An ice cube with a temperature of -30°C and a mass of 45g is dropped into a thermos of liquid water with a temperature of 50°C. The ice cube eventually melts completely and the mixture reaches an equilibrium temperature of 12°C. Assuming no heat is lost to the environment, what was the mass of the water in the thermos before the ice cube was added?

Aforce of 240.0 n causes an object to accelerate at 3.2 m/s2. what is the mass of the object?

Currents in dc transmission lines can be 100 a or higher. some people are concerned that the electromagnetic fields from such lines near their homes could pose health dangers. for a line that has current 150 a and a height of 8.0 m above the ground, what magnetic field does the line produce at ground level? express your answer in teslas and as a percentage of the earth’s magnetic field, which is 0.50 g. is this value cause for worry?

A0.25 kg arrow is moving at 5 m/s and hits a 0.10 kg apple. the apple sticks to the arrow, and both move to the right together. what is their velocity?