How can scientists eliminate the chance of error in their investigations

Two identical metal rods are heated in a fire. The first rod glows red, the second rod glows yellow. Which one is colder?

An electric heating element is connected to a 110 V circuit and a current of 3.2 A is flowing through the element. How much energy is used up during a period of 5 hours by the element

List the different types of electromagnetic readiation (waves) in order from shortest wavelength to longest wavelength

What type of friction is using chalk in the summer to draw on the ground in Copley square? Sliding friction Rolling friction static friction Fluid friction

A method for determining the age of an object based on the concentration or a particular radioactive isotope contained within it is known as

Sound 1 has an intensity of 38 W/m2. Sound 2 has an intensity level that is 2.5 dB greater than the intensity level of sound 1. What is the intensity of sound 2?

A cannonball is launched horizontally off a 20 m high castle wall with a speed of 85 m/s. How long will the cannonball be in flight before striking the ground? What is the range of the cannonball?

It is well known that bullets fired at Superman simply bounce off his chest. Suppose that a gangster sprays Superman's chest with bullets of mass m = 1.7 g at a rate of R = 165 bullets/min. The speed of each bullet is v = 380 m/s.

If you are 3.00 m from speaker A directly to your right and 3.50 m from speaker B directly to your left, will the sound that you hear be louder than the sound you would hear if only one speaker were in use?

How much more ground motion is produced by an earthquake of magnitude 7.0 than by an earthquake of magnitude 4.0?