21. light changes its direction when travelling through a new medium because denser mediums have a higher angle of refraction.
The dimensions of the completed ISS research facility will be approximately 356 feet (109 meters) by 240 feet (73 meters), or slightly larger than a football field. the ISS weighes around 450 tons (408,000 kg), or 450 times the weight of an average car.
Answer:
a)2.59 ×10⁵ N/C
Direction is to the right.
b) 4.14 × 10⁻¹⁴ N , direction is to the Left.
Explanation:
Given:
Charge =
Charge =
Distance from the negative charge = 0.05 m
Distance to = 0.032 m
a) Electric field = E =
k = Coulomb's constant = 9 × 10⁹ N m²/C²
E = = (1.40625 × 10⁴ + 24.48 × 10⁴ ]
= 2.59 ×10⁵ N/C
Direction is to the right.
b) Force on the electron = Charge on the electron × Electric field E.
⇒ F = ( 1.6 × 10⁻19)(2.59 ×10⁵) = 4.14 × 10⁻¹⁴ N , direction is to the Left.
Answer:
the cost to leave the lights on 24 hours a day for one year is 31,536 cents or 315.36 dollars
Explanation:
Given that;
P = 300 watts = 300/1000 = 0.3
t = 24hrs a day
In a calendar year, we have 365 days
so;
E = 0.3 × 365 × 24
E = 2628 KWh
given that; 1 KWh = 12 cent
then 2628 KWh is x
x = 2628 × 12
x = 31,536 cents or 315.36 dollars
Therefore, the cost to leave the lights on 24 hours a day for one year is 31,536 cents or 315.36 dollars