A scientist designs an experiment in which a light source is pointed at a substance and a light detector is placed on the opposi
te side of the substance.
When the light source is turned on, the scientist observes that no light is detected on the far side of the substance. What is the best interpretation for this observation?
A. The light was either reflected or transmitted by the substance.
B. The light was both absorbed and reflected by the substance.
C. The light was both reflected and transmitted by the substance.
D. The light was either absorbed or reflected by the substance.
When the light source is turned on, the scientist observes that no light is detected on the far side of the substance. What is the best interpretation for this observation?
A. The light was either reflected or transmitted by the substance.
B. The light was both absorbed and reflected by the substance.
C. The light was both reflected and transmitted by the substance.
D. The light was either absorbed or reflected by the substance.
2 answers:
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The speed of the rock at 20 m is 34.3 m/s
Explanation:
We can solve this problem by using the law of conservation of energy: the mechanical energy of the rock, sum of its potential energy + its kinetic energy) must be conserved in absence of air resistance. So we can write:
where :
is the initial potential energy
is the initial kinetic energy
is the final potential energy
is the final kinetic energy
The equation can also be rewritten as follows:
where:
m = 100 kg is the mass of the rock
is the acceleration of gravity
is the initial height
u = 0 is the initial speed (the rock starts at rest)
is the final height of the rock
v is the final speed when h = 20 m
And solving for v, we find:
Learn more about kinetic energy and potential energy here:
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Answer:
The International Space Station move at 7.22 km/s.
Explanation:
Orbital speed of satellite is given by , where G is gravitational constant, M is mass of Earth and r is the distance to satellite from centre of Earth.
r = R + h = 6350 + 1400 = 7750 km = 7.75 x 10⁶ m
G = 6.673 x 10⁻¹¹ Nm²/kg²
M = 5.98 x 10²⁴ kg
Substituting
The International Space Station move at 7.22 km/s.