A billiard ball collides in an elastic head-on collision with a second identical ball. What is the kinetic energy of the system after the collision compared to that before collision?
a. the same as
b. one fourth
c. twice
d. four times
a
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Which is least expensive-for the same energy delivered?
A. coal B. gasoline C. natural gas D. AAA batteries
Energy and Momentum: A baseball pitcher is employing a ballistic pendulum to determine the speed of his fastball. A 3.3-kg lump of clay is suspended from a cord 2.0 m long. When the pitcher throws his fastball aimed directly at the clay, the ball suddenly becomes embedded in the clay and the two swing up to a maximum height of 0.080 m. If the mass of the baseball is 0.21 kg, find the speed of the pitched ball.
Fill in the blank(s) with the appropriate word(s).
A uniform linear charge density of 4.0 nC/m is distributed along the entire x axis. Consider a spherical (radius = 5.0 cm) surface centered on the origin. Determine the electric flux through this surface.
A. 68 N ? m2/C B. 62 N ? m2/C C. 45 N ? m2/C D. 79 N ? m2/C E. 23 N ? m2/C
Photovoltaic cells will never be much cheaper than now
What will be an ideal response?