Answer:
a. 2.0secs
b. 20.4m
c. 4.0secs
d. 141.2m
e. 40m/s, ∅= -30°
Explanation:
The following Data are giving
Initial speed U=40m/s
angle of elevation,∅=30°
a. the expression for the time to attain the maximum height is expressed as
where g is the acceleration due to gravity, and the value is 9.81m/s if we substitute values we arrive at
b. the expression for the maximum height is expressed as
c. The time to hit the ground is the total time of flight which is twice the time to reach the maximum height ,
Hence T=2t
T=2*2.0
T=4.0secs
d. The range of the projectile is expressed as
e. The landing speed is the same as the initial projected speed but in opposite direction
Hence the landing speed is 40m/s at angle of -30°
A radiosonde is a lightweight package of measurements instruments
carried aloft by a helium balloon.
The radiosonde can be used to measure upper air temperature.
This is a true statement. Consequently, the better answer to choose
from among the choices provided is the ' T ' , apparently presented
here to suggest the word ' True ' .
Answer:
875
Explanation:
The digits more significant than the last two integer digits are dropped from the pressure reading placed on the upper right of the station model. Generally, the dropped digits will be 9 or 10.
987.5 mb would be recorded as 875 on the model.
Answer:
The work done on the jet is 
Given:
Force, F = 
Distance moved by the jet, x = 87 m
Kinetic Energy, KE = 
Solution:
Now, to calculate the work done on the fire fighter jet by the catapult, we find the difference between the KE of the jet at lift off and the work done by the engines.
This difference provides the amount of work done on the jet and is given by:
(1)
Now, the work done by the engines is given by:
Now, using eqn (1):
