Answer:
The force of friction opposes the motion of an object, causing moving objects to lose energy and slow down. When objects move through a fluid, such as air or water, the fluid exerts a frictional force on the moving object. The frictional force from a fluid is called a drag force.
Explanation:
In a force diagram set-up, we name the angle of inclination theta, g as the acceleration due to gravity. In this case, the forces acting on the box going down is the weight itself impeded by the friction between the box and the inclined plane.
The weight of the box is expressed as mg sin theta
The frictional force is expressed as the normal force times the coefficient of friction that is expressed as mu g cos theta.
By Newton's second law of motion, F = ma = mg sin theta - mu g cos theta
Thus, a = g (sin theta - u cos theta
(a) The required magnitude of the electric field when the point charge is an electron is 5.57 x 10⁻¹¹ N/C.
(b) The required magnitude of the electric field when the point charge is an proton is 1.02 x 10⁻⁷ N/C.
<h3>
Magnitude of electric field </h3>
The magnitude of electric field is given by the following equation.
F = qE
But F = mg
mg = qE
E = mg/q
where;
- E is the electric field
- m is mass of the particle
- g is acceleration due to gravity
- q is charge of the particle
<h3>For an electron</h3>
E = (9.11 x 10⁻³¹ x 9.8)/(1.602 x 10⁻¹⁹)
E = 5.57 x 10⁻¹¹ N/C
<h3>For proton</h3>
E = (1.67 x 10⁻²⁷ x 9.8)/(1.602 x 10⁻¹⁹)
E = 1.02 x 10⁻⁷ N/C
Thus, the required vertical electric field is greater when the charge is proton.
Learn more about electric field here: brainly.com/question/14372859
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The mass has changed because a gas has formed and left the mixture.
Answer: Option A
<u>Explanation:
</u>
According to law of conservation of masses which is followed by every chemical reaction, the sum of masses of the reactants equal to the sum of the masses of the products. But in this case of baking soda of 10 g reacting with 100 g of vinegar is giving a resulting mixture of 105 g.
So, this mismatch in the resultant mass of the product with the sum of masses of the reactants is due to the formation of bubbles in the chemical reaction between baking soda and vinegar. This gas bubbles formed on reaction of vinegar with baking soda will leave the mixture.
As we known from conservation of mass, the resultant mixture should be equal to the sum of mass of vinegar and baking soda reacted which would have been equal to 110 g ( baking soda 10 g +100 g of vinegar). But we have obtained only 105 g of resultant mixture so the remaining 5 g has been converted into gas and left the mixture.
