Answer: Bonds between atoms break and new bonds form.
Explanation:
A chemical reaction takes place when bonds between atoms of the reactants break and new bonds form in the product.
An endothermic chemical reaction requires energy to break the bonds and an exothermic reaction releases energy.
Reactants go into a reaction and products come out.
Chemical reaction:
A + B ⇒ AB
where A and B are reactants and AB is the product. Atomic bonds of A and B break to form new bonds in the product AB
Answer:
Friction
Explanation:
As the toy cars rolls away, more friction is created. The more friction there is, the more friction on surface rubs against another which creates friction which in-term slows it down. Hope this helps.
Answer:
0.60 N, towards the centre of the circle
Explanation:
The tension in the string acts as centripetal force to keep the ball in uniform circular motion. So we can write:
(1)
where
T is the tension
m = 0.015 kg is the mass of the ball
is the angular speed
r = 0.50 m is the radius of the circle
We know that the period of the ball is T = 0.70 s, so we can find the angular speed:
And by substituting into (1), we find the tension in the string:
And in an uniform circular motion, the centripetal force always points towards the centre of the circle, so in this case the tension points towards the centre of the circle.
Explanation:
Answer:
It starts from rest so Vi=0
Vf=10 m/s
t=5 seconds
Explanation:
a=Vf-Vi/t
a=10-0/5
a=10/5
a=2m/s^s
Answer:
C. magnetic force
Explanation:
A magnetic field is responsible for the magnetic forces acting on a moving charge, so we can say that the direction of the magnetic field is determined by the magnetic forces. In the case of a conductor traversed by electric current and subjected to the presence of a magnetic field, we will also have the action of a magnetic force, since the current represents an orderly movement of electric charges.
An example of the application of magnetic force occurs in the TV tube, where a set of coils (artificial magnets), with their magnetic fields, enables the action of magnetic forces that deflect electron beams, causing them to traverse the entire screen. These electron beams sweep the phosphor-coated screen, line by line, from left to right and top to bottom, allowing the image to emerge.