A particle P is moving in a horizontal circle about O. It moves at constant speed V. Р
Which statement is true?
A
B
A force of constant size is acting in the direction of V.
A force of constant size is acting towards O.
The force on P varies in size as it moves around the circle.
С
D
There are no forces acting on P.

Clothes dryer uses about 7 amps of current from a 240 volt line. how much power does it use?

What is the role of lenses in microscopy?

Uranium has two naturally occurring isotopes. 238u has a natural abundance of 99.3% and 235u has an abundance of 0.7%. it is the rarer 235u that is needed for nuclear reactors. the isotopes are separated by forming uranium hexafluoride uf6, which is a gas, then allowing it to diffuse through a series of porous membranes. 235uf6 has a slightly larger rms speed than 238uf6 and diffuses slightly faster. many repetitions of this procedure gradually separate the two isotopes. what is the ratio of the rms speed of 235uf6 to that of 238uf6? express your answer to five significant figures.