A car moving at a steady 10 m/s on a level highway encounters a depression that has a circular cross-section with a radius of 30 m
The car maintains its speed as it drives through the depression. What is the force exerted by the seat of the car on a 60.0-kg passenger when the car is at the bottom of the depression?
A) 200 N
B) 390 N
C) 790 N
D) 490 N
E) 590 N
C
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The expansion rate of the Universe is:
A) increasing. B) decreasing. C) constant. D) different in different directions. E) independent of time.
A 20.0-N box rests on a 50.0-N box on a perfectly smooth horizontal floor. When a horizontal 15.0-N pull to the right is exerted on the lower box (see figure), both boxes move together
Find the magnitude and direction of the net external force on the upper box. What will be an ideal response?
A battery is used to light a bulb as shown. An identical battery is connected by closing switch S. What happens to the bulb?
1.The bulb goes out.
2.The bulb gets noticeably dimmer.
3.The bulb gets very slightly dimmer.
4.The bulb's brightness stays the same.
5.The bulb gets slightly brighter.
6.The bulb gets noticeably brighter.
7.A combination of 2 of the answers above; first one happens, then the other.
The magnetic field at point P due to a 2.0-A current flowing in a long, straight, thin wire is 8.0 ?T. How far is point P from the wire? (?0 = 4? × 10-7 T ? m/A)
A) 10 cm B) 2.0 cm C) 5.0 cm D) 2.5 cm E) 4.0 cm