Answer:
22425 J
Explanation:
From the question,
Applying
Q = cm(t₂-t₁).................. Equation 1
Where Q = Thermal Energy, c = specific heat capacity of aluminium, m = mass of aluminium, t₂ = Final Temperature, t₁ = Initial Temperature.
Given: c = 897 J/kg.K, m = 1.0 kg, t₁ = 50 °C, t₂ = 25 °C (The final temperature is reduced by half)
Substitute these values into equation 1
Q = 897×1×(25-50)
Q = 897×(-25)
Q = -22425 J
Hence the thermal energy lost by the aluminium is 22425 J
Answer:
Explanation:
s = s₀ + v₀t + ½at²
s = 0 + 0(15) + ½(6)(15²)
s = 675 m
Not sure what the free fall acceleration is needed for, but if the object is dropped from a high enough point, it will travel in 15 seconds
s = ½10(15²) = 2250 m if air resistance is ignored
Answer:
2.4086 * 10^(-4) m^3
Explanation:
Volume of sphere = 4/3 * pi * r1^3
Volume of cylinder = pi*r2^2*h
r1 = 0.05 m
r2 = 0.03 m
Hence,
Resulting Volume = Volume of sphere - Volume of cylinder
Answer:
25.52 m
Explanation:
Relative speed between the person and I would be the difference of our speeds
Time taken by me to walk up to the person = 14.5 s
Distance is given by
The person was 25.52 m ahead of me when I started running
It's a change of motion, in simple terms.
