4. Charge may be measured in the
following units except
(a) Coulomb (b) atomic unit of charge (c)
farad (d) Electromagnetic unit of charge
5. Color depends on what characteristic
of light?
(a) its frequency (b) its wavelength (c)
both of these (d) neither of these
6. A concave mirror of radius of curvature
40 cm forms a real image twice as large
as the object. What is the object distance?
(a) 80 cm (b) 60 cm (c) 30 cm (d) 40 cm
7. The driving mirror of a car has a radius
of curvature of 1 m. A vehicle behind the
car is 4 m from the mirror. Find the image
distance behind the mirror.
(a) 7/8 (b) 4/9 (c) 4/7 (d) 9/2

A 0.25 kg baseball is in contact with a bat for 0.0075 s and exerts a force of 18,500 N. What impulse is delivered to the ball?

33 kg •

140 kg •

4600 kg •

74,000 kg •

Explanation:

the order for strong to weak forces such as

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

the fundamental forces are those forces that act between to objects or element to make interactions. there are four types of fundamental forces such as strong and weak nuclear forces (due to protons and electrons), electromagnetic force (due to the motion of electrons) and gravitational force (due to orbital movement of the planet). if these forces are arranged on the basis of their maximum strength then the order is

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force