Answer:
3.7 km/h
Explanation:
Let's call v the proper speed of the boat and v' the speed of the water in the river.
When the boat travels in the direction of the current, the speed of the boat is:
v + v'
And it covers 50 km in 3 h, so we can write
(1)
When the boat travels in the opposite direction, the speed of the boat is
v - v'
And it covers 50 km in 5.4 h, so
(2)
So we have a system of two equations: by solving them simultaneously, we find the value of v and v':
Subtracting the second equation from the first one we get:
So, the speed of the water is 3.7 km/h.
Answer:
176.9N
Explanation:
The following data were given
wire length,L=37cm=0.37m
linear density=18g/m
tube length,=192cm=1.92m,
speed of sound,v=343m/s
Since it is an open-closed tube, the second harmonic frequency is expressed as
The relationship between the tension, linear density and second harmonic frequency is expressed as
Answer:
1.35 miles
Explanation:
Since the slope is 14% grade = -14/100. This is a negative slope.
The distance of 1000 ft descended is a vertical descent, so assuming our initial position is 0, and Δx is the change in horizontal distance.
tanθ = -14/100 = (0 - 1000)/Δx = - 1000)/Δx
-14/100 = - 1000)/Δx
Δx = -1000 × -100/14= 7142.86 ft
5280 ft = 1 mile
7142.86 ft = 7142.86/5280 miles = 1.353 miles ≅ 1.35 miles
Answer:
Law of Motion/ Law of Inertia
Explanation:
Objects at rest stay at rest unless you're the one to move it.
<span>Nitrogen forms : N ≡ N , Oxygen forms: O = O
N: 2s2 2p3 O: 2s2 2p4
Bond order for ¹⁴N - ¹⁶O bond:
= (number of bonding electrons - number of antibonding electrons)/2
= [ (2 from N +4 from O) - 1 from N ] / 2 = 2.5
m1 = 14u m2 = 16u
reduced mass = μ = m1 * m2 / (m1 + m2)
= 112/15 = 7.47 u
μ = 7.47 * 0.001 kg / 6.023 * 10²³ = 1.239 * 10⁻²⁶ kg
k = force constant = 1150 N/m
c = speed of light = 3 * 10¹⁰ cm/s</span>