D. Mercury
Its year only takes 88 Earth days.
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Answer:
Acceleration = Final velocity-initial velocity/time
In m/s^2
a = 40000-0 /10
= 4000m/s
in km/h
a = 40/10÷360
= 1440km/h
Answer:
4.808m
Explanation:
Force is given as:
F = ma
Since the force is a frictional force,
Fr = F
Fr = ma
Frictional force, Fr, is given as:
-umg = ma
a = -ug = -0.13 * 9.8 = -1.274 m/s²
Using one of the equations of motion, we can find the distance:
v² = u² + 2as
Since the box comes to a halt, v = 0m/s:
0 = u² + 2as
s = -u²/2a
s = -(-3.5²)/(2 * 1.274) = 4.808m
Explanation:
we use the formula, Vf=Vi+at
since the cheetah accelerated from rest, it's initial speed is 0, 27=0+a (6.75), a=4 m/s2
Answer:
α = 1.114 × 10⁻³ (°C)⁻¹
Explanation:
Given that:
Length of rod (L) = 1.5 m,
Diameter (d) = 0.55 cm,
Area (A) =
Radius (r) = d / 2 = 0.275 cm,
Voltage across the rod (V) = 15.0 V.
At initial temperature (T₀) = 20°C, the current (I₀) = 18.8 A while at a temperature (T) = 92⁰C, the current (I) = 17.4 A
a) The resistance of the rod (R) is given as:
Therefore the resistivity and for the material of the rod at 20 °C (ρ) is:
b) The temperature coefficient of resistivity at 20°C for the material of the rod (α) can be gotten from the equation:
Rearranging to make α the subject of formula: