As shown, a(n) ______________ is added to help focus the red and yellow images

Iced tea is made by adding ice to 1.9 kg of hot tea, initially at 90.0°C. How many kg of ice, initially at 0°C, are required to bring the mixture to 15.0°C? (Lf = 3.33 × 10^5 J/kg, cw = 4 186 J/kg/°C)

a. 1.6 kg b. 2.1 kg c. 1.5 kg d. 3.1 kg e. 1.7 kg

What is the diameter of the galaxy, in km?

A) about 1 billion trillion km (1021 km) B) about 10 trillion km (1013 km) C) about 1 million trillion km (1018 km) D) about 100,000 km (105 km)

Bragg reflection results in a first-order maximum at 12.2°. In this case, at what angle would the second-order maximum occur?

a. 24.4° b. 12.2° c. 7.79° d. 25.0° e. 78.5°

Conservation of Momentum: A very elastic rubber ball is dropped from a certain height and hits the floor with a downward speed v. Since it is so elastic, the ball bounces back with the same speed v going upward. Which of the following statements about the bounce are correct? (There could be more than one correct choice.)

A. The ball had the same momentum just before and just after the bounce. B. The magnitude of the ball's momentum was the same just before and just after the bounce. C. The ball's momentum was conserved during the bounce. D. None of these statements are correct.