Need help with 7 questions I'll give 26 points for the best answer!!

Physics

2 answers:

GaryK [48]3 years ago

6 0

Room temperature

Oxygen

pychu [463]3 years ago

4 0

Answer:

Very cold temperatures
Chromium
Oxygen
Room temperature water
Distillation
Newton
The same

Explanation:

Superconductors perform best at very cold temperatures because resistivity of this kind of materials decays drastically with temperature.
Chromium is most likely to be the best conductor of electricity because it belongs to the Transition Metal group of the periodic table.
Oxygen is likely to be the best electrical insulator because it belongs to the Non Metal group, and is mostly found in gas state.
Water has lower viscosity than any oil at any temperature.
Distillation is a separation procedure that uses the difference of boiling points of two mixed liquids, evaporating one of them by heating the mix at an intermediate temperature, right between both boiling points.
Since weight is a force it must be measured in newtons.
Mass is the measurement of the amount of particles in a body. Since moving a body doesn't change its amount of particles, then the mass will be the same here and there.

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Determine W (or fuel energy) required to launch a satellite of mass m at rest from a launching pad placed at the surface earth,

jeka57 [31]

Answer:

5. 9GmM/(10R)

Explanation:

m is the mass of the satellite

M is the mass of the earth

W is the energy required to launch the satellite

Energy at earth surface = Potential energy (PE) + W

W = Energy at earth surface - Potential energy (PE)

But PE = $-\frac{GMm}{R}$

Therefore: W = Energy at earth surface - $\frac{GMm}{R}$

Energy at earth surface (E) at an altitude of 5R = $-\frac{GMm}{5r} +\frac{1}{2}mV^2$

But $V=\sqrt{\frac{GM}{5R} }$

Therefore: $E=-\frac{GMm}{5R}+\frac{1}{2}m(\sqrt{\frac{GM}{5R} } )^2= -\frac{GMm}{5R}+\frac{GMm}{10R} = -\frac{GMm}{10R}$

W = E - PE

$W=-\frac{GMm}{10R}-(-\frac{GMm}{R})=-\frac{GMm}{10R}+\frac{GMm}{R}=\frac{9GMm}{10R} \\W=\frac{9GMm}{10R}$

7 0

3 years ago

What is the momentum of a 50-kilogram ice skater gliding across the ice at a speed of 5 m/s? (1 point)

serious [3.7K]

Momentum is a term used to quantify the motion of an object has. It is calculated as the the product of the object's mass and the velocity. It is expressed as:

Momentum = m x v
Momentum = 50 kg x 5 m/s
Momentum = 250 kg m/s

Therefore, the correct answer is the last option.

3 0

3 years ago

Read 2 more answers

A water balloon is hovering directly above the line join points ANB which are 4.6 km apart if the angles of elevation to the bal

Anna35 [415]

Answer:

Drawing the triangle:

H / x = tan 52.2 = 1.29

H / (4.6 - x) = tan 28.8 = .550

H = 1.29 x

H = .55 * 4.6 - .55 x

1.84 x = 2.53 combining equations