If an object is located 20 m to the left of the origin at 1:00 PM, and later the object is located 30 m to the right of the origin at 2:00 PM, then the displacement from 1:00 PM to 2:00 PM is
A. 50 m to the right.
B. 30 m to the right.
C. 25 m to the right.
D. 20 m to the left.
E. 10 m to the left.
A. 50 m to the right.
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A large jetliner with a wingspan of 51.0 m flies horizontally and due north at a speed of 440 m/s in a region where the magnetic field of the earth is 48.4 µT directed 30.0° below the horizontal. What is the magnitude of the induced emf between the ends of the wing?
a. 9.41E–1 mV b. 1.09E+0 mV c. 5.43E–1 mV d. 3.26E+1 mV e. 1.06E–2 mV
A sphere of surface area 1.25 m2 and emissivity 1.0 is at a temperature of 100°C. At what rate does it radiate energy into empty space? (? = 5.67 × 10-8 W/m2 ? K4 )
A) 7.1 W B) 0.71 mW C) 1.4 kW D) 9.9 mW E) 3.7 W
Consider a situation where two moving objects collide and rebound from each other. The energy of a ball rolling up an inclined plane
a. is entirely kinetic b. is entirely potential c. is both kinetic and potential d. none of the above
What made most of the oxygen nuclei in the solar system?
A) stars B) Nothing makes elements–oxygen has always been present in the universe. C) the Big Bang D) our Sun E) high energy collisions of dust and cosmic rays