Answer:
The objects were 1.8m apart.
Explanation:
We will start stating the Coulomb's Law. It says that:
Where F_e is the electric force between the objects, q_1 and q_2 are the magnitude of the charge of the objects, r is the distance between them and K is the Coulomb's constant (
in vacuum). Solving for the distance r we have:
Plugging the given values into this equation, we obtain:
In words, the two charged objects were 1.8m apart.
Answer:
The reactivity of metals increases as you move left in a period and as you move down in a group, so Marie needs to know the period and group of the element inside each box. Boxes that show locations in groups 1 or 2 or in period 8 contain the most reactive elements.
Explanation:
Answer:
when the water is heated with immersion heater, the water becomes less dense due to which the warm water rises up and the cooler water fills it's space.
The answer using the graphical method and analytical method of vector addition will always be
C. Same
Analytic method means adding vectors (x₁,y₁) and (x₂,y₂) give (x₁+x₂,y₁+y₂)
Example: Addition of (2,3) and (1,1) gives (3,4)
Solving it graphically will also give (3,4)
Answer:
At what time of day would you expect the New Moon to rise?
A) Midnight
B) Sunset
C) Noon
D) Sunrise
An HR diagram is a plot of:
A) Luminosity versus apparent magnitude.
B) Absolute magnitude versus luminosity.
C) Absolute magnitude versus surface temperature.
D)Apparent magnitude versus color index.
E) Color index versus surface temperature.
What is the most easily visible manifestation of the Earth's magnetic field?
A) The Van Allen radiation belts
B) The magnetopause
C) The aurorae
D) There is no easily visible manifestation of the Earth's magnetic field.
For a lunar eclipse (the moon is obscured from view), which phase is necessary?
A) third quarter
B) new moon
C) first quarter
D) full moon
