When a hydrogen electron is in its ground state, its principal quantum number is
a. zero.
b. –13.6 eV.
c. 1.
d. +13.6 eV.
e. none of these.
c
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A(n) _________is a device that allows the angle of a sample relative to a reference to be changed and measured.
Fill in the blank(s) with the appropriate word(s).
Can an object have increasing speed while its acceleration is decreasing? Support your answer with an example
A) No, this is impossible because of the way in which acceleration is defined. B) No, because if acceleration is decreasing the object will be slowing down. C) Yes, and an example would be an object falling in the absence of air friction. D) Yes, and an example would be an object rising in the absence of air friction. E) Yes, and an example would be an object released from rest in the presence of air friction.
An automobile manufacturer claims that its product will, starting from rest, travel 0.40 km in 9.0 s. What is the magnitude of the constant acceleration required to do this?
a. 9.9 m/s2 b. 8.9 m/s2 c. 6.6 m/s2 d. 5.6 m/s2 e. 4.6 m/s2
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.