Answer:
Max height= 36000 meters
Total Time = 120 seconds
Explanation:
0 = U - at
U = at
U= 20*60
U= 1200 m/s
MAX altitude would be
(U²Sin²tita)/2g
Max height= 1200² *( SIN90)²/(2*20)
Time of FLIGHT
2 * 1200/20
2400/20
120 sec
onds
Answer:
Thus, the time for the remaining 120 miles: 8.5 - 6 = 2.5 h
Explanation:
The remaining 120 miles was (1 - 5/9 = 4/9) of the total journey.
Then, total distance: 120 ÷ 4/9 = 120 × 9/4 = 270 miles
The distance for 25 mph: 270 × 5/9 = 150 miles
The time for 25 mph: 150 ÷ 25 = 6 h
By Newton's second law,
<em>n</em> + (-<em>w</em>) = 0
<em>p</em> + (-<em>f</em> ) = (20 kg) (2 m/s²)
where <em>n</em> is the magnitude of the normal force, <em>w</em> is the weight of the box, <em>p</em> is the magnitude of the applied force (<em>p</em> for <u>p</u>ush or <u>p</u>ull), and <em>f</em> is the magnitude of the friction force.
Calculate the weight of the box:
<em>w</em> = (20 kg) (9.80 m/s²) = 196 N
Then
<em>n</em> = <em>w</em> = 196 N
and
<em>f</em> = <em>µ</em> <em>n</em> = 0.5 (196 N) = 98 N
Now solve for <em>p</em> :
<em>p</em> - 98 N = 40 N
<em>p</em> = 138 N
Well , its a easy problem
By ohms law,
we have V= IR
Where V is the voltage applied across the wire and R is the resistance and I is the current
=> R = V/I
=> R = 12/0.3 = 40 ohm