A train travels 55 km south along a straight track in 34 minutes. What is the train's average velocity in kilometers per hour?
2 answers:
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Answer:
Explanation:
given,
mass of the car,m = 0.2 Kg
height to width of ramp, y/x = 12/75
initial displacement, L_i = 2.25 m
change in momentum, Δp = 0.58 kg.m/s
distance of change in direction of the ramp, L_f = ?
Using equation
inserting all the values
The car will cost back up to the distance of 0.0196 m
Answer:
The radius of the cable is 0.0083 m or 8.3 mm.
Explanation:
The resistance of copper cable of 1 meter length will be given by
.... (i)
where the resistivity of copper is , and l is the length of the wire which is considered to be 1m, and a is the cross sectional area of the wire in
.
From the formula of power we know that, .... (ii)
Therefore 2 W/m = .... (iii)
where the resistance,R, actually means the resistance of the cable per meter.
Therefore R ( resistance of cable per meter)
= ohms / meter. .... (iv)
Therefore from (i)
=
..... (v)
where cross sectional area of the cable, a = ,
where r is the radius of the cable, and length of cable,l = 1m.
Therefore r =
Answer:
a)
b)
c)
Explanation:
We have:
m: is the ball's mass = 1.5 kg
v₀: is the initial speed = 15 m/s
g: is the gravity acceleration = 9.81 m/s²
a) In the initial position we have:
h: is the height = 0
The potential energy is given by:
The kinetic energy is:
And the mechanical energies:
b) At 5 m above the initial position we have:
h = 5 m
The potential energy is:
Now, to find the kinetic energy we need to calculate the speed at 5 m:
And the mechanical energies:
c) At its maximum height:
: is the final speed = 0
Now, the potential, kinetic and mechanical energies are:
I hope it helps you!