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

Identify the energy transformations that take place in an electrical fan heater

Given that the electric potential is 7.3*10-2 V higher outside the cell than inside the cell, and that the cell membrane is 0.10 μm thick, calculate the work that must be done (in joules) to move one sodium ion from inside the cell to outside.

Water is a major agent of chemical weathering because water

Astronomers discover an exoplanet (a planet of a star other than the sun that has an orbital period of 3.41 earth years in its circular orbit around its sun, which is a star with a measured mass of 3.13 * 1030 kg.

The waste from which type of power plant produces the least amount of greenhouse gases? a coal power plant a gas power plant a nuclear power plant an oil power plant

A fishbowl has a circular opening with a diameter of 13 cm. The fishbowl sits upright on a table in a magnetic field of 0.00110 T that is directed downward. What is the flux through the glass of the bowl? -1.5*10^-5 Wb -4.5*10^-4 Wb 0.0 Wb -5.

Why do cars need a cooling system in conjunction with the engine

A runner starts from rest and has an acceleration of 3 m/s2. How fast is she running after 1.1 seconds

Which best blocks X-ray particles and can therefore be observed more closely through the use of this technology?

A light ray travels inside a horizontal plate of glass, striking its upper surface at an angle of incidence of 50°. This ray is totally internally reflected at the glass-air boundary. A liquid is then poured on top of the glass.