I can't find this answer anywhere, so I'll ask here: what item did they base the SI unit of mass (grams) off of? (in other words, to what object did they say "hey, lets make this equal 1 gram and then go from there"

A firefighting crew uses a water cannon that shoots water at 25.0 m/s at a fixed angle of 53 degrees above the horizontal. The firefighters want to direct the water at a blaze that is 10.0 m above ground level.

A bobsled has a momentum of 1500 kg*m/s to the south. Air resistance reduces its momentum to 750 kg*m/s to the south. What impulse is applied to the bobsled by the air resistance?

An unfortunate astronaut loses his grip during a spacewalk and finds himself floating away from the space station, carrying only a rope and a bag of tools. first he tries to throw a rope to

Train car A is at rest when it is hit by train car B. The two cars, which have the same mass, are stuck together and move off after the collision.

Traveling in circle requires a net force

A frog in a hemispherical pod finds that he just floatswithout sinking in a fluid of density 1.25 g/cm3. If the pod has a radius of3.00 cm and negligible mass, what isthe mass of the frog?

What is the reasonable estimate for Lim g (x)

Do tides depend more on the strength of gravitational pull or on the difference in strengths? explain.

Which of the following scenarios would create the most friction between the two surfaces? A.) a shoe with a rubber sole moving against a smooth tile floor B.) a shoe with a wooden sole moving against a smooth tile floor C.

A ball is dropped from rest from the top of a building. what force is responsible for the downward motion of the ball?