Answer:
Input power, Ip = 4 Watts
Explanation:
Given the following data;
Power output = 0.8 Watts
Efficiency = 20%
To find the power input of the sunlight onto the solar panel;
Mathematically, the efficiency of a machine is given by the formula;
Substituting into the formula, we have;
Cross-multiplying, we have;
Input power, Ip = 4 Watts
Answer:
41.4 g
41.4 cm³
1.08695 g/cm³
Explanation:
= Density of water = 1 g/cm³
Mass of water displaced will be the difference of the
Mass of water displaced is 41.4 g
Density is given by
So, volume of bone is 41.4 cm³
Average density of the bird is given by
The average density is 1.08695 g/cm³
Answer:
c.
Explanation:
= Initial distance between asteroid and rock = 7514 km = 7514000 m
= Final distance between asteroid and rock = 2823 km = 2823000 m
= Initial speed of rock = 136 ms⁻¹
= Final speed of rock = 392 ms⁻¹
= mass of the rock
= mass of the asteroid
Using conservation of energy
Initial Kinetic energy of rock + Initial gravitational potential energy = Final Kinetic energy of rock + Final gravitational potential energy
Answer:
Diver hits the water with kinetic energy of 5000 J
Explanation:
We have given weight of the diver F = 500 N
Diver steps off a diving board which is 10 m above the water
So work don by diver
Now according to energy theorem work done is equal to kinetic energy
So kinetic energy will be equal to 5000 J
So diver hits the water with kinetic energy of 5000 J