A projectile is launched straight upward at 50 m/s. Neglecting air resistance its speed upon returning to its starting point is
A) less than 50 m/s.
B) 50 m/s.
C) more than 50 m/s.
Answer: B
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A planet with a higher reflectivity will do which of the following?
A) reflect more light and absorb less light B) reflect less light and absorb more light C) emit more light D) emit higher energy light E) transmit more light
Angular Quantities: At a certain instant, a compact disc is rotating at 210 rpm. What is its angular speed in rad/s?
A. 11 rad/s B. 22 rad/s C. 45 rad/s D. 69 rad/s E. 660 rad/s
Graphical Addition: Refer to the figure, which shows four vectors 
,
, 
, and 
.
(a) Vector 
as
expressed in terms of vectors 
and 
is given byA) 
+ 
.B) 
- 
.C) 
- 
.(b) Vector 
as expressed in terms of vectors 
and 
is given byA) 
+ 
.B) 
- 
.C) 
- 
.
Fill in the blank(s) with the appropriate word(s).
How does Kepler's First Law refine the Copernican model greatly?
What will be an ideal response?