Is there any possibillity of marking a special device to measure the magnitude of friction directly?

Which devices is used for measuring the mass of atoms/

Which among the following is not a device to measure mass ?

Voltmeter is a device used to measure electric current.

A calorimeter is a device used to measure the________.

Thermostat is a device can measure the heat capacity of the liquid in the container.

The magnitude of static frictional force f_s lies between

Answer the following as true or false. (i) A zero vector cannot be assigned a definite direction. (ii) A zero vector may be regarded as having any direction. (iii) Two vectors are equal if they have same magnitude and direction regardless of the position of their initial points. (iv) The length of a unit vector is 2.

Give an example of a device used to find the accurate measurement of weight.

Mention any two measures to control noise pollution.