Answer:
The resistance needs to be increased by a factor of 25 to quadruple the amount of heat generated
Explanation:
Let H be the heat generated by the stove element, V its voltage and R its resistance.
So, H ∝ V²/R
H = kV²/R
HR/V² = k
H₁R₁/V₁² = H₂R₂/V₂²
If H₂ = 4H₁ and V₂ = 10V₁
H₁R₁/V₁² = 4H₁R₂/(10V₁)²
H₁R₁/V₁² = 4H₁R₂/100V₁²
R₁ = R₂/25
R₂ = 25R₁
The resistance needs to be increased by a factor of 25 to quadruple the amount of heat generated.
Answer:
If you take the first example of the walk around the desk, it should be apparent that sometimes the distance is the same as the magnitude of the displacement. ... Since the displacement is measured along the shortest path between two points, its magnitude is always less than or equal to the distance.
An organism naturally adapts to it's environment. Organisms have to adapt to survive to live in a certain environment. Their outside appearance and physical features depends on how they get their food, how they protect themselves from predators, and how they keep their body warm or cold in that climate. This kind of goes with the idea of natural selection. Natural selection is when animals adapt to changes over time by reproducing and creating genetic variations in their offspring. For example, if there are two types of rabbits. One rabbit is black and the other is white. These rabbits live in a very cold place where there is a lot of snow. The predators have been eating most of the black rabbits since, they are easily seen. The white rabbits will keep on reproducing, while the black rabbits population will decrease. After a while the black rabbits will be no more and a new generation of white rabbits will be able to survive and thrive.
Answer:
E. existence of unpaired electrons in the outermost shell.
Explanation:
Answer:
I = 27kg.mi/h
Explanation:
In order to calculate the impulse of the ball, you use the following formula:
(1)
m: mass of the ball = 0.3kg
v: speed of the ball after the bat hit it = 60mi/h
vo: speed of the ball before the bat hit it = 30mi/h
You replace the values of all parameters in the equation (1):
where the minus sign of the initial velocity means that the motion of the ball is opposite to the final direction of such a motion.
The imulpse of the ball is 27 kg.miles/hour
