Electric charges come in two forms: positive and negative. What combinations of charges will attract and repel each other?

The moon’s orbital speed around Earth is 3.680 × 10^3 km/h. Suppose the moon suffers a perfectly elastic collision with a comet

Naily [24]

Answer:

Speed of comet before collision is

$v_{2_{i}}=-2.5\times10^{3}\quad km/h$

Explanation:

Correction: (As stated after collision comet moves away from moon so velocity of moon and moon and comet must be opposite in direction. as spped of moon after collision is −4.40 × 10^2km/h so that comet's must be 5.740 × 10^3km/h instead of -5.740 × 10^3km/h)

Solution:

$mass \quad of\quad moon = m_{1}\\\\mass\quad of \quad comet = m_{2} = 0.5 m_{1}\\\\speed\quad of\quad moon\quad before\quad collision = v_{1_{i}}=3.680\times 10^3 km/h\\\\speed \quad of\quad moon\quad after\quad collision=v_{1_{f}} = -4.40 \times 10^2 km/h\\\\speed\quad of\quad comet\quad after\quad collision =v_{2_{f}} =5.740 \times 10^3 km/h$

Case is considered as partially inelastic collision, by conservation of momentum

$m_{1}v_{1_{i}}+m_{2}v_{2_{i}}=m_{1}v_{1_{f}}+m_{2}v_{2_{f}}\\\\m_{1}v_{1_{i}}+0.5m_{1}v_{2_{i}}=m_{1}v_{1_{f}}+0.5m_{1}v_{2_{f}}\\\\v_{1_{i}}+0.5v_{2_{i}}=v_{1_{f}}+0.5v_{2_{f}}\\\\v_{2_{i}}=2(v_{1_{f}}+0.5v_{2_{f}}-v_{1_{i}})\\\\v_{2_{i}}=2(-4.40 \times 10^2+0.5(5.740 \times 10^3)-3.680 \times 10^3 )\\\\v_{2_{i}}=-2.5\times10^{3}\quad km/h$

8 0

3 years ago

The current flow occurs due to the difference in _______.

Mice21 [21]

Answer:

The current flow occurs due to the difference in electrical potential

Explanation:

The difference in electrical potential between two point in electrical circuit causes charges to flow, usually from the region of higher potential to the region of lower potential. The flow of these charges is known as current.

Thus, the current flow occurs due to the difference in electrical potential. Electric potential means work done in moving a unit positive charge from infinity to a particular point in the field against the electrical resistance of that field.

5 0

4 years ago

Which is a way that biotechnology has Not helped society?

QveST [7]

Bacteria can be used to grow a lot of vaccines. new, stronger bacteria has evolved that are resistant to antibiotics. Diabetics have a steady supply of inexpensive insulin

4 0

3 years ago

Which best explains the relationship between parent rock and soil composition

Vaselesa [24]

Soil is the result of chemical or physical weathering of a parent rock .this is so since the soil is just tiny particle of the huge parent rock and hence it affects soil composition . if the parent rock was made of limestone then the soil composition will constitute calcite and aragonite mineral elements from the limestone parent rock.

8 0

3 years ago

How can a driver best prepare to enter sharp curves on a road way

yawa3891 [41]

Slow down significantly before the curve in the road

5 0

3 years ago