Which statements about surface gravity are true? Select all that apply.
a. Earth's surface gravity has no effect on the tides.
b. A 180-pound person on Earth weighs 30 pounds on the moon.
c. A space ship has the same mass on Earth as it has on the moon.

Aray of light traveling parallel to the principal axis of a concave mirror will be reflected through the mirror's

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

What is the magnitude of the acceleration vector which causes a particle to move from velocity −5i−2j m/s to −6i+ 7j m/s in 8 seconds. answer in m/s.