<span>NO.
Air resistance does not affect the motion of a falling object differently when the mass is greater because the mass of an object does not in any way affect the speed of falling due to gravity, and air resistance depends only on the speed of the object and its surface area.</span>
Missing question: "<span>At what time is the velocity again zero?"
Solution:
the acceleration of the particle is
</span>
<span>the velocity of the particle is the derivative of the acceleration:
</span>
<span>where </span>
is the initial velocity, given by the problem.
So, to find when the particle's velocity is again zero, we should just put vx=0 and find t:
which has two solutions:
t=0 (beginning of motion)
and so, the particle velocity returns to zero after 20 seconds.
Answer: 1224 joules
Explanation:
Given variables are:
Power (p) = 68 W
Time taken (t) = 18 seconds
work done (w) = ?
Recall that power is the rate of work done per unit time i.e Power is obtained by dividing the work done by the time taken.
Hence, Power = work / time
Make work the subject formula
work = power x time
work = 68 watts x 18 seconds
work = 1224 joules
Thus, 1224 joules of work is done.
Answer:D
Explanation: temperature is the measure of hotness and coldness of a body.
(1,500 meters) x (1 sec / 330 meters) = (4 and 18/33) seconds
(4.55 sec, rounded)