A plane has an eastward heading with an airspeed of 156 m/s. A 20.0 m/s wind is blowing southward at the same time as the plane is flying. The velocity of the plane relative to the ground is
A) 155 m/s at an angle 7.36° south of east.
B) 155 m/s at an angle 7.36° east of south.
C) 157 m/s at an angle 7.31° south of east.
D) 157 m/s at an angle 7.31° east of south.
E) 157 m/s at an angle 7.36° south of east.
C
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When we see x-rays from an accretion disk in a binary system, we can't immediately tell whether the accretion disk surrounds a neutron star or a black hole. Suppose we then observe each of the following phenomena in this system. Which one would rule out the possibility of a black hole?
A) intense x-ray bursts B) spectral lines from the companion star that alternately shift to shorter and longer wavelengths C) visible and ultraviolet light from the companion star D) bright x-ray emission that varies on a time scale of a few hours
A proton moving along the x axis has an initial velocity of 4.0 × 10^6 m/s and a constant acceleration of 6.0 × 10^12 m/s2 . What is the velocity of the proton after it has traveled a distance of 80 cm?
a. 5.1 × 10^6 m/s b. 6.3 × 10^6 m/s c. 4.8 × 10^6 m/s d. 3.9 × 10^6 m/s e. 2.9 × 10^6 m/s
A positively charged particle is moving in the +y-direction when it enters a region with a uniform electric field pointing in the +x-direction. Which of the diagrams below shows its path while it is in the region where the electric field exists. The region with the field is the region between the plates bounding each figure. The field lines always point to the right. The x-direction is to the right; the y-direction is up.
A.
B.
C.
D.
E.
A common depositional feature of shoreline topography is a
a. spit. b. guyot. c. seamount. d. sea arch.