Objects which have contracted, but are of too little mass to establish thermonuclear reactions in their cores, are ________, which slowly continue to cool
Fill in the blank(s) with correct word
brown dwarfs
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Projectile Motion: A projectile is fired from ground level with an initial speed of 55.6 m/s at an angle of 41.2° above the horizontal. Neglect air resistance, take upward as the positive direction, and use g = 9.8 m/s2.(a) Determine the time necessary for the projectile to reach its maximum height.(b) Determine the maximum height reached by the projectile.(c) Determine the horizontal and vertical components of the velocity vector at the maximum height.(d) Determine the horizontal and vertical components of the acceleration vector at the maximum height.
What will be an ideal response?
Suppose that a ship is accelerating through space in such a way that the passengers are experiencing a constant force (resulting from the thrust of the ship) equivalent to the total weight of the ship and passengers on Earth. From the point of view of observers on Earth, how does the ship accelerate?
A) At first, it has a nearly constant acceleration of 9.8 m/s2. But as it approaches the speed of light, its acceleration gradually slows in such a way that it never stops accelerating, but it never reaches the speed of light either. B) It has a constant acceleration of 9.8 m/s2, therefore increasing its speed by 9.8 m/s with each passing second. C) At first, it has a large acceleration, much larger than 9.8 m/s2. But when it reaches the speed of light it stops accelerating. D) It has a constant acceleration of 9.8 m/s2 until it reaches a speed of half the speed of light. Then its acceleration suddenly slows so that it can't go much faster.
A ball is thrown against a wall, bounces off, and is caught. The number of impulses acting on the ball is
1) one. 2) two. 3) three. 4) none. The greatest impulse occurs when the ball 5) is thrown. 6) bounces against the wall. 7) is caught. 8) is zero for each. 9) is nonzero, but the same for each case.
A star can be a supernova
A) in predictable cycles of decades. B) a few times, at unpredictable intervals. C) only if it can fuse iron in its core. D) before it reaches the main sequence, if it is massive enough. E) only once.