Density can be defined as the measure of mass of a substance per unit volume.
Answer:
0.061 J
Explanation:
The kinetic energy of an object is given by

where
m is the mass of the object
v is its speed
For the toy truck in the problem, we have
m = 0.1 kg is its mass
v = 1.1 m/s is its speed
Putting the numbers into the equation, we find

Answer:

Explanation:
The electric force on a charged particle is given by

where
q is the charge of the particle
E is the strength of the electric field
In this problem, we have
is the electric field strength
is the charge of the calcium ion
Therefore, the electric force exerted on the calcium ion is

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