You and Mae are in free-float frames. Mae has just passed you, traveling at a speed of 60 km/hr. You throw a ball toward her at a speed of 60 km/hr. What will Mae see the ball doing?
A) She'll see the ball coming toward her at 60 km/hr.
B) The ball will be stationary, floating freely in her own reference frame.
C) She'll see the ball moving away from her at 60 km/hr.
D) She'll see the ball coming toward her at 120 km/hr.
B
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Dimensional Analysis: In Einstein's famous equation E = mc2, describing the relationship between matter and energy, E stands for energy, m stands for mass, and c is the speed of light in vacuum. What are the SI units of E?
A. kg/s B. kg/s2 C. kg ? m/s2 D. s2 / (kg ? m) E. kg ? m2 / s2
0.0001895 can also be expressed as
A) 1.895 × 10-3. B) 1.895 × 10-4. C) 18.95 × 104. D) 1895 × 105. E) 189.5 × 107.
Batter up! Your bat hits the ball pitched to you with a 1500-N instantaneous force. The ball hits the bat with an instantaneous force, whose magnitude is
A) somewhat less than 1500 N. B) exactly equal to 1500 N. C) essentially zero. D) somewhat greater than 1500 N.
If the column of mercury in a barometer stands at 73.0 cm, what is the atmospheric pressure? (The density of mercury is 13.6 × 10^3 kg/m3 and g = 9.80 m/s2)
a. 9.73E+4 N/m2 b. 9.73E+6 N/m2 c. 1.17E+5 N/m2 d. 1.83E+3 N/m2 e. 1.01E+5 N/m2