1) what's the recommend amount of uv protection that sunglasses should provide?

a. 50%

b. 75%

c. 80%

d. 100%2) one way to ensure good sleep hygiene is to change your bedtime frequently. truefalse

A clock has a second hand whose tip rubs against the inside of the glass cover. If the frictional force between the glass cover and the tip of the second hand is 0.0020? and the length of the hand is 8.

What is true if mass is conserved in a reaction

How much work is done when a 1 newton force moves an object 1 meter?

Light that is polarized along the vertical direction is incident on a sheet of polarizing material. Only 92% of the intensity of the light passes through the sheet and strikes a second sheet of polarizing material.

A square loop of wire with sides 0.31 m long is placed with its plane perpendicular to a 5.9 T magnetic field. What is the magnetic flux through the loop, in units of Webers?

How do a joule a watt and a Newton relate to each other

Say you want to make a sling by swinging a mass M of 1.9 kg in a horizontal circle of radius 0.042 m, using a string of length 0.042 m. You wish the mass to have a kinetic energy of 15.0 Joules when released.

List three ways that electromagnetic radiation is used to improve our everyday lives.

Suppose an electron and a proton move at the same speed. which particle has a longer de broglie wavelength? suppose an electron and a proton move at the same speed.

The apparent displacement of an object as it is viewed from two different positions is known as A. parallax. B. a parsec. C. a light-year. D. an arcsecond.