# No Work Is Shown Only Answers

1. (TCO 1) What is a photon? (Points : 7)
A photon is a particle with no mass that carries electromagnetic energy or radiation. There is no such particle. A photon is a subatomic particle that exists within an atom. A photon is a particle that exists in space and can not be detected on the earth.2. (TCO 1) Consider the following equation: A = (+ 1)2. This equation can also be written as _____. (Points : 7) s = A – 1 s = ÖA s =ÖA – 1 s =1 – ÖA
Question 3. 3. (TCO 1) The unknown value of x in the equation is _____. (Points : 7)
1/4 16/9 2/3 8/6
Question 4. 4. (TCO 1) The temperature, T (in ºF), of a car’s radiator during the first 4 minutes (t £ 4) is given by = 6.2t2 +12t +32. How long does it take the temperature to reach 120 ºF after the car has begun operating? (Points : 7)
5.1 min 3.2 min 1.74 min 2.92 min
Question 5. 5. (TCO 1) Near the surface of the earth, objects will fall according to the equation = (4.9) tvot. A projectile is thrown downward with vo= 5 m/s from the top of a 56 m cliff. How long does it take to hit the ground? (Points : 7)
6.5 s 1.1 min 2.91 s 1.71 s
Question 6. 6. (TCO 1) The resonance frequency of an LC circuit can be found from
. What is L if C = 400 pF and f= 15,000 Hz? (Points : 7)
281 mH 18.1 H 301 mH 165 mH
Question 7. 7. (TCO 1) Twice the square of a positive number increased by three times the number is 14. Find the number. (Points : 7)
4 5 7 2
Question 8. 8. (TCO 1) Which of the following formulas is solved for the unknown quantity a? (Points : 7)
a = 1/2a + b a = 3a – b a = sinQ / 50 Q = sin / 50
Question 9. 9. (TCO 1) At 5 minutes after the hour, a minute arm forms a 30 degree angle. At 15 minutes, it forms a 90 degree angle, and at 20 minutes it forms a 120 degree angle. What angle will it form at 30 minutes? (Points : 7)
30 degrees 180 degrees 0 degrees 270 degrees
Question 10. 10. (TCO 1) A ladder base is 3 m away from a house, and the fully extended ladder is 7.6 m long when it leans against the house. How high does the ladder reach on the house? (Points : 7)
10.6 m 4 m About 6.9 m About 7.6 m
Question 11. 11. (TCO 1) You want to estimate the height of the Empire State Building. You start at its base and walk 15 m away. Then you approximate the angle from the ground at that point to the top to be 88 degrees. How tall do you estimate the Empire State Building to be? (Points : 7)
430 m 195 m 247 m 320 m
Question 12. 12. (TCO 1) To make a bridge across the swiftly flowing upper Niagara river, it was necessary to fly a kite across in order to span the river for the first time. If 300 m of kite string was let out as the kite was directly over the opposite bank, and the kite string formed a 50º angle with the level ground, how wide was the river span? (Points : 7)
about 6.4×10-1 m 40º about 230 m about 193 m
Question 13. 13. (TCO 1) Two parallel crosswalk lines cross a street at a 30 degree angle to connect a pedestrian mall. What is the largest angle formed by the intersection of the crosswalk lines and the street? (Points : 7)
90 degrees 30 degrees 60 degrees 150 degrees
Question 14. 14. (TCO 1) The side b of the triangle below is equal to _____.

(Points : 7)
21.1 m 15.5 m 24.7 m 32.0 m
Question 15. 15. (TCO 1) A mechanical lift raises a 725 kg automobile by 2.0 m for service. How much work was done by the lift?(Points : 7)
80 kJ 14,210 J 1,450 J 7,200 J
Question 16. 16. (TCO 1) A model helicopter pulls into a tight circular curve of radius 24.0 m. The 450 g helicopter is traveling at 20m/s. The helicopter is experiencing a centripetal force of _____. (Note: av2/r.) (Points : 7)
24.0 N 9.8 N 7.5 N
Question 17. 17. (TCO 1) Convert 5p radians to degrees.
180° 900° 360° 560°
Question 18. 18. (TCO 1) To change a flat tire with a lug wrench 1.5 ft long, you need to exert a force of at least of 53.0 lb. The minimum required torque is about _____. (Points : 7)
53 ft.lb 80 ft.lb 47 ft.lb 99 ft.lb
Question 19. 19. (TCO 1) A bicycle wheel turns 32p rad during 42.8 s. What is the angular velocity (w = Q / t) of the wheel? (Points : 7)
About 6.23 rad/s About 2.35 rad/s About 3.6 rad/s About 16.4 rad/s
Question 20. 20. (TCO 1) A motorcycle wheel turns 76p rad during 36.0 s. What is the angular velocity (w = Q / t) of the wheel? (Points : 7)
6.63 rad/s 12.7 rad/s 3.6 rad/s 16.4 rad/s
Question 21. 21. (TCO 1) What is the difference between mass and weight? (Points : 7)
Mass is measured in newtons, whereas weight cannot be measured. The mass of an object is measured in kilograms and is a constant, whereas its weight can change depending on where it is. The mass and the weight are the same for a given object. There is more mass in a king-size pillow than a car battery.
Question 22. 22. (TCO 1) Electromagnetic waves travel at speeds of _____. (Points : 7)
340 m/s in vacuum 9 x 105 m/s in water 3 x 108 m/s in free space (vacuum) a very fast object, and therefore it is hard to measure the speed.
Question 23. 23. (TCO 1) A system consisting of two fixed and two movable pulleys has a mechanical advantage of 4.00. If a force of 124 N is exerted, which weight can be raised? (Points : 7)
31 N 248 N 496 N 575 N
Question 24. 24. (TCO 1) A mechanical lift raises a 325 kg automobile 2.00 m for servicing. How much work was done by the lift?(Points : 7)
650 N m 1,525 N m 2,756 N m 6,370 N m