A ventilation fan has blades 0.50 m long rotating at 20 rpm. What is the centripetal acceleration of a point on the outer tip of a blade?
a. 1.1 m/s2
c. 0.55 m/s2
b. 2.2 m/s2
d. 3.3 m/s2
B
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The change in electric potential energy, Ub - Ua, is the work done on a charge by the electric force as it moves from point a to point b
Indicate whether the statement is true or false
Two bodies with masses m1 and m2 are both moving east with velocities of magnitudes v1 and v2, where v1 is less than v2. The magnitude of the velocity of the center of mass of this system of two bodies is
A. less than v1. B. equal to v1. C. equal to the average of v1 and v2. D. greater than v1 and less than v2. E. greater than v2.
A jet engine develops 1.50 × 10^5 N of thrust in moving an airplane forward at a speed of 900 km/h. What is the power developed by the engine?
a. 1 350 kW b. 380 MW c. 37.5 MW d. 42.5 MW e. 32.5 MW
Two charged particles repel each other with a force F. If the charge of one of the particles is doubled and the distance between them is halved, then the force will be
A) F. B) 2 F. C) F/2. D) F/4. E) none of the above