Explanation:
Table A: Calculation of Density for Regularly Shaped Solids
Table tennis ball Golf ball
"Mass
(g)"
Diameter (cm)
Radius (cm)
Estimated volume (cm3)
Estimated density (g/cm3)
"Prediction of buoyancy
Circle one."
"Observation of buoyancy
Circle one."
Initial volume of water (cm3)
Final volume of water (cm3)
Change in volume (cm3)
Calculated density (g/cm3)
Error (%)
4
Explanation:
At the moment, high tides occur twice a day. So if the moon orbits the earth twice as fast, high tides will occur twice as many, which means four times a day.
(C) 200 N
Explanation:
The acceleration due to gravity on earth
is given by

where
= universal gravitational constant
= mass of the earth
= radius of the earth
Planet Krypton has twice the mass of earth and 3 times the radius so its acceleration due to gravity
is



or

If we multiply both sides by Superman's mass, we get his weights on both planets:


The North Star, or Polaris, is the brightest star in the constellation Ursa Minor, the little bear (also known as the Little Dipper). As viewed by observers in the Northern Hemisphere, Polaris occupies a special place