A 3.0-kg mass sliding on a frictionless surface explodes into three 1.0-kg masses. After the explosion the velocities of the three masses are: (1) 9.0 m/s, north; (2) 4.0 m/s, 30° south of west; and (3) 4.0 m/s, 30° south of east. What was the magnitude of the original velocity of the 3.0-kg mass?
a. 1.7 m/s
b. 1.0 m/s
c. 1.3 m/s
d. 2.0 m/s
e. 2.8 m/s
A
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Angular Momentum: A puck moves on a horizontal air table. It is attached to a string that passes through a hole in the center of the table. As the puck rotates about the hole, the string is pulled downward very slowly and shortens the radius of rotation, so the puck gradually spirals in towards the center. By what factor will the puck's angular speed have changed when the string's length has decreased to one-half of its original length?
A. 2
B. 4
C. 
D. 1
E. 1/2
If a quantum of radiation has an energy of 2.10 keV, what is its wavelength? (h = 6.63 × 10^?34 J?s, 1 eV = 1.60 × 10^?19 J, c = 3.00 × 10^8 m/s, and 1 nm = 10?9 m)
a. 0.95 nm b. 197 nm c. 0.59 nm d. 1.24 nm e. 0.14 nm
An object is moving with constant non-zero velocity in the +x direction. The velocity versus time graph of this object is
A) a horizontal straight line. B) a vertical straight line. C) a straight line making an angle with the time axis. D) a parabolic curve.
Life forms became large and complex during the ______________ period
Fill in the blank(s) with correct word