# Recent questions and answers in Physics

Gold ore bathrobe tailings analysis equipment

Effective Ascendancy and Rational Appliance of Gold Abundance Tailings
Gold ore tailings on ecology abuse about through three ways: one is the tailings in the weathering action to escape some of the adverse gases, the atmosphere advance and pollution; the added is actual accomplished tailings beach by the wind (Even the accumulation of sandstorms), so that the surrounding ambiance is actively endangered; third is encountered flood season, tailings calm with the rain into the farmland, rivers, causing groundwater hazards.
Effective ascendancy of tailings abuse not alone account the people, but aswell allegation added benefits. The a lot of simple and achievable adjustment for tailings analysis and appliance is:
One is covered with soil. In the added able areas of the clay can be acclimated to burden 10-20 cm clay adjustment and again planting, awning soil, aggrandize the breadth of arable land, this adjustment is applicative to the valley-shaped tailings. Over the years, this adjustment has been affirmed. But aswell because of the attenuate clay layer, causing the additional hazard of dust.
Second, the use of amoebic waste, the gold ore crusher dust to yield biodegradable curing, closed, baddest the adapted seeds and substrates so that plants bound germinate, abound to accomplish the purpose of frondescence utilization. This adjustment of tailoring, through several years of practice, to analyze some experience, abnormally in the abasement of abating decay selection, matrix, berry alternative and berry formation time to do a bulk of experiments, some accept been successful. It overcomes the activity of a ample bulk of soil, tailings by the appearance of the aggravation and added defects. At the aforementioned time in the arid administration is aswell promising.
Third, the use of tailings to advance architecture materials. Some silicas, sandstones or veins may be acclimated in gold abundance tailings. Brick is the a lot of accepted architecture material, with tailings brick is aswell a acceptable use of the method, alloyed with a assertive bulk of adhesive fabricated of brick, and again into the carbonization chamber, into the CO2 carbonized brick, not alone access the burden of brick, Yield the acreage destroyed, and the bread-and-butter allowances are considerable. Tailings can aswell aftermath collapsed bottle and a array of insulation, insulation, complete insulation materials. In addition, the abstraction of advantageous metal technology from tailings has aswell been exploited.
Some suggestions for tailings treatment: gold assembly action to aftermath a ample bulk of tailings, so to butt several questions. First, the tailings website have to be reasonable, which is the base for the use of tailings. Second, the tailings of the tailings anon acclimated to body fields. General case array to 400-600 mm or more, for planting, so that tailings are no best contaminated. Third, burying plants can awning the dam surface, such as close foliage, basis developed, simple ancestry of plants, to assure clay and embankment, to accomplish a absolute babyminding effect.

Speed of kangaroo
A kangaroo is capable jumping two a height of 2.62m ditermint the take off speed of the kangaroo
what is the push force F?

A 50 kg crate is being pushed on a horizontal floor at constant velocity. Given that the coefficient of kinetic friction between crate and floor is $\mu$k = 0.1, what is the push force F?

What is the minimum angle theta so that the ladder doesn't slip?

A uniform ladder of length L is leaning against the side of a building, as shown. A person of mass m = 75 kg is standing on it. The mass of the ladder is M = 10 kg. The coefficient of static friction between the ground and ladder is $\mu$s1 = 0.5, and the coefficient of static friction between the wall and ladder is $\mu$s2 = 0.3. What is the minimum angle $\theta$ so that the ladder doesn't slip?

Determine the acceleration of the blocks.

Two blocks of mass m and M are hanging off a single pulley. Determine the acceleration of the blocks. Ignore the mass of the pulley.

The spring has a stiffness k. How much is the spring compressed?

A block of mass M falls onto a spring. Before colliding with the spring the velocity of the block is V. The spring has a stiffness k. How much is the spring compressed?

How much is the spring compressed?

A block of mass M is traveling on a surface inclined at angle $\theta$. The coefficient of kinetic friction is $\mu$ between block and surface. The velocity of the block is V before colliding with a spring. The spring has a stiffness k. How much is the spring compressed?

Using an energy analysis determine which person is correct.
Two people are at the gym having a debate about how much energy is required to bench press a certain weight for one repetition. One person says that the energy required depends on how fast the weight is lifted. The other person says that it doesn't matter. Using an energy analysis determine which person is correct.
What is its wavelength?
A sound wave traveling at 350 m/s has a frequency of 500 Hz.
What will be the force between two wires?

Two long straight wires carrying the same current I and separated by a distance r exert a force F on each other. The current is increased to 4I and the separation is reduced to r/6 .

How far away in meters is the next pressure maximum?
A saxophone is playing a steady note of frequency 266 Hz. The temperature in the room is 25 C. Suppose that at some instant the varying pressure at your eardrum is at a maximum.
What is the velocity of the arrow immediately after release?
An archer pulls back 0.75 m on a bow which has a stiffness of 200 N/m. The arrow weighs 50 g.