Uniform Circular Motion: A car moving at a steady 10 m/s on a level highway encounters a bump that has a circular cross-section with a radius of 30 m. The car maintains its speed over the bump. What is the normal force exerted by the seat of the car on a 60.0-kg passenger when the car is at the top of the bump?
A. 200 N
B. 390 N
C. 790 N
D. 490 N
E. 590 N
Answer: B
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According to the Maxwellian speed distribution, as the temperature increases the number of molecules with speeds within a small interval near the most probable speed:
A. increases B. decreases C. increases at high temperatures and decreases at low D. decreases at high temperatures and increases at low E. stays the same
A train starts from rest and accelerates uniformly until it has traveled 5.6 km and acquired a forward velocity of The train then moves at a constant velocity of for 420 s. The train then slows down uniformly at until it is brought to a halt
The acceleration during the first 5.6 km of travel is closest to which of the following? A) 0.16 m/s^2 B) 0.14 m/ s^2 C) 0.17 m/ s^2 D) 0.19 m/ s^2 E) 0.20 m/ s^2
Three Carnot engines operate between temperature reservoirs as follows: Engine A: Th = 1300 K, Tc = 1000 K; Engine B: Th = 1000 K, Tc = 700 K; Engine C: Th = 500 K, Tc = 350 K. Which two engines have the same thermal efficiency?
a. A and B b. B and C c. A and C d. No two have the same thermal efficiency.
On its icy surface, Uranus' satellite Ariel has smooth valleys with few craters. Other areas are rough with many craters. Based on this, it can be concluded that
a. valleys are young and the rough areas are old b. the valleys are old and the rough areas are young c. both valleys and rough areas are young d. both valleys and rough areas are old