Energy or heat can be calculated in terms of the mass, temperature, and specific heat of a substance. This is given by the equation:
U = mCpΔT = mCp(Tf-Ti)
where:
m = mass
Cp = specific heat
ΔT = temperature difference
For this problem, you need to get the specific heat of granite which can be found in reliable chemistry/engineering books or websites. According to Engineering Toolbox website, the Cp of granite is 790 J/(kg-°C).
U = 17 kg (790 J/(kg-°C)) (21-45) = - 322,320 Joules
*Note: the sign is negative because energy was released
Here it is the use of vector and conservation of momentum !
so,
√(16^2+21^2) ×1000= 3000 v
v =8.8 m/s
so answer is B !
if you have any doubt, you can ask ! just comment !
KE= 0.5(m)(v^2)
KE= 250,000 J
Answer:
F = m a = m v / t where v is the change in velocity in time t
F = p / t since m v is equal to p
F = 2.2 (kg m / s) / 1.1 s = 2 kg-m / s^2 = 2 N
Or you can use the impulse equation
A. it is based on scientific evidence