Momentum: A 100-g ball falls from a window that is 12 m above ground level and experiences no significant air resistance as it falls. What is its momentum when it strikes the ground?
A. 3.3 kg ? m/s
B. 4.8 kg ? m/s
C. 1.8 kg ? m/s
D. 1.5 kg ? m/s
E. 2.4 kg ? m/s
Answer: D
You might also like to view...
The attractive force between protons and neutrons in the nucleus is brought about by the exchange of a virtual pi-meson (m? = 140 MeV/c2). Estimate the longest time a ? can exist in accordance with the uncertainty principle ?E??t = h/2?. (h/2? = 1.05 × 10^?34 J?s, 1 eV = 1.6 × 10^?19 C)
a. 3.3 × 10^?18 s b. 2.4 × 10^?21 s c. 4.7 × 10^?24 s d. 6.9 × 10^?27 s
Estimate the heat loss per meter of building height due to convection from the vertical walls of a square apartment building if air at -10ºC moves at 30 km/hr across the building. The surface temperature of the building is 10ºC.
If you swing a bucket of water fast enough in a vertical circle, at the highest point the water does not spill out because an outward force balances the pull of gravity on the water
A) True B) False
The ideal gas in a sealed container has its absolute temperature quadrupled. What happens to the average time between molecular collisions in the gas?
a. It stays the same. b. It decreases to half its original value. c. It decreases but not to half its original value. d. It increases.