Answer:
Explanation:
Given
mass of sled =26 kg
coefficient of static friction
coefficient of kinetic friction
In order to move sled from rest we need to provide a force greater than static friction which is given by
After Moving Sled kinetic friction comes in to play which is less than static friction
therefore minimum force to keep moving sledge at constant velocity is 18.34 N
Power Rating = W
Time for which the machine is operating = 2 hours
Time in seconds = 2 × 60 × 60
Time = 7200 seconds
Now, we need to use the formula for work done.
Work done = Power × time
Work done =
Work done = Joules
Hence, work done by the machine in 2 hours is J.
That's actually a pretty good definition of ENERGY .
Answer:
A. False, frequency can increase or decrease wavelength.
For example: a high frequency would mean there are shorter wavelengths that occur in a period. Meanwhile, a low frequency would indicate that the wavelengths are longer and in longer periods.
Answer : The value of is -166156 J and equilibrium composition should favor products at standard conditions.
Explanation :
Now we have to calculate the Gibbs free energy.
As we know that,
where,
= standard Gibbs free energy = ?
= standard enthalpy = -249 kJ = -249000 J
= standard entropy = -278 J/K
T = temperature of reaction =
Now put all the given values in the above formula, we get:
- A reaction to be spontaneous when and reaction will be favored in the forward direction that means favored in products.
- A reaction to be non-spontaneous when and reaction will be favored in the backward direction that means favored in reactants.
As the value of is less than zero that means the reaction is spontaneous and reaction will be favored in the forward direction that means favored in products.
Hence, the value of is -166156 J and equilibrium composition should favor products at standard conditions.