The meaning of empirical formula

A car starts from rest at a stop sign. It accelerates at 4.0 m/s2 for 3 seconds, coasts for 2 s, and then slows down at a rate of 3.0 m/s2 for the next stop sign. How far apart are the stop signs?

You should wear these type of gloves to protect yourself from electrical sparks. True or False

Disks A and B are identical and roll across a floor with equal speeds. Then disk A rolls up an incline, reaching a maximum height h, and disk B moves up an incline that is identical except that it is frictionless.

An evacuated long tube contains a coin and a feather. If both objects fall together starting from the top of the tube, it is expected that:

Electrons (each with charge qe = 1.602 x 10-19) are ejected from a hot filament at a rate of 1.9 x 1013 electrons/second and then they are accelerated through an electric potential difference of 1000 V.

What is the frequency of a wave with a velocity of 21.2 m/s and a wavelength of 8.3m?

Positive ions have blank protons than electrons

What is the weight, in n, of an object with a mass of 200 kg at a location where g = 9.6 m/s2. round the final answer to the nearest whole number?

A 1.7 kg book is lying on a 0.77 m - high table. You pick it up and place it on a bookshelf 2.0 m above the floor. how much work does gravity do on the book?

What is the difference between diffusion and osmosis?