40 moles of an ideal gas, maintained at a temperature of 500K, has its pressure decreased from 7 pa to 3 pa. If the ideal gas experiences no change in internal energy, what is the change in heat the gas experiences? a)1.41×10⁵
b)2.68×10⁵
c)-1.41×10⁵
d)-2.68×10⁵

Atotal charge of –6.50 µc is uniformly distributed within a sphere that has a radius of 0.150 m. what is the magnitude and direction of the electric field at 0.300 m from the surface of the sphere? a) 2.89 × 105 n/c, radially inward b) 6.49 × 105 n/c, radially outward c) 4.69 × 105 n/c, radially inward d) 9.38 × 105 n/c, radially outward e) 1.30 × 106 n/c, radially inward