T Tauri stars are post-main-sequence stars
Indicate whether the statement is true or false
False
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If 30 kJ of heat flows into a system and the internal energy increases by 15 kJ, then what is the work done by or on the system?
A. +85 kJ B. +65 kJ C. -65 kJ D. +15 kJ E. -15 kJ
A car with good tires on a dry road can decelerate at about 5.0 m/s2 when braking. Suppose a car is initially traveling at 55 mi/h. (a.) How much time does it take the car to stop? (b.) What is the stopping distance?
What will be an ideal response?
About how much CO2 comes out of the stack of a coal-burning plant that consumes one ton of coal?
A) Much less than one ton. B) Anywhere from 1 ton to about 10 tons, depending on the design of the plant. C) About 3 tons. D) None, because the CO2 is precipitated as a solid. E) About 1 ton.
A source of sound has an intensity I1 and when its sound level is measured at a fixed distance the value found is 70 dB. The source then has its intensity increased to I2 and when its sound level is measured at the same distance the value found is 96 dB. What is the ratio I2/I1?
a. 26 b. 400 c. 600 d. 14