The gravity force between ourselves and the objects around us is extremely small as gravity is a very weak force. The electric force is far stronger than the gravity force. Since we and the objects around us are composed of charged particles, why don’t we experience huge electrical forces...
Homework Statement
A barefoot water skier is towed behind a speedboat at constant velocity.
(i)
(a) Draw a side on diagram of the water skier and on your diagram label the directions and names of the forces acting on the water skier.
(b) What are two relationships between the magnitude...
Homework Statement
The solar system is situated 26,000 light years from the centre of our galaxy, the Milky Way, and it orbits the centre at a speed of 220 km/sec.
Calculate the time required in millions of years for one orbit.
(NOTE: The circumference of a circle = 2 pi r where r is...
Homework Statement
1. (a) Given that the distances to the sun and the moon are approximately 150 million km and 400,000 km respectively. and that the radius of the moon is 1740 km , estimate the radius of the sun.[Hint:k=9*10^9 Nm^2/C^2, g=10ms^-2) ]
(b) Ancient astronomers knew that the...
earth was not flat because ??
ancient astronomers knew that the Earth was not flat because it cast a circular shadow during a lunar eclipse. state another observation that led them to the same conclusion