Answer: a. Frequency. 20, 4, 3, 1, 1, 0, 1
Explanation:
Interval(Height in feet) - - - - - - - - frequency
14000 - 14999 - - - - - - - - - - - - - - - 20
15000 - 15999 - - - - - - - - - - - - - - - 4
16000 - 16999 - - - - - - - - - - - - - - - 3
17000 - 17999 - - - - - - - - - - - - - - - 1
18000 - 18999 - - - - - - - - - - - - - - - 1
19000 - 19999 - - - - - - - - - - - - - - - 0
20000 - 20999 - - - - - - - - - - - - - - 1
Frequency : (20, 4, 3 1, 1, 0, 1)
The answer is "False". The force acting on the object is 27 N.
According to Newton's second law, when a force <em>F</em> acts on am object of mass <em>m</em>, it produces an acceleration <em>a</em>. The force is given by the expression,
Thus, if the body has a mass of 9.0 kg and if it has an acceleration of 3 m/s², then, on substituting the values in the equation for force,
Thus, it can be seen that the force acting on the body is 27 N and not 3 N as is mentioned in the statement. Hence the statement is false.
Answer:
208.33 W
141.26626 seconds
Explanation:
E = Energy =
t = Time taken = 8 h
m = Mass = 2000 kg
g = Acceleration due to gravity = 9.81 m/s²
h = Height of platform = 1.5 m
Power is obtained when we divide energy by time
The average useful power output of the person is 208.33 W
The energy in the next part would be the potential energy
The time taken would be
The time taken to lift the load is 141.26626 seconds