A 4.00 kg mass is moving in a circular path of radius 3.20 m with a constant tangential velocity of 6.20 m/sec. The centripetal force on the mass is
A. 40.2 N.
B. 48.1 N.
C. 50.5 N.
D. 59.0 N.
E. 62.3 N.
B. 48.1 N.
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A mobile phone is pulled northward by a force of 10 N and at the same time pulled southward by another force of 15 N. The resultant force on the phone is
A) 0 N. B) 5 N. C) 25 N. D) 150 N.
A cyclotron with a magnetic field of 1.2 T is used to accelerate protons. How does the time for the protons to complete one orbit change when the radius of their orbit changes from 10 cm to 22 cm?
A. It increases by a factor of 2.2. B. It decreases by a factor of 2.2. C. It increases by a factor of 4.8. D. It decreases by a factor of 4.8. E. It stays the same.
Consider a large truck and a small car driving up a straight, steep hill. The truck is moving at 60 miles per hour and the car at 30 miles per hour. Assuming that the speeds are constant, which of the two vehicles experiences a larger net force?
A. the truck B. the same: zero net force C. the car
________ are small dark nebulae about 1 light-year in diameter that contain 10 to 1,000 solar masses
a. HI regions b. HII regions c. Emission nebulae d. Bok globules e. Reflection nebulae