An ideal transformer consists of a 500-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in the primary?
A) 0.75 A
B) 1.3 A
C) 12 A
D) 48 A
C
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Consider a situation where you exert a force F on a crate of mass m, moving it at a speed v a distance d across a floor in a time interval t.The kinetic energy of the crate is 1/2 mv2
a. True b. False Indicate whether the statement is true or false
A CD with a diameter of 12.0 cm starts from rest and with a constant angular acceleration of 1.00 
acquires an angular velocity of 5.00 rad/sec. The CD continues rotating at 5.00 rad/sec for 15.0 seconds and then slows to a stop in 12.0 second with a constant angular deceleration. What is the total acceleration of a point 4.00 cm from the center at the time 2.00 seconds from the start?
A. 0.450 
B. 0.314
C. 0.215
D. 0.165
E. 0.100
On a photograph of the Earth's moon, the moon measures 30 cm in diameter and a small crater measures 0.2 cm. The moon's physical diameter is 1738 km. What is the physical diameter of the small crater?
a. about 1738 km b. about 12 km c. about 520 km d. about 350 km e. about 3.5 km
Which star has the largest diameter?
a. white dwarf b. main sequence c. red giant d. supergiant e. regular giant