acceleration of 9.80 
downward. What is the X distance (range) when the rocket hits the ground?
A. 153 m B. 166 m C. 187 m D. 205 m E. 230 m