The pressure inside a commercial airliner is maintained at 1 ATM (1.01 × 10^5 N/m2). What is the outward force exerted on a 1.0 m × 2.0 m cabin door if the outside pressure (at 10 km height) is 0.3 ATM?
a. 1.4 × 10^2 N
b. 1.4 × 10^3 N
c. 1.4 × 10^4 N
d. 1.4 × 10^5 N
e. 7.0 × 10^3 N
d
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Three identical charges of 3.0 ?C are placed at the vertices of an equilateral triangle which measures 30 cm on a side. What is the magnitude of the electrostatic force which acts on any one of the charges?
A) 1.6 N B) 1.8 N C) 2.0 N D) 2.2 N E) 2.4 N
A straight wire of length l is oriented east-west and is in a magnetic field B pointing north. The wire is moving downward at a constant speed v. Which end of the rod is positively charged?
a. neither b. the east end c. the west end d. both ends
The quantity "pressure" expressed in terms of the fundamental quantities (mass, length, time) is equivalent to:
a. MLT-1. c. M2L-1T-3. b. ML-1T-2. d. a dimensionless quantity.
If the mass of an object does not change, a constant net force on the object produces constant
A) velocity. B) acceleration. C) both of these D) none of the above