True or false on the celsius temperature scale there are no negative numbers

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.

Avery long solenoid of inner radius 2.75 cm creates an oscillating magnetic field of the form = for this solenoid, =0.00425 t and =319 rad/s. (a)what is the maximum value of the induced electric field at a perpendicular distance 1.45 cm from the axis of the solenoid? (b) what is the maximum value of the inducted electric field at a point 5.85 cm perpendicular from the axis of the solenoid?

In a good thermo flask the main cause of heat loss is