A car enters a level, unbanked semi-circular hairpin turn of 100-m radius at a speed of 28 m/s. The coefficient of friction between the tires and the road is ? = 0.800 . If the car maintains a constant speed of 28 m/s, it will
a. attempt to dig into the road surface.
b. tend to veer toward the center of the semicircle.
c. arrive safely at the end of the semicircle.
d. tend to veer toward the outside of the circle.
e. veer toward the center for the first quarter-circle, then veer toward the outside for the second quarter-circle.
c
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A dragster drives a quarter mile (402 m) at a constant rate of acceleration, starting from rest and finishing the race at a final speed of 450 km/hr. If the mass of the dragster is 975 kg, together with its driver, and rolling friction is ignored, what average power was developed by the engine, if 50% of the power developed by the engine was delivered to the wheels?
A. 4.7 MW B. 1.2 MW C. 0.6 MW D. 2.4 MW
Einstein performed thought experiments to understand the implications of the postulates of special relativity because
A. he was too poor to afford the necessary experimental apparatus. B. did not know how to build an apparatus that would test his ideas. C. he could not carry out the experiments alone and no other scientists would work with him. D. the speeds involved are too large to easily generate.
The maximum permissible workday dose for occupational exposure to radiation is 26 mrem
A 55-kg laboratory technician absorbs 3.3 mJ of 0.40-MeV gamma rays in a workday. The relative biological efficiency (RBE) for gamma rays is 1.00. What is the ratio of the equivalent dosage received by the technician to the maximum permissible equivalent dosage? A) 0.32 B) 0.30 C) 0.25 D) 0.23 E) 0.28
In an LCR series circuit the capacitive reactance is 24 W. If the AC frequency halves, what will be the resulting capacitive reactance?
a. 24 W b. 48 W c. 12 W d. Additional information is need to find the value.