Answer:
Light waves slow down as they travel from gas to solid.
Explanation:
The speed of light is often quoted with reference to a vacuum. Light travels fastest in a vacuum and in a gas.
When light travels through other media such as solids or liquids, the speed of light is decreased due to absorption and scattering of photons by molecules as well as remissions.
Hence the speed of light decreases from gas to solid.
Answer: Asteroids, meteoroids, and comets are remnants of the early solar system. This Statement is TRUE.
Explanation:
METEOROID: these are small rocky or metallic objects found in outer space.
ASTEROIDS: these are also known as minor planets of the inner solar system. They are irregularly shaped object in space that orbits the Sun.
COMETS: these are dusty chunk of ice, that moves in a highly elliptical orbit about the sun.
Asteroids, meteoroids, and comets as remnants of the early solar system was further proved in nebular hypothesis
initially proposed in the eighteenth century by German philosopher Immanuel Kant and French mathematician Pierre-Simon Laplace. (The word nebula means a gaseous cloud.) According to the modern version of the theory, about 4.5 to 5 billion years ago the solar system developed out of a huge cloud of gases and dust floating through space. These materials were at first very thin and highly dispersed.
Really, Gundy ? ! ?
The formula for the car's speed is given and discussed in the box. The formula is
v = √(2·g·μ·d)
Then they <em>tell</em> you that μ is 0.750 , and then they <em>tell</em> you that d = 52.9 m . Also, everybody knows that 'g' is gravity = 9.8 m/s² .
They also tell us that the mass of the car is 1,000 kg, and they tell us that it took 3.8 seconds to skid to a stop. But we already <em>have</em> all the numbers in the formula <em>without</em> knowing the car's mass or how long it took to stop. The police don't need to weigh the car, and nobody was there to measure how long the car took to stop. All they need is the length of the skid mark, which they can measure, and they'll know how fast the guy was going when he hit the brakes !
Now, can you take the numbers and plug them into the formula ? ! ?
v = √(2·g·μ·d)
v = √( 2 · 9.8 m/s² · 0.75 · 52.9 m)
v = √( 777.63 m²/s²)
v = 27.886 m/s
Rounded to 3 digits, that's <em>27.9 m/s </em>.
That's about 62.4 mile/hour .
5Newtons or 5N
Ten newtons minus five Newton’s is 5 Newton’s
Answer:
a) 0.41 m/s
b) 0.51 m/s
Explanation:
(a)
M = total mass of wagon, rider and the rock = 93.1 kg
V = initial velocity of wagon = 0.456 m/s
m = mass of the rock = 0.292 kg
v = velocity of rock after throw = 15.4 m/s
V' = velocity of wagon after rock is thrown
Using conservation of momentum
M V = m v + (M - m) V'
(93.1) (0.456) = (0.292) (15.4) + (93.1 - 0.292) V'
V' = 0.41 m/s
b)
M = total mass of wagon, rider and the rock = 93.1 kg
V = initial velocity of wagon = 0.456 m/s
m = mass of the rock = 0.292 kg
v = velocity of rock after throw = - 15.4 m/s
V' = velocity of wagon after rock is thrown
Using conservation of momentum
M V = m v + (M - m) V'
(93.1) (0.456) = (0.292) (- 15.4) + (93.1 - 0.292) V'
V' = 0.51 m/s
