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levacccp [35]
4 years ago
5

Which rock is made mostly of dark, fine-grained silicate minerals, chiefly plagioclase feldspar and pyroxene, and magnetite?

Physics
1 answer:
Dafna1 [17]4 years ago
8 0

A dark-colored (igneous rock,) commonly extrusive from volcanic eruptions and composed primarily of the minerals of calcic plagioclase and pyroxene, and sometimes olivine. Basalt is the fine-grained equivalent of gabbro.

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A box (250 kg) sits inside the trailer of a semitruck traveling at a speed of 25 m/s (~ 55 mph). Suddenly, a car in front of the
shtirl [24]

Answer:

RIGHT

Explanation:

given,

mass of box = 250 kg  

speed of the truck = 25 m/s

static friction  µs = 0.7      

g = 10 m/s²                

to find direction of friction on the box    

truck is moving in left direction and suddenly in front of truck a car stops then the driver hit the brake hard so at that moment the box on the trailer will have the tendency to move left so to oppose its movement friction force will be on RIGHT

3 0
3 years ago
Provide at least one example of acceleration and explain why it would be considered a scalar or vector quantity.
Gelneren [198K]
Take gravity you are accelerated toward the ground.  Since gravity has both a direction and a magnitude, then it is a vector.
5 0
3 years ago
An object placed on an equal-arm balance requires 12 kg to balance it. when placed on a spring scale, the scale reads 12 kg. eve
Mkey [24]
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8 0
4 years ago
Charcoal appears black in color because it
steposvetlana [31]
C. This is the idea of "black body radiation". Charcoal/carbon is a "perfect black body". Absorbs all radiation. There's a whole host of stuff about this in physics, including, I think, Planck's (Nobel Prize winner) black body radiation theory.
4 0
3 years ago
Read 2 more answers
A galloping pony speeds past you at 5 m/s. The frequency of the sound produced by the hooves on the dirt is 221 Hz. Assume the s
kow [346]
Given:
speed of passing pony 5 m/s
frequency of the sound produced: 221 Hz
speed of sound 342 m/s

Let us use the Doppler Shift Formula:
Where the <span>source is moving away from the observer at rest
</span>
f' = (v / v+vs) f
Where, vs<span> = Velocity of the Source,</span>
           v = Velocity of sound or light in medium,
           f = Real frequency,
           f' = Apparent frequency.

f'= [342 m/s / (342 m/s+5m/s)] * 221 Hz
f' = 0.9856 * 221Hz
f' = 217.8176 Hz or 218 Hz

The observed frequency <span>of the hooves after the pony has passed your position is 218 Hz.</span>
7 0
3 years ago
Read 2 more answers
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