The temperature of an object is raised by 90oC . This is equivalent to what increase in its absolute temperature?
17. A supersonic aircraft produces a shock wave that describes a 30o angle. What happens to the angle of the cone as the aircraft travels faster?
18. A 2.0-ohm resistor is connected in a series with a 20.0 -V battery and a three-branch parallel network with branches whose resistance are 8.0 ohms each. Ignoring the battery’s internal resistance, what is the current in the batter? Show your work.
19. Gas A is composed of diatomic molecules (two atoms to a molecule) of a pure element. Gas B is composed of monoatomic molecules (one atom to a molecule) of another pure element. Gas A has three times the mass of an equal volume of gas B at the same temperature and pressure. How do the atomic masses of elements A and B compare?
20. Consider a model steel bridge that is 1/100 the exact scale of the real bridge that is to be built.
a. If the model bridge weighs 50 N, what will the real bridge weigh?
b. If the model bridge does not appear to sag under its own weight, is this evidence the real bridge, built exactly to scale, will not appear to sag either?
21. Calculate the water pressure in the pipes at the bottom of a high-rise building that is fed by reservoir 60 m above the roof top.
22. The atmosphere does not ordinarily crush cans. However, it will crush a can after it has been heated, capped, and cooled. Explain why this happens. Be sure to use complete sentences
23. When a 57-gram piece of aluminum at 100oC is placed in water, it loses 735 calories of heat while cooling to 30oC. Calculate the specific health capacity of the aluminum.
24. Your classmate says that if all the molecules in a particular liquid had the same speed, and some were able to evaporate, the remaining liquid would not undergo cooling. Do you agree or disagree and what is your explanation to support your answer.
25. Would it be correct to say the Doppler Effect is the apparent change in the speed of a wave due to the motion of the source? Be sure to fully explain your position using at least 3 complete content related sentences.
26. The equation E=hf describes the energy of each photon in a beam of light. If Planck’s constant, h, were larger, would photons of light of the same frequency be more energetic or less energetic. Be sure to explain using at least 3 content related sentences.
27. A radioisotope is place near a radiation detector, which registers 80 counts per second. Eight hours later, the detector registers five counts per section. What is the isotope’s half-life?
28. Write the nuclear equation that describes the following process. Uranium-235 undergoes an alpha decay to produce thorium-231.
29. If the uranium nucleus were split into three pieces of approximately the same size instead of two, would more energy or less energy be released? Defend your answer in terms of Figure 40.14 in your textbook.
30. According to chapter 13 in the course textbook, describe the time it would take for Earth to orbit the collapsed sun if the sun collapsed into a black hole.

1. How is electric potential energy similar to gravitational potential energy? How is it different? Where will an electron bound in an atom and have the largest electrical potential energy?
2. What is a transformer? Explain how a transformer works including specific details on step up and step down transformers.
3. Write at least 4 to 5 sentences on the different measurements that helped to calculate the speed of light. There are 3 specific experiments mentioned in your textbook.
4. Three equal-sized holes are drilled at the top, middle, and bottom of the side of a barrel filled with water. Describe the path (which is NOT speed) of water coming from each hole. Explain why water from the bottom home comes out the fastest
5. What caused magnetic fields? What happens If you keep breaking a magnet in two until you reach a single atom?
6. What is an electric motor? Explain its operation.
7. State Hooke’s law. A spring will stretch 12 cm when a 250-g mass is hung on it. If the 250-g mass is hung on two identical springs, hung sided by side, and both support the 250-g mass, how much will each spring stretch. EXPLAIN.
8. Use 4 to 5 complete sentences, explain the concepts of beats and how beats are produces. Please provide at least 2 examples.
9. Why do atoms have relatively the same size even though they may have widely different masses?
10. What is the period of a soundwave whose wavelength is 20.0 m? Use values from the book and show ALL of your work.
11. A 60-V potential different is applied across a parallel combination of a 10-ohm and 20-ohm resistor. What is the current in the 10-ohm resistor? Show your work.
12. What is the power dissipated by a toaster that has a resistance of 60 ohms and is plugged into a 120-V outlet? Show your work.
13. A step up transformer has 250 turns on its primary and 500 turns on it secondary. When the primary is connected to a 200 V and the secondary is connected to a floodlight that draws 5A, what is the power output? Please show ALL of your work.
14. What is the mass of air in a room that has dimensions of 10m x 20m x 4 m? Use values from the book to show your work.
15. About how much pressure do the feet of a 6000-kg elephant exert on the ground? Assume each foot has an area of 0.10 square meter. Please show all your work.

James operates an airplane that departs from JFK Airport with a constant net force of 40,000 N. The mass of James is 80 kg and the plane’s mass is 30,000 kg. What is the net force that acts on James?
2. Susan pushes her dad, David, on an ice rink with a force of 30 N. She weighs 45 kg and her dad weighs 100 kg. What are the accelerations of Susan and David?
3. Alice holds a black belt in Taekwondo and her fist has a mass of 0.5 kg. Her fist obtains a velocity of 5 m/s in 0.1 seconds from rest. Evaluate the average net force applied to the fist.
4. A lunar exploration vehicle was created by a research team. It weighs 3,000 kg on the earth. It needs an acceleration of 10 m/s2 on the moon. In order to have the same acceleration, what will be the net force acting on the vehicle on the earth?
6. You drive a 6,000 kg boat due north, while the wind exerts a force of 600 N due south and the water exerts a resistive force of 1,200 N due south. The generated force by the boat’s engines is 4,200 N. Find the magnitude and direction of the boat’s acceleration.
7. A machine accelerates a 5 kg missile from rest to a speed of 5 km/s. The net force accelerating the missile 500,000 N. How long does it take to arrive at the speed of 5 km/s?
8. Peter found an amazing fact in an amusement park when he tried to ride the Magic Mountain Superman. Powerful magnets accelerate a car and its riders from zero to 45 m/s in 7 seconds. Suppose the mass of the car and riders is 5,600 kg. What is the average net force exerted on the car and riders by the magnets?
9. Two forces of 10 N and 30 N are applied to a 10 kg box. Find (1) the box’s acceleration when both forces point due east and (2) the box’s acceleration when 10 N force points due east and 30 N force points due west.
10. When a 60 g (=0.06 kg) tennis ball is served by a newly invented machine, it accelerates from zero to 50 m/s. The ball experiences a constant acceleration due to the impact with the racket over a distance of 0.5 m. What is the net force acting on the ball? Use the formula: a= (vf2-vi2)/2d regarding the relation among acceleration a, final velocity vf, initial velocity vi and the traveled distance of an object d.
11. Cole is riding a sled with initial speed of 5 m/s from west to east. The frictional force of 50 N exists due west. The mass of the sled and Cole together is 100 kg. How far does the sled go before stopping? Use the formula: a= (vf2-vi2)/2d regarding the relation among acceleration a, final velocity vf, initial velocity vi and the traveled distance of an object d.