Which instrument is used to measure heat radiation?

What is the newton's 1st, 2nd and 3rd Law?

What is linear diameter of an object that has an angular diameter of 22 arc seconds and a distance of 1400 m

A bullet of mass 11.1 g is fired into an initially stationary block and comes to rest in the block. The block, of mass 1.01 kg, is subject to no horizontal external forces during the collision with the bullet.

Why when you rub two objects together they produce

The 6.50-cm-long second hand on a watch rotates smoothly. What is its angular velocity? What is the speed of the tip of the hand?

Let's say you had a pulley system with a mechanical advantage of 3. If you want to lift a boulder 10 meters off the ground, how far would you have to pull the rope?

For glass fragments to be individualized, what must be true? A. They must fit together B. They must have the same density C. They must look the same D. They must be the same color

In what way would a digital thermometer be preferable to those from a liquid-based thermometer? Digital thermometer readings are easier to use when performing calculations.

Why does the core of the sun contain more helium and less hydrogen than the surface of the sun?

What happens to a light ray passing through the center of a lens?