A pickup truck has a period of vibration on its springs of 0.56 s when unloaded. With a 700 kg load in the truck the period increases to 0.62 s. The mass of the truck is equal to

a. 1300 kg

b. 3100 kg

c. 3800 kg

d. 860 kg

e. 570 kg

An electronic street billboard sign displays the temperature in the fahrenheit and celsius scale. At a certain time of the day, you observe that the fahrenheit scale reading is five times that of celsius scale reading. The outside temperature is equal to

a. + 7C

b. + 10C

c. - 10C

d. + 8C

e. - 4C