Which officeholders are elected by the electoral college

Pyrite is called "fool's gold" because it's looks a lot like gold. Which properties can be used to tell gold and pyrite apart?

AlladinOne [14]

Density, streak, and geochemical signature through use of inductively coupled plasma mass spectrometry or Fourier transform infrared spectroscopy

7 0

3 years ago

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A 70kg skier moving at 5 m/sec down a slope what is the skier’s momentum

olga2289 [7]

Answer:

Momentum of the skier is 350 Kg.m/sec

Explanation:

Momentum of a body can be calculated using the following rule:

P = m * v

where:

P is the momentum of the body

m is the mass of the body given as 70 Kg

v is the velocity of the body given as 5 m/sec

Substitute with the givens in the above rule to get the momentum of the skier as follows:

P = m * v

P = 70 * 5

P = 350 Kg.m/sec

Hope this helps :)

4 0

3 years ago

Two 5.0 kilogram objects have different gravitational potential energies. What property of the objects must differ?

ipn [44]

Answer:

Height.

Explanation:

Potential energy can be defined as an energy possessed by an object or body due to its position.

Mathematically, potential energy is given by the formula;

$P.E = mgh$

Where,

P.E represents potential energy measured in Joules.

m represents the mass of an object.

g represents acceleration due to gravity measured in meters per seconds square.

h represents the height measured in meters.

Hence, the property of the object (having a mass of 5 kilograms) which must differ to have different gravitational potential energies is the height from which they are falling from.

The object having the higher height would have a greater gravitational potential energy than the lower object.

7 0

3 years ago

(a) Two 44 g ice cubes are dropped into 220 g of water in a thermally insulated container. If the water is initially at 24°C, an

True [87]

Answer:

A.) 16.45 degree

B.) 19.86 degree

Explanation:

The parameters given in the question are:

Mass of the ice = 2 × 44g = 88g

Mass of water = 220g

Water temperature T1 = 24 degrees

Initial ice temperature TC = - 19 degrees

The specific heat of water is 4186 J/kg·K. The specific heat of ice is 2220 J/kg·K. The latent heat of fusion is 333 kJ/kg.

When the ice were dropped into the water, the ice gain heat and the water loses heat to the ice.

From the conservative of energy

Heat gain by the ice = heat lost by the water.

That is,

ML + MC Øi = MC Øw

Where Ø = change in temperature

88 × 333 + 88 × 2220 ( T + 19 ) = 220 × 4186 ( 24 - T )

29304 + 195360(T + 19) = 920920(24 -T)

Open the bracket

29304 + 195360T + 3711840 = 22102080 - 920920T

3741144 + 195360T = 22102080 - 920920T

Collect the like terms

195360T + 920920T = 22102080 - 3741144

1116280T = 18360936

T = 18360936 / 1116280

T = 16.45 degree

(b) What is the final temperature if only one ice cube is used?

Using the same formula

ML + MCØ = MCØ

44 × 333 + 44 × 2220 ( T + 19 ) = 220 × 4186 ( 24 - T )

14652 + 97680(T + 19) = 920920(24 -T)

Open the bracket

14652 + 97680T + 1855920 = 22102080 - 920920T

1870572 + 97680T = 22102080 - 920920T

Collect the like terms

97680T + 920920T = 22102080 - 1870572

1018600T = 20231508

T = 20231508 / 1018600

T = 19.86 degree

7 0

3 years ago

How did Orion become a constellation?

kherson [118]

While the Orion constellation is named after the hunter in Greek mythology, it is anything but stealthy. Orion, which is located on the celestial equator , is one of the most prominent and recognizable constellations in the sky and can be seen throughout the world.

5 0

3 years ago