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

In which situation is the acceleration of a car negative? question 5 options: a)the velocity of a car was 75 km/hr over 4 hours. b)the velocity of a car reduced from 50 km/hr over one minute. c)the velocity of a car increased from 40 km.h to 75 km/h over 15 minutes. d)the velocity of a car was 45 km/hr at 2: 00pm and at 4: 00pm its velocity was 85 km/ht.