Is anyone here? I need help if you are there!?! You are planning an investigation that explores the properties of matter. Which of the following will help you discover a physical property?

Experiment: place a powder into a beaker that contains a liquid/Result: the beaker gets hotter

Experiment: place a powder into a beaker that contains a liquid/Result: the solid dissolves into the liquid

Experiment: place a powder into a beaker that contains a liquid/Result: the mixture begins to fizz and bubble

Experiment: place a powder into a beaker that contains a liquid/Result: the mixture catches fire and burns down the lab

Aparticle travels in a circular orbit of radius 21 m. its speed is changing at a rate of 23.1 m/s2 at an instant when its speed is 37.2 m/s. what is the magnitude of the acceleration (in m/s? ) of the particle?

What is the momentum of a 2 kg object moving at 15 meters per second

The ultracentrifuge is an important tool for separating and analyzing proteins. because of the enormous centripetal accelerations, the centrifuge must be carefully balanced, with each sample matched by a sample of identical mass on the opposite side. any difference in the masses of opposing samples creates a net force on the shaft of the rotor, potentially leading to a catastrophic failure of the apparatus. suppose a scientist makes a slight error in sample preparation and one sample has a mass 10 mg larger than the opposing sample. if the samples are 12 cm from the axis of the rotor and the ultracentrifuge spins at 70,000 rpm, what is the magnitude of the net force on the rotor due to the unbalanced samples? ( be thorough on your answer)