I really need this done please help me. What is the specific heat of a 400 g sample at 63°C if it is inserted into a calorimeter containing 750 mL of water (C = 4,186 J /kg°C) at 23°C, and eventually brought to an equilibrium of 47°C? Show all work and units for full credit.

Abug is 12 cm from the center of a turntable that is rotating with a frequency of 45 rev/min . what minimum coefficient friction is required so that the bug stays on the turntable?

How many molecules are present in 3 mols of silicon dioxide (sio2)?

After a big snowfall, you take your favorite rocket-powered sled out to a wide field. the field is 195 m across, and you know that your sled accelerates at a rate of 3.65 m/s2 when the rocket is on. how much time will it take the sled to cross the field starting from rest, assuming the rocket is on the whole time?