For general projectile motion if we neglect air, the vertical component of a projectile's acceleration
A) is always zero.
B) remains a non-zero constant.
C) continuously increases.
D) continuously decreases.
E) first decreases and then increases.
B
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Indicate whether the statement is true or false
Earth has a radius of about 6400 km, the Sun has a radius of about 7.0×10^5 km, and a rubber ball has a radius of 6.4 cm. If you were to construct a scale model of the solar system using the rubber ball to represent Earth, what is the radius of a ball needed to represent the Sun in your model?
a. 7.0 × 10^5 cm b. 7.0 cm c. 700 cm d. 70 cm e. 7000 cm
Energy and Momentum: If you want to double the kinetic energy of a gas molecule, by what factor must you increase its momentum?
A. 
B. 2
C. 2
D. 4
E. 16
A transverse periodic wave is represented by the equation y(x, t) = 2.50 cm cos(2,500 rad/s t - 15.0
x). What is the velocity of the wave?
A. 450 m/s in the - y direction B. 333 m/s in the + y direction C. 333 m/s in the + x direction D. 167 m/s in the - x direction E. 167 m/s in the + x direction