Why must you never use the coarse adjustment knob to focus under high power?

Abanked road comer of radius 146 m is to be constructed. if the comer is designed for vehicles moving with a speed of 20.0 m/s, what should the banking angle be, in units of degrees?

Arrange the images in order to show how lake-effect snow occurs.

In addition to gravity, what is the other predominant force that affects the motion of a pendulum?