A projectile is projected from the origin with a velocity of 15.0 m/s at an angle of 30.0 degrees above the horizontal. What is the velocity of the projectile 2.00 seconds later?
A. 17.8 m/s at an angle of 38 degrees above the horizontal
B. 11.4 m/s at an angle of 43 degrees below the horizontal
C. 17.8 m/s at an angle of 43 degrees below the horizontal
D. 11.4 m/s at an angle of 38 degrees below the horizontal
E. 17.8 m/s at an angle of 43 degrees above the horizontal
C. 17.8 m/s at an angle of 43 degrees below the horizontal
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Which of the following materials is most appropriate for a design of the magnetoresistance random access memory for a computer?
(a) Layers of Fe and Ni (b) Layers of Fe and Cr (c) Layers of Fe3O4 and MnO (d) Fe-3 wt. % Si
What is the approximate age of the star cluster in the HR diagram below? (Hint: Main Sequence Stars of spectral between types A and B core supply of hydrogen is sufficient to last about 250 million years. Between A and F about 2 billion years.Type G about 10 billion years. Between K and M about 30 billion years..)
a.
200 million years
b.
2 billion years
c.
10 billion years
d.
30 billion years
e.
The age of the cluster can not be estimated from an HR diagram of the cluster.
A hollow spherical planet is inhabited by people who live inside it, where the gravitational field is zero. When a very massive spaceship lands on the planet's surface, inhabitants find that the gravitational field inside the planet is
A) still zero. B) non-zero, directed toward the spaceship. C) non-zero, directed away from the spaceship.
Pioneer 10 was able to escape the solar system by
A) having a sufficient escape velocity at launch. B) "bouncing off" Jupiter like a tennis ball bouncing off an approaching tennis racket. C) refueling via solar cells. D) nuclear-powered sustained thrust.