The first law of thermodynamics states that energy cannot be created or destroyed, but it can change from one form to another
Answer: waves
Explanation:
Rhythmic disturbances that carry energy without carrying matter are called waves
3.57m/s²
Explanation:
Mass of swimmer = 70kg
Force on the swimmer = 250N
Unknown:
Acceleration = ?
Solution:
Force is a function mass and acceleration of a body.
Newton's second law of motion "The force acting on a body is equal to the product of mass and acceleration".
Force = mass x acceleration
The unknown here is acceleration; then we make it the subject of the formula:
Acceleration =
= ![\frac{250}{70}](https://tex.z-dn.net/?f=%5Cfrac%7B250%7D%7B70%7D)
Acceleration = 3.57m/s²
learn more:
Acceleration brainly.com/question/3820012
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C. amphibian eggs do not contain a protective shell
The answer is c. +2.0 µC
To calculate this, we will use Coulomb's Law:
F = k*Q1*Q2/r²
where F is force, k is constant, Q is a charge, r is a distance between charges.
k = 9.0 × 10⁹ N*m/C²
It is given:
F = 7.2 N
d = 0.1 m = 10⁻¹ m
Q1 = -4.0 µC = 4 * 1.0 × 10⁻⁶ = 4.0 × 10⁻⁶
Q2 = ?
Thus, let's replace this in the formula for the force:
7.2 = 9.0 × 10⁹ * 4.0 × 10⁻⁶ * Q2/(10⁻¹)²
7.2 = 9 * 4 * 10⁹⁻⁶ * Q2/10⁻¹°²
7.2 = 36 × 10³ * Q2 / 10⁻²
Multiply both sides of the equation by 10⁻²:
7.2 × 10⁻² = 36 × 10³ * Q2
⇒ Q2 = 7.2 × 10⁻² / 36 × 10³ = 7.2/36 × 10⁻²⁻³ = 0.2 × 10⁻⁵ = 2 × 10⁻⁶
Since µC = 1.0 × 10^-6:
Q2 = 2 * 1.0 × 10^-6 = 2 µC