A 10-kg object is dropped from rest. After falling a distance of 50 m, it has a speed of 26 m/s. What is the change in mechanical energy caused by the dissipative (air) resistive force on the object during this descent?
a. -1.3 kJ
b. -1.5 kJ
c. -1.8 kJ
d. -2.0 kJ
e. -2.3 kJ
Question 2
A 12-kg projectile is launched with an initial vertical speed of 20 m/s. It rises to a maximum height of 18 m above the launch point. What is the change in mechanical energy caused by the dissipative (air) resistive force on the projectile during this ascent?
a. -0.64 kJ
b. -0.40 kJ
c. -0.52 kJ
d. -0.28 kJ
e. -0.76 kJ
Local and long–distance cell communication in animals.
Part of the Hubble Ultra-Deep Field image showing a typical section of space containing galaxies int
Major moons of Uranus in order of increasing distance (left to right), at their proper relative size
Comet 67P/Churyumov-Gerasimenko from a distance of just 29 kilometres (ESA)
An IAC controls idle speed by controlling the amount of air that passes around the throttle plate. ...
A pool player is attempting a fancy shot. He hits the cue ball giving it a speed of 5.57 m/s ...