Assignment:
QUESTION 1 The trapping of light in "light pipes," or fiber optics, is due to
A. diffraction
B. refraction
C. absorption of the outside light
D. total internal reflection
QUESTION 2 A spacecraft in space keeps going at the same velocity, even without firing its rockets, in accordance with the ___________
A. first law of motion
B. second law of motion
C. third law of motion
D. fourth law of motion
QUESTION 3 A 9.0 gram bullet fired from a gun travels at 800 m/s. What is the bullet's kinetic energy in Joules?
A. 1.1
B. 89
C. 7.2
D. 2.9 x 103
QUESTION 4 What is the speed of light (m/s) in quartz that has a refractive index of 1.42?
A. 3.00 x 108
B. 1.00 x 108
C. 2.11 x 108
D. 1.42 x 108
QUESTION 5 Normal room temperature is 68oF. What is the temperature in Kelvin degrees?
A. 556 K
B. 405 K
C. 375 K
D. 293 K
QUESTION 6 What is the acceleration of a car that changes its speed from 0 to 60mi/h in 10 s?
A. 27 m/s2
B. 9.8 m/s2
C. 2.7 m/s2
D. 10 m/s2
QUESTION 7 How much potential energy needs to be provided by a 50 kg person to climb up a 0.20 m step?
A. 0.04 J
B. 10 J
C. 250 J
D. 98 J
QUESTION 8 The Sun's rays are transmitted to the Earth by means of
A. radiation
B. convection
C. temperature
D. conduction
QUESTION 9 The Bullet trains (Shinkansen) of Japan travel at a speed of 275 km/h. What is this speed in m/s?
A. 275
B. 763.0
C. 0.076
D. 76.4
QUESTION 10 The standard unit of time, the second, is now defined with reference to
A. the Earth's revolution
B. the mean solar day
C. the cesium-133 atom
D. the Earth's rotation
QUESTION 11 A 1000 kg car is driven around a circular path with a radius of 60.0 m, at a uniform rate of 12.0 m/s. What is the centripetal force acting on the car?
A. 400 N
B. 200 N
C. 9.8 x 103 N
D. 2.4 x 103 N
QUESTION 12 The standard unit of length, the meter, is now defined with reference to
A. a meridian on the Earth
B. the French metre
C. the speed of light
D. a platinum-iridium bar
QUESTION 13 During a firework display, a spectator records 15.0 s between observing a colorful display of light and hearing the resulting sound. Approximately, how far is the spectator from the firework site? Assume speed of sound is 344m/s.
A. 516 m
B. 5.2 mi
C. 5.16 km
D. 22.9 m
QUESTION 14 A transformer with 3000 turns in its primary coil has to decrease the voltage from 2200 Volts to 110 Volts for home use. How many turns should there be on the secondary coil?
A. 300
B. 150
C. 6000
D. 30
QUESTION 15 Waves moving on a lake have a speed of 2.0 m/s and a distance of 0.75 m between adjacent crests. What is the frequency of the waves in Hz?
A. 1.5
B. 2.7
C. 0.375
D. 0.5
QUESTION 16 Which of the following equations describes the relationship between current, resistance, and voltage in an electrical circuit?
A. V = I /R
B. V = R/ I
C. V = IR
D. V = RI2