Engine I takes in 100 J of heat from a hot reservoir and does 20 J of work. Engine 2 takes in the same amount of
heat from the hot reservoir and does 25 J of work. Is the
efficiency of engine 1 greater than, less than or equal to
the efficiency of engine 2? Explain.

Exercise 2. find the wavelength of a photon emitted when an electron jumps from the n = 3 energy level down to the n = 2 energy level. where is this photon in the electromagnetic spectrum?

Sunidhi made a study chart about changes in states of matter. which headings best complete the chart?

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.