Answer:
<em>Answer: B. 49 N</em>
Explanation:
<u>Friction Force
</u>
When an object is at rest on a rough surface, it encounters a friction force that opposes motion.
The friction force when an object is moving on a horizontal surface is calculated by:

Where
is the coefficient of static friction and N is the normal force.
If no forces other then the weight and the normal are acting upon the y-direction, then the weight and the normal are equal in magnitude:
N = W = m.g
Thus, the friction force is:
We are given the coefficient of static friction
and the mass of the object m=10 Kg. The minimum force needed to make it start moving is the maximum friction force:
Fr=0.5*10*9.8
Fr = 49 N
Answer: B. 49 N
Answer:
v > ii > iii > i > iv
Explanation:
The speed of light does not depend on the wavelength of light rather the medium through which it passes through.
v) The speed of light in a vacuum is maximum = 300000 km/s
ii) The speed of light in air = 2999910.026 km/s
iii) The speed of light in water = 2255639.097 km/s
i) The speed of light in glass = 1973684.210 km/s
iv) The speed of light in diamonds = 1239669.421 km/s
Hence the ranking will be
v > ii > iii > i > iv
10 and 40 would be your answer i believe.
The correct matches are as follows:
<span>1. Mechanical Energy
</span>This is the energy of motion and position - Kinetic Energy and Potential Energy are included here.
<span>
2. Electrical Energy
</span>This is the type of energy that is given off as a result of electrons (charges!) moving through a conductor.
<span>
3. Light Energy
</span>This is the only form of energy we can see with our eyes!
<span>
4. Thermal Energy
</span>This is heat energy! It can be transferred through conduction, convection, or radiation.
<span>
5. Sound Energy
</span>This is energy that is transmitted through vibrations.
<span>
6. Kinetic Energy
</span>This is the energy that all moving objects have. <span>
7. Potential Energy
</span>This is stored energy, waiting to be used!