What forces act upon an object dropped in a vacuum

The weight of 80 kg of mass on mercury is 296 N and almost identical to the weight of the same mass on Mars but mercury has much less mass than Mars explain how this can be. (what else could affect gravitational force?)

State two ways in which polarisation reduces the current produced by a simple cell

The hydrocarbon C2H4 is a member of the_series.

A green dot in the middle of 4 concentric circles. The first away from the green dot is labeled n = 1. The second circle away from the green dot is labeled n = 2.

An athlete is running at a constant velocity with a javelin held in his right hand. the force he is applying on thejavelin as he carries it is 5.0newtons. if he covers a distance of 10 metrs, what work has he done on the javelin?.

Suppose s (t) is the position of an object moving along a line at time t is greater than or equal to 0. What is the average velocity between the times t=a and t=b? What is the instantaneous velocity at t=a?

Estimate how long it would take one person to mow a football field using an ordinary home lawn mower. suppose that the mower moves with a 1-km/h speed, has a 0.5-m width, and a field is 360 ft long and 160 ft wide. 1 m = 3.281 ft.

Badri makes the table below to review the factors that affect the electric force between objects. Which change will correct the error in Badri's table?

A star with the same mass of the sun has a newly discovered planet whose semi-major axis of 2.48 au and an eccentricity of 0.08. what is the aphelion distance of the new planet

A weather balloon is inflated to a volume of 2.2 x 10^3 L with 374 g of helium. What is the density of helium in grams per liter?