Water has a heat capacity of 4,184 J/kg*C. You have 2kg of water at a temperature of 98C. You want to raise the temperature to 100C. How much energy is needed to do this?

4,184J

16,736J

12,334J

9,445J

Why is symmetry important in an aircraft?

You place a fireplace poker into the coals of a hot fire (500 degrees C). The poker is made of steel, 50cm long with a diameter of 1.5cm.

A stone with a mass of 1.0 kg is tied to the end of a light string which keeps it moving in a circle with a constant speed of 4.0 m/s on a perfectly smooth horizontal tabletop. The radius of the path is 0.60 m.

Water enters the pump of a steam power plant as saturated liquid at 20 kPa at a rate of 45 kg/s and exits at MPa.

The masses and coordinates of four particles are as follows: 67 g, x = 3.0 cm, y = 3.0 cm; 30 g, x = 0, y = 6.0 cm; 41 g, x = - 4.5 cm, y = - 4.5 cm; 53 g, x = - 3.0 cm, y = 6.0 cm.

The doppler effect is the change in observed frequency due to

Which of the following is NOT a vector quantity? (A) Acceleration (B) Average velocity (C) Linear momentum (D) Potential energy (E) Force

Which of Newton's laws of motion is demonstrated by a hammer pounding a nail into a board

Heated air molecules in a hot air balloon soon carried thermal energy to the top of the balloon. this is an example of ... conduction. Convection. Radiation. Cooling.

When you are ice skating, to get started, you push your skate backwards on the ice and, as a result, begin to move forward. Which law of motion is being described in this scenario?