A projectile is launched at an angle less than 30° and at speed v. Which will increase the projectile's range more, ignoring atmospheric drag?
a. doubling the launch angle b. increasing the speed of launch by 50%
c. reducing the mass of the projectile d. launching on February 29th
b
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Identical particles are placed at the 50-cm and 80-cm marks on a meter stick of negligible mass. This rigid body is then mounted so as to rotate freely about a pivot at the 0-cm mark on the meter stick. If this body is released from rest in a horizontal position, what is the angular speed of the meter stick as it swings through its lowest position?
a. 4.2 rad/s b. 5.4 rad/s c. 4.6 rad/s d. 5.0 rad/s e. 1.7 rad/s
LC Circuits: A series circuit contains an 80-?F capacitor, a 0.020-H inductor, and a switch. The resistance of the circuit is negligible. Initially, the switch is open, the capacitor voltage is 50 V, and the current in the inductor is zero. At time t = 0 s, the switch is closed. When the current in the circuit is 1.5 A, what is the charge on the capacitor?
A. 2000 µC B. 2500 µC C. 3000 µC D. 3500 µC E. 4000 µC
Frost wedging is a form of
a) terminal erosion. b) physical weathering. c) chemical weathering. d) slow mass wasting.
Stars with masses between 0.4 and 4
a. undergo thermonuclear fusion of hydrogen and helium, but never get hot enough to ignite carbon. b. undergo thermonuclear fusion of hydrogen, but never get hot enough to ignite helium. c. produce type-I supernovae after they exhaust their nuclear fuels. d. produce type-II supernovae after they exhaust their nuclear fuels. e. undergo carbon detonation.