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Two Spheres of radius 6cms, having charges 10^-8C, -3×10^-8C. Find the potential of 2 spheres and potential at midpoint of centres if the distance between centres is 2m.
Physics
Two planets undertake uniform circular motion around a star. For the two planets, the mass, speed and distance from the star's centre is respectively m,v, r and m',v', r'. If r'=4r , the ratio T'/T of the periods of revolution of the planets is? The answer is 8 however I am not sure which formula to use because the ones I have used do not give me that answer.
Physics
Force F acts on an object of mass 2kg on a smooth floor produces an acceleration of 6m/s^-2. What is the force needed to accelerate for another object of mass 3kg at 9m/s^-2
Physics
State five uses of solar energy to man.
A lake is 10m deep and 1km by 1km in area. All the water goes over a waterfall 300 m high. How much electrical energy is produced at 100% efficiency from this energy supply?
A lake is 10m deep and 1km by 1km in area. All the water goes over a waterfall 300 m high. How much electrical energy is produced at 100% efficiency from this energy supply?
Explain the term energy chain
i. Describe the energy chain which occurs at a power station which uses coal as fuel.
ii. Account for energy losses if production of electrical energy is not at 100%.
i. Describe the energy chain which occurs at a power station which uses coal as fuel.
ii. Account for energy losses if production of electrical energy is not at 100%.
Physics
Derive an expression for the maximum potential energy of the pendulum bob of mass m in terms of the length, L and angular displacement, θ of the swinging pendulum.
Physics
(a) Explain the term energy transformation.
(b) Describe the energy transformation occurring in a swinging simple pendulum. Justify each transformation along the path of swing.
(b) Describe the energy transformation occurring in a swinging simple pendulum. Justify each transformation along the path of swing.
Physics
A projected demand for electricity is 25,000 MW in a year. The electricity is
produced by a big hydroelectric station and the water level in the deep
reservoir is allowed to fall 100 m to generate the electricity. How many square kilometres must the reservoir cover to produce the demand electricity in a year. Assume 100% efficiency and 10 m as the height of the reservoir.
let Acceleration of gravity (g) = 9.8 ms-2
Weight of 1 m3 of water=9800 N
365 days= 1 year
Average solar energy flux= 500 Wm-2
Density of water = 1000 kgm-3
produced by a big hydroelectric station and the water level in the deep
reservoir is allowed to fall 100 m to generate the electricity. How many square kilometres must the reservoir cover to produce the demand electricity in a year. Assume 100% efficiency and 10 m as the height of the reservoir.
let Acceleration of gravity (g) = 9.8 ms-2
Weight of 1 m3 of water=9800 N
365 days= 1 year
Average solar energy flux= 500 Wm-2
Density of water = 1000 kgm-3
Physics
State three factors that must be considered in any practical application of
renewable energy
renewable energy
Physics
A fossil fuel electric-power plant consumes 9800 Btu to produce 1kWh of electrical energy. Calculate the conversion efficiency if 1kWh is equivalent to 3410 Btu.
