*100 points, do all if not most of the questions listed, you*
dimensional analysis
1a. (25km/5)(1000m/1km)(1h/3600s) =
carry out the following conversions using the factor-label method. show all of your work !
2a. how many seconds are in a year?
2b. convert 28km to cm
2c. convert 45kg to mg
2d. convert 85cm/min to m/s
2e. convert the speed of light, 3x10^8 to km/day
2f. convert 823nm to m
2g. 8.5cm^3 to m^3

A30 kg weight lies on top of a massless piston of area a = 0.01 m2 the exterior air is at a (constant) p =1 atm and t = 27 c. the interior gas is 0.4 moles of (ideal) n2 and it has initial temperature 27.00 degrees c. 1. what is the initial pressure in the interior? a. 29.4 kpa b. 130.7 kpa c. 101.3 kpa the next three questions concern what happens when an amount of heat q is slowly added to the interior, raising the piston by 1 mm and raising the interior temperature to 27.40 c

The mass of a bowling ball is 10 kg and the mass of a ping pong ball is 0.015 kg. if the two objects are 5 meters apart, what is the gravitational force ?

Apositive charge moves in the direction of an electric field. which of the following statements are true? check all that apply. check all that apply. 1.the potential energy associated with the charge decreases. 2. the electric field does positive work on the charge. 3. the electric field does negative work on the charge. 4. the potential energy associated with the charge increases. 5. the electric field does not do any work on the charge. 6. the amount of work done on the charge cannot be determined without additional information.