Answer:
J
Explanation:
The complete statement is given as
What is the maximum kinetic energy of electrons ejected from barium (Wo = 2.48 eV) when illuminated by white light, 400 nm to 750 nm ?
= wavelength of the white light = 400 nm = 400 x 10⁻⁹ m
= speed of white light = 3 x 10⁸ ms⁻¹
Energy of the white light is given as
= Work function of barium = 2.48 eV = 2.48 x 1.6 x 10⁻¹⁹ J
= Maximum kinetic energy
Using photoelectric equation we have
2.04 meters distance is traveled by the sled before stopping.
Mass of the sled = m
The initial speed of the sled = 2 m/s
Coefficient of kinetic friction between sled and ice = 0.100
Let the distance the sled moves before it stops be d.
Gravity = 9.8 m/ s²
Let the initial kinetic energy sled be
The work done by the frictional force is,
Work done by frictional force= Initial kinetic energy of the sled
So, the distance traveled by the sled before stopping is
Therefore, the distance traveled by the sled before stopping is 2.04 meters.
To know more about work done, refer to the below link:
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Answer:
The distance traveled during its acceleration, d = 214.38 m
Explanation:
Given,
The object's acceleration, a = -6.8 m/s²
The initial speed of the object, u = 54 m/s
The final speed of the object, v = 0
The acceleration of the object is given by the formula,
a = (v - u) / t m/s²
∴ t = (v - u) / a
= (0 - 54) / (-6.8)
= 7.94 s
The average velocity of the object,
V = (54 + 0)/2
= 27 m/s
The displacement of the object,
d = V x t meter
= 27 x 7.94
= 214.38 m
Hence, the distance the object traveled during that acceleration is, a = 214.38 m
Answer:
B. where tectonic plates meet
Explanation:
Most volcanoes occur near tectonic plate boundaries. For example, a large amount are found on the Ring of Firez connecting several plates.
