Color is the least useful property for identification, as the same mineral type can be found in several different colors due to impurities in the mineral.
Answer:
Explanation:
It is a problem based on simple harmonic motion and friction . maximum friction possible between large block and mass m is µ mg . During SHM , maximum acceleration is ω² A and force is mω² A .
friction must exceed it so that mass m may not slip over it during motion . so
µ mg ≥ mω² A
µ ≥ mω² A / mg
smallest value of µ
= mω² A / mg
= ω² A /g
Work=force X distance
Newtons is a measurement of force
4 meters is your distance 60×4=240
240 joules
Let x = the angle of elevation for shooting the arrow.
Assume
g = 9.8 m/s²
No wind resistance
The vertical launch velocity is 25.1 sin(x) m/s
The horizontal velocity is 25.1 cos(x) m/s
The time of flight is
24/[25.1 cos(x)] s = 0.9562 sec(x) s
Therefore
0.5*[0.9562 sec(x)]*(9.8) = 25.1 sin(x)
4.6854 = 25.1* sin(x)cos(x)
sin(2x) = 0.3733
2x = sin⁻¹ 0.3733 = 21.92 deg
x = 10.96 deg
Answer: 11 degrees (nearest integer)
