Seven
<em><u>Formula</u></em>
I'm assuming that the formula used is
R = R_ref [1 + α*(T - T_ref)=
<em><u>Givens</u></em>
- R_ref is the starting resistance of 100 ohms
- α (alpha) = 4.0 *10^-4 or 0.00040
- T_ref = 11.5 degrees Celcius
- T = 10 degrees.
- R=??
<em><u>Solution</u></em>
R = 100[ 1 + 4.0*10^4(10 - 11.5)] Collapse the brackets.
R = 100[ 1 + 4.0*10^4(-1.5)] Simplify
R = 100[1 - 0.00060] Subtract
R = 100[0.9994] Multiply
R = 99.94
Answer: A
Eight
The accepted formula for resistance and resistivity is
R = ρ * A / L where
rho is the resistivity
A is the face Area of the conductor
L is the length of the conductor.
Now a perfect conductor has a resistance of 0.
So since resistivity is a direct variation with resistance, its value also has to be 0.
Answer: A
Nine
The formula you need for this is W = I^2* R
W = 14 Watts
R = 17 ohms
I = ??
14 = I^2 * 17 Divide bother sides by 17
14/17 = I^2
0.8235 = I^2 Switch and take the square root of both sides.
I = sqrt(0.8234)
I = 0.9075 Answer: D
Answer:
E = F/q
Explanation:
Electric Field (E) : Electric Field (E) of an electrostatic field is defined as the force (F), per unit test charge (q) which it exert at that point. Its direction is that of the force exerted on a positive charge. The S.I unit of Electric field is Newtons per coulombs. (N/C).
Electric Field (E) can be expressed mathematically as,
E = F/q
Where F = Electrostatic force (Newton), q = charge (coulombs), E = Electric field.
Answer:
at the Equator
Explanation:
The four seasons are determined by four main positions in the Earth's orbit in its turn around the Sun (ecliptic plane), which are called solstices and equinoxes: winter solstice (Capricorn point, December 22), spring equinox (Aries point, around March 21-22), summer solstice (Cancer point, June 21) and autumn equinox (Libra point, around September 22-23).
In the equinoxes, the axis of rotation of the Earth is perpendicular to the sun's rays, which fall vertically over the equator. In solstices, the axis is inclined 23.5º, so that the sun's rays fall vertically on the Tropic of Cancer (summer in the northern hemisphere) or Capricorn (summer in the southern hemisphere).
When falling vertically on Ecuador, it generates a greater impact on the surface of the Tierre reaching a greater amount of energy and therefore UV rays.
Answer:
Inertia relates directly to an object's <em>mass</em>. It is its inherent property and expresses how much force is needed to bring the object to a certain level of acceleration. It is the sole factor.
Momentum relates proportionally to two factors: <em>mass</em> and <em>velocity</em>. As such, momentum is not an inherent property of an object but a measure dependent on it current velocity, in addition to its mass.