An engine takes in 200 J of heat, expels 40 J of heat, and does 160 J of work. What is the efficiency of the engine?

A. 40%

B. 60%

C. 80%

D. 20%

To measure the height of the cloud cover at an airport, a worker shines a spotlight upward at an angle 75° from the horizontal. An observer D = 510 m away measures the angle of elevation to the spot of light to be 45°.

Consider a uniformly wound solenoid having N=210 turns, length l=0.18 m, and cross-sectional area A = 4.00 cm2. Assume l is much longer than the radius of the windings and the core of the solenoid is air. (A) Calculate the inductance of the solenoid.

What form of nitrogen are most plants able to absorb

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.

7. How much support force does a table exert on a book that weighs 15 N when the book is placed on the table? - What if a hand pushes down on the book with a force of 20 N? - What if a rope lifts up on the book with a force of 10 N?

3. What is the kinetic energy of a 1300 kg car moving at 26.3 m/s?

Kendall has empty graduated cylinder with markings and an identical graduated cylinder partway filled with water. She also has a balance and a marble. Which statement best describes what Kendall can do? A.

2. With regard to the pH scale, a solution with a pH A. higher than 7 is considered an acid. B. lower than 7 is considered basic. C. of 6 is considered neutral. D. close to 14 is considered a strong base.

If a car rolls gently off a vertical cliff, how long does it take to reach 90km/hr.

In the game of volleyball, what skill relates to Newton's second law