A diver on a parachute jump has a combined mass of 180Kg, and air resistance of 1,800N. Calculate the net force on the diver
Answers
NOTE: The next 15 questions presume that the value of g is 10 m/s/s.
11. A 1200 kg car and a 2400 kg car are lifted to the same height at a constant speed in a auto service station. Lifting the more massive car requires ____ work.
a. less
b. the same
c. twice as much
d. four times as much
e. more than 4 times as much
Answer: C
The amount of work done by a force to displace an object is found from the equation
W = F*d*cos(Theta)
The force required to raise the car at constant speed is equivalent to the weight (m*g) of the car. Since the 2400-kg car weighs 2X as much as the 1200-kg car, it would require twice as much work to lift it the same distance.
Answer:
There are over 30 phyla dedicated to invertebrates. Major invertebrate phyla that you should know include porifera, cnidaria, platyhelminthes, nematoda, mollusca, annelida, arthropoda, and echinodermata