Explanation:
Weight (N) = Mass * Acceleration
75.74 kg = Mass * 9.8 m/sec^2
Mass = 7.72 kg
Weight = 75.74 N
Answer:
This assertion is false
Explanation:
It can be a said that when snow melts to liquid, then at that phase certain amount of energy was needed to change it from its solid state to liquid. The energy needed is given as:
Q=mL
Where m is the mass of snow.
L is latent heat of fusion.
So when there is the melting of snow from solid to liquid, thermal energy gotten from the surrounding gets absorbed so as to convert it into liquid phase.
Answer:
Substance A will release more heat.
Explanation:
Let suppose that both substances experiment an entirely sensible heat process and are incompressible and begin at the same temperature. Physically speaking, specific heat (
), measured in kilojoules per kilogram-degree Celsius, can be described by following expression:
(1)
Where:
- Released heat, measured in kilojoules.
- Sample mass, measured in kilograms.
, 
- Initial and final temperatures of the sample, measured in degrees Celsius.
If we know that 
, 
, 
and 
, then we have the following inequation:
Substance A will release more heat.
the net torque about the point (-1 m, 1 m) is 4 N-m.
The resultant force acting on the object is calculated as
R^2=(-5+3)^2+2^2=2.82 N
Distance of the point from the resultant force
d^2=(-1)^2+1^2=1.414
The net torque acting on the point (-1 m, 1 m) is
T=2.82×1.41=3.98 N-m
