At which stage in a Sun-like star's life is its core the least dense?
A) Main Sequence
B) Subgiant Branch
C) Helium Fusion
D) Planetary Nebula
E) White Dwarf
A
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A 50-kg child riding a Ferris wheel (radius = 10 m) travels in a vertical circle. The wheel completes one revolution every 10 s. What is the magnitude of the force on the child by the seat at the highest point on the circular path?
A. 0.29 kN B. 0.49 kN C. 0.69 kN D. 0.20 kN E. 0.40 kN
We want to determine experimentally the specific heat of a 3-gram iron ingot whose mass is known. The ingot is heated to 100°C and it is placed in a 200-gram sample of water whose initial temperature is 20°C. We would expect the final temperature of the water to be around
1.100°C. 2.70°C. 3.40°C. 4.20°C.
Electric Field of Point-Charges: What is the magnitude of the electric field 2.8 cm from a tiny object that carries an excess charge of -16 nC? (k = 1/4??0 = 9.0 × 109 N ? m2/C2)
A. 180,000 N/C B. 5100 N/C C. 1.8 × 1014 N/C D. -180,000 N/C E. -5100 N/C
A road bicycle racer rides down the highway from Pike’s peak. During one stretch of the ride, he descends 150 m while accelerating from 35 km/hr to some final speed. Assuming rolling friction and air resistance to be negligible, what is that final speed?
A. 113 km/h B. 118 km/h C. 148 km/h D. 169 km/h