Two equal-magnitude forces are applied to a door at the doorknob. The first force is applied perpendicular to the door, and the second force is applied at 30° to the plane of the door. Which force exerts the greater torque about the door hinge?
A) the first force (applied perpendicular to the door)
B) the second force (applied at an angle)
C) Both forces exert equal non-zero torques.
D) Both forces exert zero torque.
A
You might also like to view...
Power: A series circuit has a 100-? resistor, 4.00-mH inductor and a 0.100-?F capacitor connected across a 120-V rms ac source at the resonance frequency. What is the power dissipated by the circuit?
A. 100 W B. 120 W C. 144 W D. 160 W E. 45.8 W
Satellite Motion: The innermost satellite of Jupiter orbits the planet with a radius of 422 × 103 km and a period of 1.77 days. What is the mass of Jupiter? (G = 6.67 × 10-11 N ? m2/kg2)
A. 1.33 × 1027 kg B. 1.50 × 1027 kg C. 1.72 × 1027 kg D. 1.89 × 1027 kg E. 3.08 × 1027 kg
Jupiter gives back into space twice the energy it gets from the distant Sun. Where is this energy coming from, for the most part?
A) the impact energy of comets like SL-9 B) helium rain descending into its mantle and core C) the slow escape of gravitational energy left from its formation D) the radioactive decay of U-238 in its iron-rich core, just as with the Earth E) the combined tidal stress of all four large Galilean moons
A helium nucleus (charge = 2e, mass = 6.63 × 10^-27 kg) traveling at 6.20 × 10^5 m/s enters an electric field, traveling from point A, at a potential of 1.50 × 10^3 V, to point B, at 4.00 × 10^3 V. What is its speed at point B?
1.7.91 × 10^5 m/s 2.3.78 × 10^5 m/s 3.2.13 × 10^5 m/s 4.2.52 × 10^6 m/s 5.3.01 × 10^8 m/s