An airplane with an airspeed of 140 km/h has a heading of 50° west of north in a wind that is blowing toward the east at 25 km/h. What is the groundspeed of the plane?
What will be an ideal response?
120 km/h
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Rotational Kinetic Energy: Suppose a solid uniform sphere of mass M and radius R rolls without slipping down an inclined plane starting from rest. The angular velocity of the sphere at the bottom of the incline depends on
A. the mass of the sphere. B. the radius of the sphere. C. both the mass and the radius of the sphere. D. neither the mass nor the radius of the sphere.
After light from a source passes through two slits, a first-order bright spot is seen on the wall at point P. Which distance is equal to the wavelength of the light?
a.
the extra distance one beam must travel
b.
the distance between beams as they leave the slit
c.
the distance of point P from the central point of the interference pattern
d.
the distance between slits
Newton's 1st Law of Motion states that
A) action and reaction are equal and opposite B) force equals mass times acceleration C) an object moves at a constant velocity unless a force acts D) the force of gravity decreases with increasing distance
Which of the following best explains why we can rule out the idea that planets are usually formed by near-collisions between stars?
A) Studies of the trajectories of nearby stars relative to the Sun show that the Sun is not in danger of a near-collision with any of them. B) Stellar near-collisions are far too rare to explain all the planets now known to orbit nearby stars. C) A near collision might have created planets, but it could not have created moons, asteroids, or comets. D) A near collision should have left a trail of gas extending out behind the Sun, and we see no evidence of such a trail.