Answer:
T = 30.42°C
Explanation:
According to the conservation of energy principle:
E = 120 KJ
mc = mass of copper = 13 kg
Cc = specific heat capacity of copper = 0.385 KJ/kg.°C
T2c = T2w = Final Equilibrium Temperature = T = ?
T1c = Initial Temperature of Copper = 27°C
T1w = Initial Temperature of Water = 50°C
mw = mass of water = 4 kg
Cw = specific heat capacity of water = 4.2 KJ/kg.°C
Therefore,
<u>T = 30.42°C</u>
Answer:
The acceleration of the sprinter is 1.4 m/s²
Explanation:
Hi there!
The equation of position of the sprinter is the following:
x = x0 + v0 · t + 1/2 · a · t²
Where:
x = position of the sprinter at a time t.
x0 = initial position.
v0 = initial velocity.
t = time.
a = acceleration.
Since the origin of the frame of reference is located at the starting point and the sprinter starts from rest, then, x0 and v0 are equal to zero:
x = 1/2 · a · t²
At t = 9.9 s, x = 71 m
71 m = 1/2 · a · (9.9 s)²
2 · 71 m / (9.9 s)² = a
a = 1.4 m/s²
The acceleration of the sprinter is 1.4 m/s²
C because you need to order it from fastest to slowest and the least amount of time taken is the fastest.
Answer:
Horizontal Motion, and Vertical Motion.
Explanation:
