CLO1 C2
b) A steel block with a mass of 30 g and a temperature of 100 °C was put into
container of water. The water temperature is 20 °C . If the temperature of the
mixture is 25°C, calculate the mass of water in the container (unit kg). Given
the specific heat capacity of water is 4200 J/kg°C and steel is 1400 J/kg°C.

Suppose that two tanks, 1 and 2, each with a large opening at the top, contain different liquids. a small hole is made in the side of each tank at the same depth 1.57 m below the liquid surface, but the hole in tank 2 has 2.49 times the cross-sectional area of the hole in tank 1. (a) what is the ratio ρ1/ρ2 of the densities of the liquids if the mass flow rate is the same for the two holes? (b) what is the ratio rv1/rv2 of the volume flow rates from the two tanks? (c) at one instant, the liquid in tank 1 is 14.9 cm above the hole. if the tanks are to have equal volume flow rates, what height above the hole must the liquid in tank 2 be just then?

What is the name of the perceived change in a sound wave’s frequency due to motion between the observer and the sound source?

Abumper car with a mass of 250 kg is traveling at a speed of 4 m/s. this bumper car collides and sticks to a second bumper car with a mass of 250 kg, which is initially at rest. what is the final speed of these two bumper cars after the collision, assuming they remain stuck together?