A hobbyist launches a projectile from ground level on a horizontal plain. It reaches a maximum height of 72.3 m and lands 111 m from the launch point. Assume no air. What was the angle of launch if g = 9.80 m/s2?
A) 69.0°
B) 67.4°
C) 22.6°
D) 44.8°
A
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The number of official constellations (as defined by the International Astronomical Union) is
A) 56. B) 88. C) 123. D) 205.
Which two bodies have substantial atmospheres?
a. Mercury and Venus b. Mercury and Earth c. Mercury and Earth’s Moon d. Earth and Venus e. Earth and Mars
The fossil fuel deposits we use today are the remains of organisms from which period in Earth's history?
A) The Cretaceous Period B) The Carboniferous Period C) The Cambrian Period D) The Archaean Eon
Charge of uniform density 90 nC/m3 is distributed throughout the inside of a long nonconducting cylindrical rod (radius = 2.0 cm). Determine the magnitude of the potential difference of point A (2.0 cm from the axis of the rod) and point B (4.0 cm from the axis)
a. 1.9 V b. 1.4 V c. 2.2 V d. 2.8 V e. 4.0 V