Two masses are connected by a string which passes over a pulley with negligible mass and friction. One mass hangs vertically and one mass slides on a 30.0 degrees frictionless incline. The vertically hanging mass is 6.00 kg and the mass on the incline is 4.00 kg. The acceleration of the 4.00 kg mass is
A. 1.98 
B. 3.92
C. 5.75
D. 6.86
E. 7.84
E. 7.84
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The magnetic field inside a circular loop of wire of radius 30 cm increases at a constant rate from 2.0 × 10^–3 T to 3.5 × 10^–3 T in 0.47 s. If the resistance of the loop is 0.31 ?, what is the current in the loop?
a. 7.4 × 10^–4 A b. 5.8 × 10^–4 A c. 2.9 × 10^–3 A d. 5.8 × 10^–3 A
Approximately how many radioactive atoms are present in a tritium sample with an activity of 0.6 × 10^-6 Ci and a half-life of 12.3 years? (1 Ci = 3.7 × 10^10 decays/s)
a. 4 × 10^10 c. 7 × 10^8 b. 2 × 10^8 d. 1 × 10^13
Rotational Kinetic Energy: The L-shaped object shown in the figure consists of three small masses connected by extremely light rods. Assume that the masses shown are accurate to three significant figures. How much work must be done to accelerate the object from rest to an angular speed of 3.25 rad/s (a) about the x-axis, (b) about the y-axis?
Fill in the blank(s) with the appropriate word(s).
The 500-m-long spaceship Springbrake is at rest on the planet Hitest for refueling. Another spaceship, Summerbrake, passes parallel to Springbrake at 0.600c. The crew on Springbrake measure the length of Summerbrake as it passes and find that the length they measure is exactly the same as the known 500-m rest length of Springbrake. If Summerbrake were at rest next to Springbrake, its length would then be measured to be
A. 180 m. B. 320 m. C. 500 m. D. 625 m. E. 781 m.